textproduct: Eureka

KEY MESSAGES

* Unseasonably hot temperatures with near record highs continue to generate Moderate HeatRisk across the interior through mid week.

* Shallow, diurnal marine layer persisting along the coast through the weekend.

* Dry conditions expected through this coming work week.

SYNOPSIS

An upper level ridge over the four corners continues to influence our area this week and will create unseasonably hot and dry conditions for the interior. The anticyclonic flow has pushed moisture plumes into the coastal areas today which has eased some of the forecasted heating but continues to drive overcast skies along the North Coast.

DISCUSSION

A consistent synoptic pattern remains overhead forcing relatively similar conditions for the past few days, expected to persist into the work week. Interior areas remain very hot, with close to record breaking temperatures and dry. Thermal belts remain at midslope keeping areas above warm overnight. Light terrain-driven winds are expected due to a stable atmosphere and minimal forcing. Coastal areas of Del Norte and N. Humboldt can expect continued overcast conditions with areas of dense fog and light drizzle. The Mendocino coast has also experienced steady overcast conditions due to the high pressure centered over the four corners, anticyclonic flow aloft pulling some of the extra tropical moisture over the western most areas.

This pattern is expected to continue into most of the coming week as the upper level ridge stays firmly in place. The only sign of relief seems to be next weekend. The GFS and ECMWF ensembles show an upper level trough dipping into the area sometime late Saturday into Monday morning. There is a even a chance of rain returning to the area during this time, yet any details are not clear at this moment. While it is important to remember this is the far extended forecast, the possibility remains. DS/EYS

AVIATION

LIFR conditions will return for KACV and KCEC this evening after a few hours of VFR at KCEC and an even longer/improved morning through afternoon for KACV. A fog bank with variable visibilities continues to ebb and flow over the terminals. Periods of 1/4SM FG will oscillate with visibilities up to 2SM through the evening before dense fog sets in around 04-06Z. Winds will remain light (<5kt) both along the coast and inland. Coastal winds will remain northerly at KCEC and westerly at KACV for a few more hours before calming and becoming variable at times overnight.

MARINE

Winds out of the north build again this evening and bring small craft advisory conditions with them. Wind waves will steepen, bringing groups of 6-9 feet at 6-9 seconds. Initially the southern outer water zone PZZ475, will carry the small craft advisory before the majority of the northern outer waters in zone PZZ470, also joins the small craft advisory later tonight. Otherwise, a mid period southerly swell persists but with minimal effect.

EKA WATCHES/WARNINGS/ADVISORIES

CA... Heat Advisory until 11 PM PDT Monday for CAZ112-113-118>120.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 9 PM PDT Monday for PZZ470.

Small Craft Advisory until 9 PM PDT Monday for PZZ475.