Record heat: Philadelphia reached a high of 95°F (35°C) on Wednesday, breaking the old record of 94°F (34.4°C) set in 1962.
Severe thunderstorms: A severe thunderstorm watch was in effect for much of southeastern Pennsylvania, Delaware, and New Jersey until 9 p.m. Wednesday, with isolated strong to severe storms expected.
Potential hazards: The main threats from the storms included quarter-sized hail, wind gusts up to 70 mph, and frequent lightning.
Flash flooding: Flash flood warnings were issued for parts of Burlington, Camden, Gloucester, Bucks, Delaware, Montgomery, and Philadelphia counties.
Cool down: A cold front is expected to bring much cooler and wetter conditions for the Memorial Day weekend, with highs in the 50s and 60s.
Southeastern Pennsylvania and surrounding areas experienced a day of weather extremes. The record heat on Wednesday was followed by a cold front that triggered severe thunderstorms. The National Weather Service issued warnings for potential hail, damaging winds, and flash flooding.
The storms began mid-afternoon and continued into the evening, affecting areas including Philadelphia, Chester, Camden, Levittown, Trenton, Norristown and Middletown, Delaware. A flash flood warning was issued for several counties in the region, urging residents to stay updated on weather forecasts and alerts.
The cold front will bring a significant change in temperature, with Thursday expected to be rainy and cool, with a high of only 62°F (16.7°C). The Memorial Day weekend is forecast to be wet and chilly, with highs in the 50s and 60s. Saturday will be the coldest day, with highs only reaching 56°F (13.3°C). While Memorial Day itself is expected to be mostly cloudy with a slight chance of showers and a high of 74°F (23.3°C).
How to Prepare
Stay informed: Monitor weather forecasts and alerts from the National Weather Service.
Secure property: Take precautions to protect your home and belongings from potential hail, wind, and flooding.
Plan accordingly: Be prepared for cooler and wetter conditions during the Memorial Day weekend.
Q: What were the main threats during the severe thunderstorm watch?
The main threats were potential hail, wind gusts up to 70 mph, and frequent lightning.
Q: What is the weather forecast for Memorial Day weekend?
The Memorial Day weekend is expected to be wet and chilly, with highs in the 50s and 60s. Memorial Day itself will be mostly cloudy with a slight chance of showers and a high of 74°F (23.3°C).
The Philadelphia region experienced record heat followed by severe thunderstorms on Wednesday, May 20, 2026.
Be aware of potential hazards such as hail, strong winds, and flash flooding during severe storms.
A cold front will bring cooler and wetter conditions for the Memorial Day weekend.
Do you think this weather pattern will continue into the summer? Let us know!
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