SPECIAL WEATHER STATEMENT
Issue Date: 446 PM PST MON DEC 28 2009
Expiration: 700 AM PST TUE DEC 29 2009
...INCREASING THREAT FOR COASTAL FLOODING LATE THIS WEEK...
INCREASINGLY HIGH ASTRONOMICAL TIDES COMBINED WITH A POTENT
PACIFIC STORM SYSTEM WILL BRING STRONG SOUTHERLY WINDS TO THE
COAST AND THE POTENTIAL FOR COASTAL FLOODING TOWARDS 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 POWERFUL 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 BOTH 1152 AM ON THURSDAY AND 1244 PM ON 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. HOWEVER IF THE STORM IS A STRONG ONE
IT COULD ADD AN ADDITIONAL 2 TO 4 FEET TO THE BASE ASTRONOMICAL
TIDE.
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: 854 AM PST MON DEC 28 2009
Expiration: 900 AM PST TUE DEC 29 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...TUESDAY THROUGH SUNDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.
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