Balmy Saturday; then a serious cooldown
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Dense Saturday morning fog that has been blanketing areas north of the Twin Cities from Princeton and Rush City through Duluth to the North Shore, the Iron Range and northwestern Wisconsin will thin out as the morning progresses.
One more balmier-than-normal day
Saturday will be one last summery day to enjoy. Look for high temperatures from the upper 60s up north to the upper 70s for the south. Thermometers in vehicles traveling I-90 across southern Minnesota might touch 80 degrees at times. The Twin Cities should warm to about 76 if a little sunshine breaks through the clouds. Winds will be light.
Scattered showers have spread from northwestern Minnesota into north central parts of the state and will track eastward into the Arrowhead.
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Strong and severe storms likely for northern Wisconsin
A low pressure center and its attendant warm front will race across our area Saturday afternoon. The intensifying weather system and the heating of the day are likely to conspire to generate an outbreak of strong and possibly severe thunderstorms tracking northeast across northern Wisconsin Saturday evening. The Storm Prediction Center has issued a Slight Risk for severe weather across much of northern Wisconsin and Upper Michigan for Saturday and Saturday night.
The Twin Cities might see a few brief thunderstorms late Saturday afternoon if this outbreak begins just a bit farther west before crossing the St. Croix River into Wisconsin.
Cooldown begins on Sunday
The first of several rounds of much cooler Canadian air will arrive on Sunday. Expect highs from the upper 50s in the north to the upper 60s farther south. While a gusty west breeze will have a cooling effect, those temperatures will be about normal for late September.
Scattered showers will dot radar screens on Sunday, mainly in the afternoon.
More cold fronts during the week means progressively cooler temperatures. The autumnal cooldown will continue for much of the upcoming week with periods of scattered showers and gusty winds.
Looking way ahead
Forecast models are calling for some thermal recovery next weekend, followed by a few days of an actual warmup after the weekend.
