Arctic Blast This Week To Be Followed By Another Next Week As NAO, AO Go Neg

Written by on November 13, 2013 in United States of America with 0 Comments

Arctic air continues to blast south this evening and it sure has grabbed the attention of millions of shivering Eastern and Southerners. As the front has steamed through, we’ve seen rain change quickly to snow, gusts past 40 mph, thunder and lightning and temperature drops of 10+ degrees within just 1 hour. 24 hour drops have been in the order of 25 to 35 and in some causes 40 degrees.

We also saw record snowfall, albeit a trace in many areas stretching from Maine down to North Carolina.

This evening there are countless snow images being uploaded to twitter from North Carolina as the front crosses the mountains and pushes ever closer to the coast.

Here’s the current radar over North Carolina and you can clearly see the front with rain on it’s leading edge with backside snows. Note the moisture is limited but that’s an impressive front. According to TWC, Charlotte was up to 65 degrees earlier and is now down to 35 and will drop into the 20s tonight beneath clear skies.

Source: weather.com

Source: weather.com

Here was the lows from this morning.

Source: weather.com

Source: weather.com

Check out the 24 hour temperature change.

Source: weather.com

Source: weather.com

Coldest night across the greatest area tonight with 20s possible all the way to Florida! That’s more like a January night over the Southeast.

TWC forecasted lows

Source: weather.com

Source: weather.com

GFS forecasted lows

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Check out just how below normal these lows are!

Source: weather.com

Source: weather.com

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As you can see from the above chart, there is strong warming taking place on the northern periphery of the arctic high, here’s the current surface chart off the GFS which shows where the high is positioned.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Another Major Shot Of Arctic Air Next Week!

The high eventually pushes out into the Atlantic by the weekend with warmth BRIEFLY returning to the East. I say brief because models show another arctic blast coming down early and mid next week and yes there is a storm on the chart too.

Check this out by Monday.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

850mb temps.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Here’s the ECMWF which pretty much shows the same thing as the GFS.

Geopotential3250032hPa32and32Temperature32at3285032hPa_North32America_144

192 hr

Geopotential3250032hPa32and32Temperature32at3285032hPa_North32America_192

The models are all in agreement that blocking will develop next week the ridging over Alaska and Greenland linking up.

Check out the CFSv2 500mb height anomalies and you can see this week’s lack of blocking compared to next week. What a difference between week 1 and 2

wk1_wk2_20131111_z500

week 3 and 4 continues to show blocking.

wk3_wk4_20131111_z500

Sure enough the temperatures are colder over the Lower 48.

w 1-2

wk1_wk2_20131111_NAsfcT

3-4

wk3_wk4_20131111_NAsfcT

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