Arctic Sea Ice : Forum
Cryosphere => Permafrost => Topic started by: Tom_Mazanec on August 22, 2020, 03:20:18 PM
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Here is the new thread, Oren.
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Can naming conventions stay the same year to year. Please. It makes things so much easier.
Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
to
Northern Hemisphere Winter 2020-2021 Snowcover / Misc Obs
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Fixed.
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Yeah, I did this from my iPhone. Thanks for renaming.
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snow is accumulating on the ice ?
https://modeles.meteociel.fr/modeles/gfs/run/gfsnh-16-6.png?6 .. b.c.
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so they don't get lost again .. from tealight ..
Some time ago I posted regional snow extents, but the topic is kind of lost in the depth of the forum. After some minor improvements and adding two new regions in Asia I created a seperate webpage for the data. It makes it easier to analyse than several different forum posts.
On the snow-cover webpage, featuring snow maps I added the long term NOAA data since 1967. The low 200km resolution looks terrible compared to the new 24km, but the longer timespan is better to judge changes over time.
https://cryospherecomputing.tk/Snow-Cover
https://cryospherecomputing.tk/snow-regional
Report to moderator Logged
https://cryospherecomputing.tk/
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Lots of bright new snow has fallen over Axel Heiberg and the Ringnes Islands in the CAA.
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Yikes. I anticipate a record or near-record September advance in North America.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020082712/ecmwf_T850_namer_11.png)
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Yikes. I anticipate a record or near-record September advance in North America.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020082712/ecmwf_T850_namer_11.png)
I hold against it and if it's only for the sake of you saing "I expect" in relation to the fact that this forecasts like more or less most of your snow forecasts, just to make points that never are going realize, are and have been 10 days out over many years.
Using forecasts 10 days out is a nice tool to hype anything that never happens, exactly like i can tell that those forecasts almost never become true.
<Removed judgemental part. Clarified snow not general forecasts. O>
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I thought of bbr when I found a new paper - Severe Cold Winter in North America Linked to Bering Sea Ice Loss
I posted it here...
https://forum.arctic-sea-ice.net/index.php/topic,596.msg283603.html#msg283603
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Yikes. I anticipate a record or near-record September advance in North America.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020082712/ecmwf_T850_namer_11.png)
I hold against it and if it's only for the sake of you saing "I expect" in relation to the fact that this forecasts like more or less most of your forecasts, just to make points that never are going realize, are and have been 10 days out over many years.
Using forecasts 10 days out is a nice tool to hype anything that never happens, exactly like i can tell that those forecasts almost never become true.
My posts in the melt thread this season have been spot on. Your personal attack comes with no analysis and is not positive to generating analytical discourse.
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It's true that 10-day forecasts are not worth much, and that bbr has posted his share of them in the past. It's also true that their use has gone down sharply this year after re-registration. Igs and all, please avoid attacking users for past behavior, and for well-known behavior as well.
bbr - if you want to continue posting 10-day forecasts in the snow thread, that is less of an issue compared to the melt season thread where it's a big no no. However, I would strongly recommend following up 10 days later and reporting whether said expectations were fulfilled or not. This will greatly increase the value of such postings. In addition, maybe we will discover that for continental snow the 10-day is more reliable than for Arctic ocean weather.
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Yikes
The d8 forecast is pretty similar to what i posted before, but the d10 output....
(https://www.tropicaltidbits.com/analysis/models/gem/2020082912/gem_z500aNorm_nhem_41.png)
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020082912/ecmwf_z500aNorm_nhem_11.png)
It looks like snows should really begin in force imminently across the highest Rockies, the Mackenzie Range, Alaska, and much of the Canadian tundra.
The GFS offers a somewhat diff look (and is probably the most incorrect of them all) but is still frigid.
(https://www.tropicaltidbits.com/analysis/models/gfs/2020082918/gfs_z500aNorm_nhem_40.png)
I am beginning to become very concerned about potential agricultural impacts. The CMC is IMO the best for North America this time of year, EURO also good. But CMC is good at ice and snow dynamics, esp advance (IMO) which is why it is ideal for September / October / November (altho globally it may still underperform, it is designed for Canada, so.....)
(https://www.tropicaltidbits.com/analysis/models/gem/2020082912/gem_T2m_us_41.png)
Note the attached EURO snowfall from weather.us is through D10 and not just D10!
