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Weather Forecast Office (Baltimore/Washington) Sterling, VA Middle Atlantic River Forecast Center

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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels
Chance of Exceeding Levels
During Entire Period
Potomac River at Hancock Observed crest: 5.16 ft at 3:15am Nov 22 Observed: 4.12 ft at 12:15am Nov 21 Observed: 4.13 ft at 12:30am Nov 21 Observed: 4.14 ft at 12:45am Nov 21 Observed: 4.14 ft at 1:00am Nov 21 Observed: 4.15 ft at 1:15am Nov 21 Observed: 4.16 ft at 1:30am Nov 21 Observed: 4.17 ft at 1:45am Nov 21 Observed: 4.17 ft at 2:00am Nov 21 Observed: 4.19 ft at 2:15am Nov 21 Observed: 4.19 ft at 2:30am Nov 21 Observed: 4.2 ft at 2:45am Nov 21 Observed: 4.21 ft at 3:00am Nov 21 Observed: 4.22 ft at 3:15am Nov 21 Observed: 4.23 ft at 3:30am Nov 21 Observed: 4.24 ft at 3:45am Nov 21 Observed: 4.26 ft at 4:00am Nov 21 Observed: 4.28 ft at 4:15am Nov 21 Observed: 4.3 ft at 4:30am Nov 21 Observed: 4.33 ft at 4:45am Nov 21 Observed: 4.36 ft at 5:00am Nov 21 Observed: 4.4 ft at 5:15am Nov 21 Observed: 4.44 ft at 5:30am Nov 21 Observed: 4.48 ft at 5:45am Nov 21 Observed: 4.53 ft at 6:00am Nov 21 Observed: 4.56 ft at 6:15am Nov 21 Observed: 4.6 ft at 6:30am Nov 21 Observed: 4.64 ft at 6:45am Nov 21 Observed: 4.68 ft at 7:00am Nov 21 Observed: 4.72 ft at 7:15am Nov 21 Observed: 4.74 ft at 7:30am Nov 21 Observed: 4.77 ft at 7:45am Nov 21 Observed: 4.8 ft at 8:00am Nov 21 Observed: 4.82 ft at 8:15am Nov 21 Observed: 4.84 ft at 8:30am Nov 21 Observed: 4.86 ft at 8:45am Nov 21 Observed: 4.87 ft at 9:00am Nov 21 Observed: 4.89 ft at 9:15am Nov 21 Observed: 4.9 ft at 9:30am Nov 21 Observed: 4.91 ft at 9:45am Nov 21 Observed: 4.92 ft at 10:00am Nov 21 Observed: 4.93 ft at 10:15am Nov 21 Observed: 4.94 ft at 10:30am Nov 21 Observed: 4.94 ft at 10:45am Nov 21 Observed: 4.95 ft at 11:00am Nov 21 Observed: 4.96 ft at 11:15am Nov 21 Observed: 4.96 ft at 11:30am Nov 21 Observed: 4.96 ft at 11:45am Nov 21 Observed: 4.96 ft at 12:00pm Nov 21 Observed: 4.97 ft at 12:15pm Nov 21 Observed: 4.97 ft at 12:30pm Nov 21 Observed: 4.97 ft at 12:45pm Nov 21 Observed: 4.97 ft at 1:00pm Nov 21 Observed: 4.97 ft at 1:15pm Nov 21 Observed: 4.97 ft at 1:30pm Nov 21 Observed: 4.97 ft at 1:45pm Nov 21 Observed: 4.97 ft at 2:00pm Nov 21 Observed: 4.97 ft at 2:15pm Nov 21 Observed: 4.97 ft at 2:30pm Nov 21 Observed: 4.97 ft at 2:45pm Nov 21 Observed: 4.97 ft at 3:00pm Nov 21 Observed: 4.97 ft at 3:15pm Nov 21 Observed: 4.97 ft at 3:30pm Nov 21 Observed: 4.97 ft at 3:45pm Nov 21 Observed: 4.97 ft at 4:00pm Nov 21 Observed: 4.97 ft at 4:15pm Nov 21 Observed: 4.97 ft at 4:30pm Nov 21 Observed: 4.97 ft at 4:45pm Nov 21 Observed: 4.97 ft at 5:00pm Nov 21 Observed: 4.97 ft at 