textproduct: San Diego

SYNOPSIS

Brief warming trend expected through Friday, with cooler conditions over the weekend, and additional warming next week. Gusty westerly winds over the mountains and into the deserts this weekend. Night and morning low clouds and fog will be present each day through the forecast period along the coast and into portions of the valleys at times.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

Brief warming trend for inland locations today and Friday. High resolution guidance is indicating a coastal eddy will be present Friday through Sunday which should push marine layer low clouds into the coastal basin each night morning this weekend. The eddy may also prevent low clouds from completely clearing the coast or push clearing to later in the afternoon. Patchy drizzle may develop, most likely on Saturday as a trough of low pressure passes to our north.

As the aforementioned trough digs south into the Pacific Northwest and Great Basin, winds will increase over the mountains and deserts. Gusty winds will develop late Saturday morning and continue into Sunday, weakening by late Sunday night. Winds will be strongest on the east facing mountain slopes, through passes, and into the deserts. Peak gusts will be mostly 40-60 mph, with local gusts to 65 mph possible in wind prone locations. Additionally temperatures will fall a few degrees, becoming slightly below normal for most locations.

Temperatures are expected to warm for early to mid-next week. Most ensemble clusters indicate a ridge of high pressure in the vicinity of the US West Coast by Monday with variations in placement. A more easterly position (putting the ridge over California) would lead to a warmer solution with a more westerly position (keeping the ridge over the Eastern Pacific) would keep temperatures more moderate.

AVIATION

150600Z...Coast/Valleys...Low clouds based around 1800-2000ft MSL have filled well inland across San Diego County, and will continue to spread northward into Orange County and the Inland Empire through 09-12z. VIS restrictions limited locally to inland valleys, and where clouds intersect terrain. Clouds scatter back to the coasts by 17-18z for San Diego County, closer to 19z for Orange County. Similar redevelopment of low clouds filling back in and pushing ashore after 00z Saturday, likely with similar bases to tonight.

Mountains/Deserts...Elevated westerly wind gusts 25-40 kt continuing through the deserts, but will gradually wane through 09-12z. MOD up/downdrafts and local LLWS in lee of mountains until then. Similar strength winds expected to pick back up again after 22z Friday. Otherwise, SKC and VFR expected through the period.

MARINE

No hazardous marine conditions are expected through Saturday morning. Winds are expected to reach 20-30 kts over outer coastal waters from late Saturday into early Sunday. Strongest gusts near San Clemente Island. This will generate hazardous conditions for small craft with choppy seas reaching 8-11 feet through Sunday morning.

SGX WATCHES/WARNINGS/ADVISORIES

CA...Wind Advisory from 11 AM Saturday to 11 PM PDT Sunday for Apple and Lucerne Valleys-San Bernardino County Mountains.

Wind Advisory from 2 PM Saturday to 11 PM PDT Sunday for Riverside County Mountains-San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning.

PZ...None.