textproduct: San Diego

SYNOPSIS

A low pressure system from the northwest moving into the western states will bring stronger onshore flow and a cooling trend through the weekend with Sunday high temperatures near the coolest for the date for a few locations. Southwest to west winds for the mountains and deserts during the afternoon and evening will strengthen through Saturday, then weaken for early next week. The marine layer will deepen into the weekend with night and morning coastal low clouds extending well inland and onto the coastal slopes of the mountains by early Sunday with some patchy late night and early morning drizzle for the coast and valleys over the weekend. Then gradually warmer next week with high temperatures returning to near average some time late next week.

SHORT TERM (Today through Saturday)

A low pressure system from the northwest moving into the western states will bring stronger onshore flow across southern California through the weekend with the strongest onshore flow on Saturday. This will spread cooling inland through the weekend. High temperatures for today for the coast, valleys, and mountains will be a few to around 5 degrees below average with the lower deserts a few to around 5 degrees above average. High temperatures for today will range from around 70 near the coast to the 80s to around 90 for the Inland Empire with 106 to 112 for the lower deserts.

With the cooling, high temperatures on Saturday will be as much as 10 to 15 degrees below average for the mountains and inland valleys. High temperatures on Saturday will range from around 70 near the coast to the mid 70s to lower 80s for the Inland Empire with the mid 90s to 103 for the lower deserts.

Onshore flow will strengthen through Saturday with southwest to west winds for the mountains and deserts during Saturday afternoon and evening gusting to 30 to 40 mph with gusts to 75 mph in the northern Coachella Valley below the San Gorgonio Pass.

The marine layer will deepen more slowly into Friday, then more rapidly for the weekend with night and morning coastal low clouds extending into the western valleys early today, into portions of the inland valleys for early Friday, inland across much of the valleys for early Saturday, and onto the coastal slopes of the mountains for early Sunday. There could be some patchy drizzle from this deeper marine layer over the weekend.

LONG TERM (Sunday through Wednesday)

The cooling trend will continue into Sunday with high temperatures on Sunday ranging from around 70 near the coast to the 70s for the Inland Empire with the 90s for the lower deserts. High temperatures for some locations on Sunday could be near the coolest on record for the date. A slow warming trend will begin on Monday with high temperatures returning to near average some time late next week.

AVIATION

250940Z...Coast/Valleys...Uniform low clouds with bases 1000-1700ft MSL have pushed in past the coast and adjacent valleys and are now spilling into the Inland Empire. Minor vis restrictions of 2-5SM will be possible where clouds intersect terrain. Low clouds over inland areas will begin to clear 15-17Z and coastal areas 16-18Z. Low clouds may linger over coastal San Diego through 20Z. Similar to slightly higher cigs are expected to return after 01-03Z Friday.

Mountains/Deserts...VFR conditions expected through the TAF period. West-southwest winds become elevated along desert slopes and locally into deserts after 21Z. Expect gusts of 25-35 kts with gusts up to 45 kts through the Banning Pass and into the northern Coachella Valley. MOD up/downdrafts will be possible in lee of mtns.

MARINE

No hazardous marine conditions are expected through Tuesday.

BEACHES

A long-period south swell will continue to bring surf of 3 to 6 feet today with the highest surf on south facing beaches. See the Beach Hazards Statement for details.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Beach Hazards Statement through this evening for Orange County Coastal Areas-San Diego County Coastal Areas.

Extreme Heat Warning until 8 PM PDT this evening for San Diego County Deserts.

PZ...None.