FORECAST UPDATED. VIEW MONDAY’S FINAL CALL RAIN AND WIND FORECAST HERE.

 

Although there is a slight risk for eastern PA today (Sunday), most of the storms will come this morning, as we have seen in the Lehigh Valley. There may still be some isolated severe thunderstorms this evening, but the overall threat has decreased compared to earlier guidance.

All eyes turn to the storm you have been hearing about for days: Isaias. Its track has shifted more and more west, resulting in a wider area of heavy rain likely in the eastern half of the state.

Timing of the rainfall and gusty winds will be late Monday evening through late Tuesday evening, but the heaviest rainfall will come late Tuesday morning through early Tuesday evening. Winds may also gust up to 45 MPH in southeast PA early Tuesday afternoon. We will have future radar in Monday morning’s update.

Flash flooding will be possible as Isaias moves through, especially in areas that have seen heavy rain in the past 24 hours. We expect rainfall rates of 1 to 1.5″ an hour in the heaviest rain bands, which are anticipated to be in southeast PA, Lehigh Valley, and southern Poconos.




ISAIAS RAINFALL FORECAST MAP

Area A: Rainfall amounts of 3 – 5″ expected, most of which will fall Tuesday afternoon. Urban street flooding is possible, especially in areas with poor drainage.

Area B: Rainfall amounts of 2 – 3″ anticipated, falling mostly Tuesday afternoon. Urban street flooding will be possible in areas with poor drainage.

Area C: Rainfall amounts of 1 – 2″ expected, mostly falling Tuesday afternoon.

Area D: Rainfall amounts of 1/2 – 1″ anticipated.

Turn around, don’t drown. And remember these facts from the NWS:

* Six inches of water will reach the bottom of most passenger cars causing loss of control and possible stalling.
* A foot of water will float many vehicles.
* Two feet of rushing water can carry away most vehicles including sport utility vehicles (SUV’s) and pick-ups.

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Last updated on August 3, 2020
Josh has been passionate about weather as long as his memory dates! From watching the Weather Channel at age 7, to making hand-drawn hurricane maps at age 11, starting his first weather site at 13, and founding PWA at 15 and forecasting for the state for the past 9 years, Josh's interest in weather has never dwindled! As difficult as it is, he greatly enjoys forecasting for Pennsylvania due to its countless microclimates. The state is an East Coast severe weather hotspot and nearly always home to the rain/snow line during winter storms!
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