Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 201100

National Weather Service Eureka CA
400 AM PDT Wed Jun 20 2018

.SYNOPSIS...Warm and dry conditions will persist across inland
areas for the foreseeable future, with more notably hot
conditions Friday through Sunday. An isolated thunderstorm will be
possible in far northeast Trinity county late this afternoon.
Marine clouds will persist along the coast through Friday
morning, and very little sun can be expected this afternoon. More
sun is expected along the coast Friday and beyond.



.COAST...A strong marine layer inversion continues to bring
widespread stratus and periodic drizzle along much of the coast
overnight tonight...generally reaching up to around 2000 to 2500
feet along coastal ridges. Through the day today, a passing upper
level disturbance will likely help to deepen the marine layer a
bit, but the inversion itself will remain strong and this will
limit the amount of clearing that takes place during the afternoon
along the coast. All that is to say that the coastal lowlands
will likely remain cloudy for the majority of the day, aside from
a few pockets of sun here and there. Widespread marine clouds will
persist through at least Friday morning, with perhaps a few more
breaks in the clouds during the afternoon Thursday.

Friday afternoon through the weekend...a ridge of high pressure
will help to shrink the depth of the marine layer, while
increasing northerly winds should help to clear out some of the
marine layer clouds. As a result, increasing sun can be expected
along the coast Friday and beyond, with slightly warmer
temperatures as well. This will be especially true Saturday, when
temperatures may approach 70 degrees in the coastal lowlands.

.INLAND...Another warm and dry day can be expected across most
interior areas, again with afternoon temperatures likely to reach
into the upper 80s to low 90s across interior valleys. However,
the lone exception in this region may be the far northeastern
corner of Trinity county, as a brief thunderstorm or two will be
possible during the later afternoon. Instability and wind shear
will support the development of thunderstorms in this
area; however, storms will likely quickly move to the north and
into Siskiyou county before they become particularly strong. In
fact, it is more likely that storms initiate farther to the north
in Siskiyou county anyways, completely missing Trinity County
altogether. In any case, should a storm develop there, cloud to
ground lightning and small hail will be possible for a brief

Otherwise, the primary item of interest for the next several days
will be heat, as upper level high pressure will quickly build into
the region Thursday and beyond. Most residents can expect a
similarly warm day Thursday, with more noticeable heat expected
Friday through Sunday. Over those three days, many interior
valleys will climb into the upper 90s and low 100s...perhaps
reaching the 105 mark in the Ukiah area. While these temperatures
are not particularly out of the ordinary for our area, a Moderate
Risk of adverse health effects may develop for those sensitive to
heat over the weekend.

A modest cooling trend will begin Monday and last through the
middle of next week, although temperatures will remain warm and
generally slightly above normal. No additional thunderstorms, or
precipitation for that matter, are expected. /BRC


.AVIATION...Stratus continues to impact both ACV and CEC this
morning with IFR to LIFR ceilings and visibilities. UKI has
remained clear as of 4am however stratus is currently at the
Sonoma/Mendocino border and steadily moving to the north. By
sunrise UKI may see scattered to broken low clouds near the
airport and persist for a few hours before dissipating by late
morning. Due to an upper level system swinging by today; IFR to
LIFR ceilings should remain locked in at both ACV and CEC through
the entire period. Periods of drizzle will also reduce
visibilities at ACV and CEC at times through early this afternoon.


.MARINE...Latest ASCAT pass this morning shows light northerly
winds in place across the southern waters with very light to calm
winds across the northern waters. Surface high pressure will
continue to build across the area today which will cause northerly
winds to continue to gradually strengthen. Seas on the other
hand, will continue to gradually subside for the next few days as
a westerly and northerly swell continue to decay.

Winds will really begin to strengthen tomorrow evening south of
Cape Mendocino and across all of the waters by Friday. Gale force
conditions are possible across the waters beginning on Saturday,
leading to steep and hazardous seas. Strong winds and steep seas
will persist through at least the middle of next week. /WCI




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