Philly Weekend Weather Outlook

GFS forecast for early Saturday evening
GFS forecast for early Saturday evening

The models have been consistent in predicting low pressure development along a stalled frontal boundary, with heavy rain for Saturday in our area.

The models have the precipitation lifting out to the northeast on Sunday, but the amount of clearing is uncertain, since we will still be in a cyclonic wind flow.

 

Philly Weekend Weekend Weather Update

Advancing moisture aloft with cirrocumulus undulatus
Advancing moisture aloft with cirrocumulus undulatus

Latest NAM and GFS models similar in having the remnants of what was tropical storm Bill move directly over our area for Saturday night into Sunday morning.  Both models crank out about 2 inches of rain with the heavy rain falling after midnight Saturday into daybreak Sunday.

It’s not surprising that the NWS issued a flash flood watch for this time period.

It appears that Saturday will start dry, but showers and thunderstorms develop late afternoon and become progressively heavier during Saturday night.

See my earlier forecast for other details.

Storm Forecasts & Other Things "up in the air".