Dense Fog Advisory 2, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
337 AM PDT Sun Oct 3 2021

.SYNOPSIS...Dry weather and above normal temperatures will persist
across the interior through Monday, while periods of fog and
stratus along the coast give way to partial afternoon clearing. A
transition to cooler weather is forecast to occur across northwest
California during the middle of next week. In addition, periods of
light rain will be possible beginning Tuesday, with additional
chances existing during the second half of next week.

&&

.DISCUSSION...A large cyclonic gyre was centered over SERN AK this
morning, while a cut off low was positioned offshore from SRN CA.
An upper-level anticyclonic shear zone was located in between
those two features over NRN CA, which favors continued clear
skies across the region, with the exception of coastal stratus
and fog forming along portions of the Humboldt and Del Norte
coasts. Clear skies will support abundant surface heating this
afternoon, and again Monday afternoon, across interior portions of
NWRN CA. High temperatures will subsequently climb into the 90s
across the warmest valleys, with 80s occurring elsewhere.
Meanwhile, patches of nocturnal stratus forming along the coast
may burn off by afternoon and aid in afternoon high temperatures
in the 60s.

A pattern change is still expected during early to middle portions
of next week as an upper trough digs south over the NERN PAC.
Model guidance indicates an associated cold front will reach
coastal Del Norte County during Tuesday afternoon and aid in the
development of light shower activity. Showers may subsequently
spread across portions of Humboldt and Trinity Counties Tuesday
evening and night. The evolution of the previously mentioned upper
trough is uncertain by Thursday...but a series of shortwave
features moving through the larger wave signal continued low
precipitation chances lingering across the region during the
second half of next week. Otherwise, a cooler airmass will be
probable, and that may lead to patchy frost/freeze conditions for
colder wind sheltered interior valleys such as Hayfork.

Garner

&&

.AVIATION...The marine layer has gradually settled back in
overnight with LIFR conditions along the coast. A robust inversion
along with some marine layer compression evident on the ACV
profiler should keep low stratus around most of the day, with only
brief scattering to VFR in the early evening. Dry air from Oregon
may again help clear out Crescent City, but clouds will likely
prove particularly stubborn around Humboldt Bay. Another rapid
return of marine stratus is expected tonight with 1/4SM fog by
early morning. Continuing dry conditions in the interior will
allow VFR to prevail there. /JHW

&&

.MARINE...Northerly winds will remain elevated today with fresh
breezes in the outer waters and calmer conditions near shore.
Isolated near gale force gusts are possible around Cape Mendocino
and Pt. St. George. Seas will calm in the inner waters today, but
winds and short period seas will remain elevated enough in the
outer waters to continue small craft advisories into early Monday.
A brief lull is expected early this week before winds pick up
again early Wednesday, though the exact path of a surface low
pressure system lends significant uncertainty to this timing. A
new northwest swell of 7ft at 12s will move into the area today
which could lead to briefly unpredictable long period waves as it
overlaps with the currently diminishing northwest swell. /JHW

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 AM PDT this morning for PZZ450.

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

&&

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

Hazardous Weather Outlook
National Weather Service Eureka CA
302 AM PDT Sun Oct 3 2021

CAZ101>115-041015-
Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast-
Southwestern Humboldt-Northern Humboldt Interior-
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
Mendocino Coast-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
302 AM PDT Sun Oct 3 2021

This hazardous weather outlook is for northwest California.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.