textproduct: San Diego

SYNOPSIS

Patchy coastal low clouds for this morning will become more widespread and spread onto the coastal slopes of the mountains for late tonight into early Wednesday as the marine layer rapidly deepens. Gusty north winds will develop through and below the Cajon Pass on Wednesday afternoon with more widespread and stronger northeasterly Santa Ana winds for Wednesday night along and below the coastal slopes of the mountains with the stronger gusts to around 45 mph. Northeast to east winds will continue for Thursday into Friday morning, but with decreasing coverage and strength. High temperatures will cool to a few degrees above average on Wednesday. This will be followed by warming into early next week with high temperatures for Tuesday of next week 10 to 15 degrees above average for inland areas.

SHORT TERM (Today through Thursday)

The marine layer is around 1000 to 1500 feet deep early this morning. Satellite imagery shows coverage of low clouds is quite patchy for the coastal waters and adjacent coastal areas with the greatest coverage over northern Orange County.

A low pressure system moving southward into the Great Basin tonight will strengthen the onshore flow across southern California. The marine layer will deepen rapidly through tonight. The marine layer will deepen to around 4500 feet for early Wednesday morning with coastal low clouds spreading well inland and onto the coastal slopes of the mountains. There could be some light showers or patchy drizzle late tonight into early Wednesday morning for the inner coastal waters into adjacent coastal areas with the chance of measurable rainfall less than 10 percent.

Gusty north winds will develop through and below the Cajon Pass on Wednesday afternoon with more widespread and stronger northeasterly winds for Wednesday night along and below the coastal slopes of the mountains with the stronger gusts to around 45 mph. Northeast to east winds will continue for Thursday into Friday morning, but with decreasing coverage and strength. Lowest daytime humidity on Thursday for the valleys and inland coastal areas will fall to 15 to 20 percent, then recover to 20 to 25 percent on Friday.

Cooling will spread inland through Wednesday with high temperatures on Wednesday a few degrees below average. High temperatures for the coast and valleys will warm a few to around 5 degrees on Thursday with the warming spreading inland on Friday through the weekend.

LONG TERM (Friday through Monday)

Northeast to east winds will continue to weaken through Friday morning with the stronger gusts to 35 mph on Friday morning. Dry weather with a warming trend will continue into early next week. With the warming, high temperatures for Tuesday of next week will be 10 to 15 degrees above average for inland areas. High temperatures for next week will range from the lower 70s near the coast to the mid 70s to lower 80s for the valleys with the lower deserts around 80.

AVIATION

021030Z....Patchy and intermittent coastal low clouds and fog will continue this morning through 16Z. Bases with any cigs that form will be 500-900 feet MSL, with vis 1-5SM. Isolated vis 0-1SM. More widespread low clouds to develop after 01Z rapidly and move fully inland to nearly fill the entire coastal basin overnight into Wednesday. Bases would start out fairly low 500-1000 feet MSL, but will rise to 1800-2500 feet MSL with tops rising above 4000 feet. Locally reduced vis over higher coastal terrain and foothills.

MARINE

No hazardous marine conditions are expected today through Saturday.

BEACHES

Astronomical high tides are forecast to occur each morning Wednesday through Friday, threatening minor tidal overflow and beach erosion. Chances of these impacts are higher Wednesday and Thursday mornings as elevated surf up to 4-6 feet combines with the high tides, especially for San Diego County. Check the Coastal Hazard Message 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 from this evening through Friday morning for Orange County Coastal Areas-San Diego County Coastal Areas.

PZ...None.