textproduct: San Diego

SYNOPSIS

Showers will finish early this morning, while winds will diminish later this morning. Patchy frost and fog are likely in the Inland Empire this morning. Fair, dry and warmer weather is expected over the weekend, and will likely persist through next week.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

Showers are coming to an end and strong winds are on the decrease this morning. Just a few more hours remain on the wind advisories and the winter storm bulletins in the mountains and desert slopes. Gusts to 40-50 mph can be expected through sunrise. And just like that, the long parade of storms this week will be finished. There's some clearing in OC and the Inland Empire, which could lead to two things this morning in the IE: ground fog and patchy frost. After that skies will be partly cloudy today regionwide. Temperatures will be on the low side, 5-15 degrees lower than normal; only a few places at lower elevations will achieve 60+ degrees, High pressure tepidly builds this weekend, and there is also an offshore pressure gradient that develops tonight and Saturday. That will produce areas of offshore easterly winds through the peninsular mountains locally into inland valleys. That will boost the warming trend west of the mountains. The offshore flow eases some on Sunday, but the warming trend accelerates and continues into Monday. High temperatures will be in the 60s Saturday, 70s Sunday, and a few spots should hit 80 degrees Monday. Skies will have periods of high clouds, but the sun will shine through most of the time. Our upper ridge of high pressure over California will amplify some next week. A plume of moisture tries to approach SoCal next Wednesday, but now nearly all model guidance steers that moisture into northern and central California. Confidence is nearly 100% that SoCal will stay dry through at least Friday. It will be a little cooler Tuesday through Thursday as weak onshore flow returns, but still well above normal. The ridge appears to amplify later next week, which if it does, could produce widespread temperatures in the 80s in the valleys, and lower 90s in the low desert on Friday.

AVIATION

200930Z...-SHRA are diminishing in coverage and are confined mostly to inland SD County. SCT-BKN clouds based 3-6 kft MSL becoming FEW- SCT overnight over the coastal basin. FG and ISO -SHSN continue to intermittently reduce vis to 0-2SM in the mtns above 5000 ft MSL. IFR cigs over mountain valley sites through 13z, including KL35. All precipitation is expected to fully taper off by 14z this morning. VFR conditions prevail region-wide thereafter with the local exception where SCT daytime cumulus clouds based 4-6 kft meet terrain over the mountains.

Winds will remain strong through 14-16Z Fri for east facing mtn slopes and locally into the deserts in Riverside/San Diego Counties. Gusts reaching 35-50 kts along desert slopes and through mtn passes. Moderate up/downdrafts in the lee of mtns.

MARINE

Strong northwest winds gusting to 25 knots combined with choppy 7-9 feet seas will continue producing hazardous conditions for small craft overnight. Winds and seas diminish slowly throughout the morning. Otherwise, no other marine hazards are expected through Tuesday.

BEACHES

High surf of 3 to 5 feet with sets as high as 7 feet, especially at west facing San Diego County beaches, to diminish this afternoon. Dangerous swimming and surfing conditions and localized beach erosion can be expected until then. A High Surf Advisory is in effect through today and contains more details.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...High Surf Advisory until 10 PM PST this evening for Orange County Coastal Areas-San Diego County Coastal Areas.

Wind Advisory until 2 AM PST early this morning for Orange County Coastal Areas-Orange County Inland Areas-San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Coastal Areas-San Diego County Valleys- Santa Ana Mountains and Foothills.

Winter Storm Warning until 9 AM PST this morning for Riverside County Mountains-San Bernardino County Mountains.

Winter Weather Advisory until 9 AM PST this morning for San Diego County Mountains.

Wind Advisory until 9 AM PST this morning for Apple and Lucerne Valleys-Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.

PZ...Small Craft Advisory until 10 AM PST this morning for Coastal Waters from San Mateo Point to the Mexican Border and out to 10 nm-Waters from San Mateo Point to the Mexican Border Extending 10 to 60 nm out including San Clemente Island.