904
FXUS66 KEKA 192142
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
242 PM PDT Sat Sep 19 2026

KEY MESSAGES...

* Warmer and drier interior temperatures into the weekend with
  interior highs in the 90s by Sunday.

* A shallow but strong marine layer forming close to shore with
  persistent marine clouds.

* Similar warm and dry conditions early next week with potential
  clearing near shore by Monday.


&&

.SYNOPSIS...High pressure building will allow for slightly warmer
than normal interior temperatures through the weekend. Meanwhile,
persistent marine stratus will hang along shore. Similar conditions
will continue into early next week.


&&

.DISCUSSION...High pressure continued to build today with the
hottest interior valleys reaching 90 under clear skies. A shallower
but persistent marine layer has formed along shore with gray skies
all day long around Humboldt Bay.

High pressure will continue to strengthen through the weekend. By
Sunday, highs for eastern interior valleys will most likely reach
the mid 90s. Marine influence will become increasingly shallow but
remain persistent along shore. Weak low pressure moving into the
Central California Coast around Tuesday will weaken high pressure,
but temperatures will most likely remain slightly above normal for
the interior. For the coast, the low could disrupt the marine layer
with weak offshore flow , allowing for some sunnier skies and warmer
temperatures by Monday and Tuesday.

Most ensemble members show high pressure reforming around Wednesday
and Thursday. This high pressure will most likely be moderate, but a
few members (10% chance) continue to show it stronger, possibly
allowing for some interior locations to graze 100 degrees. Most
ensemble members also show a weak cold front of some description
late in the week breaking the high pressure, but essentially none of
them show any wetting rain. /JHW


&&

.AVIATION...High pressure has enabled a persistent deck of marine
stratus all along shore through the day. Ceilings have barely lifted
to MVFR with just a few breaks expected through the afternoon.
Ceilings will almost certainly lower back to IFR by sunset, but true
LIFR conditions are relatively unlikely (25% chance) at terminals
with fog remaining diffuse. There is a slightly better chance of
clearing Sunday, but persistent stratus is most likely. Otherwise
VFR conditions persist all through the interior. /JHW

&

.MARINE...Moderate north winds have persisted in the southern waters
today, though winds have been much calmer close to shore. Seas have
been slow to rise, with buoys only showing seas to 5 feet around Pt.
Arena. Winds have remained more gentle in the northern waters. More
moderate northerly winds will push into the northern outer waters
Sunday. Short period wind waves will dominate the marine environment
building over 8 feet in the outer waters by Sunday night. There
remains only a very minor southwest mid period swell up to 2 feet to
speak of. /JHW


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 3 PM PDT Monday for PZZ455-475.

     Small Craft Advisory from 3 AM Sunday to 3 PM PDT Monday
     for PZZ470.

&&

$$

NOTE: The full forecast discussion is now regularly issued between
10 am/pm and 1 pm/am. Additional updates will be issued as needed.

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