Times indicated in table below are hours from the time the river forecast
was issued. The time stamp at the bottom of each forecast map indicates the
actual time when forecast map will be valid.
Inundation areas depicted on these map images were derived
using two models plus a GIS (Geographic Information System).
The National Weather Service hydrologic model was used to predict the amount
of flow entering the Tar River at various points. Using these predicted
flows, a dynamic routing model, FLDWAV, was used to predict a profile of water
surface elevations. This FLDWAV implementation predicts the water
surface profile only along the Tar River main stem,
and is not intended to predict water surface elevation on tributaries.
A map, that provides a visual depiction of a flood forecast, is created using
a series of GIS algorithms.
This forecast map product can be used as a planning tool, but with some
caution. Forecast inundation is dependent on forecast rainfall
(Quantitative Precipitation Forecast or QPF) and may change significantly if
meteorological conditions change rapidly. Forecast maps would be updated
daily.
Producing river stage forecasts using FLDWAV is an experimental effort. During
this experimental phase, forecast river stages used to produce inundation maps
are not constrained to match forecast stages in official forecast products.
Official river forecasts for the Tar River can be found at
:
http://www.srh.noaa.gov/serfc/ahps/ahps_RVFNC.htm
Official river forecast products are updated daily in any case, and more
frequently if conditions warrant.
The map images show inundation on some of the tributaries flowing into the Tar
River. The inundation on these tributaries is approximated by the
mapping methods. Areas on these tributaries may experience different
conditions than are depicted here.
If you wish to send feedback on SERFC products, please contact:
jack.bushong@noaa.gov
Additional Information
For background information about this project and Hurricane Floyd's impact on
the Tar River Basin, please visit
Flood
Forecast Mapping, Tar River Basin, North Carolina
For information on the inundation mapping product, please click here.Have questions about flood forecast mapping? Visit the Flood
Forecast Mapping FAQ
Visit the Tar
River Basin AHPS Multi-Media Page
The
series of images, in the table below, represents the forecast inundation areas
for approximately 73 river miles of the Tar River from downstream of the Tar
Reservoir (upstream of Rocky Mount, NC) to just below N. Green Street in
Greenville, NC. The boxed area, on the map to the right, represents the
approximate geographic area (880 Square Miles) being depicted on these maps.
