The marine layer has deepened to around 4500 feet with a few light showers possible near the San Diego County coast early this morning. Weak offshore lower-level flow will develop today and continue into Friday morning. Northeast winds along and below the coastal slopes of the mountains will mostly gust to 35 mph or less, except to 45 mph near the Cajon Pass and near the coastal slopes of the Santa Ana Mountains. The coast will warm briefly on Thursday before cooling slightly for Friday and Saturday while inland areas will warm steadily for Thursday through early next week with high temperatures next Tuesday as much as 12 to 18 degrees above average for the valleys.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Friday), The marine layer has deepened to 4500 to 5000 feet with coastal low clouds extending well inland and onto the coastal slopes of the mountains. Radar has shown some weak returns over the inner coastal waters of San Diego County moving locally inland along the coast. There have been a couple of locations in coastal San Diego County that have received 0.01 inch of rainfall with sprinkles possible in some San Diego County coastal areas early this morning.
The lower-level flow will go weakly offshore today with weak offshore flow continuing into Friday morning. Model guidance has trended weaker with the offshore flow and associated northeast winds. Northeast winds along and below the coastal slopes of the mountains will mostly gust to 35 mph or less, except to 45 mph near the Cajon Pass and near the coastal slopes of the Santa Ana Mountains.
High temperatures today will be cooler for inland areas, as much as 10 to 15 degrees cooler for the higher elevations in the mountains. High temperatures for the coast and valleys will warm a few to around 5 degrees on Thursday, then cool a few degrees near the coast on Friday as high temperatures for inland areas warm as much as 5 to 10 degrees for the mountains and high desert.
(Saturday through Tuesday), There will be high pressure aloft over the eastern Pacific off the California coast with dry generally northwest flow aloft across southern California. There will be a gradual warming trend for Saturday through Tuesday. High temperatures on Saturday will range from the mid 60s near the coast to upper 60s to mid 70s for the valleys with the 70s for the lower deserts. With the warming, high temperatures next Tuesday will be as much as 12 to 18 degrees above average for the valleys. High temperatures for next Tuesday will range from the lower 70s near the coast to the upper 70s to mid 80s for the valleys with the lower 80s for the lower deserts.
031030z. Coasts/Valleys/Foothills, BKN low clouds based 2500-3500 feet MSL and tops to 5000 feet will continue this morning, at times obscuring foothills. Isold -DZ briefly lowering clouds to 2000 feet MSL and vis 3-5SM through 15Z. Clouds will randomly and intermittently scatter out from time to time this morning. Full scatter out expected 14-18Z. North to northeast winds gusting 20-30 kts in foothills will eventually spread into valleys below the Cajon Pass after 18Z (including vcnty KONT). These winds will strengthen to as high as 45 kts in foothills after 04Z. Areas of LLWS and MOD up/downdrafts in lee of mountains.
Higher Mountains/Deserts, VFR conditions today and tonight with SCT to locally BKN high clouds AOA 20 kft. West winds this morning gusting 25-40 kts through mountain passes and along east-facing slopes will weaken through 18Z.
No hazardous marine conditions are expected today through Sunday.
Very high tides will occur each morning today through Friday, threatening coastal flooding, minor tidal overflow and beach erosion. Chances of these impacts are higher this morning and Thursday morning as elevated surf up to 5-6 feet combines with the high tides, mostly in San Diego County. Check the Coastal Hazard Message for details.
Ca, Beach Hazards Statement through Friday morning for Orange County Coastal Areas-San Diego County Coastal Areas.
PZ, None.
