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Author Topic: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs  (Read 2826 times)

Niall Dollard

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Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« on: September 19, 2021, 02:02:42 PM »
A new thread for reporting/discussing NH snowcover as we enter the new snow "season".

I see there is now 20cm snow cover lying at Alert Nunavut. It has built up steadily there from the 5th September.

Nothing particularly unusual about this. Although it is looking like it will be snowier than usual. Precipitation total for the month so far is 20.1mm and with still plenty of days to go yet it's likely that the 1981-2010 normal total of 22.5mm will be exceeded.

Sebastian Jones

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #1 on: September 19, 2021, 08:25:49 PM »
Not record early (the 1992 post Pinatubo September record is unlikely to be matched in the foreseeable future), but snow is forecast this week:

Niall Dollard

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #2 on: October 09, 2021, 10:03:39 PM »
Last 7 days animation. Starting to fill in.

Needs a click.

The Walrus

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #3 on: October 10, 2021, 03:24:21 PM »
Last 7 days animation. Starting to fill in.

Needs a click.

Should really start to fill in this week with a major snowstorm hitting the Rockies.

Comradez

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #4 on: October 26, 2021, 02:14:46 PM »
So, funny thing...while sea ice grows back at a vigorous pace, northern hemisphere snow cover is extremely low for this date. 

As of 10/25/2021, NH snow extent anomaly is -3.200 million km^2 according to Cryosphere Computing. 

Does this matter at all?  Will the late albedo changes significantly delay the freeze-up of Hudson Bay? 

Shared Humanity

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #5 on: October 26, 2021, 05:06:51 PM »
So, funny thing...while sea ice grows back at a vigorous pace, northern hemisphere snow cover is extremely low for this date. 

As of 10/25/2021, NH snow extent anomaly is -3.200 million km^2 according to Cryosphere Computing. 

Does this matter at all?  Will the late albedo changes significantly delay the freeze-up of Hudson Bay?

You are certainly correct, especially for North America but I think it is way to early to think it will have an impact.

The Walrus

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #6 on: October 26, 2021, 05:13:23 PM »
Those numbers may change significantly with the major storm hitting the western U.S.

Brigantine

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #7 on: October 27, 2021, 03:15:08 AM »
So, funny thing...while sea ice grows back at a vigorous pace, northern hemisphere snow cover is extremely low for this date.

Hmm... the opposite of WACCy. These things tend to go together
« Last Edit: October 27, 2021, 03:21:29 AM by Brigantine »

Shared Humanity

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #8 on: October 27, 2021, 10:02:26 PM »
Those numbers may change significantly with the major storm hitting the western U.S.

I agree.

Comradez

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #9 on: October 30, 2021, 01:35:23 AM »
As of 10/28/2021, NH snow extent anomaly is -3.309 million km^2 according to Cryosphere Computing.

Comradez

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #10 on: October 30, 2021, 10:24:11 PM »
As of 10/29/2021, NH snow extent anomaly is -3.938 million km^2 according to Cryosphere Computing.

This is the largest anomaly I have witnessed so far.  How low will it go?  Will it crack -4 million km^2? 

And to what extent does this matter?  Albedo-wise, this is like having a -4 million km^2 anomaly at the beginning of February, in terms of how much sun there is hitting the snow-less ground.  I feel like a -4 million km^2 in early February would be kind of a big deal for the amount of extra heat absorbed...

FredBear

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #11 on: October 31, 2021, 02:36:13 AM »
As of 10/29/2021, NH snow extent anomaly is -3.938 million km^2 according to Cryosphere Computing.

This is the largest anomaly I have witnessed so far.  How low will it go?  Will it crack -4 million km^2? 

And to what extent does this matter?  Albedo-wise, this is like having a -4 million km^2 anomaly at the beginning of February, in terms of how much sun there is hitting the snow-less ground.  I feel like a -4 million km^2 in early February would be kind of a big deal for the amount of extra heat absorbed...
It is likely to be the reverse - there will be more radiation from the surface into a winter sky without a snow blanket (+ higher air temperatures?).

Comradez

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #12 on: October 31, 2021, 02:44:01 AM »
Is that true?  How much heat flux is coming out of the ground in areas that are largely permafrosted?  Not much, I would think.  And how much of that heat flux is obstructed by a blanket of snow?  And how does that compare to the extra heat absorbed from the sun, even with 8 hours of sunlight per day at like 15 degrees angle?

FredBear

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #13 on: October 31, 2021, 10:59:44 AM »
Where the surface of the permafrost has warmed (melted?) it should help get heat back out, only a small effect for a short time but over a vast area? It might make a big difference to the stability of the land surface??

