Freeze Warning 5, NWS Eureka, CA

186 
WWUS76 KEKA 222040
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
140 PM PDT Wed Apr 22 2026

CAZ116-230445-
/O.EXB.KEKA.FZ.W.0005.260423T0900Z-260423T1600Z/
Northwestern and Central Trinity-
140 PM PDT Wed Apr 22 2026

...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM PDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Northwestern and Central Trinity.

* WHEN...From 2 AM to 9 AM PDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ108-111-114-117-230445-
/O.CON.KEKA.FZ.W.0005.260423T0900Z-260423T1500Z/
Southern Trinity-Northeastern Interior Mendocino-Northern Lake-
Northeastern Trinity-
Including Hayfork, Peanut, Gravelly Valley Airport, and Covelo
140 PM PDT Wed Apr 22 2026

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 30 expected.

* WHERE...Northern Lake, Northeastern Interior Mendocino,
  Northeastern Trinity, and Southern Trinity.

* WHEN...From 2 AM to 8 AM PDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ102>106-109-110-112-113-118>120-230445-
/O.CON.KEKA.FR.Y.0016.260423T0900Z-260423T1500Z/
Interior Del Norte-Northern Coastal Humboldt-Southwestern
Humboldt-Northeastern Interior Humboldt-Southeastern Interior
Humboldt-Coastal Mendocino-Northwestern Interior Mendocino-
Southwestern Interior Mendocino-Southeastern Interior Mendocino-
Western Lake-Southwestern Lake-Eastern Lake-
Including Bridgeville, Gasquet, Fieldbrook, Dinsmore, Legget,
Hopland, Whitethorn, Benbow, Laytonville, Calpella, Potter Valley,
Weitchpec, Willits, Boonville, Redwood Valley, Ettersburg,
Alderpoint, Philo, and Talmage
140 PM PDT Wed Apr 22 2026

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM PDT THURSDAY...

* WHAT...Temperatures as low as 35 will result in frost formation.

* WHERE...Portions of central and northwest California.

* WHEN...From 2 AM to 8 AM PDT Thursday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka

MKK

117 
WWUS76 KEKA 230603
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
1103 PM PDT Wed Apr 22 2026

CAZ108-111-114-117-231500-
/O.CON.KEKA.FZ.W.0005.260423T0900Z-260423T1500Z/
Southern Trinity-Northeastern Interior Mendocino-Northern Lake-
Northeastern Trinity-
Including Covelo, Peanut, Hayfork, and Gravelly Valley Airport
1103 PM PDT Wed Apr 22 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 30 expected.

* WHERE...Northern Lake, Northeastern Interior Mendocino,
  Northeastern Trinity, and Southern Trinity.

* WHEN...Until 8 AM PDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ116-231600-
/O.CON.KEKA.FZ.W.0005.260423T0900Z-260423T1600Z/
Northwestern and Central Trinity-
1103 PM PDT Wed Apr 22 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Northwestern and Central Trinity.

* WHEN...Until 9 AM PDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ102>106-109-110-112-113-118>120-231500-
/O.CON.KEKA.FR.Y.0016.260423T0900Z-260423T1500Z/
Interior Del Norte-Northern Coastal Humboldt-Southwestern
Humboldt-Northeastern Interior Humboldt-Southeastern Interior
Humboldt-Coastal Mendocino-Northwestern Interior Mendocino-
Southwestern Interior Mendocino-Southeastern Interior Mendocino-
Western Lake-Southwestern Lake-Eastern Lake-
Including Laytonville, Potter Valley, Alderpoint, Weitchpec, Redwood
Valley, Ettersburg, Hopland, Boonville, Benbow, Whitethorn, Dinsmore,
Philo, Willits, Bridgeville, Calpella, Fieldbrook, Gasquet, Talmage,
and Legget
1103 PM PDT Wed Apr 22 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PDT THURSDAY...

* WHAT...Temperatures as low as 34 will result in frost formation.

* WHERE...Portions of central and northwest California.

* WHEN...Until 8 AM PDT Thursday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

For hazard areas see https://www.wrh.noaa.gov/map/?wfo=eka

JB

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1226 AM PDT Wed Apr 22 2026

.SYNOPSIS...Showers will continue to taper off today. Dry weather is
expected Thursday and Friday with chilly temperatures likely. A few
rain showers and interior thunderstorms are possible this weekend
and into early next week.

&&

.DISCUSSION...The area of low pressure continues to move onshore,
and will continue to bring a few lingering showers through the
morning. Some breaks in the clouds will be possible by the
afternoon as drier air moves in and high pressure starts to build.
Lingering moisture from recent rains will likely bring fog in
many of the interior valleys tonight. Still, some of the coldest
areas, especially in interior Mendocino and Trinity, could see
temperatures drop into the low to mid 30s tonight and possibly
Thursday night. Frost Advisories may be needed should this trend
continue. Interior high temperatures will rebound into the 70s for
most interior valleys Thursday and Friday.

This weekend, an upper low approaches southern California while a
trough digs into the Pacific Northwest. Additional moisture and
cooler temperatures aloft could bring a few showers and isolated
thunderstorms to the interior. NBM is giving only a 10-15% chance
for over a half inch of rain for the interior areas, so little to no
impacts are expected. Wetting rain (>0.1") also looks unlikely with
only around a 20-30% chance across the area. JB

&&

.AVIATION...Showers have mostly exited the area Tuesday evening with
lingering instability keeping ceilings elevated, allowing for mostly
MVFR to VFR conditions. Further scattering is expected during the
day Wednesday alongside mostly VFR conditions all across the area.
There is a slight chance (30%) of some MVFR mist and ceilings along
the coast Wednesday night into Thursday, but otherwise conditions
will remain mostly favorable. /JHW

&&

.MARINE...Gentle winds have died down and shifted westerly in the
wake of a passing storm system. The current sea state is moderately
steep around 6 feet, mostly made of decaying short period seas and a
mid period westerly swell. SUch moderate conditions will persist or
even ease through the day Wednesday.

Northerly winds will begin to increase by Thursday, especially int
he southern waters with gusts over 25 kts in the lee of Cape
Mendocino. Short period seas will quickly build over 8 feet in
response to the winds. Stronger breezes will push close to shore
Thursday evening, at least briefly. Similar winds will most likely
continue into the end of the week but are more likely to remain only
in the outer waters. /JHW

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory from 2 PM Thursday to 2 AM PDT Friday
     for PZZ455.

     Small Craft Advisory from 8 AM Thursday to 5 AM PDT Friday
     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