Frost Advisory 17, NWS Eureka, CA

383 
WWUS76 KEKA 270421
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
921 PM PDT Sun Apr 26 2026

CAZ106-108-271600-
/O.CON.KEKA.FR.Y.0017.260427T0900Z-260427T1600Z/
Southeastern Interior Humboldt-Southern Trinity-
Including Dinsmore and Hayfork
921 PM PDT Sun Apr 26 2026

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT MONDAY...

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

* WHERE...Southeastern Interior Humboldt and Southern Trinity.

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

* 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

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1206 AM PDT Sun Apr 26 2026

.SYNOPSIS...Isolated showers and thunderstorms are possible in the
interior each afternoon through Monday. Drier weather returns mid
next week.

&&

.DISCUSSION...A deep marine layer will once again bring widespread
coastal stratus this morning. A shortwave moving through the area
may support some drizzle along the coastal areas this morning as
well. Most interior shower activity this morning will generally
remain east of the area, though a stray light rain shower in eastern
Trinity County. Dew points have dropped as drier air arrives behind
these showers and are in the low to mid 30s in Trinity County. Frost
may be possible in the coldest valleys of Trinity County with lows
possibly as low as the mid 30s. Confidence is low with cloud cover
from nearby showers along with potential low cloud cover.

Showers and isolated thunderstorms are possible again in the
afternoon and evening over Trinity, eastern Mendocino, and northern
Lake. Instability has waned somewhat over recent model runs, but
still a few lightning strikes are possible. High-res models show
areas of moderate to locally heavy rain rates over the higher
terrain in eastern Trinity, eastern Mendocino, and far northern Lake
Counties. HREF is showing around 50% chance for over a half inch of
rain in these areas. Showers will taper off in the evening and
overnight. Additional showers are possible again for the interior
areas Monday afternoon and evening. Instability currently looks
meager, so thunderstorms are less likely. Drier and warmer weather
is likely to return by mid next week as ridging redevelops. JB

&&

.AVIATION...A very deep although weak marine layer has blanketed the
coast (and even much of the interior) in MVFR ceilings around 2 kft
overnight. The marine layer is particularly robust for the southern
half of the area, covering nearly all of Mendocino County in 3kft
ceilings. Ceilings over the interior will quickly lift to VFR in the
morning, but will cling longer to the coast, with a 60% chance of
MVFR ceilings all day in Crescent City and around Humboldt Bay.
Regardless of clearing, stratus will again resurge along the coast
Sunday night. /JHW

&&

.MARINE...North winds in the outer water will continue to weaken
Sunday, leaving gentle winds in all water sand short period seas
falling below 6 feet by the afternoon. Meanwhile, a minor mid period
westerly sell will continue to build in up to 4 feet by Sunday
evening.

Gentle winds will generally continue Monday with the swell rapidly
decaying. Northerly winds will begin to return to southern waters
Monday night and spread into the northern waters by Tuesday. steep
short period seas will build in response at least in the outer
waters. Though strongest in the outer waters, short period wave
energy will begin to impact the inner waters mid week. Winds will
continue to increase late weak with a 75% chance of near gale
conditions by Thursday in the outer waters. /JHW

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 7 AM PDT this morning for PZZ470-
     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.

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