Swell Matrix

Area Forecast Discussion

National Weather Service San Diego CA

903 pm PDT Fri apr 3 2026

Synopsis

Santa Ana winds have developed and are gusting 35-45 mph, locally up to 65 mph along and below the coastal slopes of the mountains and into the Inland Empire. The winds will weaken somewhat overnight, with more localized winds and gusts 35 to 40 mph continuing into the early afternoon Saturday. Temperatures will increase slightly Saturday, with high temperatures 10 to 15 degrees above average in the coast and valleys. Inland areas will continue to warm on Sunday while coastal areas begin to cool with only slight changes for Monday and Tuesday. Wednesday and Thursday, high pressure aloft will weaken and onshore flow will strengthen. High temperatures will cool with Thursday high temperatures around 3 to 5 degrees below average.

Discussion

For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,

This evening, Santa Ana winds contiue but not as strong as earlier in the day. The windiest locations are currently reporting northeast winds gusting 40-47 mph. See our Public Information Statement (PNS) for a listing of the strongest gusts today. High temperatures today ranged from the 60s to the 80s in the coastal areas, the 70s to upper 80s in the valleys and the 80s in the low deserts.

From previous discussion, Through Sunday, High pressure continues to build aloft over the area today, keeping the winds offshore and bringing in some warmer temperatures. Northeast winds have already peaked and will continue to slowly weaken into Saturday. Wind gusts around 35-50 mph will still be possible along and below the coastal slopes of the mountains through the early afternoon Saturday. High temperatures Saturday will warm 3-5 degrees over the area. Sunday, conditions west of the mountains will cool, with temperatures continuing to increase in the mountains and deserts.

Monday through Friday, Next week, high temperatures will fluctuate a few degrees going into Wednesday with mostly clear skies in the afternoon Tuesday and Wednesday. Low pressure looks to move in towards the end of next week, increasing chances for precipitation. Models are in some disagreement on how much precipitation and when exactly the rain will fall but, as of right now, there is a slight chance of showers early Thursday through Friday afternoon.

Aviation

040500z, Expecting VFR conditions to prevail through Saturday evening with offshore flow. Elevated north to northeast winds are currently gusting 25-35 kts along coastal slopes, foothills, through passes, and locally into the Inland Empire. Areal coverage of elevated winds decreases overnight for the Inland Empire, but increases again late Saturday morning. Winds finally diminish for all areas late Saturday afternoon.

There is a chance (40-50%) for a small area of BKN low clouds to develop over coastal San Diego County (near KSAN) from 09-15Z Sat. If low clouds develop, bases will be 1500-2500 ft MSL.

Marine

No hazardous marine conditions expected through Wednesday.

Watches, Warnings, Advisories

Ca, Wind Advisory until 1 PM PDT Saturday for Orange County Inland Areas-San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Gorgonio Pass near Banning-Santa Ana Mountains and Foothills.

PZ, None.

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