San Clemente Island CA to Guadalupe Island from 60 NM offshore west to 120W Offshore Forecast
| Today...Nw Winds 15 To 25 Kt. Seas 6 To 10 Ft. |
| Tonight...Nw Winds 10 To 20 Kt. Seas 6 To 9 Ft. |
| Fri...Nw Winds 5 To 15 Kt. Seas 5 To 7 Ft. |
| Fri Night...Nw Winds 5 To 15 Kt. Seas 5 To 7 Ft. |
| Sat...Nw Winds 5 To 10 Kt. Seas 4 To 7 Ft. |
| Sat Night...Nw Winds 10 To 15 Kt. Seas 4 To 6 Ft. |
| Sun...Nw Winds 5 To 10 Kt, Becoming 5 To 15 Kt. Seas 4 To 6 Ft. |
| Sun Night...Nw Winds 10 To 15 Kt. Seas 4 To 6 Ft. |
| Mon...Nw Winds 10 To 15 Kt. Seas 4 To 6 Ft. |
| Mon Night...Nw Winds 15 To 20 Kt. Seas 5 To 7 Ft. |
| Area Forecast Discussion National Weather Service San Diego CA 756pm PDT Wednesday September 11 2024 Synopsis Stronger onshore flow across southern California will continue to spread cooling inland. The marine layer will deepen with areas of night and morning coastal low clouds spreading farther into the valleys and onto the foothills by the weekend. Below average temperatures will continue through the weekend then another low pressure system will bring about 5 to 10 degrees of additional cooling for early next week. For Extreme Southwestern California Including Orange... San Diego...Western Riverside and Southwestern San Bernardino Counties .Evening Low clouds continue to move over the coastline this evening with cloudy skies taking form over much of San Diego. Forecast remains on track with latest model guidance in bringing in low clouds for most western valleys through the early morning hours, with a small chance of low clouds reaching the Inland Empire. Onshore flow will decrease this evening and lightly continue with the troughing pattern into Thursday, with desert areas becoming near 5 degrees cooler than they saw today. Minimal changes will occur through the weekend. Probabilities still look low in seeing any precipitation with this troughing pattern, but are non-zero. A better chance exists by early next week, as a colder closed low moves near the area. From previous discussion... This afternoon...Low clouds persist over the coastal waters and at a few beach locations but will likely return to the coastal areas and spread inland to the foothills overnight. Temperatures are generally lower than at this time yesterday, with some inland locations as much as 15 to 18 degrees cooler. Through Friday...The relative humidity for the deserts onto the desert slopes of the mountains will fall to 5 to 10 percent this afternoon. This very low humidity combined with southwest to west winds gusting 30 to 40 mph will create critical fire weather conditions for the deserts on the lower desert slopes of the mountains this afternoon and early evening. West of the mountains, additional cooling and deepening of the marine layer will bring a greater recovery in humidity for Thursday and Friday, with weakening winds. Cooling will continue today with high temperatures an additional 5 degrees cooler than Tuesday to as much as 10 to 15 degrees cooler for the valleys and inland Orange County. High temperatures for the inland valleys will be mostly in the 80s, with high temperatures for the coast and valleys 5 to locally 10 degrees below average. High temperatures on Friday will change little near the coast with the deserts becoming another 5 degrees cooler. The marine layer will continue to deepen into Friday with the coastal low clouds spreading farther into the valleys each night. The smoke from the Bridge, Line and Airport fires will continue to spread off toward the east and northeast and across the deserts with flow aloft from the southwest to west. Saturday through Tuesday Numerical models are beginning to converge on a solution, with some narrowing of the ensemble spread with respect to timing and trajectory. The next low pressure system will likely move inland along the West Coast some time around late Sunday into Monday. After cooling for today into Thursday, there will be only minor day to day differences in high temperatures for Friday through the weekend. Additional cooling is expected for next Monday and Tuesday, with high temperatures in the mountains and inland valleys falling to 15 to 20 degrees below average with high temperatures for the inland valleys mostly in the 70s and high temperatures for the lower deserts in the 80s and lower 90s. Night and morning coastal low clouds will continue to spread into portions of the inland valleys over the weekend and spread onto the lower coastal slopes of the mountains early next week. It's possible there could be some light precipitation from the marine layer around Monday with NBM chances of measurable precipitation from the coast to the mountains of 15 to 20 percent. After the stronger onshore winds this afternoon and evening, most model ensemble members show weaker winds through the weekend then another round of similarly strong winds next Monday with the inland movement of the next low pressure system. Marine No hazardous marine conditions are expected through Monday. Skywarn Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. NOAA San Diego CA Office: Watches - Warnings - Advisories CA...None. PZ...None. |
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