textproduct: San Diego

SYNOPSIS

A low pressure system moving southward into the Great Basin will maintain cool, showery weather today with showers ending from the northwest tonight. It will be warmer and dry for Wednesday through Saturday with developing Santa Ana winds strengthening for Friday into Saturday. Moderate HeatRisk could return for the coast into the western valleys for Friday through Sunday.

SHORT TERM (Today through Wednesday)

A closed low pressure system centered over Oregon early this morning will move southward into Nevada today and tonight, then move east for Tuesday night and Wednesday.

More widespread showers will continue along and west of the mountains through the morning. The greater coverage during the afternoon will be for the inland valleys into the mountains. Showers will continue into the evening, then decrease and end from the northwest by Tuesday morning.

Through tonight, additional rainfall could range from 0.10 to 0.25 inch near the coast to 0.50 to 0.75 inch in the mountains, locally to 1.25 inches on the coastal slopes of the San Bernardino Mountains. The snow level will lower to 7500 feet for this afternoon and to 6500 feet by late this evening. There could be a few inches of snowfall on the higher peaks, mainly above 7500 feet. For areas that clear late tonight, there could be some patchy dense fog for late tonight into early Tuesday for lower- lying portions of the Inland Empire and the adjacent mountains in San Bernardino and Riverside Counties.

High temperatures for today will remain around 5 degrees below average near the coast to 15 to 20 degrees below average for the mountain, deserts, and inland valleys. High temperatures for today for the coast and valleys will range from the lower to mid 60s for the inland valleys to around 70 near the coast. High temperatures in the lower deserts will be mostly in the mid to upper 70s. Not much change is expected in high temperatures on Tuesday for the desert. There will be warming of a few degrees near the coast to around 5 degrees for the inland valleys into the mountains.

High pressure off the California coast and developing offshore flow on Wednesday will bring greater warming with high temperatures warming around 5 degrees near the coast to 8 to 12 degrees for the inland valleys into the mountains. High temperatures on Wednesday will be mostly in the mid 70s to around 80 for the coast and valleys with some of the western valleys reaching the lower 80s. High temperatures for the lower deserts will be in the lower to mid 80s.

LONG TERM (Thursday through Sunday)

High pressure off the California coast will expand across northern and central California while low pressure develops over northern and central Baja. High temperatures will continue to warm through Friday. High temperatures on Friday will be a few degrees below average for the deserts to 5 to 10 degrees below average for the mountains. For the coast and valleys, high temperatures will range from a few degrees above average for the inland valleys to 10 to 15 degrees above average for coastal areas. High temperatures on Friday for the coast and valleys will range from the upper 70s for the far inland valleys to the lower to mid 90s for the western valleys and inland coastal areas. Areas near the coast will be mostly in the 80s.

High temperatures on Saturday will cool a few degrees while inland areas warm a few to around 5 degrees on Sunday. For Friday through Sunday where will be Moderate HeatRisk for coastal areas into the western valleys, the result of hot days and warmer nights. That Moderate HeatRisk would be supportive of Heat Advisories for those areas.

There could be moderate strength east to northeast Santa Ana winds at times for Thursday through Saturday with ECMWF ensemble output strongest on Friday.

AVIATION

121130Z...Coastal/Inland Basin...SCT -SHRA will continue today with cigs 2500-3000 feet MSL in -SHRA, otherwise bases 3500 feet MSL. -SHRA tapering off and gradually scattering out after 03Z KSNA/KONT and after 12Z Tuesday at KCRQ/KSAN.

Mountains...SCT -SHRA will continue through 00Z. BKN-OVC MVFR cigs and obscured terrain will linger through Mon afternoon, with occasional vis 2-5 SM with -SHRA. Clearing north to south tonight.

Deserts...SCT -SHRA with occasional BKN clouds based around 5000- 7000 feet MSL this morning, scattering out during the afternoon.

MARINE

No hazardous marine conditions are expected through Friday.

BEACHES

A combo southerly and westerly swell will continue through Tuesday, generating surf 3-5 feet with local sets to 7 feet, along with strong rip currents. Late morning high tides near 7 feet will continue, producing minor coastal flooding. Check the Coastal Flood Advisory for details.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Coastal Flood Advisory until 2 PM PDT Tuesday for Orange County Coastal Areas-San Diego County Coastal Areas.

PZ...None.