Showers are expected to end this morning from northwest to southeast. Cooler and breezy conditions will continue through Thursday with west winds in the mountains and deserts gusting to 35 to 45 mph with isolated gusts to 55 mph. For Friday and Saturday, offshore lower-level flow and high pressure aloft will bring warming and drying with northeast winds along and below the coastal slopes of the mountains gusting to 30 to 40 mph. Then slightly cooler with weaker winds for early next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(Wednesday through Friday), Showers have been spreading into portions of southwest California from the west since late Tuesday afternoon. The showers are expected to decrease from northwest to southeast during this morning. In general, rainfall has been greater to the north and less to the south and greater in the mountains with less at lower elevations. Showers that moved through the Ontario airport area produced one-third to three-quarters of an inch in the four observations nearest the airport. The more widespread showers moving through northern portions of the Inland Empire around 2 AM could produce another one-quarter to one-third inch with isolated rainfall to around three-quarters of an inch.
Beyond the showers this morning, it will be cooler today and Thursday with high temperatures near sea level around average to around 5 degrees below average for the mountains and inland valleys. High temperatures for the coast and valleys will be mostly in the 60s and lower 70s with the lower deserts in the 80s. There will also be west winds for the mountains and deserts with gusts to 35 to 45 mph.
For Friday, the lower-level flow will go offshore with strengthening high pressure aloft. Areas of northeast winds along and below the coastal slopes of the mountains will gust to 30 to 40 mph. High temperatures on Friday will warm as much as 10 to 15 degrees with high temperatures ranging from the lower to mid 70s near the coast to the upper 70s to mid 80s for the valleys and inland Orange County with the lower deserts in the 80s.
(Saturday through Tuesday), Offshore flow with warming and gusty northeast winds will continue into Saturday. High temperatures on Saturday will warm another few degrees near the coast to 4 to 8 degrees inland with high temperatures ranging from from the 70s near the coast to the 80s for the valleys and inland Orange County with the lower deserts in the upper 80s to mid 90s,
For Sunday, the coast will begin to cool with the mountains and deserts continuing to warm. Cooling will spread inland on Monday followed by slight warming on Tuesday and slight cooling on Wednesday.
010930z, Coast/Valleys, Layers of cloud bases between 3500-9000 feet MSL, but with bases in RA dropping to as low as 1500 feet. RA and lower cigs to move out from northwest to southeast 11-15Z. Some cigs and isold -SHRA to linger in the foothills through 17Z. Scatter out first at coast mostly by 18Z, inland by 20Z, but not in foothills. 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 16-18Z along with RA through 15Z. 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.
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.
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.
