Special Weather Statement, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
430 AM PDT Mon Mar 31 2025

.SYNOPSIS...General gusty winds, showers and isolated
thunderstorms with potential small hail are expected to continue
through Tuesday along with moderate to heavy downpours today and
Tuesday. Heavy mountain snow above 3000 feet elevation is
anticipated through Tuesday, as well. Lingering showers through
Wednesday, followed by dry weather for the remainder of the week
are forecast.

&&

.DISCUSSION...

KEY MESSAGES:

-Continued showers and gusty winds (gusts 25mph to 40mph), with
 isolated thunderstorms capable of producing small hail around the
 coast.

-Periods of moderate to heavy downpours today into early Tuesday.

-Heavy mountain snow above 3000 feet for Trinity and Humboldt
 counties into mid day Tuesday.

WEATHER PATTERN OVERVIEW:

An area of low pressure continues its approach toward the Pacific
Northwest. Showers continue to move through the area early this
morning. By mid to late morning, another push of moisture will
move into Northwest California. Periods of moderate to heavy
rainfall and the chance for isolated thunderstorms with some
potential for small hail for coastal areas are expected as cooler
air infiltrates the region. This colder deep-layer airmass will
subsequently spread south across the West Coast through Tuesday.
The cold airmass will aid in steep lapse rates and an increasingly
unstable environment. Isolated thunderstorms, small hail and
brief heavy downpours will be possible with the strongest showers.
In addition, gusty southwest winds from 25 to 40 mph are expected
across the area late this afternoon through Tuesday afternoon.

Mountain snow impacts are likely over Trinity County and northern
interior Humboldt today through Tuesday afternoon. Snow levels
will likely drop to 3000 feet today. Heavy snow, with storm total
accumulations at 7 to 12 inches for elevations above 3000 feet,
with locally higher amounts to 1.5 feet across the higher ridges,
are probable this morning through Tuesday afternoon. Snow levels
will be generally above 3000 feet. However, uncertainty exist with
snow levels due to the possibility of lower snow levels during
convective showers. 2 to 3 inches of snow are expected for
elevations as low as 2600 feet. Travel impacts are expected across
much of highway 3 north of Weaverville and Hayfork Summit, Hwy
junction 36 and 3 at South Fork Mountain, Hwy 299 at Berry Summit,
Buckhorn Summit and Oregon Mountain.

Lingering showers are expected through Wednesday, followed by dry
weather for the remainder of the week as a large scale upper level
ridge gradually builds across the region in the wake of the
trough.

FORECAST CONFIDENCE AND DEVIATIONS:

Rain today could be heightened due to increased potential for
convection, possibly creating increased rain rates and a small
hail threat. By very early Wednesday morning, cold air aloft could
allow for lower snow levels across NW California. Models
currently show a strong diurnal pattern with snow levels dipping
to around 2500 feet at night (NBM) and jumping above 3000 feet
during the day. Any snow that falls at lower elevations will be
very inconsistent and likely not very impactful.

&&

.AVIATION...Coastal terminals are predominantly VFR/MVFR with periodic
reductions in viz/ceilings with convective rain showers and gusty
SSW winds. A slightly quieter period is expected through sunrise
before more widespread showers and isolated thunderstorms develop
from offshore and continue through the day. Similar fluctuating
conditions are expected at all terminals with gusty SW winds,
especially at CEC. A broad upper trough will drive the surface low
closer to the OR/WA coast late this afternoon and evening, with a
period of LLWS and gusts exceeding 30 KTS possible along the north
coast after 00Z.

&&

.MARINE...Small craft winds and seas continue across all zones as a
surface low spins off the OR/WA coast. Scattered showers and
isolated thunderstorms are expected through Tuesday, occasionally
producing gusty and erratic winds and locally heavy downpours. As
the low nears the coast, near gale to gale gusts are expected in the
outer waters overnight into early Tuesday. A Gale Watch has been
extended to the southern outer waters due to uncertainty on the
coverage of these winds. A large mid-period westerly swell will fill
into the waters during the same time period, peaking early Tuesday
morning. Significant wave heights 15 to 17 feet are possible before
quickly diminishing below advisory levels by Wednesday.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Winter Weather Advisory from 5 PM this afternoon to 5 PM
     PDT Tuesday for CAZ105.

     Winter Storm Warning until 5 PM PDT Tuesday for CAZ107-108.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 3 AM PDT Wednesday for PZZ450-
     455.

     Small Craft Advisory until 9 PM PDT this evening for PZZ470-
     475.

     Gale Watch from this evening through Tuesday morning for
     PZZ470-475.

&&

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

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Special Weather Statement
National Weather Service Eureka CA
1257 PM PDT Mon Mar 31 2025

CAZ101-102-312030-
Del Norte Interior CA-Coastal Del Norte CA-
1257 PM PDT Mon Mar 31 2025

...A THUNDERSTORM WILL IMPACT NORTHWESTERN DEL NORTE COUNTY THROUGH
130 PM PDT...