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Yikes. I anticipate a record or near-record September advance in North America.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020082712/ecmwf_T850_namer_11.png)
The 120hr forecast is remarkably consistent to the D10 forecast! And today's 12z EURO shows more potent Greenland airmasses mixing into the Arctic waiting to descend into North America as well, with more energy from recurving typhoons pumping a PIG ridge into Bering / Chukchi...
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020090112/ecmwf_T850_namer_6.png)
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PS,
Day 8, the 12z EURO has a major snowstorm in the lower Rockies, with snows into Denver and accumulations all the way into the TX panhandle. That would be fairly unprecedented for September 8th, I believe, Denver's earliest on record is actually about 4" on 9/3/1961, but its #2 was on 9/8/1962 and that was under an inch.
https://weather.us/model-charts/euro/colorado/acc-precipitation-snow-total/20200911-1200z.html
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Major blizzard now D5-6 in Rockies, amounts much higher, and over the more "normal" center of cold anomalies as of late (Montana and vicinity).
https://weather.us/model-charts/euro/2020090212/usa-west/acc-precipitation-snow-total/20200909-0000z.html
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So, it is worth noting --
The EURO has done WELL with cold forecasting in North America so far this week or two. The D10 forecast posted previously is going to come pretty close to verifying (not perfect, but the overall look was very accurate).
The EURO is now hinting at another vortex of Greenland air rotating into the Arctic and down into North America by day 10 or so. At D9 you can see it here still over Beaufort.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020090212/ecmwf_T850_namer_10.png)
You can also see the atmospheric trace of event #1 still extant in the Rockies. It is more obvious when looking at 2M temps, but the snow is so deep from the first blizzard that a good portion would PROBABLY survive til the next wave arrives (around the 13th or so?). This would accrete to what has already fallen in many areas, further dropping the snow line in the Rockies, and establishing a firm foothold for winter 2020-21 to take root on the North American continent.
Finally, this early and anomalous mid-latitude albedo event is likely going to evacuate an enormous amount of heat from the Pacific and Gulf of Mexico poleward in varying directions (IMO) and these evacuations will worsen as the anomaly grows in area and extent. Prepare for heat blasts into the Arctic from all directions, aided significantly by this potentially widespread appearance of snowfall around 40-45N in North America (which, interestingly, is proximate to my post in the ice age thread re: the Rockies matching the Himalayan anomaly.... but that is another subject).
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The 00z EURO was worse than the 12z, IMO. The Rockies blizzard in the D5 period is now forecast to produce 4"+ in Denver and 2"+ in Albuquerque. At 00z yday, amounts were substantial over highest Rockies, at 12z yday, amounts increased and spread to MT / WY, at 00z today, amounts increased further but switched from MT + WY + CO to CO + WY + NM (primarily).
New Mexico is..... SOUTH. I think such a September event would be unprecedented (or almost unprecedented, certainly with currently +oceanic heat content) for the Lower High Rockies.
https://weather.us/model-charts/euro/usa-west/acc-precipitation-snow-total/20200913-0000z.html
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Yikes for agriculture....
(https://www.tropicaltidbits.com/analysis/models/gem/2020090312/gem_T2m_us_29.png)
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Now creeping into the Plains. I am very worried about this September.
(https://www.tropicaltidbits.com/analysis/models/gfs/2020090412/gfs_asnow_us_26.png)
The 00z EURO might have been even worse.
https://weather.us/model-charts/euro/usa-west/acc-precipitation-snow-total/20200914-0000z.html
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Long range modeling is looking.... COLD
The Bering Sea connection has to be a major factor here but I guess this year maybe Laptev, ESS are aiding (???)
(https://www.tropicaltidbits.com/analysis/models/gem/2020090412/gem_z500aNorm_nhem_41.png)
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020090412/ecmwf_z500aNorm_nhem_10.png)
All the polar air keeps draining into North America, but by the end of the period it is also happening again over Kamchatka and NE Siberia. Meanwhile, it looks like the advected heat from the Rockies blizzard (now D4) arrives on the ATL front by day 8-10 on the 12z CMC, and accompanies a GAAC that is almost 1050MB (!!!). The extreme WARMTH dominates the entirety of the CAB by D10 and for mid-September, that would be very impressive, though it is Day 10 and the CMC.
