textproduct: San Diego

SYNOPSIS

A trough of low pressure will deepen offshore through the middle of the week, bringing cooler weather, breezier conditions, and greater coverage of low clouds west of the mountains. High pressure will reemerge at the end of the week, bringing in warmer conditions and cloud coverage closer to the coast.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

High clouds from the south intersect low clouds along the coast this afternoon as a weak area of low pressure moves over the region. Patchy low clouds will be found at the coast before greater cloud coverage moves into the valleys this evening, where there is low to moderate confidence in clouds moving into the Inland Empire. Foggy conditions are still expected overnight into Monday morning for valley areas. A Pacific storm over the Aleutian Island Chain of Alaska will move closer to the West Coast over the next couple days. This will lead to pressure height falls, aiding in minor cooling and greater onshore flow across Southern California in the coming days. High temperatures will be similar most places by Monday and Tuesday, with the inland valleys seeing the greatest cooling around 5 degrees with widespread highs in the lower 80s. The marine layer will slowly deepen over the next couple of days as well, with a greater chance of fog for areas of the Inland Empire.

The Pacific storm and associated area of low pressure will move into Northern California and Oregon by Wednesday and Thursday. This will bring the greatest cooling and west winds over the region. Highs in the 60s/70s will be common for most areas with the Coachella Valley in the 80s. We still continue to monitor winds during this time, but confidence is increasing on wind speeds becoming elevated across the mountains and deserts with gusts 20-40 MPH out of the west. Model agreement is fairly uniform in bringing in an expanding area of high pressure by Friday into next weekend across the region, which will contribute to warmer weather and weaker winds with offshore flow.

AVIATION

022100Z...Coasts/Valleys...SCT-BKN low clouds based around 900ft MSL hanging right along the coast, intermittently impacting some coastal sites, continuing through 00z Mon. More uniform low clouds begin to move inland after 00z with bases ranging 700-1100ft MSL. Most coastal sites will be high-end IFR for the first few hours, with VIS ranging from 4-6SM. VIS will gradually fall a bit overnight as will bases, closer to 500-900ft MSL. VIS for coastal terrain and valleys will fall to 1/2SM or less at times, generally after 07z. 30-40% chance of a CIG at KONT, generally after 08z. Clouds should clear back towards the coast at a similar time as today, around 17z Mon, and linger at the coast/beaches through much of the day.

Mountains/Deserts...VFR conditions prevail through the period. FEW- SCT high clouds AOA 20,000ft MSL through Monday.

MARINE

No hazardous marine concerns through Thursday.

BEACHES

Long period (19-21 sec) swell from the southwest (200 degrees) prevailing through today, bringing elevated surf of 3 to 5 feet with locally higher sets on southwest facing beaches. Surf will gradually fall tonight into Monday. Surf becomes elevated again late week.

SKYWARN

Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

SGX WATCHES/WARNINGS/ADVISORIES

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