WEATHERAmerica Newsletter, Sunday, August 31, 2025; SHORT RANGE OUTLOOK

[Larry Cosgrove]

SHORT RANGE OUTLOOK

(Through The Next 72 Hours)

 

A Rather Cool Start To September....

METEOBLUE

PivotalWeather.Com (3)

ECMWF

While it may well be premature to say that the nation is done with summer weather, the truth is that a polar air mass will control much of the eastern 2/3 of North America in the near term. Moderation occurs for the initial cP regime, simply because there is still some prominent sunshine above the horizon, and ground warmth from the past 90 days is still a factor. There is heat to be had under the western ridge axis, but monsoonal moisture to the left of the Continental Divide will keep readings above 100 deg F scattered to downslope locations. And of course, to add insult to summer lovers, another and stronger cold front will be digging out of central Canada at midweek.

....West Ridge Suggests Another Trough, Cold Front....And Thunderstorms!

METEOBLUE

UQAM Meteocentre (3)

University Of Wisconsin Weather Server (3)

TwisterData.Com (3)

College Of DuPage Weather Laboratory

Thunderstorms in the weakness over Texas and the Great Plains have been troublesome, and will still be a factor on Labor Day and probably Tuesday as well. The deep tropical moisture associated with a diffuse frontal structure running close to and parallel of the Gulf Coast and Southeast Atlantic shorelines may set up chances for heavy rain and thunderstorms. Some of the moisture will be caught up in the incoming cold front through the Midwest/Great Lakes, setting up a prominent severe weather threat from Manitoba and Ontario into the Missouri and Ohio Valleys. Monsoonal moisture may start to be suppressed , however, given the strong ridge signal running from Alaska into the Desert Regions. An x-factor to watch: there may be another Mexican coastal hurricane approaching that sends a high dewpoint regime into Texas and Oklahoma by Day 4.