I do think with the Rockies event now drawing near, we can consider such a scenario more LIKELY than it would be if depicted otherwise.
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The next major Rockies snow event arrives D10 on the North Slope of the Yukon / NWT. Wow. I think this will also end up more impressive than modeled and could also possibly arrive sooner. This would probably be a Rockies storm by D12ish.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020090412/ecmwf_T850_namer_11.png)
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As depicted, I would now call the upcoming event "unprecedented" in its scope, depth, and duration for areas impacted given the time of year. We are now seeing snows forecast to spread well into the High Plains, all the way to the middle of Nebraska and Kansas...
(https://www.tropicaltidbits.com/analysis/models/namconus/2020090612/namconus_asnow_us_29.png)
(https://www.tropicaltidbits.com/analysis/models/gfs/2020090612/gfs_asnow_us_20.png)
(https://www.tropicaltidbits.com/analysis/models/gfsp/2020090600/gfsp_asnow_us_25.png)
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The CMC shows major areas of >32F daytime temps developing by D10 across AK, the NW Territories, Yukon, and Quebec. As well as parts of the Shield and the elevated Rockies. Snowfalls by D10 are overspreading increasingly broad areas of North America though their duration remains tenuous outside of areas of greatest depth and elevation (for now).
(https://www.tropicaltidbits.com/analysis/models/gem/2020090612/gem_asnow_namer_40.png)
I think the EURO is shunting too much cold towards Siberia in the extended and it is probably going to fall into the Rockies. We will see if it adjusts but it is also cold along North Facing-slopes of the NW continental areas, as well as Quebec and the Shield.
With the impending airmass around 9/15 looking to be substantially below 32F even during daytime, if it arrives overtop the Rockies a few days thereafter, the snows could be even larger than round 1, and much more geographically uniform (i.e. across the entire High Plains and maybe the Upper Midwest). We will see what happens but I think there is a good chance North America sees one of its snowiest Septembers ever.
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GFS says its damn cold in that patch of the USA this morning, but by Saturday.....
Meanwhile still plenty of warmth over most of North America.
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While some snows will fall over Canada through D10, melting in some spots and starting to stick in favored elevations, the big story today is an event shown on the 12z EURO around D8-10. Snows begin in Maine and New England by D10 on the NW side of the phasing hurricane / polar vortex and it is backing into the coast at that hour.
The solution will probably disappear, but the EURO has a knack for major cyclonic events in this season (it was the first to show Sandy) so it will be interesting to watch its evolution over the next few days and this may bear watching.
(https://www.tropicaltidbits.com/analysis/models/ecmwf/2020091212/ecmwf_T850_us_11.png)
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72F in Denver as I type so that snow melted rather quickly. There was one disaster as a result of the freeze and snow. Millions of dollars of marijuana crops were destroyed.
https://mjbizdaily.com/early-freeze-in-colorado-could-cost-marijuana-hemp-growers-millions-in-losses/
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.. while those in Mendocino , California go up in smoke ...
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https://ccin.ca/ccw/snow/current
North America - the snow came, it melted. It does that in September.
Eurasia - almost zero new snow.
Early days - climate scientists suggest a long-term trend of later snow and more of it.
And a winter Al Nina is supposed to mean a cold North America - at least above 40? 45? 50? North.
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Through D10 modeling is now showing major SWE accreting in elevated areas of Quebec as well as the Rockies and Alaska. By D10, many models are now showing extreme 500MB blocking developing across much of the Arctic, centered atop the greatest oceanic heat anomalies derivative of the melt season. This is extremely concerning, IMO, and while extended guidance from the GFS posted below *should not be taken at face value* I think that combined with the looks being printed by ECMWF / CMC, alarm bells are ringing for possible anomalous snowfalls and severe October cold spells in the mid-latitudes.
(https://www.tropicaltidbits.com/analysis/models/gfs/2020092518/gfs_z500aNorm_nhem_46.png)
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So far this year's snowfall is more in Eurasia than North America, where snowfall is very much at average.
But it is very early days as yet.
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Day 277 compared with last year. (needs a click)
Very little yet in eastern Siberia.
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The snowfall response this year, surprisingly and contrary to my thoughts, has so far been anemic -- or it had been before about yesterday. Looks like accretion and spread of the snowpack begins substantially over the next week over both Eurasia and North America.
