textproduct: Eureka

SYNOPSIS

High pressure ridging building in will trend temperatures warmer behind a departing area of low pressure. Deeply embedded stratus will limits sunshine closer to the coast in the near term. Hot inland temperatures are probable next week.

DISCUSSION

Afternoon satellite imagery showed a greatly deepened marine layer over a good portion of Del Norte, Humboldt and Mendocino counties. Other then some periods of afternoon clearing, this cloudier pattern will remain through Wednesday. There are indications the boundary layer will dry out more through late week.

Temperatures are trending higher with building high pressure, and the interior will be noticeably warmer starting Wednesday. A weakening and mostly dry front will pass through Friday, temporarily lowering inland temperatures by a few degrees and perhaps coaxing out some light coastal drizzle.

The ridge will quickly re-amplify through the weekend and into next week. There are high probabilities for inland temperatures to exceed 90 degrees as early as Sunday for the warmer interior valleys, with increasing chances Monday and Tuesday of next week. There are moderate to high chances (70%) for an exceedance of 95 degrees Monday and Tuesday for the interior valleys. Conditions as forecast would create areas of Moderate HeatRisk.

AVIATION

The stratus stronghold is beginning to break over the coastal areas with rapid clearing south of Cape Mendocino. Stratus is definitely persistent offshore and likely to fill back in tonight. GFS has the ceilings coming down to LIFR, below 500 feet tonight. With high pressure filling in and model soundings showing a significant inversion at KCEC and KACV, there is a possibility of overnight flight categories getting to LIFR. Cloud cover could keep some of the evaporative cooling from producing ground fog so possibly not as much in the way of low visibility, just low ceilings. Similar conditions for KUKI as well with southerly winds around 13-14z, which could advect stratus up the valley. /EYS

MARINE

Wind bearings have shifted from southerly to northwesterly with light winds around 5 to 15 kts. A northwest swell around 3-5 feet at 11-12 seconds will continue to decay. There is also a second wave group of around 3 feet at 8 seconds. The waves remain dominated by a 3 to 4 foot wave at 12 seconds and a 2 to 4 foot wave around 5 to 8 seconds. The winds are generally expected to remain around 5 to 15 kt out of the north through the work week. Late in the week a system moving by to the north may briefly switch the winds to the west or southwest. Over the weekend, high pressure returns and near gale to gale force northerly winds are expected to return. The waves are expected to remain fairly small, around 3 to 5 feet at 10 seconds. A new swell is expected to build to 4 to 6 feet at 14 seconds on Wednesday. MKK

EKA WATCHES/WARNINGS/ADVISORIES

CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... None.