Frost Advisory 12, NWS Eureka, CA

086 
WWUS76 KEKA 152155
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
255 PM PDT Wed Apr 15 2026

CAZ102-105>108-110-111-113>115-160600-
/O.CON.KEKA.FZ.W.0001.260416T0700Z-260416T1600Z/
Del Norte Interior-Northern Humboldt Interior-Southern Humboldt
Interior-Northern Trinity-Southern Trinity-Northwestern Mendocino
Interior-Northeastern Mendocino Interior-Southeastern Mendocino
Interior-Northern Lake-Southern Lake-
Including Del Loma, Bridgeville, Benbow, Alderpoint, Willits,
Hayfork, Gravelly Valley Airport, Big Bar, Carrville, Weaverville,
Weitchpec, Peanut, Zenia, Covelo, Willow Creek, Douglas City,
Junction City, Laytonville, Dinsmore, Potter Valley, Legget, Forest
Glen, Trinity Center, Helena, Finley, and Hyampom
255 PM PDT Wed Apr 15 2026

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
THURSDAY...

* WHAT...Sub-freezing temperatures as low as 28 expected.

* WHERE...Trinity County, Lake County, Humboldt Interior, Northern
  Mendocino Interior, Del Norte Interior, and Southeastern Mendocino
  Interior.

* WHEN...From midnight tonight 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.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

&&

$$

CAZ112-160600-
/O.EXA.KEKA.FR.Y.0012.260416T0700Z-260416T1600Z/
Southwestern Mendocino Interior-
Including Yorkville, Boonville, Comptche, and Philo
255 PM PDT Wed Apr 15 2026

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
THURSDAY...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Southwestern Mendocino Interior.

* WHEN...From midnight tonight to 9 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.

&&

$$

CAZ101-103-104-109-160600-
/O.CON.KEKA.FR.Y.0012.260416T0700Z-260416T1600Z/
Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt-
Mendocino Coast-
Including Ettersburg, Klamath, Smith River, Ft Dick, McKinleyville,
Briceland, Honeydew, Trinidad, Whitethorn, Arcata, and Fieldbrook
255 PM PDT Wed Apr 15 2026

...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
THURSDAY...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Del Norte, Humboldt, and Mendocino Coast.

* WHEN...From midnight tonight to 9 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

JLW

148 
WWUS76 KEKA 160455
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
955 PM PDT Wed Apr 15 2026

CAZ102-105>108-110-111-113>115-161300-
/O.CON.KEKA.FZ.W.0001.260416T0700Z-260416T1600Z/
Del Norte Interior-Northern Humboldt Interior-Southern Humboldt
Interior-Northern Trinity-Southern Trinity-Northwestern Mendocino
Interior-Northeastern Mendocino Interior-Southeastern Mendocino
Interior-Northern Lake-Southern Lake-
Including Dinsmore, Benbow, Willow Creek, Potter Valley, Forest Glen,
Bridgeville, Finley, Laytonville, Helena, Legget, Zenia, Junction
City, Hyampom, Big Bar, Hayfork, Weitchpec, Covelo, Carrville,
Gravelly Valley Airport, Alderpoint, Peanut, Douglas City, Del Loma,
Trinity Center, Weaverville, and Willits
955 PM PDT Wed Apr 15 2026

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

* WHAT...Sub-freezing temperatures as low as 26 expected.

* WHERE...Trinity County, Lake County, Humboldt Interior, Northern
  Mendocino Interior, Del Norte Interior, and Southeastern Mendocino
  Interior.

* 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.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

&&

$$

CAZ101-103-104-109-161300-
/O.CON.KEKA.FR.Y.0012.260416T0700Z-260416T1600Z/
Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt-
Mendocino Coast-
Including Ft Dick, Trinidad, Smith River, Ettersburg, Briceland,
Whitethorn, McKinleyville, Fieldbrook, Klamath, Arcata, and Honeydew
955 PM PDT Wed Apr 15 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THURSDAY...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Del Norte, Humboldt, and Mendocino Coast.

* WHEN...Until 9 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.

&&

$$

CAZ112-161300-
/O.CON.KEKA.FR.Y.0012.260416T0700Z-260416T1600Z/
Southwestern Mendocino Interior-
Including Yorkville, Philo, Boonville, and Comptche
955 PM PDT Wed Apr 15 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THURSDAY...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Southwestern Mendocino Interior.

* WHEN...Until 9 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

DS

876 
WWUS76 KEKA 161008
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
308 AM PDT Thu Apr 16 2026

CAZ102-105>108-110-111-114-115-161600-
/O.NEW.KEKA.FZ.W.0002.260417T0700Z-260417T1600Z/
/O.CON.KEKA.FZ.W.0001.000000T0000Z-260416T1600Z/
Del Norte Interior-Northern Humboldt Interior-Southern Humboldt
Interior-Northern Trinity-Southern Trinity-Northwestern Mendocino
Interior-Northeastern Mendocino Interior-Northern Lake-Southern
Lake-
Including Gravelly Valley Airport, Legget, Helena, Junction City,
Willits, Potter Valley, Weitchpec, Pepperwood, Laytonville, Peanut,
Benbow, Bridgeville, Forest Glen, Alderpoint, Carrville, Finley,
Hyampom, Zenia, Douglas City, Willow Creek, Orleans, Big Bar, Del
Loma, Shively, Weaverville, Hayfork, Gasquet, Dinsmore, Covelo, and
Trinity Center
308 AM PDT Thu Apr 16 2026

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
FRIDAY...
...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 26 expected.

