North Pacific Marine Weather Discussion

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AGPN40 KWNM 131530

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
830 AM PDT Tue Apr 13 2021

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

Strong 1033 mb high pressure was near the NW Washington waters
this morning with a ridge extending to the SW of the high to the
W of the WA/OR and northern CA waters. A coastal trof was along 
the WA/OR and central and northern CA. Strongest pressure 
gradient was along the inner N and central CA waters where winds 
were winds were to 30 kt. The synoptic pattern changes little
today into tonight before winds begin to diminish over inner N
and central CA waters Wed and Wed night as the coastal trof and
area of high pressure becomes weaker. With regards to the seas
the the observed seas are close to gridded values with up to 13
ft near the inner N CA waters at 12Z. 

For the morning update no changes are planned to the updated 
morning forecast which agreed with observed conditons.

Relatively quiet weather will be the theme over the PZ5 and PZ6
waters through the forecast period. The 0600 UTC NCEP surface
analysis shows a 1032 mb high centered W of the PZ5 waters with a
surface trough extending from central California NW up through
Oregon and coastal Washington. The earlier gales have subsided,
though gale force wind gusts are still occurring in the coastal
southern Oregon and northern California waters. Winds will
continue out of the N-NW averaging 20-30 kts into Thu morning
before gradually subsiding.

The aforementioned high will remain just W of the PZ5 waters with
the surface ridge extending S to SW just W of the PZ6 waters
through early Tue. Meanwhile, a weaker coastal trough will
continue along the California and Oregon coasts, but the gradient
will be much weaker than previous days. Low pressure develops 
well W of the PZ6 waters Thu and will move N with any winds 
associated with the low remaining well W of the offshore waters, 
yet some swell will approach the zones starting late Sun.

Model agreement remains good over the forecast area through the 
period. Will continue to use the GFS for wind and wave grids 
through the whole period. No hazards are expected through the
forecast period. 



.PZ5 Washington/Oregon Waters...

.PZ6 California Waters...


.Forecaster Rowland/Folmer. Ocean Prediction Center.