SPECIAL WEATHER STATEMENT
Issue Date: 235 PM PST TUE DEC 29 2009
Expiration: 1000 PM PST TUE DEC 29 2009
...INCREASING THREAT FOR COASTAL FLOODING LATE THIS WEEK...
INCREASINGLY HIGH ASTRONOMICAL TIDES...COMBINED WITH A MODERATE
SOUTH WINDS ASSOCIATED WITH STRONGER FRONTS ARRIVING...WILL BRING
A POTENTIAL FOR COASTAL FLOODING TOWARD THE END OF THE WEEK. THE
FIRST OF THESE STRONGER FRONTS IS EXPECTED TO MAKE LANDFALL MIDDAY
THURSDAY WHICH COINCIDES WITH ONE OF THE HIGHEST HIGH TIDES OF THE
YEAR.
A SECOND FRONT WILL SWING ON SHORE ON FRIDAY ALSO NEAR THE TIME
OF HIGH TIDE. LARGE WESTERLY SWELL GENERATED BY THE STORM SYSTEM
WILL ARRIVE AT THE COAST ON FRIDAY POSSIBLY GENERATING HAZARDOUS
SURF CONDITIONS AS WELL AS ADDING TO THE COASTAL FLOODING
POTENTIAL.
AT TOKE POINT NEAR WILLAPA BAY...ASTRONOMICAL HIGH TIDES OF 11.1
FT WILL OCCUR AT THE MIDDAY TIDES THURSDAY AND FRIDAY. WATER
LEVELS OVER 11 FT CREATE MINOR TIDAL OVERFLOWS WHILE 14.5 FT IS
THE THRESHOLD FOR MORE WIDESPREAD COASTAL FLOODING PROBLEMS. THE
MAGNITUDE OF TIDAL ANOMALY...THE ADDITIONAL BOOST TO THE COASTAL
WATER LEVEL DUE TO THE ACTION OF FRONTAL SYSTEM ITSELF...IS STILL
UNCERTAIN.
FACTORS THAT WILL INFLUENCE THE FINAL WATER HEIGHT INCLUDE...THE
DEPTH OF THE LOW PRESSURE AREA AND STRENGTH OF THE WINDS...THE
AMOUNT OF RUNOFF ADDED TO THE COASTAL RIVERS AND THE AMOUNT WAVE
ACTION ALONG THE BEACHES TO DRIVE THE WATER FURTHER UP.
HAZARDOUS WEATHER OUTLOOK
Issue Date: 530 AM PST TUE DEC 29 2009
Expiration: 600 AM PST WED DEC 30 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
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