I guess the record warm Laptev et al have overwhelmed the Eurasian snowfall response until this point (?) due to high latitude blocking? But perhaps as the snowfalls actually begin the depths will accrete more than normal and do so quite rapidly, who knows!
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How average can you get? https://cryospherecomputing.tk/ from Nico Sun
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Welp, here we are, the cascade is happening in force again it seems.
(https://drive.google.com/uc?id=1WmpWVrVyk3oYqAezG3c16lPq-jyJpvSx&export=download)
North America is up to +2SD suddenly and looks like it should end the month at a record high (IMO).
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How average can you get? https://cryospherecomputing.tk/ from Nico Sun
Until it's not average any more - at least in North America.
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October might end at a massive all-time record for North America. The animated Canuck maps are a day ahead of the graphs. The uptick today was again.... absolutely insane, and occurring across MANY of the elevated areas of the continent.
https://weather.gc.ca/saisons/animation_e.html?id=month&bc=sea
Winter is most definitely here.
(https://hprcc.unl.edu/products/maps/acis/7dTMAXDeptUS.png)
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Very much not average. Record breaking cold across the center of the U.S. with a lot of snow and ice storms as far south as Oklahoma. Miserable weather in Chicago with lows around 0C.
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Very much not average. Record breaking cold across the center of the U.S. with a lot of snow and ice storms as far south as Oklahoma. Miserable weather in Chicago with lows around 0C.
This is insane.
(https://ccin.ca/home/sites/default/files/snow/snow_tracker/na_sce.png)
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If the winter weather continues for another week, it will suppress the vote a little. On one hand, 'they are used to it'; on the other, 'it's early.' Several of the most affected states have competitive federal office races. There will also be competitive state and local offices, and some 'interesting' ballot initiatives (https://ballotpedia.org/2020_ballot_measures).
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winter will have forgotten it's visit to the states by election day ...
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The positive snow anomaly in North America of 4.430 million km2 is very close to the record anomaly. On 11th and 12th October 2009 had an anomaly of +4.533 million and +4.715 million respectively. The only other close year was 2014 with +3.956 million on November 15th.
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winter will have forgotten it's visit to the states by election day ...
In the lower 48 snow starts to melt tomorrow and Nov 3rd looks like a really pleasant day
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Please don't go OT re elections.
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The positive snow anomaly in North America of 4.430 million km2 is very close to the record anomaly. On 11th and 12th October 2009 had an anomaly of +4.533 million and +4.715 million respectively. The only other close year was 2014 with +3.956 million on November 15th.
Did we pass 2009's anomaly today? The numbers are up again... we may have a new record here!
It should be noted 09-10 and 14-15 were both El Nino winters (moderate, and weak). We are in Nina-ish conditions now.
It should also be noted that the NHEM snow anomaly (+3.781M KM^2) is now larger than the sea ice deficit (-2.1M KM^2). By a decent margin, to boot. Who says the Earth-climate-system doesn't have built in resiliency measures....? It just so happens that the resiliency of the planet comes at the cost of most of our civilization. Oh well!
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The freshwater flux is now well underway in North America and I would say the melting of this extremely anomalous event is giving us our first meltwater pulse of the season. Though it is not substantial compared to the spring melt it is still an important process in lowering ambient temperatures of rivers, lakes, and adjacent saltwater bodies when runoff does arrive. SSTs are now cooling rapidly in the Gulf of St. Lawrence and parts of Hudson Bay, with shore ice also forming along much of Hudson Bay.
Given the extended forecast I anticipate a relatively early Hudson refreeze this year with most of the Bay frozen by 11/20 - 12/1. I wonder how this will act in concordance with the latest-ever-open areas of the Siberian-adjacent seas re: atmospheric impacts come December and onwards (and also in sync with what will probably be +SWE and +SCE anomalies).
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Central Park and the rest of the reporting stations in NYC recorded a trace of snow yesterday, setting the record for the shortest length of time between measurable snowfalls, coming on the heels of our last T on May 9th. Five months, and three weeks. !
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What goes very impressively up may go as equally impressively down.
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While SCE is only now stabilizing, SWE rebound is already well underway and it dipped much less (relatively). This shows how potent albedo can be as an insolation modifier early / late in the winter season -- it takes barely any relative precipitation to cover a HUGE continental area to massive deflection of proportional insolation. Even if these incursions of snowfall are short-lived for the time being, their scale makes them quite effective at dissipating sunlight (and heat).
