textproduct: Eureka

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.