marine weather discussion for N Pacific Ocean NWS ocean prediction center Washington DC 220 am PDT sun Apr 20 2014
.Forecast discussion: major features/winds/seas/significant .Weather for the North Pacific N of 30n and E of 150w.
The Sat img indct no comnv clds ovr the region but clds assctd with a frntl bndry approaching from the W. The radar has no indc of tsms ovr the region. At 20/0600z a wkng cld frnt lies acrs the far srn wtrs. Hgh pres 1026 mb cntrd ovr the wrn edge of the cntrl cal wtrs has a wk ridge xtndg NE acrs the cntrl region and another ridge xtndg se passing just W of the srn region. An area of low pres sysms strtches from the Gulf of AK with one low pres 988 mb cntrd nr 45n145w. The pres grdnt is fairly slack ovr most of the region xcept the nrn wtrs where the Max obs winds are 30 kt. The latst ascat pass at 0450z had 30 kt winds ovr the NW wtrs and had 10 kt winds ovr the srn wtrs.
Seas...the hghst seas are still confined to the NW region with 27-ft peaks while the lowest seas are still 6 ft ovr the srn wtrs. The nww3 multi-grid continues to fit very well with the obsvd seas pattern and has been quite consstnt and even in areas with hgh winds and seas and is in a gud agrmnt with the ecmwfwave and so no need to deviate from it even for this fcst pckge.
The glbl mdls hv equally continued to initilaize well and they are in some decent agrmnt espclly in the short term and so will stay with GFS for this pckge. In the short term the hgh pres W of the region will remain nrly stnry but will dsipt Mon allowing the frntl sys to penetrate farther S acrs the region. The pres grdnt will remain slack ovr the srn wtrs while it will briefly tighten ovr the far nrn wtrs and allow gale force winds to briefly impact The Wash wtrs. In the xtndd prd the pres grdnt will slacken ovr the nrn wtrs but will become tight as inland low pres deepens and that will elevate winds ovr small area of the ern parts of the srn wtrs...then again ovr the nrn wtrs late in the xtdd prd.
.Extratropical storm surge guidance...N/A.
.Warnings...Preliminary. Any changes will be coordinated through AWIPS 12 planet chat or by telephone:
.Pz5 Washington/Oregon waters... .pzz800...inner waters from Cape Flattery to Cape Shoalwater... gale possible Wed night. .Pzz900...Outer waters from Cape Flattery to Cape Shoalwater... gale today. Gale possible Wed night.
.Pz6 California waters... .pzz840...inner waters from Santa Cruz Island, CA to San Clemente Island, CA... gale possible Tue into Tue night.
.Forecaster musonda. Ocean prediction center.