* WHERE...Trinity County, Lake County, Humboldt Interior, Northern
  Mendocino Interior, and Del Norte Interior.

* WHEN...For the first Freeze Warning, until 9 AM PDT this morning.
  For the second Freeze Warning, from midnight tonight to 9 AM PDT
  Friday.

* 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.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

&&

$$

CAZ113-161600-
/O.CON.KEKA.FZ.W.0001.000000T0000Z-260416T1600Z/
Southeastern Mendocino Interior-
308 AM PDT Thu Apr 16 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 26 expected.

* WHERE...Southeastern Mendocino Interior.

* WHEN...Until 9 AM PDT this morning.

* 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.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

&&

$$

CAZ101-103-104-109-161600-
/O.NEW.KEKA.FR.Y.0013.260417T0700Z-260417T1600Z/
/O.CON.KEKA.FR.Y.0012.000000T0000Z-260416T1600Z/
Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt-
Mendocino Coast-
Including Trinidad, Honeydew, Ettersburg, Klamath, McKinleyville,
Fernbridge, Briceland, Smith River, Arcata, Fieldbrook, Whitethorn,
Samoa, Ft Dick, and Eureka
308 AM PDT Thu Apr 16 2026

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
FRIDAY...
...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Del Norte, Humboldt, and Mendocino Coast.

* WHEN...For the first Frost Advisory, until 9 AM PDT this morning.
  For the second Frost Advisory, from midnight tonight to 9 AM PDT
  Friday.

* 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.

&&

$$

CAZ112-161600-
/O.NEW.KEKA.FR.Y.0013.260417T0700Z-260417T1600Z/
/O.CON.KEKA.FR.Y.0012.000000T0000Z-260416T1600Z/
Southwestern Mendocino Interior-
Including Boonville, Yorkville, Comptche, and Philo
308 AM PDT Thu Apr 16 2026

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
FRIDAY...
...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Southwestern Mendocino Interior.

* WHEN...For the first Frost Advisory, until 9 AM PDT this morning.
  For the second Frost Advisory, from midnight tonight to 9 AM PDT
  Friday.

* 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

EYS

705 
WWUS76 KEKA 161538
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
Issued by National Weather Service Medford OR
838 AM PDT Thu Apr 16 2026

CAZ102-105>108-110-111-114-115-162345-
/O.EXP.KEKA.FZ.W.0001.000000T0000Z-260416T1600Z/
/O.CON.KEKA.FZ.W.0002.260417T0700Z-260417T1600Z/
Del Norte Interior-Northern Humboldt Interior-Southern Humboldt
Interior-Northern Trinity-Southern Trinity-Northwestern Mendocino
Interior-Northeastern Mendocino Interior-Northern Lake-Southern
Lake-
Including Forest Glen, Gravelly Valley Airport, Hyampom, Finley,
Orleans, Pepperwood, Willits, Legget, Willow Creek, Weaverville,
Hayfork, Zenia, Junction City, Weitchpec, Douglas City, Trinity
Center, Covelo, Gasquet, Del Loma, Laytonville, Alderpoint, Big
Bar, Peanut, Shively, Dinsmore, Helena, Benbow, Carrville, Potter
Valley, and Bridgeville
838 AM PDT Thu Apr 16 2026

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM 
PDT FRIDAY...
...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 26 expected.

* WHERE...Trinity County, Lake County, Humboldt Interior, Northern 
  Mendocino Interior, and Del Norte Interior.

* WHEN...From midnight tonight to 9 AM PDT Friday.

* 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.

&&

$$

CAZ113-161645-
/O.EXP.KEKA.FZ.W.0001.000000T0000Z-260416T1600Z/
Southeastern Mendocino Interior-
838 AM PDT Thu Apr 16 2026

...FREEZE WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING...

$$

CAZ101-103-104-109-112-162345-
/O.EXP.KEKA.FR.Y.0012.000000T0000Z-260416T1600Z/
/O.CON.KEKA.FR.Y.0013.260417T0700Z-260417T1600Z/
Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt-
Mendocino Coast-Southwestern Mendocino Interior-
Including Honeydew, Ettersburg, Samoa, McKinleyville, Briceland,
Philo, Arcata, Smith River, Comptche, Whitethorn, Eureka,
Fernbridge, Boonville, Yorkville, Fieldbrook, Ft Dick, Klamath,
and Trinidad
838 AM PDT Thu Apr 16 2026

...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM 
PDT FRIDAY...
...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING...

