textproduct: San Diego

SYNOPSIS

Showers are ending this morning as the system moves to the east. Cooler and breezy conditions will continue through Thursday with west winds in the mountains and deserts gusting 35 to 45 mph. Locally gusting to 55 mph. For Friday and Saturday, offshore surface flow and high pressure aloft will bring warming and drying with northeast winds along and below the coastal slopes of the mountains gusting 30 to 40 mph. Then slightly cooler with weaker winds for early next week.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

Wednesday through Friday...The low-pressure system has moved east, ending the rain over the area. Most of the rain fell in the San Bernardino mountains (0.15"-0.93"), then the Inland Empire (0.08"-0.79"), and Orange County(0.01"-0.27"). San Diego County came in with amounts 0.01"-0.14" with the higher amounts occurring around Palomar Mountain. Precip chances will continue to trend lower through the day, falling below 10% overnight tonight.

Westerly winds have picked up on the eastern side of the mountains, especially on the northern end of the Coachella Valley. Gusts on the western side of the mountains are currently 25-35 mph with Coachella showing gusts of 30-40 mph. Wind gusts are expected to reach 35-45 mph in the mountains and deserts today and tomorrow with gusts locally up to 55 mph.

Temperatures will trend lower today and Thursday with highs in the mid 60s to low 70s along the coasts and valleys, 50s to low 60s in the mountains, mid 60s to mid 70s in the High Deserts, and in the 80s in Coachella and San Diego deserts.

Friday, winds at the surface shift to offshore as high pressure builds aloft. This will bring higher temperatures to the coasts and valleys with temperatures 5-10 degrees above the seasonal average. Northeast winds will be breezy with the highest winds in the coastal slopes and mountain areas. Gusts of 35-45 mph area expected in desert areas and the San Diego Valley. Stronger wind gusts of 50-65 mph will be possible on coastal mountain slopes and adjacent valleys.

Saturday through Wednesday... Offshore winds continue into Saturday as high pressure continues to fill in over the area. Expect wind gusts of 40 to 50 mph in the coastal slopes of the mountains and deserts, locally 55-60 mph. High temperatures will be in the 70s and mid 80s along the coast and in the valleys, upper 50s to mid 70s in the mountains, and 80s to low 90s in the Coachella Valley and San Diego deserts.

Conditions west of the mountains will cool Sunday as onshore flow returns. Temperatures will continue to increase in the mountains and deserts. Next week, temperatures fluctuate a few degrees into mid- week with mostly clear skies in the afternoon.

AVIATION

011700Z...Coast/Valleys...SCT-BKN cloud layers 2500-6000 ft MSL continuing through the morning. Subtle scatter out from north to south after 18Z, with only intermittent clearing in San Diego County valleys/foothills this afternoon. Low clouds fill in once again gradually after 00Z and eventually fill the coastal basin with bases 2000-3000 feet MSL overnight into Thursday.

Mountains/deserts...Areas of higher terrain obscured through much of the day with some intermittent clearing this afternoon. Layered bases up to 12 kft MSL. Strong westerly winds 30-40 knots with gusts 50 knots over mountain ridges, through mountain gaps, and desert slopes today; gusts near 30 kts possible VCTY KPSP/KTRM. MOD up/downdrafts in lee of mountains, and areas of vis reduced to 2-5SM in BLDU in deserts. Winds becoming more localized to mountains after 06Z Fri.

MARINE

No hazardous marine conditions expected through Thursday morning and Friday through Sunday. Areas of northwest wind gusts to exceed 20 knots late Thursday in the outer waters.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Wind Advisory until 11 PM PDT Thursday for Apple and Lucerne Valleys-Coachella Valley-Riverside County Mountains-San Bernardino County Mountains-San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning.

PZ...None.