textproduct: San Diego

SYNOPSIS

Through Sunday, stronger onshore flow and a weak coastal eddy will bring gradual deepening of the marine layer with cooling spreading inland. Night and morning coastal low clouds and fog will increase in coverage and spreading a little farther inland each night through the weekend. Weak northerly flow on Monday will bring warming for the coast and valleys and cooling inland. A low pressure system moving southward along the West Coast will bring cooling for Wednesday and Thursday. If the track is far enough to the west, there would also be a chance of showers.

SHORT TERM (Today through Sunday)

A weak coastal eddy has developed with local higher-resolution model guidance showing the eddy continuing into Sunday morning with slow deepening of the marine layer along with increasing coverage of night and morning coastal low clouds and fog.

The lower level flow is still weakly offshore, though trending weakly onshore. Satellite imagery shows low clouds and fog over the coastal waters remaining off the coast of San Diego and southern Orange Counties and drifting farther off the coast with the low clouds and fog extending locally inland into northern Orange County and southern Los Angeles Counties. The fog is locally dense with visibility of one-quarter mile or less at Long Beach and Los Alamitos.

As onshore flow returns and the marine layer slowly deepens, cooling will spread inland through the weekend. High temperatures today for the coast and valleys will be as much as 4 to 8 degrees cooler than Thanksgiving with the greater cooling on Saturday for the mountains and high desert. The cooling will continue for the coast and valleys on Sunday as the marine layer deepens. High temperatures on Sunday will be a few degrees below average for coastal areas with the mountains and deserts as much as 4 to 8 degrees above average. High temperatures on Sunday will range from the lower to mid 60s near the coast to around 70 for the valleys with the 70s for the lower deserts.

LONG TERM (Monday through Thursday)

For Monday, northerly low level flow will bring cooling of 4 to 8 degrees for the mountains and high desert and warming of a few degrees for the coast and valleys. The coast and valleys will cool a few degrees on Tuesday and the mountains and high deserts will warm a few degrees as the lower-level northerly flow weakens.

For Wednesday and Thursday, a low pressure system moving southward in the vicinity of the West Coast will bring cooling. Depending on the track and evolution of this system, it could also bring a chance of precipitation.

Mountains/Deserts

VFR conditions expected through the TAF period.

MARINE

No hazardous marine conditions are expected through Wednesday.

SGX WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...None.