5:15pm Nov 21 Observed: 4.97 ft at 5:30pm Nov 21 Observed: 4.97 ft at 5:45pm Nov 21 Observed: 4.97 ft at 6:00pm Nov 21 Observed: 4.97 ft at 6:15pm Nov 21 Observed: 4.97 ft at 6:30pm Nov 21 Observed: 4.97 ft at 6:45pm Nov 21 Observed: 4.97 ft at 7:00pm Nov 21 Observed: 4.97 ft at 7:15pm Nov 21 Observed: 4.97 ft at 7:30pm Nov 21 Observed: 4.97 ft at 7:45pm Nov 21 Observed: 4.97 ft at 8:00pm Nov 21 Observed: 4.98 ft at 8:15pm Nov 21 Observed: 4.98 ft at 8:30pm Nov 21 Observed: 4.98 ft at 8:45pm Nov 21 Observed: 4.99 ft at 9:00pm Nov 21 Observed: 4.99 ft at 9:15pm Nov 21 Observed: 4.99 ft at 9:30pm Nov 21 Observed: 5 ft at 9:45pm Nov 21 Observed: 5.01 ft at 10:00pm Nov 21 Observed: 5.01 ft at 10:15pm Nov 21 Observed: 5.02 ft at 10:30pm Nov 21 Observed: 5.03 ft at 10:45pm Nov 21 Observed: 5.04 ft at 11:00pm Nov 21 Observed: 5.05 ft at 11:15pm Nov 21 Observed: 5.05 ft at 11:30pm Nov 21 Observed: 5.06 ft at 11:45pm Nov 21 Observed: 5.07 ft at 12:00am Nov 22 Observed: 5.08 ft at 12:15am Nov 22 Observed: 5.09 ft at 12:30am Nov 22 Observed: 5.1 ft at 12:45am Nov 22 Observed: 5.11 ft at 1:00am Nov 22 Observed: 5.11 ft at 1:15am Nov 22 Observed: 5.12 ft at 1:30am Nov 22 Observed: 5.13 ft at 1:45am Nov 22 Observed: 5.13 ft at 2:00am Nov 22 Observed: 5.14 ft at 2:15am Nov 22 Observed: 5.14 ft at 2:30am Nov 22 Observed: 5.15 ft at 2:45am Nov 22 Observed: 5.15 ft at 3:00am Nov 22 Observed: 5.16 ft at 3:15am Nov 22 Observed: 5.16 ft at 3:30am Nov 22 Observed: 5.16 ft at 3:45am Nov 22 Observed: 5.16 ft at 4:00am Nov 22 Observed: 5.16 ft at 4:15am Nov 22 Observed: 5.16 ft at 4:30am Nov 22 Observed: 5.16 ft at 4:45am Nov 22 Observed: 5.16 ft at 5:00am Nov 22 Observed: 5.16 ft at 5:15am Nov 22 Observed: 5.16 ft at 5:30am Nov 22 Observed: 5.16 ft at 5:45am Nov 22 Observed: 5.16 ft at 6:00am Nov 22 Observed: 5.16 ft at 6:15am Nov 22 Observed: 5.16 ft at 6:30am Nov 22 Observed: 5.16 ft at 6:45am Nov 22 Observed: 5.15 ft at 7:00am Nov 22 Observed: 5.15 ft at 7:15am Nov 22 Observed: 5.15 ft at 7:30am Nov 22 Observed: 5.14 ft at 7:45am Nov 22 Observed: 5.14 ft at 8:00am Nov 22 Observed: 5.14 ft at 8:15am Nov 22 Observed: 5.13 ft at 8:30am Nov 22 Observed: 5.13 ft at 8:45am Nov 22 Observed: 5.13 ft at 9:00am Nov 22 Observed: 5.12 ft at 9:15am Nov 22 Observed: 5.12 ft at 9:30am Nov 22 Observed: 5.12 ft at 9:45am Nov 22 Observed: 5.11 ft at 10:00am Nov 22 Observed: 5.11 ft at 10:15am Nov 22 Observed: 5.1 ft at 10:30am Nov 22 Observed: 5.1 ft at 10:45am Nov 22 Observed: 5.09 ft at 11:00am Nov 22 Observed: 5.09 ft at 11:15am Nov 22 Observed: 5.09 ft at 11:30am Nov 22 Observed: 5.08 ft at 11:45am Nov 22 Observed: 5.08 ft at 12:00pm Nov 22 Observed: 5.07 ft at 12:15pm Nov 22 Observed: 5.07 ft at 12:30pm Nov 22 Observed: 5.07 ft at 12:45pm Nov 22 Observed: 5.07 ft at 1:00pm