Fall 2018;Northern Hemisphere (tornadoes, history, best, snow)
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A brief respite today and tomorrow for Edmonton then it's back to the cold weather pattern starting Wednesday. There seems to be good model agreement for sustained cold weather for the north central plains for the foreseeable future. How much cold air will spill south?
Northwest flow will move in through this evening behind a low pressure system over central Montana moving out of our area to the east. At least some residual shower activity should persist into the overnight, with an isolated rumble of thunder or two possible as well through early this evening.
Drier conditions are expected Tuesday and Wednesday with temperatures rebounding to around seasonal averages by Wednesday afternoon. A colder airmass pushes south into the region Thursday with a disturbance moving along a stationary front just along and west of the Continental Divide. This will support the development of rain and mountain snow along the Northern Rockies and adjacent areas sometime between late Wednesday night and early Friday. Behind this system, upper level troughing looks to remain largely in place across the forecast through the weekend as ridging in the NE Pacific amplifies north through AK with troughing downstream across North America. While there is better model agreement and thus higher confidence in temperatures 10-20 degrees below seasonal averages late this week into the weekend, there is still a great deal of uncertainty with regard to timing and amounts of precipitation Thursday through Sunday as models continue to differ with amount and timing of Pacific energy and moisture undercutting the offshore ridge and tracking into the Pacific NW and Northern Rockies.
CC/Hoenisch
I predict that the fall, winter, and spring seasons will be more volatile than normal and will set precipitation records in spots in the eastern two thirds of the lower 48 States.
Enjoy ringing hot weather for weeks on end. I told ya guys weeks ago that high is dead locked and i won't see any cool weather until Dec if even then. Gonna be a super warm and dry winter for may areas.
I predict that the fall, winter, and spring seasons will be more volatile than normal and will set precipitation records in spots in the eastern two thirds of the lower 48 States.
Not in FL.
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