5 National Weather Service alerts are in force for Nassau County: 2 coastal flood warnings, a high wind warning, a rip current statement and a high surf advisory.
Checked Sat, Sep 26, 2026, 4:22 PM EDT. Times are Eastern Daylight Time.
Every watch, warning and advisory the National Weather Service has in force over Nassau County, New York. Open it for the live map, where it pans and zooms.
Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.
Alerts in force5
Every product in force for Nassau County, worst first, with its full text.
Coastal Flood Warning
Severe
Coastal Flood Warning issued September 26 at 5:14AM EDT until September 27 at 6:00PM EDT by NWS Upton NY
Issued Until 25 hr 37 min left
Areas Southwest Suffolk, NY; Southern Nassau, NY
Full text
* WHAT...For the Coastal Flood Warning, one to two feet and
locally up to 2 1/2 feet of inundation above ground level in
vulnerable areas near the waterfront and shoreline. For the High
Surf Advisory, large breaking waves of 7 to 14 feet in the surf
zone. For the High Rip Current Risk, dangerous rip currents.
* WHERE...Southwest Suffolk and Southern Nassau Counties.
* WHEN...For the Coastal Flood Warning, until 6 PM EDT Sunday.
For the High Surf Advisory, until 8 PM EDT Sunday. For the
High Rip Current Risk, through Sunday evening.
* COASTAL FLOOD IMPACTS...Widespread moderate to major flooding of
vulnerable areas near the waterfront and shoreline. There is an
elevated threat to low lying properties. Flooding could extend
inland from the waterfront and shoreline into areas that
typically don't experience coastal flooding. Flooding will
likely be exacerbated along north facing shorelines from wave
action, particularly for the barrier island from Atlantic Beach,
Long Beach to Jones Beach. This will result in numerous road
closures and cause widespread flooding of low lying property
including parking lots, parks, lawns, and homes and businesses
with basements near the waterfront. Vehicles parked in
vulnerable areas near the waterfront will likely become flooded.
Flooding in the most vulnerable areas may not totally recede
during the times of low tide.
* SHOREFRONT AND BEACH IMPACTS...Breaking waves of 6 to 10 feet
along with elevated water levels will result in widespread dune
erosion and beach flooding. Localized overwashes are possible
where dune structures are compromised, resulting in some
flooding of roadways and vulnerable structures behind protective
dunes. Dangerous swimming and surfing conditions and localized
beach erosion. Life threatening rip currents are likely for all
people entering the surf zone. Anyone visiting the beaches
should stay out of the surf. Rip currents can sweep even the
best swimmers away from shore into deeper water.
What to do
Take the necessary actions to protect flood prone property. If
travel is required, do not drive around barricades or through
water of unknown depth.
Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.
Coastal Flood Warning issued September 26 at 5:14AM EDT until September 27 at 6:00PM EDT by NWS Upton NY
Issued Until 25 hr 37 min left
Areas Bronx, NY; Northwest Suffolk, NY; Northern Queens, NY; Northern Nassau, NY
Full text
* WHAT...One to two feet and locally up to 2 1/2 feet of
inundation above ground level in vulnerable areas near the
waterfront and shoreline.
* WHERE...Bronx, Northwest Suffolk, Northern Queens and Northern
Nassau Counties.
* WHEN...Until 6 PM EDT Sunday.
* COASTAL IMPACTS...Widespread flooding of vulnerable areas near
the waterfront and shoreline, including roads, parking lots,
parks, lawns, and homes and businesses with basements near the
waterfront. Numerous road closures are likely, and vehicles
parked in vulnerable areas near the waterfront will likely
become flooded. Flooding will also extend inland from the
waterfront along tidal rivers and bays.
* SHOREFRONT AND BEACH IMPACTS...Breaking waves of 3 to 6 feet,
along with elevated water levels, will result in areas of dune
erosion with damage to a few waterfront structures possible.
Splashover over seawalls and overwashes where dune structures
are compromised may locally exacerbate flooding of roadways and
vulnerable structures behind protective dunes.
What to do
Take the necessary actions to protect flood prone property. If
travel is required, do not drive around barricades or through
water of unknown depth.
High Wind Warning issued September 26 at 1:47PM EDT until September 27 at 12:00PM EDT by NWS Upton NY
Issued Until 19 hr 37 min left
Areas Northern New London, CT; Southern Middlesex, CT; Southern New London, CT; Northwest Suffolk, NY; Northeast Suffolk, NY; Southwest Suffolk, NY; Southeast Suffolk, NY; Northern Nassau, NY; Southern Nassau, NY
Full text
* WHAT...Northeast winds 25 to 35 mph with gusts up to 65 mph.
* WHERE...In Connecticut, Northern New London, Southern Middlesex,
and Southern New London Counties. In New York, Northeast Suffolk,
Northern Nassau, Northwest Suffolk, Southeast Suffolk, Southern
Nassau, and Southwest Suffolk Counties.
* WHEN...Until noon EDT Sunday.
* IMPACTS...Damaging winds will blow down trees and power lines.
