HAZARDOUS WEATHER OUTLOOK
Issue Date: 542 AM PST WED DEC 30 2009
Expiration: 600 AM PST THU DEC 31 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
SHOWERS WILL LOCALLY MIX WITH SNOW SHOWERS IN THE COAST RANGE AND
CASCADE FOOTHILLS THIS MORNING...WITH POCKETS OF FREEZING RAIN
ALSO LIKELY IN THE NORTHERN INLAND VALLEYS ESPECIALLY NEAR THE
COLUMBIA RIVER. MAINLY RAIN SHOWERS ARE EXPECTED IN THE AFTERNOON
AND EVENING.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
SNOW IS POSSIBLE IN THE COAST RANGE AND CASCADE FOOTHILLS THURSDAY
MORNING...BUT SNOW LEVELS WILL RISE ABOVE 3000 FEET IN THE
AFTERNOON.
.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT
Issue Date: 318 AM PST WED DEC 30 2009
Expiration: 300 PM 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.
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