Marine Interpretation Message
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000
AGPN40 KWNM 190710
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
1210 AM PDT Sat Aug 19 2017

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

Summary...The 06z OPC preliminary surface analysis shows a weak
cold front extending across the Oregon offshore waters.
Otherwise, the analysis shows a low pres trough over California
interacting with a high pres ridge over the offshore waters to
produce a tight pressure gradient in the southern Oregon and
northern California waters. Latest available ascat passes from
tonight show 20 to 25 kt winds in the northern California
offshore waters in northerly flow, although there was not any
coverage in the coastal waters.

Models...The 00z medium range models are in good overall
agreement across the offshore waters through the forecast period,
except the 00z ecmwf is somewhat faster than the other models
with a cold front moving SE over the PZ5 waters on Tue into Wed.
Will use the representative 00z gfs 30m solution for the wind
grids, since it supports gales in the southern Oregon and
northern California coastal waters where the coastal WFO`s have
gale warnings in effect.

Seas...The highest seas reported were in the 12 to 13 ft range
W of Cape Mendocino. Will use the 00z enp wavewatch for the sea
height grids through the forecast period, because it initialized
well over the waters and has good support from the 00z ecmwf
wam. Am planning to boost the 00z enp wavewatch somewhat for
today through Sun in order to match up better with the conditions
expected by WFO Eureka.

.Extratropical Storm Surge Guidance...N/A.

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Saturday into Sunday.
     Gale Possible Sunday night.

$$

.Forecaster Scovil. Ocean Prediction Center.


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