Hot and sticky Monday, with strong storms expected overnight

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It's going to be a hot one.

Temperatures are expected to range from the mid-80s to lower 90s across the state, with heat indices near 95 degrees, the National Weather Service says. And expect high humidity – it's at 84 percent Monday in the Twin Cities, the weather service notes.

The hot and muggy day will lead to widespread showers and thunderstorms overnight, with the potential of some being severe, especially in the western half of the state, the weather service says.

The line of thunderstorms may keep the Twin Cities from hitting 90 degrees on Tuesday, meteorologist Paul Douglas wrote on the Star Tribune's weather blog. But the sticky factor will still be there as the dew point is expected to be in the mid-70s, Douglas notes.

Weather officials are reminding people to take precautions to avoid heat-related illnesses as the mercury climbs.

Expect some relief by Wednesday as a front sweeps down from Canada bringing slightly cooler air, with far less humidity, reports note. The dew point is expected to drop into the 50s and 60s for the second half of the week, Douglas says.

Temperatures are expected to be in the lower 70s to lower 80s across the state Wednesday, with slightly warmer highs expected Thursday and Friday, the weather service notes.

Heat causes roads to buckle

The hot weather isn't just an issue for those planning to spend a lot of time outdoors. The heat and humidity over the weekend caused some roads to buckle.

Forum News Service says Interstate 29 in Fargo re-opened Sunday night after being closed for about three hours after a portion of the roadway cracked open from the heat. And on Friday, lanes were closed on Interstate 394 near Wayzata due to a pavement failure, however it hasn't been reported if this was also due to the weather.

"With our hot summer days, our roadway starts to expand a considerable amount and eventually if there's too much expansion, there's pressure and the pressure needs to be relieved and the concrete just buckles," North Dakota Department of Transportation assistant district engineer Kevin Gorder told Forum News.

Gorder says this was the fourth incident of pavement failure this summer, Forum News notes.

Pavement failures aren't all that uncommon in the summer, especially on older roads, the Star Tribune reported last year. Newer roads are sealed tighter, making them less prone to heat-related stress and buckling, the paper notes.

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