One could argue that the origins of the current US arctic outbreak can be linked back to last month’s explosive NH snow cover expansion and consequential stratospheric warming over top.
The warming continues to put pressure on the polar vortex. Notice in the below chart the strong warming over Eurasia which actually shifts the vortex nearly all the way to Scandinavia by 384 hours. There’s a lot going on in the upper reaches of our atmosphere which suggests we have a lot to contend with this winter not just over the US but hemisphere. This could be a real sign of bigger things coming once we enter winter proper. hint: full-scale sudden stratospheric warming with completely collapse of the vortex down into the tropopause.
Credit: Michael Ventrice
With the current push of major cold south, US snow cover has jumped 19.5% from just 0.3% last month. This rise has came predominantly within the last 36 hours.
Behind the arctic front, temps have crashed as much as 40-60 degrees inside 24 hours.
Credit: weather.com
The most impressive drop I’ve seen was at Amarillo, TX which saw a drop of 63 degrees within 15 hours and 5 minutes… 82 to 19 degrees!
Credit: weather.com
Credit: weather.com
COVER IMAGE: Credit, WeatherBug
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Temps fell to at least -22 in Lewis and Clarke National Forest, MT this morning.
Current view of the morning commute in Minneapolis.
Marshfield, WI earlier this morning.
Credit: WeatherBug
GFS has a 1052mb surface high over Wyoming tomorrow morning…
Credit: AccuWeather Pro
As a result, it’s got -40 in NW Wyoming tomorrow morning!
Cold will ease from the extremes we’re seeing over the Rockies over the next 5 days but records will fall further east…
Rockies and Plains 5 day mean temps/departures from normal are impressive!
Prepare for a cold 2 weeks. This outbreak will rival November’s worst!
SEE VIDEO FOR MORE!
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