textproduct: San Diego

SYNOPSIS

High temperatures will warm through Wednesday to around 10 degrees above average for inland areas. This will be followed by a cooling trend through Saturday with Saturday high temperatures as much as 10 to 15 degrees below average for the higher mountains. A low pressure system from the northwest will bring increasing chances of showers for late Friday through Saturday along with a chance of thunderstorms on Saturday. Additional chances for showers will continue into late Sunday or Sunday night, but with lower confidence in the details. There will be stronger southwest to west winds for the mountains and deserts on Thursday and Friday with the stronger gusts to 35 to 45 mph. There could be another round of west to northwest winds of similar strength on Sunday. Then drier with a warming trend beginning early next week.

SHORT TERM (Today through Thursday)

Coastal low clouds will gradually increase in coverage over the coastal waters and coast and spread into the western valleys through sunrise. High temperatures today will be a few degrees cooler for coastal areas while inland areas warm a few to around 5 degrees for the mountains. High temperatures today will be near average at the coast to around 10 degrees above average for the mountains and deserts. High temperatures for today will range from mid 60s to around 70 near the coast to the upper 70s to mid 80s for the Inland Empire with the lower deserts in the mid 90s.

Wednesday high temperatures will be slightly warmer for the coast into the valleys with not much change for the mountains and deserts. A cooling tend will begin on Thursday with inland high temperatures a few to around 5 degrees cooler for the mountains. High temperatures on Thursday will range from around 70 near the coast to the mid 70s to lower 80s for the valleys with the lower deserts in the lower to mid 90s.

Coverage of coastal low clouds is expected to be more limited for tonight into Wednesday morning with the greater coverage across the inner coastal waters and adjacent coastal land areas. Coverage is expected to increase and spread farther inland for Wednesday night into Thursday morning as onshore flow begins to strengthen and the marine layer begins to deepen. There will also be an increase in high clouds on Thursday.

LONG TERM (Friday through Monday)

A low pressure system from the northwest will bring increasing chances for showers for late Friday through Saturday along with a chance of thunderstorms on Saturday. A second low pressure system from the northwest could bring additional showers through Sunday or Sunday night but with greater spread in the model solutions and resulting forecast details.

Through Saturday night, chances for measurable precipitation range from around 65 percent toward the coast to 80 percent in the mountain with chances for one inch or more of rainfall in the mountains around 30 percent and for one-half inch or more for coastal areas around 20 percent. The snow level will lower to around 6500 feet on Saturday and 6000 feet on Sunday.

Drying and warming will begin early next week on Monday or Tuesday.

AVIATION

070930Z...Low clouds will continue to develop and expand, eventually covering coastal areas this morning. Bases around 1000-1400 feet MSL with vis 3-5SM over higher coastal terrain. Scatter out expected by 16-17Z. Low clouds around 800-1200 feet MSL will develop after 06Z and expand through coastal areas overnight into Wednesday.

MARINE

Occasional wind gusts in the outer waters should exceed 20 knots Wednesday night. There is a 20% chance of thunderstorms Friday night and Saturday. Otherwise, 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.