502
AGPN40 KWNM 282049
MIMPAC
MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
149 PM PDT WED APR 28 2021
FORECAST DISCUSSION
MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT
.WEATHER FOR THE NORTH PACIFIC N OF 30N AND E OF 150W.
A HIGH PRESSURE RIDGE WAS OVER THE CENTRAL AND NORTHERN AREAS OF
CA AND EXTENDED NE OVER THE OR AND WA OFFSHORE WATERS, THEN
INLAND. A WEAK TROF WAS ACROSS THE INTERIOR OF CA INTO OR EARLY
THIS AFTERNOON. WINDS ARE LIGHT THROUGHOUT MOST AREAS OF THE
OFFSHORE WATERS AT 15 KT OR LESS EARLY THIS AFTERNOON. WINDS WERE
TO 20 KT OVER THE WA WATERS IN ASSSOCIATION WITH A WARM FRONT
JUST N OF THE WATERS. THE HIGH PRESSURE RIDGE MOVES LITTLE
TONIGHT INTO THU WHILE A WEAKERNING COLD FRONT PUSHES E INTO THE
WA/OR WATERS. ON THU NIGHT INTO FRI THE COLD FRONT MOVES SE INTO
THE N CA WATERS AND DISSIPATES OVER THE CENTRAL CA WATERS FRI
AND FRI NIGHT. WINDS PICKUP OVER THE INNER CENTRAL AND S CA
WATERS FRI NIGHT INTO SAT AS AN EXPANDING AND STRENGTHENING AREA
OF HIGH PRESSURE BUILDS IN FROM THE W AND NW OVER THE CENTRAL
AREAS OF OFFSHORE WATERS. WINDS INCREASE TO 25 KT OR 30 KT OVER
THE INNER CENTRAL CA LATE SAT AND SAT NIGHT, THEN PERSISTS TO THE
W AND NW OF THE N AND CENTRAL CA WATERS THROUGH MON BEFORE
WEAKENING MON NIGHT. A COLD FRONT MOVES E OVER THE WA/OR WATERS
MON AND MOVES SE AND INLAND MON NIGHT. BOTH THE GFS AND ECMWF ARE
IN CLOSE AGREEEMENT WITH THE TIMING OF THE FRONT AND PASSAGE
OVER THE WA/OR WATERS. FOR THE GRIDS WITH FEW DIFFERENCES EVIDENT
PLAN TO USE THE GFS THROUGH THE FORECAST PERIOD.
SEAS...GFS WAVE GUIDANCE AND ECMWF WAM ARE IN SIMILAR AGREEMENT
THROUGH MON NIGHT AND WILL USE THE GFS WAVE GUIDANCE WITH LITTLE
ADJUSTMENT ANTICIPATED.
EXTRATROPICAL STORM SURGE GUIDANCE
N/A
WARNINGS
PRELIMINARY.
PZ5 WASHINGTON/OREGON WATERS
NONE.
PZ6 CALIFORNIA WATERS
NONE.
.FORECASTER ROWLAND. OCEAN PREDICTION CENTER.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page