Philadelphia weather: Excessive heat warning through Sunday evening

PHILADELPHIA - The Philadelphia-area is at the outset of a heat wave that forecasters believe won't let up anytime soon. 

The heat wave is expected to peak on Sunday, with forecasters calling for temperatures to reach 98 degrees. A region-wide Excessive Heat Warning is in effect until Sunday evening.

The next chance of rain will come on Sunday night and some pop-up thunderstorms could contain a lot of rain, so be alert for flash flooding.

Monday will see temps up to 90 degrees, but with lower humidity and breezy conditions by the afternoon. Humidity is lower Tuesday, as well.

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SUNDAY: Storm chance. High: 98, Low: 79

MONDAY: Hot, storm chance. High: 92, Low: 77

Tuesday: Low humidity. High: 92, Low: 72

Wednesday: Afternoon storms. High: 94, Low: 74