Special Weather Statement, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1228 PM PDT Fri Aug 1 2025

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

&&

.DISCUSSION...A recurring theme of late afternoon convective
weather continues today. The usual areas of the eastern flank in
our CWA to include northern Trinity mountains and the 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...18Z TAFs...Coastal stratus has started to erode late
this morning. The profiler at ACV is showing a marine layer around
700 ft. While some lifting is possible in the afternoon, ceilings
are likely to remain IFR to MVFR. In the interior, outside of the
slight chance for thunderstorms in Trinity County, mostly clear
skies and breezy northwesterly winds are expected this afternoon.
This evening, winds ease and stratus returns to the coastal
terminals. Models are hinting at a shallower marine layer, but an
approaching trough may actually deepen the marine layer. Ceilings
are likely to remain in the IFR or MVFR categories, with brief drops
to LIFR possible. Reduced visibilities are also possible, though
confidence is lower on how low they will drop. Higher ceilings and
visibilities are likely by the late morning. JB

&&

.MARINE...An upper trough continues to keep winds relatively
subdued, especially north of Cape Mendocino. Peak afternoon
northerly gusts of 15-25 kts are still possible, with locally
stronger winds possible in the lee of Cape Mendocino. Seas remain
primarily wind driven, with steep seas of up to 7 ft possible south
of Cape Mendocino. These conditions continue into the weekend and
into early next week.

Lingering tsunami waves continue to show on the tide gauges along
the coast, especially around Crescent City. Even though heights are
less than 1 ft, increased currents and surges are still possible.
These waves will continue to gradually subside over time. JB

&&

.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 3 PM PDT Sunday 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

Special Weather Statement
National Weather Service Eureka CA
234 PM PDT Fri Aug 1 2025

CAZ107-012200-
Northern Trinity CA-
234 PM PDT Fri Aug 1 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTH CENTRAL TRINITY COUNTY
UNTIL 3 PM PDT...

At 234 PM PDT, Doppler radar was tracking a strong thunderstorm 13
miles northwest of Carrville, or 32 miles north of Weaverville,
moving northeast at 15 mph.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Mainly rural areas of North Central Trinity County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

Torrential rainfall is also occurring with this storm and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4106 12283 4110 12297 4111 12297 4112 12296
      4114 12296 4115 12295 4118 12296 4119 12295
      4118 12293 4119 12292 4120 12289 4120 12284
      4121 12283 4120 12280 4122 12278 4123 12278
      4125 12273 4127 12272 4126 12268
TIME...MOT...LOC 2134Z 210DEG 11KT 4122 12286

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH

DB

Special Weather Statement
National Weather Service Eureka CA
250 PM PDT Fri Aug 1 2025

CAZ108-012215-
Southern Trinity CA-
250 PM PDT Fri Aug 1 2025

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL TRINITY COUNTY UNTIL
315 PM PDT...

At 250 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Peanut, or 14 miles south of Hayfork, and is
nearly stationary.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Mainly rural areas of Central Trinity County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

Torrential rainfall is also occurring with this storm and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4032 12306 4036 12311 4047 12306 4045 12299
      4042 12299 4042 12300 4040 12300 4038 12302
      4037 12302 4036 12303 4036 12304 4035 12304
      4035 12306 4034 12306 4033 12307
TIME...MOT...LOC 2149Z 225DEG 2KT 4037 12306

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH

DB

Special Weather Statement
National Weather Service Eureka CA
300 PM PDT Fri Aug 1 2025

CAZ107-108-012230-
Southern Trinity CA-Northern Trinity CA-
300 PM PDT Fri Aug 1 2025

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL TRINITY COUNTY UNTIL
330 PM PDT...

At 300 PM PDT, Doppler radar was tracking a strong thunderstorm 6
miles north of Hayfork, moving northeast at 5 mph.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Hayfork.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

Torrential rainfall is also occurring with this storm and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4066 12323 4075 12320 4070 12304 4061 12318
      4064 12324
TIME...MOT...LOC 2200Z 211DEG 4KT 4066 12318

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH

DB

Special Weather Statement
National Weather Service Eureka CA
307 PM PDT Fri Aug 1 2025

CAZ108-012230-
Southern Trinity CA-
307 PM PDT Fri Aug 1 2025

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL TRINITY COUNTY
UNTIL 330 PM PDT...

At 307 PM PDT, Doppler radar was tracking a strong thunderstorm near
Peanut, or 8 miles southwest of Hayfork, and is stationary.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Hayfork and Peanut.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.

Torrential rainfall is also occurring with this storm and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4050 12311 4042 12325 4052 12337 4059 12327
TIME...MOT...LOC 2206Z 0DEG 0KT 4048 12323

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH

DB

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>