Nov 22 Observed: 5.06 ft at 1:15pm Nov 22 Observed: 5.06 ft at 1:30pm Nov 22 Observed: 5.06 ft at 1:45pm Nov 22 Observed: 5.04 ft at 2:00pm Nov 22 Observed: 5.04 ft at 2:15pm Nov 22 Observed: 5.04 ft at 2:30pm Nov 22 Observed: 5.04 ft at 2:45pm Nov 22 Observed: 5.03 ft at 3:00pm Nov 22 Observed: 5.03 ft at 3:15pm Nov 22 Observed: 5.02 ft at 3:30pm Nov 22 Observed: 5.02 ft at 3:45pm Nov 22 Observed: 5.02 ft at 4:00pm Nov 22 Observed: 5.01 ft at 4:15pm Nov 22 Observed: 5.01 ft at 4:30pm Nov 22 Observed: 5 ft at 4:45pm Nov 22 Observed: 5 ft at 5:00pm Nov 22 Observed: 4.99 ft at 5:15pm Nov 22 Observed: 4.99 ft at 5:30pm Nov 22 Observed: 4.98 ft at 5:45pm Nov 22 Observed: 4.98 ft at 6:00pm Nov 22 Observed: 4.98 ft at 6:15pm Nov 22 Observed: 4.97 ft at 6:30pm Nov 22 Observed: 4.96 ft at 6:45pm Nov 22 Observed: 4.96 ft at 7:00pm Nov 22 Observed: 4.96 ft at 7:15pm Nov 22 Observed: 4.95 ft at 7:30pm Nov 22 Observed: 4.95 ft at 7:45pm Nov 22 Observed: 4.94 ft at 8:00pm Nov 22 Observed: 4.94 ft at 8:15pm Nov 22 Observed: 4.93 ft at 8:30pm Nov 22 Observed: 4.93 ft at 8:45pm Nov 22 Observed: 4.92 ft at 9:00pm Nov 22 Observed: 4.92 ft at 9:15pm Nov 22 Observed: 4.92 ft at 9:30pm Nov 22 Observed: 4.91 ft at 9:45pm Nov 22 Observed: 4.91 ft at 10:00pm Nov 22 Observed: 4.9 ft at 10:15pm Nov 22 Observed: 4.9 ft at 10:30pm Nov 22 Observed: 4.89 ft at 10:45pm Nov 22 Observed: 4.89 ft at 11:00pm Nov 22 Observed: 4.89 ft at 11:15pm Nov 22 Observed: 4.88 ft at 11:30pm Nov 22 Observed: 4.88 ft at 11:45pm Nov 22 Observed: 4.88 ft at 12:00am Nov 23 Observed: 4.87 ft at 12:15am Nov 23 Observed: 4.87 ft at 12:30am Nov 23 Observed: 4.86 ft at 12:45am Nov 23 Observed: 4.86 ft at 1:00am Nov 23 Observed: 4.85 ft at 1:15am Nov 23 Observed: 4.85 ft at 1:30am Nov 23 Observed: 4.84 ft at 1:45am Nov 23 Observed: 4.84 ft at 2:00am Nov 23 Observed: 4.84 ft at 2:15am Nov 23 Observed: 4.83 ft at 2:30am Nov 23 Observed: 4.83 ft at 2:45am Nov 23 Observed: 4.82 ft at 3:00am Nov 23 Observed: 4.82 ft at 3:15am Nov 23 Observed: 4.81 ft at 3:30am Nov 23 Observed: 4.81 ft at 3:45am Nov 23 Observed: 4.81 ft at 4:00am Nov 23 Observed: 4.8 ft at 4:15am Nov 23 Observed: 4.8 ft at 4:30am Nov 23 Observed: 4.8 ft at 4:45am Nov 23 Observed: 4.79 ft at 5:00am Nov 23 Observed: 4.79 ft at 5:15am Nov 23 Observed: 4.78 ft at 5:30am Nov 23 Observed: 4.78 ft at 5:45am Nov 23 Observed: 4.77 ft at 6:00am Nov 23 Observed: 4.77 ft at 6:15am Nov 23 Observed: 4.77 ft at 6:30am Nov 23 Observed: 4.76 ft at 6:45am Nov 23 Observed: 4.76 ft at 7:00am Nov 23 Observed: 4.76 ft at 7:15am Nov 23 Observed: 4.75 ft at 7:30am Nov 23 Observed: 4.75 ft at 7:45am Nov 23 Observed: 4.74 ft at 8:00am Nov 23 Observed: 4.74 ft at 8:15am Nov 23 Observed: 4.74 ft at 8:30am Nov 23 Observed: 4.73 ft at 8:45am Nov 23 Observed: 4.73 