- Some areas of the Lehigh Valley received heavy rainfall Saturday night
- With more rain in the forecast Sunday, there's a threat of flash flooding
- A change in the weather system is coming by midweek
ALLENTOWN, Pa. — For the first time in four days, the threat of severe storms is absent from the Lehigh Valley weather forecast.
But the potential for rain throughout the day Sunday has forecasters warning of flash flooding.
Areas that received heavy rainfall recently are at greatest risk for flooding, according to the National Weather Service. In the Lehigh Valley, parts of Lehigh County got more than an inch-and-a-half of rain Saturday night and the Lehighton area of Carbon County reported over 2 inches.
The forecast calls for a chance of showers and thunderstorms throughout the day Sunday, with showers likely after noon. Some of the storms could produce heavy rainfall.
On the bright side, temperatures are unlikely to get close to peaking in the upper 80s and 90s as they did during last week’s late-summer heat wave. The current forecast calls for a high Sunday near 79.
But a stalled frontal boundary and an upper disturbance lifting out of the Southeast will support widespread showers, with areas of heavy rainfall, according to the Storm Prediction Center.
Monday will still have showers in the forecast but partly sunny skies and a high near 81.
Midweek will bring a game-changer, with clear skies taking over and daytime high temperatures in the 70s, according to the weather service.
