WEATHERAmerica Newsletter, Saturday, June 3, 2023 at 11:15 P.M. CT; Near Term Forecast

[Larry Cosgrove]

SHORT RANGE OUTLOOK

(Through The Next 72 Hours)

 

Another Polar Air Mass Intrusion Across The Midwest/Great Lakes Into The Eastern Seaboard

METEOBLUE

PivotalWeather.Com (3)

ECMWF

Since it is June, cold frontal passages do not have the same degree of change as would be the case in early Spring. But the matter of a cold closed 500MB low that sits in the vicinity of Nova Scotia will keep the summer heat away from the Midwest/Great Lakes and the Northeast. A shortwave wrapping around the circulation may stimulate shower and thunderstorm production from Ontario and Quebec into the Mid-Atlantic, New England and Maritime Provinces in the near term, and may last into late week as well. Note that the temperature impacts will be virtually nil in the Mississippi Valley and Southeast.

Warm (But Not Really Hot) And Unstable Air Mass Brings Isolated Thunderstorm Risks Across Intermountain Region, Texas, And Great Plains

METEOBLUE

UQAM Meteocentre (3)

TwisterData.Com (3)

University Of Wisconsin Weather Server (3)

College Of DuPage Weather Laboratory

The large but diffuse closed 500MB low off of the West Coast will attempt to undercut ridging in western and central Canada, but largely fail. No strong thermal reversals are likely with the arrival of the disturbance, but thunderstorms will pop up on a diurnal and orographic basis. The air mass will be unstable (cold aloft vs. warm at surface), so hail and brief tornado risks will be apparent through much of the new week from Texas and the Great Plains into the Pacific Shoreline. A dry patch from northwestern Mexico into the Desert Regions could allow for some hotter readings, but for the most part, any truly extreme heat will not develop until next weekend.