Scattered strong thunderstorms have developed in a line that runs from south central PA to just NW of Washington, DC and this line is heading eastward towards SE PA and northern Delaware. The greatest threat for storms will be across the western and southern suburbs of Philly (e.g., Chester, Delaware Counties and northern Delaware) between 9PM and midnight. Some of these storms will contain brief heavy rains and gusty winds. Tomorrow promises to be another very hot and humid day following tonight's scattered strong thunderstorms.
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