HYDROLOGIC OUTLOOK
Warning Issue Date: 446 AM CST MON NOV 30 2009
LOCALLY HEAVY RAINFALL POSSIBLE ACROSS SOUTHEAST LOUISIANA AND
SOUTHERN MISSISSIPPI THIS WEEK...
A MOIST TROPICAL AIR MASS WILL MOVE INTO THE REGION AS A SURFACE
LOW DEVELOPS IN THE WESTERN GULF OF MEXICO. SHOWERS AND A FEW
THUNDERSTORMS ALONG THE COAST ARE EXPECTED TO MOVE INTO THE AREA
AS THIS LOW PRESSURE SYSTEM TRACKS ACROSS SOUTHEASTERN LOUISIANA.
THE HEAVIEST RAIN CAN BE EXPECTED TUESDAY EVENING THROUGH
WEDNESDAY MORNING. DUE TO THE HIGH MOISTURE CONTENT OF THE
ATMOSPHERE...RAIN PRODUCTION FROM THESE SHOWERS AND THUNDERSTORMS
WILL BE VERY EFFICIENT.
AREA AVERAGE RAINFALL TOTALS FOR THE TUESDAY THROUGH WEDNESDAY PERIOD
ARE GENERALLY EXPECTED TO BE IN THE 4 TO 6 INCH RANGE. HOWEVER...
LOCALLY HIGHER AMOUNTS WILL BE POSSIBLE.
WATER LEVELS IN AREA RIVERS ARE CURRENTLY LOW...AND NO RIVER
FLOODING IS EXPECTED AS A RESULT OF THIS RAINFALL. HOWEVER...
ELEVATED FLOWS MAY BE EXPERIENCED ON SOME OF THE FASTER RESPONDING
STREAMS AND RIVERS.
ADDITIONALLY...SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING
VERY HIGH RAINFALL RATES...UPWARDS OF TWO INCHES PER HOUR.
WIDESPREAD FLASH FLOODING IS NOT EXPECTED. HOWEVER...LOCALIZED
EFFECTS WILL LIKELY ACCOMPANY THE HEAVIEST STORMS. THIS WILL
INCLUDE PONDING OF WATER ON ROADWAYS AND IN AREAS OF POOR
DRAINAGE.
PEOPLE IN THE AFFECTED AREAS SHOULD BE AWARE OF THE FLOODING
POTENTIAL...AND MONITOR THE LATEST INFORMATION FOR ANY
STATEMENTS...WATCHES OR WARNINGS THAT MAY BE ISSUED.
$$
COASTAL FLOOD WATCH
Warning Issue Date: 450 AM CST MON NOV 30 2009
...COASTAL FLOOD WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH
LATE TUESDAY NIGHT...
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A COASTAL
FLOOD WATCH...WHICH IS IN EFFECT FROM TUESDAY AFTERNOON THROUGH
LATE TUESDAY NIGHT.
A STRONG LOW PRESSURE AREA...WITH GALE FORCE WINDS UP TO 40 MPH
WITH HIGHER GUSTS...IS EXPECTED TO DEVELOP IN THE NORTHWEST GULF
OF MEXICO TONIGHT AND MOVE ACROSS THE CENTRAL GULF COAST REGION
LATE TUESDAY THROUGH EARLY WEDNESDAY MORNING. MODERATE TO STRONG
NORTHEAST WINDS TONIGHT AND TUESDAY MORNING WILL BECOMING EAST TO
SOUTHEAST AND CONTINUE TO INCREASE TUESDAY AFTERNOON...THEN REMAIN
STRONG OUT OF THE SOUTH AND SOUTHEAST 30 TO 40 MPH WITH SOME
HIGHER GUSTS IN COASTAL SECTIONS THROUGH MUCH OF TUESDAY NIGHT.
THE COMBINATION OF WIND DRIVEN TIDES AND LARGE ASTRONOMICAL TIDE
RANGES ARE EXPECTED TO CAUSE A RAPID RISE IN WATER LEVELS OF 3 TO
4 FEET FROM LOW TIDE IN THE MORNING TO HIGH TIDE IN THE EVENING
TUESDAY. AREAS OF COASTAL FLOODING ARE LIKELY TO DEVELOP OUTSIDE
OF HURRICANE PROTECTION LEVEES NEAR THE TIDAL LAKES AND COAST.
WATER LEVELS WILL DROP AND END THE COASTAL FLOODING THREAT LATE
TUESDAY NIGHT AND WEDNESDAY MORNING AS WINDS SHIFT TO WESTERLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A COASTAL FLOOD WATCH MEANS THAT CONDITIONS FAVORABLE FOR
FLOODING ARE EXPECTED TO DEVELOP. COASTAL RESIDENTS SHOULD BE
ALERT FOR LATER STATEMENTS OR WARNINGS...AND TAKE ACTION TO
PROTECT PROPERTY.
$$
22/TD
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