Live · updated 1 min ago
Nassau County weather alerts
No active National Weather Service alerts for Nassau County, New York right now. The most recent was a Coastal Flood Statement that ended 11:00 AM.
40 in the last 30 days 102 in 12 months (since Aug 30) most common: Rip Current Statement Get alerts on your phone →
Active alerts for Nassau County
Refreshed every few minutes; times in EDT.
All clear in Nassau County
No warnings, watches or advisories are in effect. See what is active across the country, or check a neighbouring county below.
Get Nassau County alerts on your phone before you think to look them up
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Where
Nassau County on the map
Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.
Last 30 days
Recent alerts for Nassau County
| Alert | Issued | Ended | Issued by |
|---|---|---|---|
| Coastal Flood Statement | 1:42 AM | 11:00 AM | Upton NY |
| Coastal Flood Advisory | Oct 21, 2:26 AM | Oct 21, 7:00 PM | Upton NY |
| Coastal Flood Statement | Oct 20, 7:29 PM | Oct 21, 6:00 PM | Upton NY |
| Special Weather Statement | Oct 16, 6:13 PM | Oct 16, 7:15 PM | Upton NY |
| Severe Thunderstorm Watch | Oct 16, 4:02 PM | Oct 16, 10:00 PM | Upton NY |
| Coastal Flood Statement | Oct 12, 2:53 PM | Oct 13, 12:00 PM | Upton NY |
| Coastal Flood Statement | Oct 12, 3:52 AM | Oct 12, 11:00 AM | Upton NY |
| Flood Advisory | Oct 11, 5:21 PM | Oct 11, 8:00 PM | Upton NY |
| Coastal Flood Statement | Sep 29, 5:16 AM | Sep 29, 12:00 PM | Upton NY |
| Coastal Flood Statement | Sep 28, 3:10 PM | Sep 29, 1:00 AM | Upton NY |
| Coastal Flood Advisory | Sep 28, 5:01 AM | Sep 28, 2:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 28, 5:01 AM | Sep 28, 3:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 8:57 PM | Sep 28, 2:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 8:57 PM | Sep 28, 2:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 8:40 PM | Sep 28, 2:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 8:40 PM | Sep 28, 2:00 PM | Upton NY |
| Rip Current Statement | Sep 27, 3:14 PM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 3:14 PM | Sep 28, 2:00 PM | Upton NY |
| Coastal Flood Advisory | Sep 27, 3:14 PM | Sep 28, 2:00 PM | Upton NY |
| High Surf Advisory | Sep 27, 3:14 PM | Sep 27, 8:00 PM | Upton NY |
| High Wind Warning | Sep 27, 11:32 AM | Sep 27, 12:00 PM | Upton NY |
| Rip Current Statement | Sep 27, 6:02 AM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Warning | Sep 27, 6:02 AM | Sep 27, 6:00 PM | Upton NY |
| Coastal Flood Warning | Sep 27, 6:02 AM | Sep 27, 6:00 PM | Upton NY |
| High Surf Advisory | Sep 27, 6:02 AM | Sep 27, 8:00 PM | Upton NY |
| High Surf Advisory | Sep 27, 5:36 AM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Warning | Sep 27, 5:36 AM | Sep 27, 6:00 PM | Upton NY |
| Rip Current Statement | Sep 27, 5:36 AM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Warning | Sep 27, 5:36 AM | Sep 27, 6:00 PM | Upton NY |
| High Wind Warning | Sep 27, 3:53 AM | Sep 27, 12:00 PM | Upton NY |
| Rip Current Statement | Sep 26, 4:23 PM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Warning | Sep 26, 4:23 PM | Sep 27, 6:00 PM | Upton NY |
| Coastal Flood Warning | Sep 26, 4:23 PM | Sep 27, 6:00 PM | Upton NY |
| High Surf Advisory | Sep 26, 4:23 PM | Sep 27, 8:00 PM | Upton NY |
| High Wind Warning | Sep 26, 1:47 PM | Sep 27, 12:00 PM | Upton NY |
| Coastal Flood Warning | Sep 26, 5:14 AM | Sep 27, 6:00 PM | Upton NY |
| Rip Current Statement | Sep 26, 5:14 AM | Sep 27, 8:00 PM | Upton NY |
| Coastal Flood Warning | Sep 26, 5:14 AM | Sep 27, 6:00 PM | Upton NY |
| High Surf Advisory | Sep 26, 5:14 AM | Sep 27, 8:00 PM | Upton NY |
| Wind Advisory | Sep 26, 4:40 AM | Sep 27, 6:00 AM | Upton NY |
Pattern
What Nassau County gets alerted for
Every alert that named Nassau County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.
Plain English
What these alerts mean
A warning means the hazard is happening or about to; a watch means conditions favour it; an advisory is a lesser hazard still worth planning around.
Minor coastal flooding is expected, usually around high tide. Expect water on low-lying roads near the shore.
A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.
Conditions are favourable for severe thunderstorms with large hail or damaging wind. Keep an eye on the sky and on warnings.
Minor flooding of streets, streams or low-lying areas is expected. Expect ponding on roads and use caution when driving.
Rip currents that can pull swimmers offshore are expected. Swim near a lifeguard and know how to escape a rip.
Large breaking waves are expected on beaches, with dangerous rip currents. Stay off jetties and out of the water.
Sustained winds of 40 mph or more, or gusts of 58 mph or more, are expected. Secure loose objects and expect downed trees and power lines.
Significant coastal flooding is occurring or imminent, typically at high tide. Move away from low-lying shoreline areas.
Sustained winds of 30 mph or more, or gusts to 45 mph, are expected. Use caution driving high-profile vehicles.
Significant coastal flooding is possible. Prepare to protect property near the shore.
Conditions are favourable for flooding. Have a plan in case a warning is issued.
Nearby
Alerts near Nassau County
Cities in Nassau County
Neighbouring counties in New York
Questions
About Nassau County alerts
How do I get Nassau County weather alerts on my iPhone?
Install Forecast Bar, add Nassau County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Nassau County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.
Where do these alerts come from?
From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names Nassau County. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.
What is the difference between a watch, a warning and an advisory?
A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.
Can I get this data as JSON?
Yes. /weather-alerts/ny/nassau-county.json returns the active alerts, the last 30 days and the 12-month counts for Nassau County, refreshed every minute. Please cache responses and credit National Weather Service as the source.
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