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Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 022205
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
305 PM PDT Tue Jun 2 2020

.SYNOPSIS...Well above normal interior temperatures are expected
today through Thursday, with temperatures reaching well into the
90s. Coastal areas will remain cool, with highs only reaching into
the 60s. A cooling trend will begin Friday, with well below
temperatures and showers expected over the weekend, with a few
thunderstorms possible as well.

.DISCUSSION....DISCUSSION...Building high pressure has resulted in clearing skies
throughout northern California, with well above normal temperatures
across interior areas. Afternoon readings across low lying valleys
not affected by the marine layer will peak in the upper 80s to mid
90s over the next hour or two, before settling into the upper 50s to
low 60s overnight. Meanwhile, coastal areas continue to experience
typically cool conditions, with afternoon temperatures generally in
the upper 50s to low 60s.

High pressure will continue to build tomorrow, and interior
temperatures are expected to climb another 3 to 5 degrees as a
result. This slight increase is enough to bring afternoon
temperatures within range of a Heat Advisory, although mild
overnight low temperatures in the upper 50s to mid 60s will continue
to provide relief after the heat of the day. While several areas
will see afternoon temperatures in the mid to upper 90s, it will be
the southern areas of Mendocino and Lake Counties that will likely
reach near 100 degrees, with slightly warmer morning and overnight
temperatures as well. As such, a Heat Advisory has been issued for
portions of southern Lake and Mendocino counties for Wednesday
afternoon, including the greater Ukiah and Clearlake areas. Above
normal temperatures are expected again Thursday, although likely
slightly cooler overall. The marine layer will continue to maintain
it`s grip along the coast, with typical cool temperatures expected
to continue.

High pressure will begin to loosen its hold on the area Friday, and
temperatures will be noticeably milder as a result. On Saturday a
rather deep and unseasonably cool low pressure system will impact
northern California and Oregon. Confidence is increasing that this
system will bring showers and perhaps a few thunderstorms to the
area Saturday and possibly Sunday as well, especially from Cape
Mendocino northward. Meanwhile, temperatures will plunge to well
below normal for interior areas, perhaps low enough to bring snow
levels all the way down to around 4500 to 5000 feet. While snow is
not expected on any major travel corridors, it is very possible that
higher terrain could see some light snow accumulations, particularly
on Saturday night and Sunday. This will primarily be a nuisance for
outdoor recreation, particularly hikers or backpackers in areas like
the Trinity Alps.

While there remains some uncertainty regarding just how long
precipitation will linger, in general it appears that a drier
pattern will develop early next week, with slowly warming
temperatures as well.

.AVIATION...Mostly VFR conditions are expected at all terminals
through early this evening. KCEC should remain VFR through the TAF
period, but some statistical guidance does suggest low clouds may
lower conditions early in the morning. KACV will likely have at
least vicinity stratus develop overnight. Lower ceilings and/or
visibilities are expected. KUKI will remain VFR through the TAF
cycle.

.MARINE...Moderate to strong northerly breezes will continue
through early Friday over the outer waters and around Cape
Mendocino and Point Saint George. Occasional gusts to Gale Force
in strength will be also be possible in these areas. Small Craft
Advisories are in place for the inner zones through late tomorrow
and through Thursday night for the outer zones. Conditions are
expected to begin to improve Friday morning. Otherwise, a longer-
period southwest swell will linger through the forecast period,
with another northwest swell moving through the waters starting
Wednesday.

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from noon to 8 PM PDT Wednesday for CAZ113-115.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 9 PM PDT Wednesday for PZZ450-455.

Small Craft Advisory until 3 AM PDT Friday for PZZ470-475.

Visit us at https://www.weather.gov/eureka

For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png

National Weather Service Weather Forecast Office