NWS New York, NY Coastal Flooding Page

Tidal Observations	Coastal Flood Thresholds, Impacts and Analysis	Surge Models
Astronomical Tidal Predictions	Inundation/Impact Resources	Latest Coastal Flood Forecasts

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LATEST COASTAL FLOOD FORECASTS

NYCCFWOKX	Coastal Flood WATCH / WARNING / Advisory	Latest
NYCHWOOKX	Hazardous Weather OUTLOOK	Latest

Understanding the Minor, Moderate, Major Coastal Flood Thresholds

Understanding Coastal Flood Terminology

How to Visualize the Impacts of NWS Coastal Flood Forecasts!

TIDAL OBSERVATIONS

COASTAL FLOODING THRESHOLDS, IMPACTS and ANALYSIS

Long Island Sound
Station	Coastal Flood Benchmarks (MLLW / MHHW / NGVD)	Tidal Impacts/Analysis
Connecticut
Bridgeport (NOS) 72 hr Fcst Hydrograph	Minor -8.9' / 1.6' Moderate - 10.4' / 3.1' Major - 11.4 ' / 4.1' MLLW - 3.6' = MSL MLLW - 7.3' = MHHW	Impacts Top 20 list Exceedance Probabilities
New Haven (NOS)	Minor - 8.6' / 1.9' Moderate - 9.2' / 2.5' Major - 10.5' / 3.8' MLLW - 3.3' = MSL MLLW - 6.7' = MHHW	Impacts
New London (NOS) 72 hr Fcst Hydrograph	Minor -5.0' / 1.9' Moderate - 6.0' / 2.9' Major - 7.8' / 4.7' MLLW - 1.5' = MSL MLLW - 3.1' = MHHW	Impacts Top 20 list Exceedance Probabilities
Stamford (USACE) Site ID# 01209788	Minor -9.4' / 1.5' / 6.4' Close Hurr. Barrier -10.0' / 2.1' / 7.0' Moderate - 11.0' / 3.1' / 8.0' Major - 12.4' / 4.5' / 9.4' Overtop Hurr. Barrier -20.0' / 12.1 ' / 17.0' MLLW - 3.0' = NGVD MLLW - 7.9' = MHHW	Impacts Top 20 list
New York
Old Field (USGS) Site ID# 01304057	Minor - 9.2' / 1.9' / 6.5' Moderate - 10.2' / 2.9' / 7.5' Major - 12.2' / 4.9' / 9.5' MLLW - 2.7' = NGVD MLLW - 7.3' = MHHW	Impacts Exceedance Probabilities
Kings Point (NOS) 72 hr Fcst Hydrograph	Minor - 10.0' / 2.2' NYC Minor - 10.5' / 2.7' Moderate - 10.5' / 2.7' NYC Moderate - 11.0' / 3.2' Major - 13.0' / 5.2' MLLW - 3.9' = MSL MLLW - 7.8' = MHHW MLLW - 4.0' = NAVD MHHW + 3.9' = NAVD	Impacts Top 20 list Exceedance Probabilities
West Pond (Glen Cove) (USGS) Site ID# 01302600	Minor - 10.1' / 2.2' / 7.0' Moderate - 11.1' / 3.2' / 8.0' Major - 13.1' / 5.2' / 10.0' MLLW - 3.1' = NGVD MLLW - 7.9' = MHHW	Impacts Exceedance Probabilities

Hudson River
Station	Coastal Flood Benchmarks (MLLW / MHHW / NGVD)	Tidal Impacts/Analysis
Piermont (USGS) Site ID# 01376269	Minor - 6.4' / 2.4' / 5.5' Moderate - 7.4' / 3.4' / 6.5' Major - 8.4' / 4.4' / 7.5' MLLW - 0.9' = NGVD MLLW - 4.0' = MHHW	Impacts

