Thanks to a mid-winter depth trough vs a summer-like ridge, yesterday saw snow and sub-zero wind chills across Montana while at the same time cities in the East where enjoying their warmest February day on record.

AMAZING STUFF!

https://twitter.com/ericfisher/status/966091592313524224

A 590+dm in summer is strong and produce heat waves but in February, it’s just ridiculous.

In fact it’s record breaking.

https://twitter.com/wxbrad/status/966349859686178816

The result was 80s all the way to West Virginia!

At this time of year where there’s record warmth there’s often record cold somewhere

While this is the scene in New York…

this is Montana with biting sub-zero wind chills.

Record cold West delivers a record warm East when you’ve got a highly amplified pattern.

https://twitter.com/NWSMissoula/status/966020882933207043

https://twitter.com/NWSBayArea/status/966126815554260993

https://twitter.com/NWSSeattle/status/966293773805281280

https://twitter.com/NWSRiverton/status/965938093722390529

https://twitter.com/WeatherNation/status/966337310005460992

https://twitter.com/NWSBoulder/status/966291788234452992

This morning’s record -7 follows a record cold high of 13 in Denver yesterday.

https://twitter.com/AnnieSage/status/966166796117028865

In a day and a half, Denver dropped 72 degrees.

A lot of weather along the eastward progressing boundary just now separating summer from winter.

With powerful cold fronts separating extreme air masses come dramatic temp swings.

While in was winter on the north side of Oklahoma City yesterday it was still summer on the south side.

https://twitter.com/wxbrad/status/965939747007946752

https://twitter.com/NWSBoulder/status/966025197819133954