Updated Fri 4:25 PM, highlighted below, based on new HRRR
Updated Fri12:30 PM, highlighted below, based on new HIRESW
Strong thunderstorms expected early this evening. The latest HRRR shows all the ingredients coming together about 4:30 -8:30 PM
5:30 – 9 PM (peak 7-8 PM) in Philadelphia.
Update: The latest HRRR has the heaviest storms just to the south of Philadelphia
CAPE values in the 1600-2200 J/Kg range. Lifted Index moderately negative at -5. Very strong upward vertical motion is predicted to develop (blue shading/white arrow below) along with cyclonic upper air contour (blue arrows).
Heavy rain expected, especially from Philadelphia south and east.