New York Harbor
Station	Coastal Flood Benchmarks (MLLW / MHHW / NGVD / NAVD)	Tidal Impacts/Analysis
New York
Battery (NOS) 72 hr Fcst Hydrograph	Minor - 7.2' / 2.1' Moderate - 8.5' / 3.4' Start to overtop seawall - 9.0' / 3.9' Major - 9.6' / 4.6' MLLW - 2.6' = MSL MLLW - 5.0' = MHHW MLLW - 2.8' = NAVD MHHW + 2.2' = NAVD	Impacts Top 20 list Exceedance Probabilities
Bergen Point (NOS) 72 hr Fcst Hydrograph	Minor - 7.2' / 1.7' Moderate - 8.5' / 3.0' Major - 9.6' / 4.1' MLLW - 2.8' = MSL MLLW - 5.5' = MHHW	Impacts
Great Kills Harbor (USGS) Site ID# 01376562	Minor - 7.2' / 1.9' / 5.5' Moderate - 8.2' / 2.9' / 6.5' Major - 9.2' / 3.9' / 7.5' MLLW - 1.7' = NGVD MLLW - 5.3' = MHHW
New Jersey
Sandy Hook (NOS) 72 hr Fcst Hydrograph	Minor - 7.0' / 1.8' Moderate - 7.7' / 2.5' Major - 8.7' / 3.5' MLLW - 2.6' = MSL MLLW - 5.2' = MHHW	Impacts

South Shore of NYC/LI and Eastern LI
Station	Coastal Flood Benchmarks (MLLW / MHHW / NGVD / NAVD)	Tidal Impacts/Analysis
South Shore Bays
Rockaway Inlet (USGS) Site ID# 01311875	QNS Minor - 7.3' / 1.8' / 5.5' / 4.4' BKN Minor - 7.8' / 2.3' / 6.0' / 4.9' Moderate - 8.3' / 2.8' / 6.5' / 5.4' Major - 9.3' / 3.8' / 7.5' / 6.4' MLLW - 1.8' = NGVD MLLW - 5.6' = MHHW MLLW - 2.9' = NAVD MHHW + 2.6' = NAVD	Impacts Exceedance Probabilities
Jamaica Bay (USGS) Site ID# 01311850	Qns Minor - 7.5' / 1.6' / 5.5'/ 4.4' Moderate - 8.2' / 2.3' / 6.2' / 5.1' Major - 9.0' / 3.1' / 7.0' / 5.9' MLLW - 2.0' = NGVD MLLW - 5.9' = MHHW MLLW - 3.1' = NAVD MHHW + 2.8' = NAVD	Impacts Exceedance Probabilities Coastal Flood Vulnerability
East Rockaway Inlet (USGS) Site ID# 01311145	Minor - 6.0' / 1.0' / 4.5' Moderate - 7.0' / 2.0' / 5.5' Major - 8.0' / 3.0' / 6.5' MLLW - 1.5' = NGVD MLLW - 5.0' = MHHW	Impacts Exceedance Probabilities
Freeport (USGS) Site ID# 01310521	Minor - 6.0' / 1.4' / 4.5' Moderate - 6.5' / 1.9' / 5.0' Major - 7.2' / 2.6' / 5.7' MLLW - 1.5' = NGVD MLLW - 4.6' = MHHW	Impacts Exceedance Probabilities Top 20 list
Hog Island (USGS) Site ID# 01311143	Minor - 6.0' / 1.0' / 4.5' Moderate - 7.0' / 2.0' / 5.5' Major - 8.0' / 3.0' / 6.5' MLLW - 1.5' = NGVD MLLW - 5.0' = MHHW
Reynolds Channel (USGS) Site ID# 01310740	Minor - 5.8' / 1.1' / 4.5' Moderate - 6.8' / 2.1' / 5.5' Major - 7.8' / 3.1' / 6.5' MLLW - 1.3' = NGVD MLLW - 4.7' = MHHW	Impacts Exceedance Probabilities
Lindenhurst (USGS) Site ID# 01309225	Minor - 3.1' / 1.6' / 3.5' Moderate - 3.6' / 2.1' / 4.0' Major - 4.1' / 2.6' / 4.5' MLLW + 0.4' = NGVD MLLW - 1.5' = MHHW	Impacts Exceedance Probabilities
West Sayville (USGS) Site ID# 01306402	Minor - 3.0' / 1.7' / 3.5' Moderate - 3.5' / 2.2' / 4.0' Major - 4.0' / 2.7' / 4.5' MLLW + 0.5' = NGVD MLLW - 1.3' = MHHW
Watch Hill, Fire I. (USGS) Site ID# 01305575	Minor - 3.1' / 1.7' / 3.5' Moderate - 3.6' / 2.2' / 4.0' Major - 4.1' / 2.7' / 4.5' MLLW + 0.4' = NGVD MLLW - 1.4' = MHHW	Impacts
Smith Point Bridge (LIShore)
Moriches Bay (USGS) Site ID# 01304920	Minor - 4.4' / 1.8' / 4.0' Moderate - 5.4' / 2.8' / 5.0' Major - 6.4' / 3.8' / 6.0' MLLW - 0.4' = NGVD MLLW - 2.6' = MHHW	Impacts
Shinnecock Bay at Ponquogue NY (USGS) Site ID# 01304746	Minor - 4.9' / 1.7' / 4.0' Moderate - 5.9' / 2.7' / 5.0' Major - 6.9' / 3.7' / 6.0' MLLW - 0.9' = NGVD MLLW - 3.2' = MHHW	Impacts
East Hampton (SUNYSB)
Eastern LI
Montauk Point (NOS) 72 hr Fcst Hydrograph	Minor - 4.5' / 2.0' Moderate - 5.3' / 2.8' Major - 7.0' / 4.5' MLLW - 1.2' = MSL MLLW - 2.5' = MHHW	Impacts Top 20 list Exceedance Probabilities
Orient Harbor (USGS) Site ID# 01304200	Minor - 4.7' / 1.9' / 4' Moderate - 5.7' / 2.9' / 5' Major - 6.7' / 3.9' / 6' MLLW - .7' = NGVD MLLW - 2.8' = MHHW	Impacts
Riverhead (USGS) Site ID# 01304562	Minor - 5.6' / 2.3' / 4.5' Moderate - 6.3' / 3.0' / 5.2' Major - 7.1' / 3.8' / 6' MLLW - 1.1' = NGVD MLLW - 3.3' = MHHW	Impacts

