Area Forecast Discussion
Issued by NWS Eureka, CA
FXUS66 KEKA 252252
Area Forecast Discussion
National Weather Service Eureka CA
352 PM PDT WED MAY 25 2016
.SYNOPSIS...Isolated to scattered showers are expected over the
interior mountains this afternoon, then dry weather will stretch
through early next week. Coastal areas will see a mix of clouds
and sun as drier onshore flow continues.
.DISCUSSION...The upper trough will continue to be slowly fill
as it shifts farther SE away from the area tonight. This will
allow a decrease in instability and moisture as an upper ridge
edges closer to the Pacific coast. There will be a chance for
showers from the Trinity horn to the Yolla Bollys during this
afternoon and evening, but the chance for thunder is expected to
be minimal as instability parameters become less conducive and
atmospheric forcing wanes. Continued drying is expected into
Thursday with skies becoming partly cloudy to mostly sunny across
most of the area and little chance of additional rain. Patchy
valley fog will be possible each night and early morning. Low
clouds may continue near Humboldt Bay, particularly during the
overnight and morning hours. Near normal temperatures through
Thursday will warm to above normal levels over the interior by
Friday and Saturday with near normal values near the coast. Mostly
dry and seasonable to warm weather is expected to persist into the
middle of next week as a high pressure ridge remains over the E
Pacific and generally weak disturbances impact the Pacific NW.
.AVIATION...Conditions will be favorable for MVFR ceilings
tonight as an upper level trough maintains a deep marine
layer over the region. Stronger northerly flow in the boundary
layer tonight may prevent MVFR conditions from developing at
KUKI, however, both KACV and KCEC will see a return of low cloud
cover tonight. Breezy northerly winds should scatter out the low
clouds on Thursday.
.MARINE...North winds will continue to increase tonight as building
high pressure offshore pinches the pressure gradient across the
coastal waters. Winds will increase further on Thursday with gusts
around 35 kt by the afternoon for the outer waters as well as
nearshore around Point Saint George, Cape Mendocino, and Point
Arena. Small craft advisories remain in effect, however, near gales
are expected on Thursday. We have issued Gale Watches for the outer
waters beginning Thursday. Occasional gale conditions will continue
into Friday. Short period seas are expected to build Thursday and
then remain elevated through Fri. Winds should ease up slightly
north of Cape Mendocino on Saturday as a low pressure trough weakens
the offshore ridge. Seas will most likely remain steep and
uncomfortable through the weekend, however. A northerly wind flow
pattern will likely dominate early next week.
NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 11 PM PDT Friday FOR PZZ450.
Gale Watch from Thursday afternoon through Friday evening FOR
Small Craft Advisory until 5 PM PDT Thursday FOR PZZ470.
Small Craft Advisory until 11 PM PDT Friday FOR PZZ455.
Gale Watch from Thursday morning through Saturday afternoon FOR
Small Craft Advisory until 11 AM PDT Thursday FOR PZZ475.
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