One is the strong potential for flash flooding across Arizona, New Mexico, Utah and much of Colorado Wednesday and Wednesday night. Local amounts to 3 inches will be likely in just a couple of hours and that's enough to cause flash flooding.
The storm system moves across the central U.S. Thursday with widespread rain from Kansas and Oklahoma northward. There will be a significant risk of severe thunderstorms across South Dakota, Nebraska, Iowa and Minnesota.
Cold air in Canada is becoming more widespread and getting ready to surge to the south.
Temperatures at 850mb are running -6C to -12C across northwest Canada and +3C over Alaska
These are the 850mb temperatures over northwest Canada and Alaska. They've dropped about 6C-9C just in the past two weeks. Some of that air will plummet southward across the eastern half of the U.S. in the next two weeks for the first widespread freeze over the area this fall. We've got the date pretty well nailed down for clients.
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