At 1256 PM PDT, Doppler radar was tracking a strong thunderstorm over
Crescent City North, or over Jack McNamera Field, moving northeast at
45 mph.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Hazardous conditions to motorists Exercise caution when
         driving over small hail.

Locations impacted include...
Jedediah Smith State Park, Smith River, Gasquet, Fort Dick, Crescent
City, Bertsch-Oceanview, Crescent City North, and Jack McNamera
Field.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Small hail can quickly accumulate on roadways resulting in slippery
conditions. Go easy on brakes and steering to avoid spin-outs.

&&

LAT...LON 4200 12382 4199 12370 4170 12414 4172 12415
      4174 12417 4175 12419 4174 12420 4177 12425
      4179 12425 4181 12424 4189 12421 4194 12420
      4195 12421 4199 12420 4200 12421
TIME...MOT...LOC 1956Z 222DEG 37KT 4174 12422

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

JJW

Preliminary Local Storm Report
National Weather Service Eureka CA
111 PM PDT Mon Mar 31 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0111 PM     Hail             1 WNW Crescent City     41.76N 124.22W
03/31/2025  E0.25 Inch       Del Norte          CA   Trained Spotter

&&

Special Weather Statement
National Weather Service Eureka CA
111 PM PDT Mon Mar 31 2025

CAZ103-104-106-312045-
Southwestern Humboldt CA-Northern Humboldt Coast CA-
Southern Humboldt Interior CA-
111 PM PDT Mon Mar 31 2025

...GUSTY SHOWERS WILL IMPACT SOUTHWESTERN HUMBOLDT COUNTY THROUGH 145
PM PDT...

At 109 PM PDT, Doppler radar was tracking gusty showers over Fortuna,
or 12 miles northwest of Grizzly Creek Redwoods State Park, moving
northeast at 35 mph.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Hazardous conditions to motorists Exercise caution when
         driving over small hail.

Locations impacted include...
Rio Dell, Carlotta, Scotia, Fortuna, Pepperwood, Rohnerville,
Petrolia, Hydesville, Capetown, and Shively.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Small hail can quickly accumulate on roadways resulting in slippery
conditions. Go easy on brakes and steering to avoid spin-outs.

&&

LAT...LON 4047 12439 4063 12414 4045 12390 4024 12433
      4024 12435 4029 12436 4031 12435 4033 12435
      4035 12436 4038 12436 4042 12440 4044 12441
TIME...MOT...LOC 2009Z 240DEG 36KT 4059 12410

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

JJW

Special Weather Statement
National Weather Service Eureka CA
128 PM PDT Mon Mar 31 2025

CAZ104-106-109-110-312100-
Southwestern Humboldt CA-Southern Humboldt Interior CA-
Mendocino Coast CA-Northwestern Mendocino Interior CA-
128 PM PDT Mon Mar 31 2025

...A STRONG SHOWERS AND THUNDERSTORM WILL IMPACT NORTHWESTERN
MENDOCINO AND SOUTHWESTERN HUMBOLDT COUNTIES THROUGH 200 PM PDT...

At 126 PM PDT, Doppler radar was tracking a strong thunderstorm over
Whitehorn, or near Shelter Cove, moving east at 35 mph.

HAZARD...Winds in excess of 30 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. Hazardous conditions to motorists Exercise
         caution when driving over small hail.

Locations impacted include...
Whitehorn, Leggett, Shelter Cove, Richardson Grove State Park,
Piercy, Briceland, Honeydew, and Ettersburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Small hail can quickly accumulate on roadways resulting in slippery
conditions. Go easy on brakes and steering to avoid spin-outs.

&&

LAT...LON 4033 12414 3988 12364 3976 12383 3983 12385
      3986 12391 3991 12393 4001 12403 4003 12408
      4007 12408 4010 12411 4013 12419 4016 12422
      4025 12435
TIME...MOT...LOC 2026Z 267DEG 32KT 4004 12397

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

JJW

Special Weather Statement
National Weather Service Eureka CA
203 PM PDT Mon Mar 31 2025

CAZ109-110-312130-
Mendocino Coast CA-Northwestern Mendocino Interior CA-
203 PM PDT Mon Mar 31 2025

...GUSTY SHOWERS WILL IMPACT NORTHWESTERN MENDOCINO COUNTY THROUGH
230 PM PDT...

At 202 PM PDT, Doppler radar was tracking gusty showers 7 miles west
of Leggett, or 11 miles south of Richardson Grove State Park, moving
east at 25 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Hazardous conditions to motorists Exercise caution when
         driving over small hail.

Locations impacted include...
Leggett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Small hail can quickly accumulate on roadways resulting in slippery
conditions. Go easy on brakes and steering to avoid spin-outs.

&&

LAT...LON 3999 12375 3981 12363 3976 12384 3979 12384
      3981 12385 3983 12385 3985 12388 3986 12391
      3990 12393
TIME...MOT...LOC 2102Z 266DEG 22KT 3986 12387

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

JJW