More unprecedented severe weather is unfolding in the USA as we speak.
The warmth racing north through areas to the east of the Rockies likely to break many December records. We are talking about 30-40°F warmer than average.
The warmth is only a part of the story...
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The temperature & contrast is incredible. Watch how the warm/tropical feed is blasted north and east (all the way into Canada) as low pressure ejects from the Rockies.
This is a seriously fast-moving system. A top-end wind storm is unfolding...
As the low pressure rapidly deepens, extreme wind gusts will quickly spread from the Rockies into the mid-west.
Dangerous conditions expected with 60-80 mph gusts widely, but locally 100 mph possible. Wind damage, blowing dust & fire danger are among the hazards.
Heart-wrenching news coming from the USA as extreme long-track & violent tornado leaves a path of devastation crossing *four* states.
A particularly severe setup for December fuelled by insane warmth & moisture transport under a vigorous short-wave trough.
This latest pulse of heat from the south is breaking December heat records, more to come on that.
The unfortunate combination with strong upper-level winds and high instability throughout the atmosphere meant the atmosphere was 'perfect' for extreme thunderstorms & tornadoes.
The pulse of heat from the tropics is truly remarkable. We are looking at some places east of the Rockies recording temperature values 15-20°C (20-35°F) above seasonal average.