635
FXUS66 KEKA 040716
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1216 AM PDT Mon Aug 4 2025

.SYNOPSIS...The last remaining impact of the passing cold front
will be felt Monday. Ridging building in this coming week will
warm temperatures.


&&

.DISCUSSION...A cold frontal passage Sunday stirred up gusty winds
inland Sunday afternoon. The upper level trough will ease up in
amplitude allowing for a more zonal synoptic flow early through the
week. This will bring calmer conditions with afternoon winds,
seasonal tempertures, and no thunderstorm/convective activity
expected for early this coming week. This zonal flow will end
midweek as an upper level trough over British Columbia migrates
eastward allowing for higher geo-potential heights & warmer air to
fill into the area. These warmer temperatures aloft will bring
warmer conditions on the surface as well.

Triple digit max temperatures possible this coming Friday (40-60%
prob.) and Saturday (60-80% prob.) in interior Humboldt and Trinity
County. Coastal warming expected this week as well with temperatures
increasing to the high 60s/low 70s by the weekend.


&&

.AVIATION...The upper level trough that continues to move over the
area is keeping the inversion weak and the marine clouds deep. This
is also keeping the marine clouds fractured and inconsistent. The
CIG heights vary quite a bit from place to place and are difficult
to predict. They may eventually settle down to IFR by sunrise. Skies
are expected to clear by midday in most areas on Monday. Monday
evening the coastal clouds are expected to return and the marine
clouds may be a bit lower and more consistent as the trough moves
out of the area. Inland areas are expected to remain clear. The
threat of storms has moved out of the area. MKK


&&

.MARINE...Monday the winds are expected to start to diminish,
but are expected to remain generally in the 10 to 20 kt range
through early Thursday. At this point it looks like the winds will
be the lightest on Wednesday. Late Thursday or Friday it looks like
stronger northerly winds will return, but this may be brief with
winds diminishing again on Saturday. Friday will likely see some
gale force winds or least gusts. At this point the models are not
consistent enough to increase the winds in forecast.

The waves are expected to continue to be mainly in response to the
local winds. The 1 to 2 foot southerly swell is currently moving
through the waters and there will likely continue to be some small
southerly swells at times over the next week. The first
northwesterly swell in a while is expected to move in the waters
Tuesday afternoon. This is expected to build to around 5 feet at 11
seconds by Wednesday evening and continue into Thursday. MKK


&&

.FIRE WEATHER...One more day of gustier winds is expected in Lake
County and interior Humboldt and Mendocino (FWZ 276//264/212) as the
last little bit of the upper level trough leaves the area Monday.
High resolution model data is having a hard time resolving the
daytime low relative humidities for the interior valleys, yet dry
conditions are forecast Monday. The Red Flag threat for the winds
and dry conditions is so localized around certain areas of southern
FWZ 264 with marginal conditions elsewhere. No thunderstorms are
expected for the


&&

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

&&

$$

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

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

Follow us on Facebook and Twitter at:
https://www.facebook.com/NWSEureka
https://www.twitter.com/NWSEureka

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