FLOOD WATCH (AGAIN)

FLOOD WATCH
NATIONAL WEATHER SERVICE ANCHORAGE AK
523 AM AKDT TUE SEP 18 2012

AKZ125-190230-
/X.NEW.PAFC.FA.A.0005.120919T1200Z-120921T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WESTERN PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF…WHITTIER…SEWARD…GIRDWOOD…
MOOSE PASS
523 AM AKDT TUE SEP 18 2012

…FLOOD WATCH IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY
AFTERNOON…

THE NATIONAL WEATHER SERVICE IN ANCHORAGE HAS ISSUED A

* FLOOD WATCH FOR WESTERN PRINCE WILLIAM SOUND.

* FROM LATE TONIGHT THROUGH THURSDAY AFTERNOON



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* MODELS SHOW WIDESPREAD AREAS OF 4 TO 7 INCHES OF RAINFALL WITH
SOME AREAS IN THE MOUNTAINS SHOWING AMOUNTS GREATER THAN 9
INCHES THROUGH WEDNESDAY AFTERNOON. STREAMS AND RIVERS IN THE
AREA DRAINING INTO PRINCE WILLIAM SOUND AND IN THE SEWARD AREA
WILL RISE RAPIDLY TO BANK FULL LEVELS AND FLOODING IS POSSIBLE.

* IMPACTS…SMALL STREAMS WILL RISE RAPIDLY AND MAY EXCEED BANK
FULL LEVELS. MINOR FLOODING AND URBAN DRAINAGE PROBLEMS ARE
LIKELY. IF EXPECTED PRECIPITATION AMOUNTS ARE EXCEEDED…MODERATE
TO MAJOR FLOODING COULD OCCUR. SOME LOCATIONS MAY SEE SITUATIONS
WHERE GRAVEL AND SEDIMENT DEPOSITS ON STREAM BEDS HAVE RAISED
THE CHANNEL BOTTOM…LEADING TO FLOODING AS STREAM CAPACITY IS
EXCEEDED MORE QUICKLY THAN IN THE PAST.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING.

YOU ARE ENCOURAGED TO CLOSELY MONITOR THIS WEATHER SITUATION.
PREPARATION FOR THIS POTENTIALLY DANGEROUS WEATHER EVENT SHOULD
BEGIN NOW.

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