Reducing River Flood Over-Warning - Local news, weather, sports Savannah | WSAV On Your Side

Reducing River Flood Over-Warning

New River Forecast Point Polygons (NWS Charleston SC) New River Forecast Point Polygons (NWS Charleston SC)

Good Wednesday morning! We have quite a few rivers across the Coastal Empire and Low Country… as you know… and when these rivers begin to flood… river flood warnings are issued by the National Weather Service and that information is disseminated to our WSAV viewers and on

River flood warnings were until recently county-based products… alerting an entire county or group of counties… even though only a small area near the river will be impacted.

National Weather Service (NWS) Charleston… South Carolina… has warning responsibility for nine river forecast points along six rivers in southeast South Carolina and Georgia.

If all nine of NWS Charleston's forecast points were under active warnings… NWS Charleston warned 19 counties… just over 14,000 square miles of area… vastly over warning its area.

To provide a better… more detailed service… NWS Charleston is now testing polygon-based warnings for river forecast points. Each polygon size and extent is determined by known flooding impacts and river reach analysis provided by the U.S. Geological Survey. The polygons highlight a much more precise area around each forecast point.

In the new polygon configuration… if all nine forecast points are under active warnings… the total warned area is just 1,000 square miles… reducing the warning area by as much as 92 percent.

This will help greatly clarify only areas that will need to be concerned about river flooding!

Have a great day!

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