Philadelphia weather: Isolated tornado, flash floods possible as severe storms roll in overnight

Another round of storms is on the way with the most severe weather to begin during the overnight hours, and continue into Tuesday morning.

The first round of storms hit the Delaware Valley early Monday evening ahead of the second round expected to roll in around 10 p.m. Monday, and last until 3 a.m. Tuesday.

FOX 29's Kathy Orr says the storms could bring tropical downpours, and potentially severe weather with damaging winds flash flooding, and even an isolated tornado. 

A flood watch has been issued for several Pennsylvania counties from 8 p.m. Monday to 6 a.m. Tuesday.

Philadelphia and most of the surrounding suburbs are under a slight risk of severe weather, while parts of the area more to the north are under a marginal risk.

Wednesday, Thursday, and Friday are also expected to be sunny and warm. 

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