FXUS66 KEKA 040702

AFDEKA



AREA FORECAST DISCUSSION

National Weather Service Eureka CA

1202 AM PDT Mon May 4 2026



.SYNOPSIS...Showers move south and taper off today into Tuesday. A 

few thunderstorms are possible in Trinity County this afternoon and 

evening. Warmer and drier conditions build midweek.





&&



.DISCUSSION...Thunderstorm activity has waned into the early morning 

hours. Lingering showers will generally shift southward today with 

rain likely only in Mendocino & Lake Counties by the afternoon. 

Cloud cover and lingering moisture will keep interior temperatures 

cooler, with most valleys in the 60s. There is around a 15-20% 

chance for thunderstorms this afternoon and evening in the Trinity 

Horn, and low chances (10-15%) to the south in interior Mendocino 

and northern Lake Counties. Confidence is low as cloud cover and 

cooler temperatures may keep thunderstorms from forming.



Drier conditions will quickly return by Tuesday. That said, there is 

a very slight (10%) chance of some weak lingering thunderstorms over 

the interior on Tuesday. Benign and weak high pressure will build 

late in the week, bringing slightly warmer than average temperatures 

but otherwise dry, seasonable, and calm weather. There is chance for 

the marine layer to finally clear out around Wednesday before 

rebounding later in the week as a marine inversion reforms under the 

interior heat. /JHW/JB





&&



.AVIATION...IFR to MVFR ceilings are likely across the 

terminals through sunrise as the deep marine layer remains steady. 

Thunderstorm activity will also ease, but lingering showers will 

continue through the day and move southward. By the afternoon, 

showers will only be likely Mendocino & Lake. MVFR ceilings are 

likely to remain through the day as coastal stratus persists and 

showers continue at UKI. A brief rise into VFR is possible late 

afternoon. JB





&&



.MARINE...A long period northwest swell has filled in on Sunday, 

peaking at around 8 ft at 15 seconds. Winds have generally turned 

light and southerly across the area. A few areas of brief gusty 

winds, up to 20 kts, are possible north of Cape Mendocino early this 

morning as stronger showers move over the waters. These will subside 

by sunrise. Seas will generally ease over the coming days as winds 

remain light. Winds turn northerly Tuesday and Wednesday, but remain 

fairly light at around 5 to 15 kts, with the highest winds south of 

Cape Mendocino. Combined seas remain mild at around 4 to 7 ft, with 

a mix of short period waves of around 3 ft and mid and long period 

NW swells of up to 5 ft. JB





&&



.EKA WATCHES/WARNINGS/ADVISORIES...

CA...

None.

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.



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For forecast zone information

see the forecast zone map online:

https://www.weather.gov/images/eka/zonemap.png