San Mateo Point CA to the Mexican Border and out 30 NM Marine Forecast
| Tonight...Wind Nw 10 Kt. Seas 3 To 4 Ft. Wave Detail: Nw 2 Ft At 4 Seconds, W 3 Ft At 12 Seconds And S 1 Foot At 14 Seconds. |
| Thu...Wind W 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 2 Ft At 4 Seconds, W 3 Ft At 7 Seconds And S 1 Foot At 16 Seconds. |
| Thu Night...Wind W 10 Kt In The Evening...Becoming Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 7 Seconds And S 1 Foot At 17 Seconds. |
| Fri...Wind Variable Less Than 10 Kt...Becoming W 10 Kt In The Afternoon. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 1 Foot At 15 Seconds. |
| Fri Night...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 16 Seconds. |
| Sat...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 3 Ft At 13 Seconds And S 2 Ft At 15 Seconds. |
| Sat Night...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 15 Seconds. |
| Sun...Wind Variable Less Than 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 3 Ft At 12 Seconds And S 2 Ft At 14 Seconds. |
| Sun Night...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 3 Ft At 12 Seconds And S 2 Ft At 14 Seconds. |
| Mon...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, S 2 Ft At 14 Seconds And W 2 Ft At 15 Seconds. |
| Mon Night...Wind Variable Less Than 10 Kt. Seas 3 Ft. Wave Detail: W 1 Foot At 4 Seconds, W 2 Ft At 14 Seconds And S 2 Ft At 14 Seconds. |
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Area Forecast Discussion National Weather Service San Diego CA 926am PDT Monday May 12 2025 Synopsis Cooler conditions are expected today and Tuesday. In addition to cooler conditions, winds will increase over the mountains and into the deserts today with elevated winds continuing into Wednesday morning. There are slight chances of light showers on the coastal mountain slopes and drizzle for the coast and valleys on Tuesday. Conditions will warm for Wednesday, but remain slightly below average into the weekend. For Extreme Southwestern California Including Orange... San Diego...Western Riverside and Southwestern San Bernardino Counties Visible satellite this morning was showing low clouds from the coast, locally into the Inland Empire with high clouds streaming west to east across the area. Cloud coverage will begin to increase as a trough of low pressure moves into the Pacific Northwest today. In addition to increased cloud coverage, high temperatures today will be 10 to 20 degrees cooler than yesterday for all locations. Tuesday is expected to be the coolest day of the week, with temperatures cooling an additional 10 to 15 degrees for inland locations. As the onshore pressure gradient increases westerly winds will increase over the mountains and into the deserts through early Wednesday morning. Winds will be strongest on the desert mountain slopes, through passes, and into the deserts. Peak gusts of 40 to 55 mph expected in the deserts, with local gusts closer to 65 through wind prone passes like the San Gorgonio Pass. On the desert mountain slopes, peak gusts will be 50 to 60 mph. As the trough digs south into the Great Basin tonight into Tuesday, the marine layer will deepen. Widespread low clouds can be expected from the coast to the mountain slopes. The moisture will be deep enough that when a shortwave moves through the mean flow on Tuesday morning and when the trough axis passes Tuesday evening light showers may develop. Any shower development is most likely on the coastal mountain slopes, with the potential for some drizzle west of the mountains mainly on Tuesday morning/early afternoon. Ensemble guidance is showing a 40 to 60 percent chance of rainfall accumulations reaching or exceeding 0.10" on the coastal mountain slopes, with a 20 to 40 percent chance of rainfall accumulations reaching or exceeding 0.20" on the coastal mountain slopes. For the coast and valleys there is a less than 10 percent chance for accumulations to reach or exceed 0.20". Local high resolution WRF guidance and HRRR (High-Resolution Rapid Refresh) guidance continues to indicate rainfall rates less than 0.10" per hour Tuesday morning and evening, with only a 10 percent chance of rainfall rates exceeding 0.10" per hour on the coastal mountain slopes. The main trough axis will be to our east by Wednesday, which will allow for the winds to weaken, dry conditions to return, and for high temperatures to warm 5 to 10 degrees, locally up to 15 degrees warmer in the mountains. Most guidance indicates we will maintain an overall troughing pattern over the western United States for the remainder of the week, with a ridge of high pressure building over the Eastern Pacific. The overall troughing pattern will keep high temperatures just below the seasonal normal, maintain at least night and morning low cloud coverage, and elevated afternoon sea breezes. Over the weekend, there becomes some disagreement in the upper level pattern which will impact whether we get warmer conditions and a squashed marine layer or increased cloud coverage, winds, and cooler conditions. For example on Saturday, 40 percent of solutions show a weak trough passing through the Intermountain West, 40 percent of solutions show a deeper trough, and 20 percent show ridging over the West Coast. By Sunday, 50 percent of solutions indicate ridging with 30 percent of solutions indicating a deeper trough. Marine Strong west-northwest winds will continue through Tuesday, with sustained winds of 15 to 20 kt and gusts to 25 kt across the outer coastal waters leading to hazardous conditions for small craft, strongest winds near San Clemente Island. A Small Craft Advisory remains in effect through late Tuesday night. Winds briefly diminish late Monday through Tuesday morning, but will strengthen again Tuesday afternoon and evening. Winds taper off by Wednesday morning. 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...Wind Advisory until 5am PDT Wednesday for Apple and Lucerne Valleys-Riverside County Mountains-San Bernardino County Mountains-San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning. PZ...Small Craft Advisory until 11pm PDT Tuesday for Waters from San Mateo Point to the Mexican Border Extending 10 to 60 nm out including San Clemente Island. |
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