North Pacific Marine Weather Discussion

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AGPN40 KWNM 232113
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
213 PM PDT Tue Oct 23 2018

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

A cold front was moving E over the northern and central areas of
the offshore waters early this afternoon. A coastal trof extended
across CA while a weak high pressure ridge was building in 
behind the cold front over the northern and central areas of the
offshore waters. A cold front will approach the northern and 
central areas of the offshore waters later tonight into Wed. The
cold front moves E across the northern and central waters late 
Wed and Wed night and appears to stall along the WA/OR and
northern CA waters. Models are similar with low pressure
approaching and moving NE towards the northern offshore waters
late Thu lifting a warm front N. The low pressure passes just NW
of the WA waters Thu night. Will still stay with winds to 30 kt 
in association with the cold front which moves into the WA/OR 
waters late Thu night and Fri. High pressure builds across the 
northern and central areas of the offshore Fri and Fri night. 
There still is significant divergence among the model guidance 
with the GFS still futher E with the cold front and a low 
pressure which it tracks into the waters Sun. Preference is still
with the UKMET/ECMWF which are slower with moving the front 
eastward. The ECMWF and UKMET mostly maintain a closed upper low
over the Gulf of AK while the GFS is more progressive with a 
short wave that it moves further E towards the offshore waters. 
The UKMET/ECMWF lift a warm front N across the northern CA/OR/WA 
from Sat and Sat night with a cold front moving E into the waters
Sun. 

Seas...Will use the WWIII ENP through about 00Z Sat, then favor
the ECMWF wam afterwards.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A.


.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
.PZZ800...Inner Waters from Cape Flattery to Cape Shoalwater...
     Gale Wednesday night.
.PZZ900...Outer Waters from Cape Flattery to Cape Shoalwater...
     Gale Wednesday into Wednesday night. 
     Gale Possible Saturday night.
.PZZ905...Outer Waters from Cape Shoalwater to Cape Lookout...
     Gale Wednesday.
     Gale Possible Saturday night.

.PZ6 California Waters...
     None.

$$

.Forecaster Rowland. Ocean Prediction Center.