WEATHERAmerica Newsletter, Saturday, November 8, 2025; SHORT RANGE OUTLOOK

[Larry Cosgrove]

SHORT RANGE OUTLOOK

(Through The Next 72 Hours)

 

Alberta Clipper, Polar Air Mass Send A Short-Lived Chill Into Eastern Half Of The U.S.

METEOBLUE

PivotalWeather.Com (3)

ECMWF

The sometimes brutal media assault about the cold intrusion is mind-boggling. Set up by a moderate +PNA ridge and a digging Alberta Clipper that will get as far south as St. Louis MO on Sunday night, the cPk domain (not cA....) will be a quick mover with moderation since no true blocking is yet established at the higher latitudes. In other words: no Alaska or Greenland block is present to anchor the trough which will speed eastward on November 9-10 in a negative tilt. Incredibly, there is a marginal threat for intense thunderstorms in the Northeast ahead of the cold air mass. Snowfall on a local level could be quite heavy in the Great Lakes and St. Lawrence Valley, and maybe much of Appalachia as well. Keep in mind that the "real stuff" of an Arctic air mass will stay below freezing, day and night, over an entire region for 3 or 4 days. I have seen sieges of bitter cold that are shallow and last less than a day, but this regime is mobile and easily modified. You will see this when all the warmth in Mexico and the West floods the states east of the Mississippi at midweek.

But you will see true, lasting Arctic air this winter. Just be patient, and turn up the heat in the next couple of days.

West Coast Storm Is Slow To Move

METEOBLUE

UQAM Meteocentre (3)

University Of Wisconsin Weather Server (3)

TwisterData.Com (3)

College Of DuPage Weather Laboratory (2)

We keep seeing that "Aleutian + Gulf of Alaska" storm complex show up on satellite images and in the numerical models. Soon these vortices will begin to descend in latitude, forming a deep trough with a possible Kona Low gyre above Hawaii. That has not happened as of yet, so the linkage of the two disturbed areas produce warm advection across the western and central sections of the lower 48 states. Ultimately, that lining up prevents  persistent cold in the East, and also means a dry presentation in much of the nation. That is, once the currently evolving trough pulls out. The frontal passage will scour out most of the country of high dewpoints and instability (see the lifted index maps), so it will take some time before the precipitation in British Columbia will start to show up to the right of the Rocky Mountains.