Severe Thunderstorms and Flash Flooding Expected in Northeast U.S.
• A slow-moving low-pressure system is forecast to bring multiple rounds of heavy showers and thunderstorms to the northeastern United States from today through Wednesday.
• According to the National Weather Service (NWS) briefing issued at 5:06 AM EDT on August 20, 2026, there is a significant risk of scattered to numerous flash flooding events, particularly in urban, poor drainage, and low-lying areas.
Impact & Risks
The primary risks include life-threatening flash flooding in urban and low-lying areas, particularly in the NYC metro area, northeast New Jersey, southwest Connecticut, and the lower Hudson Valley. Damaging wind gusts of 60-70 mph could lead to downed trees, power lines, and power outages, especially in northeast New Jersey and New York City. Minor to moderate river flooding may also affect quick-responding waterways, potentially causing localized disruptions to transportation and property damage.
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