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000
AGPN40 KWNM 281430
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
730 AM PDT Fri Jul 28 2017

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

At this time I don not plan on making any changes to the current
grids or associated text forecast. unfortunately the most recent
ASCAT swath across the offshore waters is missing the area along
the California waters containing the highest winds. 25-30 kt
along the northern and central California coast is likely this
morning.

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PREVIOUS DISCUSSION...

An High pressure area was to the W of the CA waters early this
morning while a thermal trough was over nrn CA. These features
remain through the forecast with some intensification of the
coastal trough Sat night into Sun as high pressure ridge becomes
slightly stronger. Both the high pressure ridge and coastal
trough then become weaker gradually becomes weaker by later Mon
through Tue night. There was an ASCATB pass with a swath along
the far wrn offshore waters at 05Z. Strongest winds were to 20 kt
over wrn areas of The central and nrn CA. Would prefer to see
the data further E over the inner areas of the nrn and central CA
waters. However, model guidance continues to show strongest
winds likely to 25 kt or 30 kt over the ern areas of the nrn and
central CA waters this morning adjacent to the coast. With
respect to seas there is a buoy report with 11 ft in this area
which continues to be about 2 ft higher than either the WWIII or
the ECMWF WAM.

Will likely use the GFS 10m winds for the grids through the
forecast period with few adjustments to output.

Seas...The WWIII and ECMWF wam look similar with the seas through
the forecast period. Will use a 50/50 blend through Tue night,
although will manually adjust seas somewhat higher over the ern
areas of the nrn and central CA waters at least for for today
into tonight to better reflect higher seas observed by buoy
report near the coast.

Extratropical Storm Surge Guidance: n/a.

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
     None.

$$

.Forecaster Shaw/Rowland. Ocean Prediction Center.



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