Simultaneously, their OCCURRENCE is a dissipation of heat (from the Arctic Ocean) so they are doubly advantageous. Or perhaps even more efficacious than Arctic Sea Ice at resolving +OHC when the sea ice peels back even further. Oh dear. Let's hope not.
(https://ccin.ca/home/sites/default/files/snow/snow_tracker/na_swe.png)
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Also, if the EURO is correct it looks like Foxe Basin will be totally iced over by D10 and much of Hudson will be following suit at a rapid pace. There is a chance most of Hudson Bay will ice by 11/15-20, which would be very early. 11/25 is more reasonable which is still 1980s ish.
This would probably anchor a -500MB area in North America accompanied by associated negative temp anomalies, I think this would also advect a major amount of heat into both PAC and ATL fronts but esp the ATL fronts as Baffin is also icing over very quickly while Laptev, Kara, and Barentz are not. They will probably bear the brunt of poleward heat transport derivative of the continental and sea ice anomalies impending in aforementioned regions (IMO) as these anomalies are upwind of an Atlantic Ocean that has a LOT of heat to send poleward.
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What goes very impressively up may go as equally impressively down.
So far not quite so impressively down...
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Also, if the EURO is correct it looks like Foxe Basin will be totally iced over by D10 and much of Hudson will be following suit at a rapid pace. There is a chance most of Hudson Bay will ice by 11/15-20, which would be very early. 11/25 is more reasonable which is still 1980s ish.
If anything, Hudson ice is actually late this year, so I'll take the opposite side of the bet. UH AMSR2 shows virtually zero ice area where in quite a few previous years it reached 50k-100k km2.
I assume you plan to revisit this forecast when it comes due?
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Also, if the EURO is correct it looks like Foxe Basin will be totally iced over by D10 and much of Hudson will be following suit at a rapid pace. There is a chance most of Hudson Bay will ice by 11/15-20, which would be very early. 11/25 is more reasonable which is still 1980s ish.
If anything, Hudson ice is actually late this year, so I'll take the opposite side of the bet. UH AMSR2 shows virtually zero ice area where in quite a few previous years it reached 50k-100k km2.
I assume you plan to revisit this forecast when it comes due?
The Canucks are more accurate there has been lots of cloud interference /
(https://ice-glaces.ec.gc.ca/prods/WIS54CT/20201102180000_WIS54CT_0011304996.gif)
It is going to be advancing rapidly next few days it is not obvious yet but wait til end of month and compare, maybe I'm wrong, we shall see.
(https://ice-glaces.ec.gc.ca/prods/WIS54DPTCT/20201102180000_WIS54DPTCT_0011305087.gif)
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The meteo people tell us that Al Nina years are associated with a cold Canada.
A recent science paper claims an association between low Bering Sea winter ice and a cold Canada.
Environment Canada has a forecast of a pretty cold November for much of Canada
An early freeze of Hudson Bay by a few days is very possible, but so what? Hudson Bay has pretty much ignored AGW so far.
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Snow extent is crashing, and a continued warm week ahead is forecasted for North America and Eastern Europe/Western Siberia. NH Snow extent anomaly is already -1.8 million km^2 according to Cryosphere Computing, and bound to crash further. That's some additional albedo feedback right there that should postpone the onset of deep winter cold for much of the arctic.
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NH Snow extent anomaly now (11/5/2020) -2.392 million km^2 according to Cryosphere Computing. It's a bit surprising considering all the open water in the Arctic seas, but it's just too warm in North America and Eastern Europe / Western Siberia for precipitation to fall as snow quite yet.
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A little bit of a dip today back to "only" a -2.1 million km^2 anomaly for NH snow cover extent.
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NH Snow extent anomaly now (11/7/2020) -2.987 million km^2 according to Cryosphere Computing.
Weather is not the same as climate, but if re-glaciation in the northern hemisphere is indeed going to happen as per bbr's predictions (doubtful, in my opinion), it looks like it won't be a straight trend without notable reverses or exceptions...
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Just to mention that the reglaciation issue is not to be mentioned or discussed, or goaded. It is wrong and does not need discussion (except in one designated thread which did not find much interest).
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The climate scientists tell us that global heating means that snowfall will be later starting up in lower latitudes but overall there is going to be more of it.
November 8th data & map supports that - especially Europe & Western Siberia.