STORM SURGE GUIDANCE

Extratropical

ETSS (Extratropical Water Level Forecast) - GFS and SLOSH Model
- Developmental ETSS 2.1 Website
- Graphical - (Plan View)
- Text Product - (MRPSSE - raw GFS guidance)
PETSS (Probabilistic Extratropical Storm Surge 1.0) - GEFS and SLOSH Model
ESTOFS(Extratropical Surge and Tide Operational Forecast System) - GFS and ADCIRC Model
- ESTOFS (Extratropical Surge and Tide Operational Forecast System) - (Plan View)
Stony Brook WRF Ensemble Surge Predictions - WRF ensemble and ADCIRC Model
New York and New Jersey Operational Forecast System (NYOFS) - Princeton Ocean Model with ETSS, PORTS data, and NAM-12 winds

Extratropical and Tropical

Stevens Institute Flood Advisory System - 100 Dynamic Member Ensemble and Stevens Estuarine and Coastal Ocean Model

Tropical

Probabalistic Hurricane Storm Surge
Probabalistic Hurricane Storm Surge 2.0 (Experimental)
Ensemble of SLOSH model runs using the current National Hurricane Center (NHC) official hurricane advisory

TIDAL PREDICTIONS

NOAA Tide Predictions

East End
- Montauk, NY
- Riverhead at Peconic River, NY
- Orient Harbor, NY

New York Harbor
- Hudson River at Piermont
- The Battery, NY
- Bergen Point West Reach, NY
- Great Kills Harbor at Great Kills
- Sandy Hook, NJ

South Shore Of NYC/LI Back Bays
Long Island Sound
- Bridgeport, CT
- Kings Point, NY
- New Haven, CT
- New London, CT
- Old Field, NY
- Stamford Hurricane Barrier, CT
- West Pond at Glen Cove, NY

INUNDATION AND IMPACT RESOURCES


OCM Sea Level Rise Viewer	OCM Coastal Flood Exposure Mapper	Climate Central - Surging Seas Coastal Mapping Tools	USGS Coastal Change Hazards