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Author Topic: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs  (Read 10942 times)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #100 on: December 03, 2019, 04:19:08 PM »
Anyone would think winter had arrived.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #101 on: December 05, 2019, 07:21:51 PM »
https://ccin.ca/ccw/snow/current - 4 Dec

But how much melt before the next blast ?
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #102 on: December 09, 2019, 11:58:03 AM »
https://ccin.ca/ccw/snow/current - 4 Dec

Qu: But how much melt before the next blast ?
_____________________________
https://ccin.ca/ccw/snow/current - 8 Dec

A:  Quite a lot (North America and Eurasia)

My speculation that belongs to me (mostly stolen from real scientists) - for North America especially ↠↠
Global heating ↠ Weak Polar Vortex
↠ ↠ large slow-moving Rossby Waves 
↠ ↠ influx of cold & snow from the North
↠ ↠ followed by influx of warmth from the South

= record snowfall & storms followed by strong melt = overall average snow cover.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Shared Humanity

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #103 on: December 09, 2019, 10:42:10 PM »
47F and raining in Chicago.

Shared Humanity

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #104 on: December 15, 2019, 03:07:30 PM »
Generally, over recent years, snow cover extent has lagged snow water equivalent in the NH.

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

If we look at the current map for snow depth anomalies, it is clear what is happening. Positive anomalies are generally occurring at higher elevations and latitudes while negative anomalies are occurring at lower elevations and latitudes. Kind of expected, IMHO.


gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #105 on: December 18, 2019, 02:37:34 PM »
https://ccin.ca/ccw/snow/current as at 17 December

New snow in North America, but wunderground.com say temperatures will rise in the US Lower 48. A thaw coming?

In Eurasia only modest new snowfall.

Overall snow cover extent for the Northern Hemisphere very much average.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #106 on: December 23, 2019, 06:12:10 PM »
https://ccin.ca/ccw/snow/current as at 22 December

Interesting contrast between Snow Cover Extent (SCE) and Snow Water Equivalent (SWE).

In North America (NA) SCE is a average after a thaw at low latitudes, relatively low compared with the last 2 years. But SWE is above average.

Eurasia (EU) SCE is very much below average, mainly due to an absence of snow cover in Europe. But SWE is well very much above average.

In other words, where there is snow its thickness and therefore mass is very much above average.

We are also getting close to the maxima of SCE and SWE for the northern hemisphere, though from now to March or even April large snowfalls can happen.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #107 on: January 04, 2020, 08:26:48 PM »
https://ccin.ca/ccw/snow/current Snow Cover Extent and Mass as at 3 January 2020

The situation as described below on 22 December has not changed. i.e. Snow Cover Extent at or below average, Snow Water Equivalent well above average, meaning average snow thickness (where it is lying) very much above average.

https://ccin.ca/ccw/snow/current as at 22 December

Interesting contrast between Snow Cover Extent (SCE) and Snow Water Equivalent (SWE).

In North America (NA) SCE is at average after a thaw at low latitudes, relatively low compared with the last 2 years. But SWE is above average.

Eurasia (EU) SCE is very much below average, mainly due to an absence of snow cover in Europe. But SWE is well very much above average.

In other words, where there is snow its thickness and therefore mass is very much above average.

From now to March or even April large snowfalls can happen.

ps: Snowfall on Greenland is also a bit below average.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Janne Hietalahti

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #108 on: January 17, 2020, 09:44:21 AM »
Im from Finland and I was amazed about inaccuracies on snow cover data. We have 1/4 country, about 80 000 km^2 snow free, and in nooa and rutgers it seem all snow here.

Shared Humanity

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #109 on: January 17, 2020, 03:21:43 PM »
The Snow Cover Extent and Snow Water Equivalent metrics are getting a little crazy.

(I miss having bbr2314 here saying it is heralding a new ice age.)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #110 on: January 17, 2020, 04:23:37 PM »
And so it goes on
https://ccin.ca/ccw/snow/current Snow Cover Extent and Mass as at 16 January 2020

The situation as described in the quotes below has not really changed. i.e. Snow Cover Extent at or below average, Snow Water Equivalent well above average, meaning average snow thickness (where it is lying) very much above average.

The snow drought in much of Europe is impressive (see next post)
Snowfall on Greenland is somewhat below average (see next post)

https://ccin.ca/ccw/snow/current Snow Cover Extent and Mass as at 3 January 2020

The situation as described below on 22 December has not changed. i.e. Snow Cover Extent at or below average, Snow Water Equivalent well above average, meaning average snow thickness (where it is lying) very much above average.

https://ccin.ca/ccw/snow/current as at 22 December

Interesting contrast between Snow Cover Extent (SCE) and Snow Water Equivalent (SWE).

In North America (NA) SCE is at average after a thaw at low latitudes, relatively low compared with the last 2 years. But SWE is above average.

Eurasia (EU) SCE is very much below average, mainly due to an absence of snow cover in Europe. But SWE is well very much above average.

In other words, where there is snow its thickness and therefore mass is very much above average.

From now to March or even April large snowfalls can happen.

ps: Snowfall on Greenland is also a bit below average.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #111 on: January 17, 2020, 04:24:55 PM »
The snow drought in much of Europe is impressive
Snowfall on Greenland is somewhat below average
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

SimonF92

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Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« Reply #112 on: January 17, 2020, 04:40:24 PM »
An interesting paper on modelling changes in Arctic precipitation over time

https://www.nature.com/articles/s41598-018-34450-3