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Snow And Ice In The Northern Hemisphere 2017/18


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Nice to see all of Russia, Mongolia, Kazakhstan and all Northern Tibet white! It means north and central Eurasia getting very cold, 500 mb thickness heights falling north of the Himalayas - leading to strong Westerlies over the Himalayas and Pamirs so that these major mountain chains become a major sink for Westerly Atmospheric Angular Momentum. 

Scope this is for weaker Westerlies in higher latitudes and high-latitude blocking later in the Winter. 

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you used to be able to run a sequence for the last 30 days on the US National Ice Centre section the NOAA Website, but it's gone. So I've created a GIF of the last 7 days. I'll do one next week f

Absolutely love this thread. Certainly my favorite of the year. And for posterity, here is what we should be aiming for....

Well, it's that time of the year again, where we can all start turning our backs from summer, and start looking north and east towards the encroaching snows of Siberia.   Lets hope that this

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18 hours ago, Blessed Weather said:

Hum.... don't know what to make of this tweet.

 

I guess you already know, but Jason Furtado was a co-author on Cohen's original paper. I saw a less-than-friendly exchange on twitter between the two of them last year which suggested that they are no longer in agreement.

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Here is the latest snow and ice chart. The snow and ice are making very slow progress and any increases made is done at a very slow pace. I hope this will change soon and that there will be more improvements in the snow and ice.

 

cursnow_asiaeurope natice.noaa.gov Data Snow and Ice Europe and Asia Sunday January 14th 2018.gif

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14 minutes ago, Katrine Basso said:

The snow has made big increases and spreading further across Europe.  I hope this trend will continue.

 

cursnow_asiaeurope Snow and Ice Wednesday 17th January 2018.gif

With mild South Westerlies likely during next week I fear a major withdrawal of the snow line Eastwards.

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2 hours ago, mountain shadow said:

With mild South Westerlies likely during next week I fear a major withdrawal of the snow line Eastwards.

Yes, snow cover not looking good for Western Europe, although in compensation there's snow advance in Asia and North America over the next 8 days. A look at the latest GFS 7-day forecast 2M temperature anomaly for the Northern Hemisphere and Europe shows the warm up for our neck of the woods, but look at the incredible pool of cold air building in Eastern Europe:

NH 5a60c3925618f_GFS7DayTempAnomNH18Jan.thumb.png.230d78f17856a810f7145a27c94b616d.png Europe 5a60c3a455f67_GFS7DayTempAnomeurope18Jan.thumb.png.24426e8066080036d5231d32acb48377.png

Here's the GFS take on snow depth change NH and Europe over the next 8 days (to 26th Jan):

 

tempresult_xkh2.gif   tempresult_ynt4.gif

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In the past days there have been decreases of ice and snow. The very slow increases of snow and ice have started again. There will be more to come by the end of the week.

cursnow_asiaeurope Snow and Ice Chart Europe and Asia Sunday February 18th 2018.gif

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46 minutes ago, coram said:

Yes Katrine. The Baltic Sea could see big increases over the next couple of weeks.

Could see large areas of the Baltic frozen. It has frozen over completely 20 times since reliable records began in 1720, most recently in the infamous 1987 cold spell. More recently, floating ice was seen near Świnoujście in 2010, this a Polish seaside town just by the German border in the far south west of the Baltic, so the 'warmest' and last to freeze.

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14 minutes ago, Katrine Basso said:

I will be quite encouraging to see bigger increases of sea-cover in the Baltic.

It will be, I'm fascinated with oceanography myself. The Baltic has a very low salinity so freezes more easily too.

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On 20/02/2018 at 08:27, Seasonality said:

Could see large areas of the Baltic frozen. It has frozen over completely 20 times since reliable records began in 1720, most recently in the infamous 1987 cold spell. More recently, floating ice was seen near Świnoujście in 2010, this a Polish seaside town just by the German border in the far south west of the Baltic, so the 'warmest' and last to freeze.

Nearly froze over completely in February 2011. It's a good month when you can walk between Stockholm, Helsinki and Tallinn entirely over ice.

:ims2011055_asiaeurope.gif

Also found this, showing 1987 (1985 was also very good):

advanced-multipurpose-ice-breakers-of-ar

1981 is apparently what an average winter looks like for Baltic sea ice.

Edited by cheese
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