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Hydrograph River at a Glance Download
Nantucket Harbor at Nantucket Tide Height (ft)Forecast: 3.3 ft 11:00AM Dec 14, 2017Forecast: 2.6 ft 12:00PM Dec 14, 2017Forecast: 1.8 ft 1:00PM Dec 14, 2017Forecast: 1 ft 2:00PM Dec 14, 2017Forecast: 0.6 ft 3:00PM Dec 14, 2017Forecast: 0.7 ft 4:00PM Dec 14, 2017Forecast: 1 ft 5:00PM Dec 14, 2017Forecast: 1.5 ft 6:00PM Dec 14, 2017Forecast: 2.1 ft 7:00PM Dec 14, 2017Forecast: 2.7 ft 8:00PM Dec 14, 2017Forecast: 3.1 ft 9:00PM Dec 14, 2017Forecast: 3.2 ft 10:00PM Dec 14, 2017Forecast: 3 ft 11:00PM Dec 14, 2017Forecast: 2.6 ft 12:00AM Dec 15, 2017Forecast: 1.9 ft 1:00AM Dec 15, 2017Forecast: 1.3 ft 2:00AM Dec 15, 2017Forecast: 0.9 ft 3:00AM Dec 15, 2017Forecast: 1 ft 4:00AM Dec 15, 2017Forecast: 1.3 ft 5:00AM Dec 15, 2017Forecast: 1.9 ft 6:00AM Dec 15, 2017Forecast: 2.5 ft 7:00AM Dec 15, 2017Forecast: 3.1 ft 8:00AM Dec 15, 2017Forecast: 3.6 ft 9:00AM Dec 15, 2017Highest Forecast: 3.8 ft 10:00AM Dec 15, 2017Forecast: 3.7 ft 11:00AM Dec 15, 2017Forecast: 3.2 ft 12:00PM Dec 15, 2017Forecast: 2.5 ft 1:00PM Dec 15, 2017Forecast: 1.6 ft 2:00PM Dec 15, 2017Forecast: 0.9 ft 3:00PM Dec 15, 2017Forecast: 0.6 ft 4:00PM Dec 15, 2017Forecast: 0.7 ft 5:00PM Dec 15, 2017Forecast: 1.1 ft 6:00PM Dec 15, 2017Forecast: 1.6 ft 7:00PM Dec 15, 2017Forecast: 2.2 ft 8:00PM Dec 15, 2017Forecast: 2.7 ft 9:00PM Dec 15, 2017Forecast: 3.1 ft 10:00PM Dec 15, 2017Forecast: 3.1 ft 11:00PM Dec 15, 2017Forecast: 2.9 ft 12:00AM Dec 16, 2017Forecast: 2.5 ft 1:00AM Dec 16, 2017Forecast: 1.8 ft 2:00AM Dec 16, 2017Forecast: 1.2 ft 3:00AM Dec 16, 2017Forecast: 0.9 ft 4:00AM Dec 16, 2017Forecast: 1.1 ft 5:00AM Dec 16, 2017Forecast: 1.5 ft 6:00AM Dec 16, 2017Forecast: 2.1 ft 7:00AM Dec 16, 2017Forecast: 2.7 ft 8:00AM Dec 16, 2017Forecast: 3.3 ft 9:00AM Dec 16, 2017Forecast: 3.7 ft 10:00AM Dec 16, 2017Highest Forecast: 3.8 ft 11:00AM Dec 16, 2017Forecast: 3.6 ft 12:00PM Dec 16, 2017Forecast: 3 ft 1:00PM Dec 16, 2017Forecast: 2.2 ft 2:00PM Dec 16, 2017Forecast: 1.3 ft 3:00PM Dec 16, 2017Forecast: 0.7 ft 4:00PM Dec 16, 2017Forecast: 0.6 ft 5:00PM Dec 16, 2017Forecast: 0.8 ft 6:00PM Dec 16, 2017Forecast: 1.1 ft 7:00PM Dec 16, 2017Forecast: 1.7 ft 8:00PM Dec 16, 2017Forecast: 2.3 ft 9:00PM Dec 16, 2017Forecast: 2.8 ft 10:00PM Dec 16, 2017Forecast: 3.1 ft 11:00PM Dec 16, 2017Forecast: 3.1 ft 12:00AM Dec 17, 2017Forecast: 2.8 ft 1:00AM Dec 17, 2017Forecast: 2.3 ft 2:00AM Dec 17, 2017Forecast: 1.6 ft 3:00AM Dec 17, 2017Data courtesy of NOAA National Ocean ServiceNTKM3(plotting HMIRG) Graph Created (10:00AM Dec 14, 2017)ObservedForecast (issued 4:17AM Dec 14)Latest observed value: 2.86 ft at 5:24 AM EST 11-Dec-2017. Flood Stage is 5 ft
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Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
NOTE: Coastal flood impacts are dependent upon waves as well as tide level. High waves can result in flooding even if the tide level is below flood stage.

NOTE: Forecasts for the Nantucket Harbor at Nantucket are issued routinely year-round.

Vertical Datum references a tidal datum...for more information see Tides and Currents .

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Flood Categories (in feet)
Major Flood Stage: 8
Moderate Flood Stage: 6
Flood Stage: 5
Action Stage: 4
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:16
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
10 Signifcant flooding is expected in low lying portions of Nantucket. Road closures and some evacuations can be expected. Large surf will also result in beach erosion in vulnerable areas.
8 Flooding of low lying areas on Nantucket is likely. Flooding will impact both the Nantucket Harbor region as well as the Atlantic Avenue area on the south side of the Island. Some localized evacuations may be necessary.
6 Moderate flooding of Nantucket Harbor is expected. Some low lying coastal roads will experience during the time nearest high tide.
4.5 Minor coastal flooding begins on Easy Street in Nantucket.
(1) Nantucket Tidal Station
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Latitude: 41.285000° N, Longitude: 70.096667° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available 6 MLLW
Additional Information Collapse
Nantucket Harbor gage data and forecasts are in feet Mean Lower Low Water (MLLW).
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Hydrologic Resources Additional Resources
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Boston Weather Forecast Office
445 Myles Standish Blvd
Taunton, MA 02780
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