Tropical downpours, severe risk
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Our morning gully-washers are a symptom of an unseasonably tropical air mass for mid-September.
Dew points hit 70 degrees overnight. That's overnight and early morning of Sept. 17. The nocturnal trigger for a line of slow moving storms that dumped 2 to 3 inches rainfall on a fairly small zone over St. Paul and some east metro suburbs.
Here's the storm total rainfall mode from Twin Cities Doppler on Weather Underground.
The atmosphere will try and reload this afternoon from the metro east into Wisconsin. This morning's storms may limit heating, and that could push the highest severe risk east.
Keep an eye out, and stay situationally aware as storms begin to re-fire this afternoon. Any severe threat shifts east by Friday as cooler air sweeps in.
A few showers may linger into early Saturday, but the weekend trend looks brighter and sunnier. Another mostly fine weekend, and a spectacular Sunday.
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