textproduct: San Diego

SYNOPSIS

Area temperatures will be up to 10 degrees below average through Thursday as an area of low pressure moves over the area. This pattern will bring night and morning low clouds for areas west of the mountains with breezy winds across the desert slopes and deserts each day. A troughing pattern will remain into the weekend and early next week, where temperatures will rise closer to normal.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

An area of low pressure is beginning to form near Seattle and Vancouver. This system will work its way southward through Thursday, bringing in cooler than average temperatures, breezy conditions across the mountains and deserts, and a healthier marine layer. Low clouds will fill in much of the coastal basin each night and morning with patchy fog on higher terrain. Models hint that the atmosphere may be moist enough to produce some areas of drizzle Wednesday morning within 10-15 miles of the coast.

Models pinpoint the low moving as far as Northern California by Thursday. This will bring temperatures down near 5 to 10 degrees below normal for inland areas. Chances continue to increase to see highs near 85 or cooler for areas of the High Desert, Inland Empire and Inland San Diego Co valleys on Wednesday and Thursday. Sea breeze winds will increase over desert passes and deserts as well each afternoon, primarily between 20 and 40 MPH.

The low lifts out of the State and into the Northern Rockies by Friday into the weekend. This will lead to subtle warming by Friday into Saturday as a quick and weak area of high pressure nudges into the region. High temperatures will respond by increasing slightly and emerging closer to normal by Saturday. Models are beginning to come into better agreement of a weaker area of low pressure moving over the area by early next week. This would begin to cool the region by a few degrees, giving us near to slightly below average temperatures once again.

AVIATION

151800Z...Coast/Valleys...Remaining low clouds over coastal areas will clear out within the next hour or so. SKC and VFR for this afternoon. Low clouds based 1900-2400 ft MSL push back ashore 00-02z Wed in San Diego County and 02-04z in Orange County. Clouds quickly fill the coastal basin overnight. Patchy drizzle for coastal sites early Wed morning with intermittent minor cig/vis reductions possible. Clouds scatter back to the coastline 16-19z, though patchy low clouds may linger through Wed afternoon near the coast.

Mountains/Deserts...Mostly clear and VFR conditions today and tonight.

MARINE

No hazardous marine conditions are expected through Saturday.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

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