196
AGPN40 KWNM 292047
MIMPAC
MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
147 PM PDT THU APR 29 2021
FORECAST DISCUSSION
MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT
.WEATHER FOR THE NORTH PACIFIC N OF 30N AND E OF 150W.
HIGH PRESSURE WAS CENTERED TO THE W OF THE CENTRAL CA WATERS
WITH A RIDGE EXTENDING NE OVER THE N CA AND SE OR WATERS. A COLD
FRONT WAS TO THE W OF THE WA/OR AND N CA WATERS EARLY THIS
AFTERNOON. THERE WAS A ASCAT PASS OVER PORTIONS OF THE OFFSHORE
WATERS AT 17Z/10 AM PDT WHICH COVERED MUCH OF THE WA WATERS AND
THE OUTER OR/NORTHERN CA WATERS AND ALSO THE MOST OF THE
SOURTHERN CA WATERS. MAX WINDS WERE TO 20 KT OVER THE OUTER WA/OR
WATERS. WINDS WERE TO 25 KT JUST W OF THE OUTER WA OFFSHORE
WATERS. THE WEAKENING COLD FRONT MOVES E OVER THE WA/OR OUTER
WATERS LATER THIS AFTERNOON INTO TONIGHT. THE WEAK COLD FRONT
MOVES S AND SE INTO THE NORTHERN CA WATERS FRI, THEN INTO THE
CENTRAL CA WATERS FRI NIGHT AND SAT THEN DISSIPATES AS IT CROSSES
INTO THE SOUTHERN CA WATERS. A BROAD AREA OF HIGH PRESSURE
EXPANDS AND BUILDS IN FROM THE W LATER FRI THROUGH SAT NIGHT OVER
THE CENTRAL AREAS OF THE OFFSHORE WATERS, THEN PERSISTS INTO MON
NIGHT AND THEN WEAKENS INTO TUE NIGHT. CURRENT HEADLINES HAVE
GALES DEVELOPING LATER SUN AND SUN NIGHT OVER THE INNER WATERS OF
THE CENTRAL AND S CA WATERS AND WILL MAINTAIN THEM. COULD HAVE
GALES LASTING INTO MON, BUT WILL HAVE 30 KT FOR MON INTO MON
NIGHT OVER THE CA WATERS DUE TO ECMWF BEING NOT AS STRONG WITH
THE AREA OF HIGH PRESSURE. THE AREA OF HIGH PRESSURE BECOMES
WEAKER LATER MON NIGHT THROUGH TUE NIGHT. THE RESULTANT WINDS
GRADUALLY DIMINISH IN AREAL COVERAGE AS THIS OCCURS.
FOR THE GRIDS WILL USE THE GFS OVERALL THROUGH THE FORECAST
PERIOD WITH THE EXCEPTION OF LATE MON INTO MON NIGHT WHERE WE
WILL CAP THE WINDS TO 30 KT ALONG THE INNER CENTRAL CA WATERS.
SEAS...BOTH THE 12Z GFS WAVE GUIDANCE AND ECMWF WAM ARE
INITIALIZED WELL OVER THE OFFSHORE WATERS EARLY THIS AFTERNOON
AND SIMILAR THROUGH EARLY SAT. THE GFS WAVE GUIDANCE HAS HIGHER
SEAS DEVELOPING ACROSS THE CENTRAL AND SOUTHERN CA LATER ON SAT
INTO SAT NIGHT WITH THE ECMWF WAM CATCHING UP WITH THE GFS WAVE
GUIDANCE LATER ON SUN INTO SUN NIGHT. FOR THE GRIDS WILL USE THE
GFS WAVE THROUGH THE FORECAST PERIOD.
THIS IS THE FINAL NORTH PACIFIC OCEAN MARINE WEATHER DISCUSSION (MIM).
REFERENCE THE NATIONAL WEATHER SERVICE SERVICE CHANGE NOTICE:
HTTPS://WWW.WEATHER.GOV/MEDIA/NOTIFICATION/PDF2/SCN21-35MIN_DISCONTINUE.PDF
EXTRATROPICAL STORM SURGE GUIDANCE
N/A
WARNINGS
PRELIMINARY.
PZ5 WASHINGTON/OREGON WATERS
NONE.
PZ6 CALIFORNIA WATERS
PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT
GALE POSSIBLE SUNDAY NIGHT INTO MONDAY.
PZZ830...INNER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS
GALE POSSIBLE SUNDAY NIGHT.
PZZ835
INNER WATERS FROM POINT PIEDRAS BLANCAS TO SANTA CRUZ ISLAND, CA...
GALE POSSIBLE SUNDAY NIGHT.
.FORECASTER ROWLAND. OCEAN PREDICTION CENTER.
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