Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 242344 CCA

National Weather Service Eureka CA
444 PM PDT Mon Apr 24 2017

.SYNOPSIS...Moist onshore flow will maintain rain chances across
the region through mid week. The pattern will then change by late
week as a ridge builds off shore over the Pacific, resulting in
warmer and drier conditions for northwest California.


Corrected Typo...

.DISCUSSION...Forcing for ascent is currently diminishing across
the region, which has resulted in a reduction in rainfall coverage
and intensity. This trend will persist going into Tuesday
morning, followed by reinvigoration of rainfall Tuesday afternoon
as another wave of ascent passes east across the area. Model
guidance indicates rainfall rates will peak Tuesday
night/Wednesday morning, and then quickly diminish Wednesday

After Wednesday, upper-level heights rise dramatically offshore
over the Pacific. This will yield a large-scale subsidence regime
favoring dry and mild conditions Friday through the weekend.
However, warming midlevel temperatures signal the potential for a
strengthening boundary layer inversion, which could support marine
stratus development impacting coastal communities...will continue
to evaluate. Otherwise...a tight surface pressure gradient is
forecast to develop in the vicinity of the coast as high pressure
strengthens west of the area. This surface pattern will support
northerly winds that could be gusty along the coast during late


.AVIATION...Conditions have been slowly improving at all
terminals this afternoon as weak high pressure builds up offshore.
Shallow moisture along with a W-NW flow will continue to bring a
threat of light showers and MVFR conditions to the coastal
terminals tonight. This threat will be highest at KCEC where all
the models indicate periods of light rain continuing through most
of tonight. Otherwise VFR will prevail tonight. Another front will
approach on Tuesday bringing a renewed threat for poor flying
conditions to both coastal airports. It may take til Tuesday
evening for steady rain with low ceilings and reduced vsbys to
develop at ACV and CEC. Conditions at KUKI should remain VFR
tonight. Low clouds will probably develop in the valleys north of
KUKI early Tue morning. Confidence that IFR ceilings will develop
at KUKI Tue morning is low at the moment.


.MARINE...Unsettled weather with periods of gusty winds will
continue into midweek...after which...surface high pressure will
develop offshore over the Pacific. This will yield northerly small
craft winds over most of the coastal waters, and the development
of a fresh short period swell. Otherwise, a westerly swell in the
10 to 15 second range will persist through much of the upcoming




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