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Forecast Discussion for San Diego, CA
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000 FXUS66 KSGX 260359 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 859 PM PDT Mon Mar 25 2019 .SYNOPSIS... The dry and mild through Tuesday, along with increasing high clouds as a low pressure trough moves inland to the north. Onshore flow will increase Wednesday, bringing cooling and a small chance of scattered, light showers. An approaching ridge will begin a warming trend on Friday, with further warming and drying through the weekend as offshore flow develops. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... UPDATE...Patchy low clouds have developed along the San Diego County coast this evening and high clouds spreading in from the west. Expect any low clouds and fog to remain patchy and mostly confined to central and southern San Diego County overnight. FROM PREVIOUS DISCUSSION... A weak ridge aloft will move east tonight as low pressure off the PacNW coast drifts slowly east. Precipitation associated with the storm system will spread SE across northern and central parts of the State through Wednesday, possibly reaching SoCal Wed night/Thu morning. For now, any amounts look very light as onshore flow ramps up and the marine layer spreads clouds and fog back onto the coastal mtn slopes. The 12Z global model runs show fair agreement now in weakening the low as it slides inland beneath the strong west Canadian ridge this coming weekend. This in turn, has increased confidence in keeping the weekend dry and mild with little impactful weather expected. The GFS keeps the weather dry early next week, but the ECMWF turns wet. This is beyond the current forecast period so we will have some time to sort it out. Slight cooling on Tuesday. Wednesday and Thursday will be the coolest days, along with gusty winds over the mts and deserts. Daytime temps should be about average by Friday, then back above by a few degrees over the weekend. A wind advisory may be needed at some point for the gusty onshore winds late Wed/Thu. && .AVIATION... 260230Z...Coast/Valleys...Scattered to broken high clouds through Tuesday. Pockets of intermittent low clouds at KSAN and KCRQ between 07Z-16Z with bases near 1,500 feet. Mountains/Deserts...Scattered to broken high clouds through Tuesday. && .MARINE... No hazardous marine weather through Tuesday. Isolated light showers are possible late Wednesday into Thursday morning as a trough passes by to the north. Gusty northwest winds of 15-25kt will follow the trough and may result in boating conditions hazardous for small craft Thursday afternoon and evening. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && $$ PUBLIC...SS/10 AVIATION/MARINE...Moede |
Previous Forecast Discussions may be found at
NWS San Diego, CA (SGX) Office Forecast Discussions.
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