textproduct: San Diego

SYNOPSIS

Brief warming trend expected through Friday, with cooler conditions over the weekend, and potential for additional warming early next week. 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.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

Visible satellite at 11 AM was showing low clouds clearing from the valleys to the coast. Low clouds may linger along the immediate coast into the late afternoon. The marine layer will gradually become shallower for Thursday and Friday, with overnight low clouds not reaching as far inland. Low clouds should clear most locations by late morning, with the coast having the highest potential for low clouds lingering into the afternoon. The marine layer will become deeper for Friday into the weekend as a broad trough of low pressure digs into the Pacific Northwest.

High temperatures will warm a few degrees each day through Friday, most noticeable to for the deserts. Highs in the deserts will be 5 to 10 degrees above average, with highs west of the mountains within 5 degrees of average. As the aforementioned low digs south, winds will increase over the mountains and deserts. Winds will peak in strength Saturday into Sunday with the trough passage. 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 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

140000Z...Coast/Valleys...Low clouds have cleared out offshore this afternoon. Isolated patches of clouds may begin to develop over the city of San Diego after 01z, with more confidence that more widespread cigs develop over SD County after 03z, with almost full cig coverage to the foothills by 08z. These clouds based 1500-2500 ft MSL will expand northward into Orange County after 07z and slowly fill into the Inland Empire in patchy fashion. By 13z, 50% chance for cigs over KONT and 60% over KSBD. Patchy VIS reductions (HZ/BR) 3-5SM in the Inland Empire; 0-3SM along the foothills. Scatter out inland begins 15z. Full scatter out to coast by around 18z.

Mountains/Deserts...Westerly wind gusts 25-40 kt along desert slopes and into deserts this evening. Gusts locally to 50 kts through the Banning Pass. MOD up/downdrafts and local LLWS in lee of mountains.

MARINE

No hazardous marine conditions are expected through Saturday morning. Increasing winds and seas over the outer coastal waters could become hazardous for small craft Saturday afternoon through Sunday.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

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