textproduct: San Diego

SYNOPSIS

High temperatures will warm several degrees for today and Wednesday to within a few degrees of average on Wednesday with the greatest warming for the inland valleys. Monsoonal moisture from the south on Thursday will bring a slight chance of showers and thunderstorms during the afternoon. Drying aloft with not much change in temperatures for Friday and Saturday with a low pressure system moving inland along the West Coast bringing cooling for Sunday and Monday.

SHORT TERM (Today through Thursday)

A weak low pressure system will develop off the coast of northern Baja today and linger into Thursday with weak lower-level easterly flow and east winds for the mountains at times on Wednesday and Thursday. High temperatures for today will warm a few degrees near the coast to 5 to locally 10 degrees for the inland valleys onto the coastal slopes of the mountains. Similar warming will occur again on Wednesday from the coast to the mountains with warming also spreading into the deserts. There will be little additional warming on Thursday.

High temperatures on Wednesday will be within a few degrees above or below average for most areas with high temperatures ranging from the mid to upper 70s near the coast to the upper 80s to mid 90s for the Inland Empire with the lower deserts around 100.

On Thursday, that weak low pressure system off the northern Baja coast could draw some mid-level monsoonal moisture northward into southwestern California with a slight chance of showers and thunderstorms for the mountains during the afternoon.

The marine layer is still around 4500 feet deep with low clouds over the coastal waters extending well inland across the coast and valleys and onto the lower coastal slopes of the mountains. The marine layer is expected to decrease in depth for Wednesday and Thursday with night and morning coastal low clouds not spreading as far inland.

LONG TERM (Friday through Monday)

That weak low pressure system off the northern Baja coast will weaken and move inland on Thursday with drier westerly flow aloft for Friday and Saturday. High pressure aloft over northern Mexico and southern Texas will expand westward across Baja during the weekend with Hurricane Polo remaining on a west-northwest track along the southern edge of the upper high.

Not much change in high temperatures is expected for Friday and Saturday with a low pressure system moving inland across the western states bringing cooling for Sunday and Monday.

AVIATION

221130Z...Coast/Valleys...Low clouds with bases 3500-4000 feet MSL, but with occasional cigs around 2500 feet, will continue over most of the coastal basin this morning. Scatter out vcnty KSAN 15-17Z, and 16-18Z elsewhere. Areas of low clouds based around 1500-2500 feet MSL to develop vcnty KSAN after 03Z, gradually spreading across coastal areas northward overnight. Most bases will lower to around 1500 feet MSL after 06Z overnight into Wednesday.

Otherwise...mostly clear skies today and tonight.

MARINE

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.