New Polygon-Based River Flood Warnings

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New Polygon-Based River Flood Warnings

On June 16, 2014, The National Weather Service Forecast Office New York, NY began issuing polygon-based river flood warnings and statements for six river forecast points across the hydrologic service area. Using the new polygon warning method reduces the warned area by a significant amount compared to the county-based river flooding warning. This change in warning methodology aligns river flood products with other polygon-based warning products, and will be displayed on the Watch/Warning/Advisory Map on our home page. The following are examples of the new polygons for each of our six river forecast points.

BEAC3: Naugatuck River Above Beacon Falls

GRDN6: Wallkill River at Gardiner

JCYC3: Quinebaug River Above Jewitt City

LODN4: Saddle River at Lodi

MAWN4: Ramapo River at Mahwah

YTCC3: Yantic River at Yantic

The only change to the warning text product will be the addition of lattitude/longitude pairs, which produce the warning polygons, after the last ampersands (&&). There are no changes to the VTEC (header). The following is an example for the Saddle River at Lodi.

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