Tue, 20 Apr 2021 21:27:48 +0000 Tue, 20 Apr 2021 21:27:48 +0000 Ocean Prediction Center - Marine Weather Discussion (N Pacific) https://ocean.weather.gov/ none Ocean Prediction Center web team en-us https://ocean.weather.gov/contact/index.php https://ocean.weather.gov/images/xml_logo_opc.gif https://ocean.weather.gov/ NOAA logo 95 45 MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
226 PM PDT Tue Apr 20 2021

.FORECAST DISCUSSION...Major features/winds/seas/significant
.weather for the North Pacific N of 30N and E of 150W.

High pressure will persist to the west of the north waters while
strong inland trough along California coast will start to weaken
slowly into the extended period. Latest NCEP surface weather map
has inland low pressure 1010 mb over north California with a
front extending north along the Oregon and Washington coast and a
trough extending south along the California coast. High pressure
1035 mb near 45N135W extends a ridge southeast into the central
and southern waters. Pressure gradient is tightening over the
central waters where winds are highest.

Global models at 500 mb, now show some energy embedded in a
short wave along the west coast and that will slowly drop down
into central and southern california coast as high pressure
remains just west of the forecast region water in the short term
into the extended period. The energy will slowly thin out and
that will weaken the trough along California coast in the
extended period.

Global models GFS/CMC/NOGAPS/UKMETHR/ECMWFHR have continued to
generally initialize the current synoptic surface observations
fairly well. Models are still in a good agreement on maintaining
high pressure to the west and keeping a trough along the coast.
Models also continue to show high pressure dominating the
forecast waters but weakening in the extended period. Small
variations are still among the models mainly on the extent of
areal coverage of higher winds in the short term. Will still use
GFS as it continues to have a slightly larger area covered by
enhanced winds and even stronger than NOGAPS and UKMETHR while
ECMWFHR still has the weakest winds. Both CMC and GFS have a
better and are much closer to the observations and for
consistency, will continue to use GFS for winds.


.SEAS...are still relatively large across the forecast waters with a
peak at 15 ft over eastern inner central California waters. Seas
range between 9 and 14 ft over the rest of the waters. GFSwave
and ECMWFWAVE models fit generally well the observed seas and
have been quite consistent with observations in previous runs.
Both wave models still agree on keeping relatively large seas
across over the central waters initially and will then subside in
the extended period. This is reasonable as winds are relatively
higher over the central waters initially and will then diminish.
Will use GFSglobal wave for seas.


.EXTRATROPICAL STORM SURGE GUIDANCE...n/a.


.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
.PZZ800...Inner Waters from Cape Flattery to Cape Shoalwater...
Gale Wednesday night.

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
Gale tonight into Wednesday.
.PZZ825...Inner Waters from Point Arena to Pigeon Point...
Gale tonight into Wednesday.
.PZZ830...Inner Waters from Pigeon Point to Point Piedras Blancas...
Gale tonight.

$$

.Forecaster Musonda. Ocean Prediction Center.
]]> Tue, 20 Apr 2021 21:27:48 +0000 https://ocean.weather.gov/shtml/NFDMIMPAC.php https://ocean.weather.gov/shtml/NFDMIMPAC.php?202104202127 Ocean Prediction Center web team