Comradez

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #14 on: October 31, 2021, 04:31:03 PM »
As of 10/30/2021, NH snow extent anomaly is -4.249 million km^2 according to Cryosphere Computing.

Niall Dollard

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #15 on: November 04, 2021, 11:28:31 PM »
And four days later the nh snow cover anomaly (courtesy Nico Sun) is down to -947,000 km2, mostly due to to snowfalls in central Siberia, northern Ontario and northern Quebec.

Positive temperatures over next few days likely will ensure the Ontario snow won't last long (for now). 

be cause

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #16 on: November 06, 2021, 04:13:38 PM »
meanwhile , to celebrate COPOUT26 , the last speck of snow in Scotland melted out . This once a century occurrence has happened 3 times in the last 5 years .
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 + 2 = 2021 + 1 .. you gotta laugh .. :)

Sebastian Jones

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #17 on: November 08, 2021, 01:52:14 AM »
meanwhile , to celebrate COPOUT26 , the last speck of snow in Scotland melted out . This once a century occurrence has happened 3 times in the last 5 years .


I keep thinking about this last patch of semi-firn in Scotland. That it lasts until November before melting is so sad. November is supposed to be almost winter. When I was small and living in England, we had a saying that went: "If there is ice in November to bear a duck, February will be all mire and muck." Not to say that it is true or anything, but it does speak to how November used to be cold. The fag end of autumn, I think John LeCarre called it. My school took a trip that included a hike up Ben Nevis one May, and it was most certainly still winter at the peak. Please excuse the solastalgia. On the bright side, and more on topic, there is finally enough snow here that I was able to get the dogs out today for a run, both on the toboggan and the skis. Happy huskies!

gerontocrat

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #18 on: November 08, 2021, 01:38:44 PM »
Images from Nico Sun. https://cryospherecomputing.tk/

A lot of snow in Asia

click images to enlarge
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FredBear

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #19 on: November 08, 2021, 03:30:18 PM »
 Extra snow not so much in polar areas  .    .    . but quite far south (circa Chinese & Korean latitudes?).

Shared Humanity

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #20 on: November 08, 2021, 06:27:30 PM »
Extra snow not so much in polar areas  .    .    . but quite far south (circa Chinese & Korean latitudes?).

Noticed this as well. Have no idea the reason or whether it is unusual.

Niall Dollard

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #21 on: November 08, 2021, 11:58:35 PM »
Extra snow not so much in polar areas  .    .    .

But practically all the polar areas already have snow as per climatology so no anomaly. It's at the lower edges you see the positive and negative anomalies.

Rutgers Snow Lab just puts it Blue or Red or White (no anomaly).

FredBear

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #22 on: November 09, 2021, 06:47:32 AM »
Extra snow not so much in polar areas  .    .    .

But practically all the polar areas already have snow as per climatology so no anomaly. It's at the lower edges you see the positive and negative anomalies.

Rutgers Snow Lab just puts it Blue or Red or White (no anomaly).

Anomalies can be early indicators of change (e.g. slow ice formation on "warm"seas) but at this stage in the season variations in snow are just likely to depend on which way the wind has blown    .     .     .    (earlier the snow was a bit slow in the arctic indicating possible warmth?).

Feeltheburn

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #23 on: November 26, 2021, 06:47:27 AM »
In stark contrast to other recent years northern hemisphere snow cover is very low at the moment, especially in North America:

https://GreatWhiteCon.info/2021/10/facts-about-the-arctic-in-november-2021/#Nov-03

According to this site, snow in the northern hemisphere has been above average in area and water content since the beginning of October:

https://www.ccin.ca/index.php/ccw/snow/current
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The Walrus

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #24 on: November 26, 2021, 06:10:16 PM »
In stark contrast to other recent years northern hemisphere snow cover is very low at the moment, especially in North America:

https://GreatWhiteCon.info/2021/10/facts-about-the-arctic-in-november-2021/#Nov-03

According to this site, snow in the northern hemisphere has been above average in area and water content since the beginning of October:

https://www.ccin.ca/index.php/ccw/snow/current

Yes, the increased snow cover in Eurasia more than compensates for decreases elsewhere.

oren

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #25 on: November 29, 2021, 06:00:42 PM »
Snow situation according to NOAA, from Cryosphere Computing.

The Walrus

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Re: Northern Hemisphere Winter 2021-2022 Snowcover / Misc Obs
« Reply #26 on: December 02, 2021, 03:00:30 PM »
<You keep posting material from soft denial websites. Not on my watch, and not in my section. Reduces my willingness to pass through other more innocent posts made by you.
Note: not sure what is worse, that you are aware of it or are unaware of it. O>
« Last Edit: December 05, 2021, 08:38:45 PM by oren »