Severe Thunderstorm Warning 4, NWS Eureka, CA

134 
WWUS56 KEKA 252221
SVSEKA

Severe Weather Statement
National Weather Service Eureka CA
321 PM PDT Fri Jul 25 2025

CAC105-252245-
/O.CON.KEKA.SV.W.0004.000000T0000Z-250725T2245Z/
Trinity CA-
321 PM PDT Fri Jul 25 2025

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM PDT 
FOR SOUTH CENTRAL TRINITY COUNTY...

At 321 PM PDT, a severe thunderstorm was located 17 miles south of 
Peanut, or 24 miles south of Hayfork, moving northwest at 10 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage
         to roofs, siding, and trees.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from 
windows. This storm is capable of producing damaging winds and large 
hail.

&&

LAT...LON 4015 12299 4014 12314 4038 12330 4040 12300
      4038 12302 4037 12302 4036 12304 4035 12304
      4035 12306 4033 12307 4031 12306 4030 12307
      4029 12307 4027 12305 4026 12302 4024 12298
      4021 12298 4019 12297
TIME...MOT...LOC 2205Z 155DEG 9KT 4019 12305

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MH

686 
WWUS56 KEKA 252243
SVSEKA

Severe Weather Statement
National Weather Service Eureka CA
343 PM PDT Fri Jul 25 2025

CAC105-252253-
/O.EXP.KEKA.SV.W.0004.000000T0000Z-250725T2245Z/
Trinity CA-
343 PM PDT Fri Jul 25 2025

...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 345 PM PDT FOR SOUTH 
CENTRAL TRINITY COUNTY...

The storm has decreased below severe limits. However, small hail, 
gusty winds, and heavy rain are still possible with this 
thunderstorm.

&&

LAT...LON 4015 12299 4014 12314 4038 12330 4040 12300
      4038 12302 4037 12302 4036 12304 4035 12304
      4035 12306 4033 12307 4031 12306 4030 12307
      4029 12307 4027 12305 4026 12302 4024 12298
      4021 12298 4019 12297
TIME...MOT...LOC 2221Z 155DEG 9KT 4023 12307

$$

MH

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
207 PM PDT Fri Jul 25 2025

.SYNOPSIS...Thunderstorms are possible through late tonight. Near
normal to slightly below normal temperatures expected for the next
few days. Temperatures trend slightly upward towards the later
parts of next week.

&&

.DISCUSSION...Early this morning around 13z, a small cell of
convective thunderstorms moved through interior Humboldt near
Bridgeville and continued on a southwest trajectory before
fizzling out. The ingredients for convective weather continues
through the afternoon and well into this evening. As of 2030z,
cells have popped up in the Trinity Horn and south of the Yolly
Bolly district near the southeastern Trinity/Tehama border. With
PWAT values near 1.0-1.2 and EQL levels showing elevated CAPE, we
are expecting convective activity through late tonight which also
includes small hail and the possibility of strong outflow winds
of up to 50+mph as the high based thunderstorms drop out. A
progression from the northeast to southwest has the steering and
flow hinting at movement into Lake or eastern Mendocino counties.
In general, the upper-low inches more northeasterly, bringing a
similar setup to yesterday, but moves slightly south and east.
Confidence has increased on thunderstorms forming across Trinity
County, eastern Mendocino, and northern Lake Counties. CAPE may be
even higher (nearing 1000 J/kg) with DCAPE remaining near 1000
J/kg. Higher shear in the Yolla Bollys may allow for some longer-
lasting storms, but elsewhere shear remain weak. Storms will
likely form and collapse quickly, bringing gusty outflow winds.
The previously mentioned high PWATs of an inch or more could
support periods of heavy rain.

The low moves to the east Saturday, bringing most mid-level moisture
with it. Thunderstorm chances significantly decline, and if any
form, the Trinity Horn is the most likely area. Sunday and into the
middle of next week high pressure is expected to generally remain
east of the area. This will keep temperatures near seasonal normals
with highs in the upper 80s to low 90s. Thunder potential generally
looks to remain low. Ensembles are hinting at another upper-low
forming right off the coast, which may return thunderstorm chances
mid next week, and this will need to be watched.