Widespread power outages are expected. Travel will be difficult,
especially for high profile vehicles.
What to do
People are urged to secure loose objects that could be blown around
or damaged by the wind.
Remain in the lower levels of your home during the windstorm, and
avoid windows. Watch for falling debris and tree limbs. Use caution
if you must drive.
Rip Current Statement issued September 26 at 5:14AM EDT until September 27 at 8:00PM EDT by NWS Upton NY
Issued Until 27 hr 37 min left
Areas Southwest Suffolk, NY; Southern Nassau, NY
Full text
* WHAT...For the Coastal Flood Warning, one to two feet and
locally up to 2 1/2 feet of inundation above ground level in
vulnerable areas near the waterfront and shoreline. For the High
Surf Advisory, large breaking waves of 7 to 14 feet in the surf
zone. For the High Rip Current Risk, dangerous rip currents.
* WHERE...Southwest Suffolk and Southern Nassau Counties.
* WHEN...For the Coastal Flood Warning, until 6 PM EDT Sunday.
For the High Surf Advisory, until 8 PM EDT Sunday. For the
High Rip Current Risk, through Sunday evening.
* COASTAL FLOOD IMPACTS...Widespread moderate to major flooding of
vulnerable areas near the waterfront and shoreline. There is an
elevated threat to low lying properties. Flooding could extend
inland from the waterfront and shoreline into areas that
typically don't experience coastal flooding. Flooding will
likely be exacerbated along north facing shorelines from wave
action, particularly for the barrier island from Atlantic Beach,
Long Beach to Jones Beach. This will result in numerous road
closures and cause widespread flooding of low lying property
including parking lots, parks, lawns, and homes and businesses
with basements near the waterfront. Vehicles parked in
vulnerable areas near the waterfront will likely become flooded.
Flooding in the most vulnerable areas may not totally recede
during the times of low tide.
* SHOREFRONT AND BEACH IMPACTS...Breaking waves of 6 to 10 feet
along with elevated water levels will result in widespread dune
erosion and beach flooding. Localized overwashes are possible
where dune structures are compromised, resulting in some
flooding of roadways and vulnerable structures behind protective
dunes. Dangerous swimming and surfing conditions and localized
beach erosion. Life threatening rip currents are likely for all
people entering the surf zone. Anyone visiting the beaches
should stay out of the surf. Rip currents can sweep even the
best swimmers away from shore into deeper water.
What to do
Take the necessary actions to protect flood prone property. If
travel is required, do not drive around barricades or through
water of unknown depth.
Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.
High Surf Advisory issued September 26 at 5:14AM EDT until September 27 at 8:00PM EDT by NWS Upton NY
Issued Until 27 hr 37 min left
Areas Southwest Suffolk, NY; Southern Nassau, NY
Full text
* WHAT...For the Coastal Flood Warning, one to two feet and
locally up to 2 1/2 feet of inundation above ground level in
vulnerable areas near the waterfront and shoreline. For the High
Surf Advisory, large breaking waves of 7 to 14 feet in the surf
zone. For the High Rip Current Risk, dangerous rip currents.
* WHERE...Southwest Suffolk and Southern Nassau Counties.
* WHEN...For the Coastal Flood Warning, until 6 PM EDT Sunday.
For the High Surf Advisory, until 8 PM EDT Sunday. For the
High Rip Current Risk, through Sunday evening.
* COASTAL FLOOD IMPACTS...Widespread moderate to major flooding of
vulnerable areas near the waterfront and shoreline. There is an
elevated threat to low lying properties. Flooding could extend
inland from the waterfront and shoreline into areas that
typically don't experience coastal flooding. Flooding will
likely be exacerbated along north facing shorelines from wave
action, particularly for the barrier island from Atlantic Beach,
Long Beach to Jones Beach. This will result in numerous road
closures and cause widespread flooding of low lying property
including parking lots, parks, lawns, and homes and businesses
with basements near the waterfront. Vehicles parked in
vulnerable areas near the waterfront will likely become flooded.
Flooding in the most vulnerable areas may not totally recede
during the times of low tide.
* SHOREFRONT AND BEACH IMPACTS...Breaking waves of 6 to 10 feet
along with elevated water levels will result in widespread dune
erosion and beach flooding. Localized overwashes are possible
where dune structures are compromised, resulting in some
flooding of roadways and vulnerable structures behind protective
dunes. Dangerous swimming and surfing conditions and localized
beach erosion. Life threatening rip currents are likely for all
people entering the surf zone. Anyone visiting the beaches
should stay out of the surf. Rip currents can sweep even the
best swimmers away from shore into deeper water.
What to do
Take the necessary actions to protect flood prone property. If
travel is required, do not drive around barricades or through
water of unknown depth.
Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.
In the past year the National Weather Service issued 183 alerts for Nassau County, including 13 severe thunderstorm warnings, 6 flash flood warnings, 4 coastal flood warnings and 2 freeze warnings.
From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each links to the alert's own page, with its text, map, radar and sounding.
The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
Watch
Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
Advisory
A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
Statement
Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.
Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.
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