* WHAT...Temperatures 33 will result in frost formation.

* WHERE...Del Norte, Humboldt, and Mendocino Coast, and Southwestern 
  Mendocino Interior.

* WHEN...From midnight tonight to 9 AM PDT Friday.

* 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

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1205 AM PDT Wed Apr 15 2026

.SYNOPSIS...Rain through Wednesday, especially for the North Coast.
Near freezing to freezing low temperatures expected to return late
week. More rain possible late weekend.

&&

.DISCUSSION...Rain is making its way southward along the Pacific
Coast. A rainy morning is expected for the North Coast with a
period of moderate rainfall around midday as a frontal boundary
passes overhead. Rain totals are expected to be around 1.00" for
Del Norte Co. and slightly less for Humboldt Co. Lighter
precipitation is forecasted for Trinity and Northern Mendocino Co.
Trace amounts of rain (<0.10") expected for Lake and southern
Mendocino Co. Strong southerly winds will develop along the North
Coast before this frontal boundary passing. After this frontal
boundary in Lake Co., while there might not be much in terms of
rainfall, strong winds are forecasted to develop, especially for
the higher terrain.

This cold front will advect much colder air over the region. Snow
levels drop in response down to ~1,500ft for Trinity Co. and ~2,00ft
for Humboldt Co. This drop is not expected to create much snow as
much of the precipitation will be over by this time. What this colder
air will do is increase the likelihood for frost/freeze conditions
for the entire area on Thursday and Friday. NBM data shows the
interior valleys are forecasted to get colder than 30F Thursday and
Friday mornings. As growing season begins, it is recommended to cover
sensitive plants and take other precautions to protect agricultural
property these mornings.

The GFS and ECMWF are both signaling for another frontal storm arriving
this weekend. The GFS ensemble shows light rain Sunday with heavier
rain possible on Monday. The EPS shows almost the same, with rainbeginning
on Saturday evening. What these models also show is more widespread
rainfall over the area with precipitation accumulations up to0.50"
in Lake and southern Mendocino counties. DS

&&

.AVIATION...A cold front will swoop across the area on Wednesday
bringing MVFR and occasional IFR cigs and vsby's in light to
moderate rain. Initially southerly and southeasterly winds in
advance of the front will maintain mostly MVFR conditions.
Conditions will initially deteriorate at KCEC with reduced vsby in
rain and S-SW gusts to around 30 kt. IFR conditions will then spread
southward to KACV by 16Z with about a 30% chance of vsby from 1 to
2SM and IFR cigs in light to moderate rain. A push of moist and
gusty NW winds behind the front will keep the threat for IFR
conditions and light rain going into the afternoon hours. For UKI,
generally VFR is expected with bountiful cloud cover and gusty
afternoon and evening N-NW winds. Surface wind decouples late in the
evening on Wed and potential for low level wind shear will increase
as robust N-NE wind flow develops 1000-2500 AGL.

&&

.MARINE...A vigorous cold frontal boundary will move across the
coastal waters on Wed. Southerly and southwest winds with gusts to
25-30 kt will develop early in the morning and then rapidly shift
around to N and NW behind the front in the late morning and early
afternoon across the northern waters. Widespread seas building to 6
feet or higher are limited on Wed. There are indications from the
NWPS model of localized pockets of steep waves from 6 to 8 feet
mostly north of Trinidad by early afternoon for the inner and outer
waters. Therefore an advisory has been issued even with limited
areal coverage of steep wave over 6 ft. An advisory based on wind
gusts from 25 to 30 kt appears more solid, but errors in the wind
gust forecast could be as much 10 kt. Just about all the mesoscale
models have gusts over 21 kt over a sufficiently large enough area
to warrant an advisory for small craft. Northerly winds strengthen
and steep wave build Wed evening and overnight, especially south of
Cape Mendo. Thus, an advisory has been posted for the inner waters
south of Cape Mendo. Gale force winds will be possible (30% chance)
as early as Wed evening. Greater coverage and longer duration of
gale gusts holds off til Thu afternoon and evening - per the HREF.
Thus a gale watch has been hoisted for the southern waters. Seas
will build to max heights Thu afternoon thru Thu night. Steep waves
are projected to reach 11-13 feet for the southern waters and 9-11
feet in the northern waters. Seas may remain steep and elevated on
Fri, however a downward trend will commence and continue into Sat.
Another front will approach over the weekend and could bring another
bout of gusty winds.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory from 7 AM this morning to 5 AM PDT
     Friday for PZZ450.

     Small Craft Advisory from 7 PM this evening to 2 PM PDT
     Thursday for PZZ455.

     Gale Watch from Thursday afternoon through late Thursday
     night for PZZ455.

     Small Craft Advisory from 5 AM early this morning to 5 AM
     PDT Friday for PZZ470.

     Small Craft Advisory from 3 PM this afternoon to 5 AM PDT
     Thursday for PZZ475.

     Gale Watch from late tonight through late Thursday night
     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