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Beautiful Monday for Home Run Derby in Philadelphia before heat wave begins. Here's the weather forecast.

A home run of a forecast as we lead up to tonight's derby at Citizens Bank Park! We'll have seasonably warm temperatures in the mid to upper 80s with sunshine and seasonable humidity levels. Perfect for outdoor activities and storm cleanup.

High temperatures Monday will be in the 80s
CBS News Philadelphia

NEXT big change

Heat wave No. 5 arrives Tuesday, just in time for the All-Star Game in South Philly.

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CBS News Philadelphia

A dome of dangerous heat is building across the western U.S. with highs in Montana near 110 degrees Sunday! That heat shifts east by Tuesday.

Expect 90s Tuesday through Friday with highs topping out around 100 on Wednesday. Humidity will also increase, and at times, the feels-like temperature will exceed 100 degrees.

A NEXT Weather Alert is in effect for Wednesday's heat. We could experience dangerous heat index values in the 105-110 range. 

Due to the heat and humidity isolated pop-up storms are possible each day.

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CBS News Philadelphia

A strong cold front will approach by the weekend and will likely set off some strong storms as the heat breaks down. We'll monitor this timeframe for a possible NEXT Weather Alert for severe storms.

Following the front, a cooler and more comfortable air mass arrives by next Sunday.

Here's your 7-day forecast: 

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CBS News Philadelphia

Monday: Mostly sunny. High 86, low 67.

Tuesday: Heat wave begins. High 94, low 68.

Wednesday: NEXT Weather Alert for excessive heat. High 100, low 77.

Thursday: Hot and humid. High 96, low 78.

Friday: High 96, low 76.

Saturday: Chance of storms. High 92, low 76.

Sunday: Partly cloudy. High 84, low 73.

NEXT Weather Radars

Hourly Forecast

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