Public Information Statement
Issued by NWS Sterling, VA

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000 NOUS41 KLWX 251527 PNSLWX DCZ001-MDZ013-VAZ053-054-260000- PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1127 AM EDT TUE AUG 25 2015 ...ROUTINE WATER LEVEL FORECAST GUIDANCE TO BE OFFERED FOR THE TIDAL POTOMAC IN AND NEAR ALEXANDRIA VA STARTING IN LATE SEPTEMBER... BEGINNING TUESDAY SEPTEMBER 29TH 2015...THE NATIONAL WEATHER SERVICE PLANS TO BEGIN PROVIDING ROUTINE DAILY FORECASTS OF TIDAL HEIGHTS ON THE TIDAL POTOMAC RIVER IN ALEXANDRIA VIRGINIA. THIS IS IN ADDITION TO EXISTING TIDAL FORECAST SERVICES OFFERED AT GEORGETOWN/WISCONSIN AVENUE ON THE TIDAL POTOMAC AND AT WASHINGTON CHANNEL AT THE SOUTHWEST WATERFRONT IN DC. IN ADDITION TO SERVING THE ENTIRE ALEXANDRIA WATERFRONT...THE ALEXANDRIA FORECAST WILL BE THE CLOSEST FORECAST LOCATION TO THE BELLE HAVEN COMMUNITY IN FAIRFAX COUNTY...AND NATIONAL HARBOR IN PRINCE GEORGES COUNTY. FORECASTS AT ALEXANDRIA WILL BE PROVIDED IN NAVD88 ELEVATION...SO RIVERSIDE INTERESTS WHO KNOW THE ELEVATION OF THEIR CRITICAL ASSETS CAN DIRECTLY USE THE FORECAST TO DETERMINE THEIR FLOOD THREAT. THE WATER LEVEL FORECASTS PROVIDED BY THE NATIONAL WEATHER SERVICE MAY NOT FULLY ACCOUNT FOR THE EFFECTS OF WIND-DRIVEN WATER AND SURGE...ESPECIALLY IN MAJOR EVENTS. THE NATIONAL WEATHER SERVICE WILL CONTINUE TO USE EXISTING PRODUCTS AND PROCEDURES FOR PROVIDING WATCH...WARNING...AND ADVISORY SERVICES TO THIS AREA THROUGH THE COASTAL FLOOD SUITE OF PRODUCTS. COASTAL FLOOD ADVISORIES WILL BE ISSUED WHEN MINOR FLOODING IS EXPECTED. COASTAL FLOOD WATCHES WILL BE ISSUED WHEN MODERATE OR GREATER FLOODING IS POSSIBLE...AND COASTAL FLOOD WARNINGS WILL BE ISSUED WHEN MODERATE OR GREATER FLOODING IS EXPECTED. IT IS IMPORTANT TO NOTE THAT IN WIND-DRIVEN EVENTS...BECAUSE OF THE LIMITATION NOTED ABOVE...THE ISSUANCE OF COASTAL FLOOD WATCH... WARNING...OR ADVISORY PRODUCTS MAY NOT ALWAYS COINCIDE WITH THE FORECAST GUIDANCE SHOWING EXCEEDANCE OF THE FLOOD THRESHOLD... ALTHOUGH USUALLY IT WILL. THE EXISTING FLOOD CATEGORIES AT ALEXANDRIA WILL REMAIN UNCHANGED. MINOR 3.1 FEET...MODERATE 4.5 FEET...MAJOR 6.6 FEET /ALL NAVD88/. IF YOU HAVE QUESTIONS ABOUT THIS NEW FORECAST SERVICE...CONTACT: JASON ELLIOTT SENIOR SERVICE HYDROLOGIST NWS BALTIMORE/WASHINGTON JASON.ELLIOTT@NOAA.GOV $$ JE

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