Chicago Park, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

030
FXUS66 KEKA 010730
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1230 AM PDT Fri Aug 1 2025

.SYNOPSIS...Chance of thunderstorms over the interior of Northwest
California through Friday. Storms may produce gusty outflow winds,
heavy rain and hail. Interior thunderstorms will be possible over
the weekend, primarily on Sunday.


&&

.DISCUSSION...Friday will feature another round of thunderstorms,
confined to mostly the northern Trinity mountains and eastern
fringes of Del Norte and NE Humboldt along the Siskiyou County
border. Potential for thunderstorms decrease substantially on
Saturday with drier westerly flow spreading across the area and
higher 500mb heights. A colder trough will approach on Sunday
bringing yet another round of showers and thunderstorms to the
interior mountains. Otherwise, this trough will bring cooler temps
and gusty westerly and northwesterly winds Sun and into Mon.

Interior temperatures will likely begin to warm by mid next week.
How warm remains uncertain. 500mb heights pump up to 588DM or
more by late next week and suspect some of the typically hot
valley locations will reach or exceed 100F. The risk for a long
duration heat wave may be mitigated by persistent and frequent
troughs busting down on the ridge from the NW. Deterministic
models are starting to indicate a flow pattern favorable for more
interior convection and thunderstorms late next week with a closed
500mb circulation offshore the California coast and ESE winds
aloft.


&&

.AVIATION...A trough moving over the area is keeping the marine
layer deeper and not as consistent. The CIGS are expected to drop
towards morning, but not expected to get below minimums for any
length of time.  Ceilings along the coast are expected to gradually
lift to MVFR into the afternoon, but widespread clearing isn`t
expected. Inland areas are expected to see some gusty northwest
winds in the afternoon. There is also a threat for some
thunderstorms in Trinity county in the afternoon. MKK


&&

.MARINE...An upper level trough moving over the region is keeping
the winds around 15 to 25 kt with the stronger winds south of Cape
Mendocino. The waves are mainly short period and driven by the local
winds. These are stronger south of Cape Mendocino where they peak
around 7 feet. These conditions are generally expected to last
through the weekend and into next week. The winds north of Cape
Mendocino may increase slightly. The waves are expected to be mainly
in response to the local winds. There may be a few small southerly
swells at times through the week.

The Tsunami continues to produce small waves. These are mainly less
than a foot even in Crescent City, but they continue to show up
distinctly on the tide gauges. These continue to diminish, but are
expected to continue to bring some increased currents and surges
over at least the next 24 hours and possibly longer. MKK


&&

.FIRE WEATHER...We will continue to include a headline in the
fire weather forecast for isolated to scattered thunderstorms and
possible new ignitions. Another trough will approach on Friday in
the SW flow aloft. This should maintain the threat for storms and
isolated dry strikes for the Klamath Mountain, mostly in Trinity
County. Temperatures aloft and stability will likely increase on
Saturday and result in a significant reduction in thunderstorms
probabilities for our forecast area. A short wavelength trough
will approach on Sunday and then progress across the area Sunday
night. Granted the trough may slow down and arrive as late as
Monday. This trough will bring another round of showers and
thunderstorms for the Klamath Mountains. This trough on Sunday
will likely induce stronger westerly to northwest winds for our
typically dry and windy areas; Lake, southern Mendocino and
eastern Trinity.


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 10 PM PDT Saturday 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.

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