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NH Snow extent anomaly now (11/8/2020) -3.184 million km^2 according to Cryosphere Computing.
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Some decent snowfalls in the upper Midwestern U.S. and around the Ural region of Russia, but NH snow extent anomaly still (11/11/2020) -1.842 million km^2 according to Cryosphere Computing.
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11/12/2020 NH snow extent anomaly according to Cryosphere Computing: -2.191 million km^2.
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Just to mention that the reglaciation issue is not to be mentioned or discussed, or goaded. It is wrong and does not need discussion (except in one designated thread which did not find much interest).
Its dangerous to say that is it "wrong". In the 60s, if you mentioned "global warming" youd have been told you were wrong.
I understand its banned because it is pretty wild, but that doesnt mean its wrong.
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so bbr has had the canadian ice sheet growing for the last 6 years .. just go back to 2016 freezing season or the like and read ad nauseum .. we need little refreshment annually .
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so bbr has had the canadian ice sheet growing for the last 6 years .. just go back to 2016 freezing season or the like and read ad nauseum .. we need little refreshment annually .
Record North American extent and volume are dismissed because posters here don't know the difference between hemispheres and continents.
My reply is moderated and in red.
So why should I keep participating here.
(https://ccin.ca/home/sites/default/files/snow/snow_tracker/na_sce.png)
(https://ccin.ca/home/sites/default/files/snow/snow_tracker/na_swe.png)
And you just attacked me as well. I bothered logging back in to say this but maybe next time I won't, I am pretty over this.
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Just to mention that the reglaciation issue is not to be mentioned or discussed, or goaded. It is wrong and does not need discussion (except in one designated thread which did not find much interest).
Its dangerous to say that is it "wrong". In the 60s, if you mentioned "global warming" youd have been told you were wrong.
I understand its banned because it is pretty wild, but that doesnt mean its wrong.
OK. It's just unsupported completely by any relevant science.
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His theory and the actual science it is derived from are two different things. Discussing the actual science is ok.
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Folks, reglaciation is to be discussed only in the designated thread. If anyone has trouble finding it I can post a link later. If anyone wants to explore the science or lack thereof, feel free to do so over there.
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Record NA snowfall is certainly welcome to be discussed here.
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11/15/2020 NH snow extent anomaly according to Cryosphere Computing: -1.592 million km^2.
European Russia FINALLY getting some snow, but some retreat in east Asia and North America.
Kids decades from now (or even right now) are going to read about the Kronstadt rebellion during the Russian Civil War, and scratch their heads over how the Red Army was able to send cavalry over the frozen ice in March from Petrograd to the Kronstadt naval base, unless it is explicitly explained to them that the climate used to be different. Or likewise, they are going to be scratching their heads over why Operation Typhoon in November of 1941 was so difficult meteorologically for the German Wehrmacht.
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Or likewise, they are going to be scratching their heads over why Operation Typhoon in November of 1941 was so difficult meteorologically for the German Wehrmacht.
...and they will be told that it was unseasonally, unexpectedly unbelievably cold during 1941 Nov and Dec in Eastern Europe and Russia as shown in the attachement. It was one of the coldest winters of the century. It was 4-5 C colder in November and December than the average of that era! Even October was 2-3 C colder.
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North America snow @ 18 Nov from https://ccin.ca/ccw/snow/current
SCE about 1 SD above average,
SWE very much above average.
which seems to be the patttern for early winter in recent years.
Mind you, if the centre and north of North America gets really cold (due to Al Nina and low winter sea ice in the Bering) perhaps it could get too cold for snow.
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For the record, total Northern Hemisphere snow extent is still below average. According to Cryosphere Computing, for 11/18/20 it is -0.582 million km^2.
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For the first time in a while this year, total Northern Hemisphere snow extent is going significantly above average. According to Cryosphere Computing, for 11/20/20 it is +0.510 million km^2.
Total combined northern hemisphere snow + ice extent is still barely below average, but most of that below-average ice extent is in the Kara Sea where the sun isn't shining anyways, so now finally the winter snow is getting some positive albedo feedback to deepen cold temperatures and snow extent further.
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11/22/2020 NH snow extent anomaly according to Cryosphere Computing: +1.236 million km^2.
Quite a burst of snowfall in Eurasia!
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A major snowstorm is developing in the U.S. Expect big changes next week.