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Environment & Science

Lehigh Valley under flash flood warning amid soaking thunderstorms

Flash flood warning Aug. 18, 2024
Courtesy
/
National Weather Service
The National Weather Service issued a flash flood warning for parts of Lehigh and Northampton counties until 9:30 p.m. Sunday, Aug. 18, 2024.

BETHLEHEM, Pa. — Much of the Lehigh Valley is under a flash flood warning into Sunday night.

The National Weather Service issued the warning for parts of Lehigh and Northampton counties until 9:30 p.m., then extended it to 11:30 p.m. It includes the Allentown, Bethlehem and Easton areas.

The warning was first issued about 5:30 p.m. after 1 to 2 inches of rain fell across parts of the region. An additional 1 to 2 inches are possible in the warned areas, according to the weather service.

A flood watch remains in effect until 2 a.m. Monday for the Lehigh Valley and much of southeastern Pennsylvania.

The National Weather Service issued the watch for several counties in eastern Pennsylvania, New Jersey and Delaware.

Soggy weather has been the theme for the weekend, with showers and patchy fog followed by severe thunderstorms.

A severe thunderstorm watch will be issued my mid-afternoon across a wide region, according to the Storm Prediction Center.

The weather affected the Lehigh Valley Pride festival at SteelStacks in Bethlehem, forcing organizers to suspend activities around 4:30 p.m.

Widespread rainfall amounts of 1 to 3 inches, with locally higher amounts, were predicted earlier in the day.

There’s also a 15 to 29 percent probability for damaging wind gusts for the Pennsylvania-New Jersey-Delaware region.

Storm runoff may result in flooding of streams, creeks and rivers and other low-lying and flood-prone areas, forecasters said.

Storm runoff may result in flooding of streams, creeks and rivers and other low-lying and flood-prone areas, forecasters said.

Sunday’s high should reach 80 degrees with a low of 67 overnight. Showers and a slight chance of thunderstorms are in the forecast Monday, with a high of 81.

A cold front will move into the region late on Monday into Monday night, with splendid weather to take us into the middle of the week.

Tuesday will be mostly sunny with a high of 72, with sunny skies and a high of 75 on Wednesday. Mostly clear weather sticks around for the rest of the week as temperatures begin to creep upward, according to the forecast.