Humboldt Hill, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

617
FXUS66 KEKA 212125
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
225 PM PDT Sat Jun 21 2025

.SYNOPSIS...Isolated light showers this afternoon, mainly in Del
Norte County. Gusty west and northwest winds continue for the
interior today and Sunday. Below normal temperatures are expected
for the interior this weekend. A warming and drying trend early to
mid next week.

&&

KEY MESSAGES:

* Elevated to locally critical fire weather conditions through
  this evening for Lake, eastern Mendocino and eastern Trinity
  Counties due to low RH`s and strong west and northwest winds.

* Gusty and locally strong coastal northerlies through this
  evening.

* Isolated light showers this afternoon in Del Norte County and
  over the Trinity Alps.


* Cooler interior temperatures this weekend, followed by a
  warming and drying trend early to mid next week.

&&

.DISCUSSION...A deep upper-level trough continue during southward
this afternoon. Isolated light showers are expected to develop
on the backside of the aforementioned trough this afternoon,
primarily for Del Norte and NE Trinity. Otherwise, dry and cooler
weather is forecast to prevail this afternoon and for the rest of
the day. Breezy to gusty northwesterly winds continue through this
evening across the area, with the strongest winds over the
coastal headland and exposed ridges in Mendocino and Lake
counties. Gusts from 25-35 mph are likely (65-75% chance), but
higher terrain and ridges may even gusts up to 40 mph. Gusty, dry
northwesterly winds continue to yield in low humidity across
eastern Trinity, eastern Mendocino and Lake counties (see fire
weather section for details).

Tonight, clearing skies are expected in the backside of the
trough. This may allow patchy fog to form in the valleys with the
lingering moisture. If skies clear out and winds go calm, patchy
early morning frost will be possible (40% chance) for Trinity
County (Hayfork) and NE Mendo (Covelo) on Sunday. As result, there
is a chance for temperatures falling to 36F or less for a few
hours right before sunrise.

A warming and drying trend is forecast early to mid next week
with highs in the lower to mid 90`s Tuesday and Wednesday for the
interior valleys. Morning coastal stratus return on Tuesday,
lifting and mixing during the afternoon hours.

Ensembles and deterministic are showing a series of shortwave
moving across the area Wednesday through late next week. The
scenario with those shortwaves would bring temperatures few
degrees cooler, but may also increase west to northwest winds. ZVS




&&

.AVIATION...(18z TAF)...Building north wind has helped to quickly
scour out any low clouds along the coast this morning, supporting
generally VFR conditions. Winds gusting up to 25 kts and producing
areas of haze will be the main aviation hazard this afternoon with
otherwise VFR conditions across the interior.

Overnight conditions show much more uncertainty. About 60% of models
show MVFR ceilings forming overnight along shore, 40% stay totally
clear. On the other hand, 20% show Even low IFR ceilings, though any
ceiling formation below about 1 kft AGL is unlikely. Timing is
similarly uncertain with the most aggressive models forming ceilings
by around 03z but other pushing it off as late as 09z. Though the
exact outcome is uncertain, there is very little chance (10%) of
LIFR conditions. Gusty north winds will most likely again help
ceilings lift quickly Sunday morning. /JHW


&&

.MARINE...A deep trough is continuing to push inland Saturday, which
has helped pull moderate to strong north winds close to shore. While
winds are gentle in the northern waters, gale conditions are
expected late Saturday afternoon in the southern inner waters around
Ft. Bragg. Enhanced though slightly weaker conditions will remain
Sunday and spread throughout the northern waters by Sunday night
with gusts of 25 to 30 kts. Similar gusty conditions will continue
through at least mid next week as high pressure gradually forms along
shore. The state will mostly be controlled by short period wind waves
as steep as 8 feet at 8 seconds. A very minor northwest swell up to
4 feet at 12 seconds will start to build around Sunday night through
next week. /JHW


&&

.FIRE WEATHER...Breezy to gusty westerly and northwesterlies
breezes today and Sunday. Afternoon humidity in the 20`s to low
30`s percent in eastern Trinity, eastern Mendocino and Lake
counties. The combined of gusty west-nortwest winds yield in
elevated fire weather conditions in zones 264, 277 and 283 through
Sunday. Risk for small and fast spreading grass or brush fires
will increase. Overnight RH recoveries will be good across the
valleys, with moderate humidity recoveries over the higher terrain
in SE Mendocino and Lake counties.

A warming trend is forecast early through mid next week as a
surface high pressure build in. Daytime RH`s trend down as
temperatures increase next week into mid 90`s.

Wednesday through late next week models are in a good agreement
on a series of shortwaves moving across the area. At this point,
ensembles remain dry with temperatures few degrees colder.
However, low afternoon RH`s values and enhancing west`northwest
winds will promote elevated fire weather conditions in Trinity,
interior Mendocino and Lake counties. ZVS




&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Gale Warning from 3 PM this afternoon to 11 PM PDT this
     evening for PZZ455.

     Small Craft Advisory from 11 PM this evening to 9 PM PDT
     Monday for PZZ455.

     Small Craft Advisory from 9 PM Sunday to 9 PM PDT Monday
     for PZZ470.

     Small Craft Advisory from 3 PM this afternoon to 9 PM PDT
     Monday for PZZ475.

&&

$$

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