Flood Advisory — Nassau County, New York
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Current Status
🌊 Active: Flood Advisory
Flood Advisory issued August 3 at 8:53AM EDT until August 3 at 10:45AM EDT by NWS Upton NY
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southeast New York, including the following counties, Nassau and Suffolk. * WHEN...Until 1045 AM EDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 853 AM EDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Huntington Station, Glen Cove, Huntington, Northport, Oyster Bay, Bayville, Centerport, Cold Spring Harbor, East Northport, Greenlawn, Elwood, Fort Salonga, Glen Head, Lloyd Harbor, Muttontown, Locust Valley, East Norwich, Oyster Bay Cove, Old Brookville and Upper Brookville. - http://www.weather.gov/safety/flood
Effective August 3, 2026 at 8:53 AM ET · Expires August 3, 2026 at 10:45 AM ET
Event Details
Event Type
Flood Advisory
Severity
minor
Issued By
NWS Upton NY
Expires
August 3, 2026 at 10:45 AM ET
Last Checked
1 minute ago
What To Do
📋 Official NWS Guidance
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Also In Effect For
This same Flood Advisory also covers:
Other Active Alerts in New York
Flood Advisory
Flash Flood Warning
Flash Flood Warning
Flood Advisory
Flash Flood Warning
Get Flood Advisory Alerts for Nassau County
StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
Frequently Asked Questions
What does a Flood Advisory mean for Nassau County, New York?
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Is this Flood Advisory currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire August 3, 2026 at 10:45 AM ET.
How do I get notified about Flood Advisory alerts for Nassau County?
Download StormCast free on Google Play and set Nassau County, New York as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Flood Advisory is also in effect for Suffolk County.