SPECIAL WEATHER STATEMENT - coast

NATIONAL WEATHER SERVICE PORTLAND OR
318 AM PST WED DEC 30 2009
ORZ001-002-WAZ021-302300-
NORTH OREGON COAST-CENTRAL OREGON COAST-SOUTH WASHINGTON COAST-
INCLUDING THE CITIES OF...ASTORIA...CANNON BEACH...TILLAMOOK...
LINCOLN CITY...NEWPORT...FLORENCE...RAYMOND...LONG BEACH...
CATHLAMET
318 AM PST WED DEC 30 2009
...INCREASING THREAT FOR COASTAL FLOODING THURSDAY THROUGH
SATURDAY...
...HIGH SURF CONDITIONS POSSIBLE FRIDAY AFTERNOON THROUGH FRIDAY
NIGHT...
INCREASINGLY HIGH ASTRONOMICAL TIDES WILL COMBINE WITH MODERATE
SOUTH WINDS THURSDAY THROUGH SATURDAY TO BRING A POTENTIAL FOR
COASTAL FLOODING. THE FIRST SOUTH WIND EPISODE WILL ARRIVE MIDDAY
THURSDAY WHICH COINCIDES WITH ONE OF THE HIGHEST HIGH TIDES OF THE
YEAR.
A SECOND SOUTH WIND EPISODE WILL DEVELOP AROUND MIDDAY FRIDAY AND
CONTINUE THROUGH SATURDAY MORNING. THE TIMES MOST SUSCEPTIBLE TO
MINOR TIDAL OVERFLOW OR COASTAL FLOODING WILL BE FRIDAY AROUND
MIDDAY AND AGAIN AROUND MIDDAY SATURDAY. LARGE WESTERLY SWELL
WILL ARRIVE ALONG THE COAST ON FRIDAY POSSIBLY GENERATING
HAZARDOUS SURF CONDITIONS AS WELL AS ADDING TO THE COASTAL
FLOODING POTENTIAL. SWELL MAY REACH 20 TO 25 FEET BY FRIDAY
AFTERNOON AND CONTINUE ABOVE 20 FEET THROUGH FRIDAY NIGHT.
AT TOKE POINT NEAR WILLAPA BAY...ASTRONOMICAL HIGH TIDES OF 11.1
FT WILL OCCUR AT THE MIDDAY TIDES THURSDAY...FRIDAY...AND SATURDAY.
WATER LEVELS OVER 11 FT CREATE MINOR TIDAL OVERFLOW CONDITIONS
WHILE 14.5 FT IS THE THRESHOLD FOR MORE WIDESPREAD COASTAL
FLOODING PROBLEMS.
THE MAGNITUDE OF THE TIDAL ANOMALY...THE HEIGHT OF THE ARRIVING
WESTERLY SWELL...AS WELL AS THE AMOUNT OF RUNOFF FROM COASTAL
RIVERS ARE ALL UNCERTAIN AT THIS TIME.
$$