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Excessive heat watch: Another 'dangerously hot' Friday in the forecast

Here comes the heat and humidity.

After a couple of nights where Minnesotans were able to sleep with the air conditioning off and the windows open, the heat is about to return in full force Friday into the weekend. 

The National Weather Service has already issued an excessive heat watch for the Twin Cities metro area and counties extending to the west all the way to the border with the Dakotas. The watch is in effect Friday afternoon through Friday evening., but you'll likely feel the rising humidity and dewpoints by late Thursday. 

"Dangerously hot conditions with heat index values up to 105 degrees possible in western, central and southern Minnesota, and heat index values up to 100 degrees possible in the Twin Cities metro area," the excessive heat watch says. 

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More on what to do to prevent heat-related illness: 

"Monitor the latest forecasts and warnings for updates on this situation. Be prepared to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

"Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes."

"Summer will quickly return with highs back in the 90s for Friday and Saturday. There is a chance of thunderstorms late Friday night into Saturday morning and again on Saturday evening," said the Twin Cities office of the National Weather Service. 

The forecast discussion from the NWS notes that storms entering Minnesota from the Dakotas Friday night into Saturday morning could be strong, though the big question is how long precipitation will last in central and northern Minnesota on Saturday. 

If it dries up early and the sun comes out, there could be a threat for severe storms redeveloping later Saturday. If it stays wet into the early afternoon, the severe threat could be diminished, as would the excessive heat potential.

Here's Novak Weather's video briefing from Wednesday afternoon talking about what could unfold. 

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