Marine Interpretation Message
Issued by NWS
AGPN40 KWNM 250834
Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
134 AM PDT Sat Mar 25 2017
.FORECAST DISCUSSION...Major features/winds/seas/significant
.weather for the North Pacific N of 30N and E of 150W.
At 06z a high pressure ridge extended across the PZ5 waters down
into the northern and southern parts of the PZ6 waters. A cold
front extended northeast to southwest across the central PZ6
waters. ASCAT high resolution pass from near 0555z revealed 10-20
kt winds over the PZ5...most of the PZ6 waters w of 121w...except
for the inner central PZ6 waters were winds as low as 5 kt were
Continued good agreement through Mon morning when viewing the
00z model package...hence populated through Mon morning with the
00z GFS which still results in current warning headlines
remaining in place. Good confidence in pre-frontal gales ahead of
the cold front progged to move through the waters Sat night into
Sun. Beyond that period there are some differences in regards to
exact location and timing of low pressure expected to slide
somewhere north of the PZ5 waters Mon night into Tue with the 00z
UKMET having the strongest solution at the moment.
However...despite the differences to the north...further south of
the PZ6 waters guidance remains in good agreement in terms of
strengthening north to northwesterly winds across parts of the
central and southern PZ6 waters as the pressure gradient tightens
in response to inland troughing and a high pressure ridge to the
west. That said because of the differences noted over the PZ5
waters feel it`s reasonable to not make adjustments to the grids
at all beyond Mon morning at this point. Hence winds will
continue to remain below warning criteria over parts of the
central and southern PZ6 waters for now...though again
possibility of gales will continue to be monitored.
.SEAS...Populated using 00z NWW3 through about Sun 06z then from
Sun 12z on continued with ongoing grids which consisted of blend
of the 12z NWW3/ECMWF WAM with additional adjustment to the seas
in the pre-frontal gales.
.EXTRATROPICAL STORM SURGE GUIDANCE...n/a.
.PZ5 Washington/Oregon Waters...
.PZZ800...Inner Waters from Cape Flattery to Cape Shoalwater...
.PZZ900...Outer Waters from Cape Flattery to Cape Shoalwater...
Gale tonight into Sunday.
.PZZ805...Inner Waters from Cape Shoalwater to Cape Lookout...
.PZZ810...Inner Waters from Cape Lookout to Florence OR...
.PZZ815...Inner Waters from Florence OR to Point St. George...
.PZ6 California Waters...
.Forecaster Holley. Ocean Prediction Center.