000
AGPN40 KWNM 040845
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
145 AM PDT Tue Aug 4 2020

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

The ASCAT pass from 04Z indicates the strongest winds are
occurring over the coastal waters along the central and northern
California coasts. 20-30 kt winds are found in these areas. A
ridge axis also is indicated along the western portion of the
Washington and Oregon waters. The overall forecast pattern has
not changed much over the past few days. An elongated ridge axis
S of 40N extends E toward the California waters, while a low
pressure trough persists along the California coast. The
resulting pressure gradient is producing the enhances winds in
the California waters. Later in the week the area of high
pressure will build NE, tightening the gradient along the
northern california coast. It is this reason that the best chance
for gales will occur on days 5 and 6, beginning in the coastal
waters, then expanding W towards the offshore waters. At this
time I am not forecasting any gale warnings through the forecast
period, although they might need to be added in future packages
if this trend continues. Further N, the pattern across the
Washington and Oregon waters continues to be progressive. Weak
frontal boundaries will pass over the waters, while the
associated surface low stays N of the waters, therefore the
chance of any gale conditions across the region is very low
during the upcoming week. The 00Z global models are in very good
agreement throughout the entire forecast period. I will populate
the wind grids using a 50/50 blend of the GFS and ECMWF over the
next 7 days.

Seas...Both the WAM and ENP were initialized well at 00Z and
offer similar forecast solutions during the upcoming week. I
will populate the wave grids using a 50/50 blend of the two
models during the entire forecast period.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
None.

.PZ6 California Waters...
None.

$$

.Forecaster Shaw. Ocean Prediction Center.