Big Cold Front to Blast South, Bringing Much Cooler Temps and Possible First Frost
It’s been brutally hot for parts of the U.S. this summer and if you’re looking for a solid taste of fall, it might be on its way. Forecast models are continuing to indicate a strong cold front will blast south late this week, bringing temperatures way down and possibly producing the first frost of the season.
Canadian air is expected to start slipping into the northern Rockies late Tuesday. Afternoon highs will only top out in the upper 40s and low 50s for places like Glasgow, Mont. and Minot, N.D. Lows moving into early Wednesday will bottom out in mid-30s to mid-40s for a large swath of the Intermountain West and the High Plains. Wednesday into Thursday, sufficient lift will be in place across parts of northwest Montana to fire off a few snow showers, especially in the higher elevations. The potential for accumulating snow — above 5,000 feet — has lead the National Weather Service in Missoula and Great Falls to issue winter weather advisories for much of Glacier National Park and the surrounding areas. If you’re traveling through these areas use caution in the higher passes.
The cool Canadian air will continue to push south as the week progresses. And by Wednesday, that cooler air will be settling in to places like the Twin Cities, Omaha and Duluth, Minn. High temperatures in the Arrowhead of Minnesota will be hard-pressed to make it to 50 degrees, while Minneapolis is likely to stay in the upper 50s through the afternoon.
Thursday morning lows across the Dakotas and Montana look to bottom out in the mid-30s, but some locations could push below the freezing mark. This means some people could be looking at their first frost of the season. So, if you live in this areas it’s a a good idea to take tender vegetation indoors.
Thursday afternoon, the cold front and trailing chilly air will push past Chicago much cooler afternoon highs. Expect temperatures to top out in the mid-60s, a far cry from the near-80 degree temperature of Monday.
Friday, the cool air across the northern tier of the country will begin to moderate a bit. That said, you’ll still need a jacket throughout the day. Highs will mainly be in the upper 40s and low 50s, especially in the Great Lakes region. Highs from Oklahoma City to Chicago will be in the low to mid-60s.
By Friday night, the front is likely to stall out across the southern U.S., limiting the forward progress of the cool air. Highs from Nashville to Washington, D.C. are forecasted to be below average, in the low 70s.
At the height of the cool air intrusion, some cities will see temperatures 20 to 30 degrees below normal.
Keep your cold weather gear handy for the next few days!
Meteorologist Alan Raymond