Public Information Statement
Issued by NWS Sterling, VA

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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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