ft at 9:00am Nov 23 Observed: 4.73 ft at 9:15am Nov 23 Observed: 4.72 ft at 9:30am Nov 23 Observed: 4.72 ft at 9:45am Nov 23 Observed: 4.72 ft at 10:00am Nov 23 Observed: 4.71 ft at 10:15am Nov 23 Observed: 4.71 ft at 10:30am Nov 23 Observed: 4.7 ft at 10:45am Nov 23 Observed: 4.7 ft at 11:00am Nov 23 Observed: 4.7 ft at 11:15am Nov 23 Observed: 4.69 ft at 11:30am Nov 23 Observed: 4.69 ft at 11:45am Nov 23 Observed: 4.68 ft at 12:00pm Nov 23 Observed: 4.68 ft at 12:15pm Nov 23 Observed: 4.67 ft at 12:45pm Nov 23 Observed: 4.67 ft at 1:00pm Nov 23 Observed: 4.67 ft at 1:15pm Nov 23 Observed: 4.66 ft at 1:30pm Nov 23 Observed: 4.66 ft at 1:45pm Nov 23 Observed: 4.65 ft at 2:00pm Nov 23 Observed: 4.65 ft at 2:15pm Nov 23 Observed: 4.65 ft at 2:30pm Nov 23 Observed: 4.64 ft at 2:45pm Nov 23 Observed: 4.64 ft at 3:00pm Nov 23 Observed: 4.64 ft at 3:15pm Nov 23 Observed: 4.64 ft at 3:30pm Nov 23 Observed: 4.64 ft at 3:45pm Nov 23 Observed: 4.63 ft at 4:00pm Nov 23 Observed: 4.63 ft at 4:15pm Nov 23 Observed: 4.63 ft at 4:30pm Nov 23 Observed: 4.63 ft at 4:45pm Nov 23 Observed: 4.63 ft at 5:00pm Nov 23 Observed: 4.62 ft at 5:15pm Nov 23 Observed: 4.62 ft at 5:30pm Nov 23 Observed: 4.62 ft at 5:45pm Nov 23 Observed: 4.61 ft at 6:00pm Nov 23 Observed: 4.61 ft at 6:15pm Nov 23 Observed: 4.61 ft at 6:30pm Nov 23 Observed: 4.6 ft at 6:45pm Nov 23 Observed: 4.6 ft at 7:00pm Nov 23 Observed: 4.6 ft at 7:15pm Nov 23 Observed: 4.59 ft at 8:30pm Nov 23 Observed: 4.59 ft at 8:45pm Nov 23 Observed: 4.59 ft at 9:00pm Nov 23 Observed: 4.59 ft at 9:15pm Nov 23 Observed: 4.59 ft at 9:30pm Nov 23 Observed: 4.59 ft at 9:45pm Nov 23 Observed: 4.59 ft at 10:00pm Nov 23 Observed: 4.59 ft at 10:15pm Nov 23 Observed: 4.59 ft at 10:30pm Nov 23 Observed: 4.59 ft at 10:45pm Nov 23 Observed: 4.58 ft at 11:00pm Nov 23 Observed: 4.58 ft at 11:15pm Nov 23 Forecast: 4.7 ft at 1:00pm Nov 23 Forecast: 4.6 ft at 7:00pm Nov 23 Forecast: 4.6 ft at 1:00am Nov 24 Forecast: 4.5 ft at 7:00am Nov 24 Forecast: 4.5 ft at 1:00pm Nov 24 Forecast: 4.5 ft at 7:00pm Nov 24 Forecast: 4.5 ft at 1:00am Nov 25 Forecast: 4.4 ft at 7:00am Nov 25 Forecast: 4.5 ft at 1:00pm Nov 25 Forecast: 4.5 ft at 7:00pm Nov 25 Forecast: 4.5 ft at 1:00am Nov 26 Forecast: 4.5 ft at 7:00am Nov 26 Graph Created (12:37am Nov 24, 2009) Observed Forecast (issued 9:32am Nov 23)  USGS--Water Resources of the United States HNKM2 (plotting HGIRG)   Gage 0  Datum: 383.68 Latest observed value: 4.58 ft at 11:15 PM EST 23-Nov-2009. Flood Stage is 30.0 ft.   Stage (ft) Flow (kcfs)
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About this graph
Tabular Data
XML Data
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Datum: N/A
Metadata
NOTE: Forecasts for the Potomac River at Hancock are issued routinely year-round.

