Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 261038

National Weather Service Eureka CA
338 AM PDT Wed Apr 26 2017

.SYNOPSIS...Moist northwest flow will continue rain chances
through this afternoon. Beginning Thursday, the weather pattern
will change drastically as an upper level ridge builds over the
Pacific Ocean. The result will be much drier and warmer conditions
compared to the current weather pattern.


.DISCUSSION...A week cold front will promote another morning of
rain across most of the CWA this morning.  A reinforcing
shortwave will move through behind the cold front, resulting in
additional burst of heavier precipitation a little later this
morning, focused over the northern coast and coastal mountains. As
the day progresses a few lingering showers are possible but the
air mass should dry out quite rapidly. By late afternoon heights
begin to rise in earnest due to an upper level ridge building off
the coast. This ridge will be responsible for a significant change
in the weather pattern expected for the remainder of the week and
into the weekend with no precipitation expected. A surface
thermal trough pattern will begin setting up Friday and the result
will be a return of spring time northerly winds for the forecast
area. As we head into the weekend, expect dry and mostly sunny but
breezy conditions along the coast during the afternoon and early
evening periods. Inland valleys should be quite pleasant with
sunny and warmer afternoons.


.AVIATION...Chances for precipitation will continue through
Wednesday with the majority of the precipitation occurring north of
Cape Mendocino. This will continue to support IFR to LIFR conditions
for KCEC and KACV through the morning hours and perhaps into the
early afternoon. Conditions will then start to dry out, however,
with lingering moisture and northerly winds MVFR conditions are
forecast. Come late Wednesday night into Thursday morning coastal
terminals should start to see VFR conditions.

Similar conditions are forecast for KUKI and interior terminals,
however, conditions may vary considerably more as precip chances are
not as high. Generally, look for VFR to MVFR conditions, but
conditions may drop down to IFR if a heavier shower moves through.


.MARINE...Winds will shift to the north today and are forecast to
persist through early May. High pressure will be taking control of
the forecast during this time frame which will tighten the pressure
gradient over our waters. Small craft advisories will eventually be
hoisted because of these winds with the southern outer waters
getting in on the action first by Thursday morning or early Thursday
afternoon. The northern outer waters will need a small craft
advisory as well by Friday morning with both then persisting through
the weekend. There is some uncertainty about the nearshore waters,
but this will be re-evaluated during the next few shifts.

In other marine news, a fresh short period swell will develop as a
result of the northerly winds while a westerly swell of 10-12
seconds persists through the weekend.



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