Nassau County, NY
Alerts
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Briefing
From the Forecaster
Weather Story for Tuesday, July 21st, 2026
Created by the NWS New York City WFO
Multiple rounds of showers and thunderstorms with heavy rain are expected Tuesday morning into Tuesday night. This could lead to scattered instances of flash flooding. A Flood Watch is in effect for Tue for NE NJ and NYC. Severe thunderstorms are also possible, with the highest probabilities for western portions of the forecast area.
Seven-day Weather Risk Overview
The graphic shows the daily risk summary for 7 days. Daily risk is based on highest risk factor for that day.
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table legend
No risk
Low risk
High risk