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Upstream Gauge - at Paw Paw Upstream Gauge Downstream Gauge Downstream Gauge - at Williamsport

Flood Categories (in feet)
Major Flood Stage:35
Moderate Flood Stage:33
Flood Stage:30
Action Stage:24

Historical Crests
(1) 47.60 ft on 03/18/1936
(2) 41.20 ft on 11/06/1985
(3) 40.00 ft on 06/01/1889
(4) 36.63 ft on 10/16/1942
(5) 36.26 ft on 01/20/1996
Show More Historical Crests

Low Water Records
(1) 2.0 ft on 10/04/1932
(2) 2.1 ft on 09/12/1966

Potomac River at Hancock location map

Flood Impacts Collapse
56.0 water approaches the highest point on Main Street.
46.0 water floods the Railroad Depot.
45.0 water isolates the town of Hancock.
40.0 water floods 25 to 30 homes along the West Virginia side of the river just downstream from Hancock.
35.0 water inundates 20 to 30 homes and 5 or more businesses in the west end of town.
33.0 water floods low spots on east Main Street.
31.0 water begins to flood low spots of west Main Street.
30.0 water begins to inundate some homes and businesses in the town of Hancock.
28.0 water begins to inundate some yards on the west end of town.
25.0 water begins to inundate low points of the old B&O Railroad tracks on the West Virginia side of the river.
24.0 water begins to overflow into low lying areas.
7.0 the river is at hazardous levels for recreational use.

About This Location Collapse
Latitude: 39.697600° N, Longitude: 78.177900° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 30 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 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 383.68 ft 413.68 ft Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other N/A N/A  

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Hancock

Resources Collapse
Hydrologic Resources
Additional Resources
   

Collaborative Agencies Collapse
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
(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(703) 996-2200
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Page last modified: 29-Jun-2009 10:11 PM
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