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Hydrograph
Weather Forecast Office Philadelphia/Mount Holly, NJ
Middle Atlantic River Forecast Center
Hydrograph
River at a Glance
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
Datum: Not Available
Metadata
NOTE:
Please refer to our
Coastal Hazard Message
for specific information regarding Coastal Flood Watches, Warnings and Advisories. Flood impacts are based on long-term averages. Actual impacts from any tidal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow. During tropical cyclones, please refer
here
for additional storm surge information.
NOTE: During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the
National Hurricane Center
reflects a plausible worst case scenario. The experimental forecast above is the total water forecast that is expected to occur.
NOTE:
Forecasts for the New Jersey Atlantic Coast at Atlantic City (ocean front) (IN MLLW) are issued routinely year-round.
Vertical Datum references a tidal datum (MLLW)...for more information see
Tides and Currents
.
Default Hydrograph
Scale to Flood Categories
Return to Area Map
Flood Categories (in feet)
Major Flood Stage:
8
Moderate Flood Stage:
7
Flood Stage:
6
Action Stage:
0
Low Stage (in feet):
-2
Historic Crests
(1) 8.98 ft on 12/11/1992
(2) 8.84 ft on 09/14/1944
(3) 8.76 ft on 10/29/2012
(4) 8.57 ft on 10/31/1991
(5) 8.57 ft on 09/27/1985
Show More Historic Crests
(P)
: Preliminary values subject to further review.
Recent Crests
(1) 7.10 ft on 10/29/2019
(2) 7.38 ft on 10/11/2019
(3) 7.57 ft on 10/27/2018
(4) 7.20 ft on 03/04/2018
(5) 7.01 ft on 05/25/2017
Show More Recent Crests
(P)
: Preliminary values subject to further review.
Low Water Records
(1) -5.24 ft on 01/10/1978
(2) -4.16 ft on 03/08/1932
(3) -4.06 ft on 01/25/1936
(4) -4.06 ft on 02/02/1976
(5) -3.96 ft on 01/31/1966
Show More Low Water Records
Zoom Level:16
Legend
FEMA Layer
Gauge Location
Disclaimer
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
If you notice any errors in the below information, please contact our
Webmaster
8.98
(Mean Lower Low Water (MLLW)) The level reached on December 11, 1992.
8.84
(MLLW) The level reached during the hurricane of September 14, 1944.
8.76
(MLLW) The level reached during Post Tropical Cyclone Sandy on October 29, 2012.
8.57
(MLLW) The level reached during Hurricane Gloria on September 27, 1985 and on October 31, 1991.
8.44
(MLLW) The level reached on March 6, 1962 and during Hurricane Belle on August 9, 1976.
8.24
(MLLW) The level reached on November 25, 1950.
8
(MLLW) MAJOR FLOODING. At this level, flooding starts to become severe enough to begin causing structural damage along with widespread flooding of roadways in Brigantine, Atantic City, Ventnor and Pleasantville. Vulnerable homes and businesses may be severely damaged or destroyed as water levels rise further above this threshold. Numerous roads become impassable and some neighborhoods may be isolated. The flood waters become a danger to anyone who attempts to cross on foot or in a vehicle.
7
(MLLW) MODERATE FLOODING. At this level, widespread flooding of roadways begins due to high water and/or wave action with many roads becoming impassable in Brigantine, Atlantic City, Ventnor and Pleasantville. Lives may be at risk when people put themselves in harm's way. Some damage to vulnerable structures may begin to occur. COASTAL FLOOD WARNING LEVEL.
6.8
(MLLW) Flooding begins in Pleasantville.
6.6
(MLLW) Flooding begins around Absecon Inlet in Atlantic City.
6.4
(MLLW) Flooding begins on the north end of Brigantine.
6.3
(MLLW) COASTAL FLOOD ADVISORY LEVEL.
6.2
(MLLW) Flooding begins on the White Horse Pike (US Route 30 - Absecon Boulevard) in Atlantic City, along the back bays in Atlantic City and Ventnor, and on the Black Horse Pike (US Routes 40 and 322) in West Atlantic City.
6
(MLLW) MINOR FLOODING.
5.8
(MLLW) Flooding begins at the most susceptible locations in West Atlantic City.
About This Location
Latitude: 39.350000° N, Longitude: 74.416667° W, Horizontal Datum: NAD83/WGS84
River Stage
Reference Frame
Gauge Height
Flood Stage
Uses
NWS stage
0 ft
6 ft
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum
Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88
-2.61
3.39
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
-1.99
1.40
NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)
Additional Information
All gage data is referenced in MLLW. During winter months, cold and ice may result in inaccurate real-time stages. Adjustments or deletions of this data can only be done after detailed analysis.
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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
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NWS Information
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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Page last modified: 1-Mar-2019 12:35 AM
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