Discover and read the best of Twitter Threads about #MTwx
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NEW: A NOTAM was placed with flight restrictions in north central Montana calling it a "National Defense Airspace." This is until further notice, issued at 00:20z (06:20 p.m. central time) 
A USAF Stratotanker is in the area doing laps. #BalloonGate continued?
Statement from the FAA:
Last week bitterly cold air developed over east central Siberia, the likes of which we haven't seen in 40 years this early in December. It was chronicled very well by @ThierryGooseBC on December 6.
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Ever since then the weather prediction models have been showing some crazy, downright silly numbers across Canada & the United States. I'm talking record high Mean Sea Level Pressure, both for December & ALL TIME. Here are those MSLP records from @NWSWPC researchers.
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For those not used to reading these maps, the values shown are the last three digits of the MSLP. For example, in #Missoula the all-time highest surface pressure observed was 1059.9mb on January 1, 1979. The record for December was 1054.5mb on #ChristmasEve, 1983.
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You could write an entire meteorology textbook just based on the phenomena visible from this afternoon's wild satellite imagery looking down at the American West. (Thread) #CAwx #WAwx #ORwx #COwx #UTwx #MTwx #IDwx
Most prominent is incredibly strong early-season cold front plunging southward from Canada and currently stretching along a roughly east-west axis from Eastern Washington to North Dakota. Clouds are rapidly developing behind the front as cold air replaces a very hot airmass.
Next, there are numerous large wildfire smoke plumes visible in nearly every state not covered by clouds--including Washington, Oregon, California, Utah, Idaho, and Colorado. The total smoke volume is massive, and extends across most of the continental U.S.
