textproduct: San Diego

SYNOPSIS

A cooling and drying trend will occur across the region into the weekend and early next week. This will be accompanied by a building marine layer with clouds returning closer to the coastal areas each night and morning. An area of high pressure may strengthen by the end of next week, nudging temperatures back above average.

..UPDATED AVIATION DISCUSSION FOR THE 00Z TAF PACKAGE

High pressure continues to weaken over the region today with stronger onshore flow seen at current observations. This has allowed for a deepening marine layer, where some places along the coast saw low clouds and patchy fog earlier this morning. Looking toward the lunch hour, temperatures a relatively cooler with highs in the 70s to near 90 west of the mountains. Elevated westerly winds will also be felt across the mountains and deserts with wind gusts 20-40 MPH.

An area of low pressure off the west coast of British Columbia will continue to push southward today, eventually moving into the Pacific Northwest this weekend. This weather pattern will help bring in more cooler air and greater extent to the marine layer into far western valleys. We can expect to cool a few degrees each day with breezy westerly winds across the mountains and deserts each afternoon and evening. Temperatures will be near average by the weekend, with highs dipping below average by next Monday and Tuesday. High temperatures may stay below 90 degrees for areas west of the mountains with highs closer to 100 degrees over the Coachella Valley. Low temperatures will also begin to cool off through early next week as well with lows in the 50s and 60s along and west of the mountains and up in the high desert.

High pressure over the Southern Plains may expand further into the desert southwest by the end of next week. The placement and strength of this system is still uncertain, but many models are hinting that another subtle warm up may take place by this time. NBM shows highs approaching 100 across inland valleys with 70s and 80s closer to the coast and across the mountains.

AVIATION

130000Z...Coasts/Valleys...Low clouds (based around 1400ft MSL) have stuck near the beaches through the afternoon and have snuck back in a few miles onshore, bringing intermittent CIGs to KSAN and KCRQ. Over the next few hours, expecting these marine layer clouds to surge inland, spreading inland and into Orange County through 03-06z Sunday. By 06z, marine layer clouds should stretch around 20 miles inland with overnight bases around 1300-1500ft MSL. There is about a 60% chance that CIGs reach KONT between 11-16z with a ~30% chance to reach KSBD during this window. VIS reductions limited to higher inland terrain. Clouds begin to scatter out 16z Sunday morning, eventually scattering at the coasts around 18z. As with what was seen today, clouds may linger near the beaches or just offshore into Sunday afternoon, with a chance for intermittent CIGs to return to the coastal TAF sites as early as 21-22z Sun.

Mountains/Deserts...S/W winds gusting over 30 kts at times until 06z Sunday through mountain passes into the deserts. Otherwise, VFR conditions prevail through Sunday evening.

MARINE

West-northwest winds expected to gust up to 20 knots in the outer coastal waters Sunday afternoon. Otherwise, no hazardous marine conditions are expected through Wednesday.

SGX WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...None.