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ALL DATA ARE EASTERN STANDARD TIME

USGS 01305575 GREAT SOUTH BAY AT WATCH HILL ON FIRE ISLAND NY

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION.--Lat 40°41'29.0", long 72°59'22.9" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at National Park Service Watch Hill Marina, on Fire Island.
PERIOD OF RECORD.--March 2016 to current year.
GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929.
REMARKS.--Satellite and telephone elevation telemeters at station.
EXTREMES OUTSIDE PERIOD OF RECORD.--Storm tide of Oct. 30, 2012, reached an elevation of 6.7 ft, from high-water mark at site 3.7 mi northwest.


Elevation observations and tidal predictions for this station are reported to NGVD 1929. To convert data to NAVD 1988 subtract 1.06 ft. To convert data to MHHW datum subtract 1.77 ft. To convert data to MLLW datum subtract 0.36 ft. These corrections vary from site to site.

NGVD 1929 is the National Geodetic Vertical Datum of 1929, formerly called "mean sea level" or "Sea Level Datum of 1929." NGVD 1929 was a general adjustment of the first-order level nets fit to mean sea level at 26 tide gages in the US and Canada.
NAVD 1988 is the North American Vertical Datum of 1988, which is a geodetic datum derived from a general adjustment of the first-order level nets fit to 1 tide gage in eastern Canada.
MHHW is mean higher high water, which is a site-specific datum determined by averaging the highest of the 2 high tides that occur each day over a 19-year tidal epoch. For tide gages with less than 19 years of record, this datum is estimated by correlation with long-term tide gages.
MLLW is mean lower low water, which is a site-specific datum determined by averaging the lowest of the 2 low tides that occur each day over a 19-year tidal epoch. For tide gages with less than 19 years of record, this datum is estimated by correlation with long-term tide gages.


Additional sensor graph(s) available (click on graph or sensor name)

Water elevation, astronomical-tide elevation, and residual water level

Water elevation, astronomical-tide elevation, and residual water level Graph updated every 15 minutes

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Gage PhotoStation image

 

This station managed by the NY Water Science Center Coram.

Available Parameters Available Period
All 12 Available Parameters for this site
  
00020 Temperature, air 2018-03-22  2018-07-20
00036 Wind direction 2018-03-22  2018-07-20
00045 Precipitation 2018-03-22  2018-07-20
00052 Relative humidity 2018-03-22  2018-07-20
61727 Wind gust speed 2018-03-22  2018-07-20
61729 Wind gust direction 2018-03-22  2018-07-20
62608 Solar radiation down 2018-03-22  2018-07-20
62619 Elevation, ocean/est 2016-04-18  2018-07-20
62619 Elevation, ocean/est, tidal prediction 2018-03-22  2018-09-30
75969 BarometricPressUncor 2018-03-22  2018-07-20
82127 Wind speed 2018-03-22  2018-07-20
99067 Observed elev diff 2018-03-22  2018-07-20

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Summary of all available data for this site
Instantaneous-data availability statement


Temperature, air, degrees Celsius

Most recent instantaneous value: 23.7 07-20-2018   18:42 EST
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Wind direction, degrees clockwise from true north

Most recent instantaneous value: 185 07-20-2018   19:00 EST
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Precipitation, total, inches

Most recent instantaneous value: 0.00 07-20-2018   19:00 EST
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Relative humidity, percent

Most recent instantaneous value: 59.4 07-20-2018   18:42 EST
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Wind gust speed, air, knots

Most recent instantaneous value: 7.600 07-20-2018   18:42 EST
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Wind gust direction, air, degrees clockwise from true north

Most recent instantaneous value: 187 07-20-2018   18:42 EST
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Total solar radiation (direct + diffuse radiation on a horizontal surface), watts per square meter

Most recent instantaneous value: 30 07-20-2018   18:42 EST
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Estuary or ocean water surface elevation above NGVD 1929, feet

Most recent instantaneous value: 1.65 07-20-2018   19:00 EST
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Estuary or ocean water surface elevation above NGVD 1929, feet, tidal prediction

Most recent instantaneous value: 1.38 07-20-2018   19:36 EST
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Barometric pressure, not corrected to sea level, millibars

Most recent instantaneous value: 1020 07-20-2018   18:42 EST
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Wind speed, knots

Most recent instantaneous value: 5.00 07-20-2018   19:00 EST
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Difference between observed and predicted water surface elevation, feet

Most recent instantaneous value: 0.16 07-20-2018   19:00 EST
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