The calendar now says "October," and a plunge of chilly air is driving south in time for the month's first weekend in the Midwest and East. Meanwhile, the West coast will be heating back up.
This past Sunday, Caribou, Maine basked in 84-degree warmth, the hottest temperature on record so late in the season, there. Daily record highs were also set Sunday in at least a dozen other northern cities, including Newark (87), Providence (86), Sault Ste. Marie (80) and Duluth (81).
Changes, however, are in the wind, and they will continue into the weekend. An upper-atmospheric trough is carving southward into the East and Midwest, while a corresponding upper-atmospheric ridge builds into the West. The past few days we have had a ridge in the East and a trough in the West.
This pattern change will bring temperatures that are 20-30 degrees colder for some locations in the northern Plains. Temperatures will also be cooler in parts of the Midwest and Northeast, where highs will go from the 70s and 80s this past weekend, to the 50s and 60s, with a few locations in the Midwest even staying in the 40s, this weekend.
Over the weekend, we can't rule out a few wet snowflakes mixing in with a cold, wind-driven light rain from Minnesota and Iowa into Illinois and Michigan.
In fact, there should be bands of lake-enhanced rain, and yes, perhaps some wet flakes in the hills away from the lakes, overnight through at least early Sunday from Upper Michigan to central and Upstate New York. Quite a calling card for fall, eh?
So fall conditions will likely return to the Midwest and Northeast this weekend, while summer won't let go of the West coast yet. Fall is definitely a season of change and this will be apparent to many as we head through early October.
http://www.weather.com/news/weather-forecast/pattern-change-ahead-20140927
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