&&

.AVIATION...(18Z TAFs) IFR conditions remain through the morning
along the coast. Through the day cloud ceilings are likely (70-90%)
to scatter away  to as daytime mixing takes effect around 21-02Z to
give MVFR/VFR conditions. IFR conditions (60-80%) expected to return
and remain through tonight and tomorrow morning. Probabilities for
LIFR conditions are 30-40% and are not expected for coastal areas.

Inland, river valley clearing will lead to VFR conditions. A
thunderstorm threat this afternoon is possible in eastern Humboldt,
NE Mendocino, & Trinity county with NBM showing (a 30-40%
probability of lightning from 21Z-06Z today. Calm conditions
expected late tonight through the morning inland.

&&

.MARINE...An upper level cutoff low will lurk off the Central
California Coast and will remain in the vicinity through Friday and
develop into an open upper level trough for the weekend. This will
continue to keep the surface pressure gradient, holding winds to
gentle to moderate levels through the weekend. Seas 2 to 5 feet are
expected, with the lightest conditions expected nearest the coast.
Winds are expected to be mostly northerly with south/southwest winds
likely directly adjacent to the coast, especially overnight as
southerly reversals form. The northerlies will be slightly stronger
today , mainly through the southern outer zone, with sustained winds
likely remaining mainly below 20 kts through the weekend, except for
a small localized area south of Cape Mendocino where wind gusts will
increase to 20 to 25 KTS from the north/northwest. Wind waves are
forecasted to increase slightly during the daytime areas in this
area as well. MH/DS

&&

.FIRE WEATHER...Friday, isolated to scattered thunderstorms shift
south and east with the highest confidence in Trinity, eastern
Mendocino, and northern Lake. Isolated storms are possible in
eastern Humboldt, as well. Again gusty, erratic outflow winds of
50 mph are possible and a brief heavy downpour is not out of the
question. A Red Flag Warning has been issued for abundant
lightning in Trinity, eastern Mendocino, and northern Lake
Counties. Thunderstorm chances decrease this weekend.

Outside of thunderstorms, winds are generally expected to be fairly
light and terrain driven. Interior Temperatures are generally
expected to be around or slightly below seasonal normals with highs
in the 80s to low 90s. Dry afternoon RHs in the 20s are possible in
the eastern portions of the area, but good overnight recoveries are
likely. JB

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Red Flag Warning until 11 PM PDT this evening for CAZ212-
     277-283.

NORTHWEST CALIFORNIA COASTAL WATERS...
None.
&&

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

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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
220 PM PDT Fri Jul 25 2025

CAZ108-111-252145-
Northeastern Mendocino Interior CA-Southern Trinity CA-
220 PM PDT Fri Jul 25 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN MENDOCINO AND
SOUTH CENTRAL TRINITY COUNTIES UNTIL 245 PM PDT...

At 220 PM PDT, Doppler radar was tracking a strong thunderstorm 22
miles northeast of Covelo, moving southeast at 5 mph.

HAZARD...Wind gusts up to 40 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is possible.

Locations impacted include...
  Mainly rural areas of Northeastern Mendocino and South Central
  Trinity Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4001 12310 4010 12296 4009 12296 4008 12297
      4006 12295 4005 12295 4004 12295 4003 12295
      4002 12296 4001 12295 4000 12295 3999 12294
      3998 12294 3997 12293 3995 12293 3993 12291
      3993 12292 3992 12292 3991 12295 3988 12299
TIME...MOT...LOC 2119Z 320DEG 4KT 4003 12296

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

MH

Special Weather Statement
National Weather Service Eureka CA
249 PM PDT Fri Jul 25 2025

CAZ107-252215-
Northern Trinity CA-
249 PM PDT Fri Jul 25 2025

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

At 249 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Helena, or 17 miles northwest of Weaverville, and
is stationary.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is possible.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4107 12318 4091 12293 4079 12302 4075 12326
      4078 12330 4081 12337 4087 12340
TIME...MOT...LOC 2149Z 0DEG 0KT 4089 12322

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

DS