Area Forecast Discussion
Issued by NWS San Diego, CA

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS66 KSGX 251220 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 520 AM PDT Mon Mar 25 2024 .SYNOPSIS...
-- Changed Discussion --
There is a chance for light showers for late tonight into Tuesday morning, mainly for San Diego County from the coast to the mountains. There will be periods of gusty west winds for the mountains and deserts for late this afternoon through Tuesday morning with the stronger gusts to 45 to 55 mph. Otherwise drier and warmer through the middle of the week with weakening winds. For Friday night through Monday, a slow moving low pressure system will bring periods of precipitation with the most likely time for heavier precipitation on Saturday and Sunday.
-- End Changed Discussion --
&& .DISCUSSION...
-- Changed Discussion --
FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Wednesday)... A cool northwest flow pattern will persist into Tuesday with a warming trend. HREF shows a chance for light showers for late tonight into Tuesday morning, mainly for San Diego County from the coast to the mountains. There will also be another round of gusty west winds for the mountains and deserts for late this afternoon into Tuesday morning with the stronger gusts along the desert slopes of the mountains to 45 to 55 mph. High pressure aloft will move inland across the western states on Wednesday with additional warming of high temperatures for the mountains of as much as 10 degrees with high temperatures for most areas on Wednesday slightly below average.
-- End Changed Discussion --
&& .LONG TERM (Thursday through Sunday)...
-- Changed Discussion --
A low pressure system over the eastern Pacific will begin to strengthen the onshore flow on Thursday with high temperatures mostly a few degrees below average. The center of that low pressure system is expected to be off the Pacific Northwest coast on Thursday, moving southward off the California coast on Friday and Saturday, then moving slowly eastward and inland for Sunday and Monday. Cluster analysis shows the relatively wetter clusters for Saturday are those that are slightly faster and farther east with the placement of the low pressure system while those that are relatively wetter for Sunday and Monday are those that are slower with the eastward movement of the low pressure system. There is the potential for locally heavy precipitation during next weekend, especially along the coastal slopes of the mountains, but lower confidence on when that might occur during the weekend. NBM chances for measurable precipitation on the coastal slopes of the mountains exceeds 80 percent for the weekend with around a 30 to 40 percent chance for 2 inches or more of rainfall in a 24 hour period for the wetter locations. Snow levels will lower from around 6500 feet on Saturday to 5000 to 5500 feet for Saturday night and Sunday with the greatest spread in the height of the snow levels from Friday into Sunday, narrowing by Monday.
-- End Changed Discussion --
&& .AVIATION...
-- Changed Discussion --
250930Z...Coasts/Valleys...SCT clouds 2000-3000 feet MSL today and tonight, except occasionally BKN mainly inland valleys of San Diego County through 17Z. Then mostly clear through the afternoon. Low clouds based around 2000-3000 feet MSL forming after 02Z, most likely inland and in San Diego County. Tops rising to 4000 feet. Patchy -DZ after 06Z into early Tuesday. Mountains...SCT locally BKN clouds at 3000-4000 feet MSL through 17Z. Cumulus at 8000 feet MSL over ridges 17-01Z. Low clouds based at 2000-3000 feet MSL with tops to 5000 feet forming on coastal foothills after 02Z. Patchy -DZ after 06Z into early Tuesday. Deserts...Mostly clear today and tonight. Northwest winds increasing to 20-30 kt after 20Z in desert slopes and locally into adjacent deserts. MOD up/downdrafts in lee of mountains and pockets of reduced vis 3-5SM in BLDU.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
A Gale Warning continues through 6 AM, followed by a Small Craft Advisory for the outer waters through 2 AM Tuesday. Gales and seas will be hazardous early this morning, and for the outer waters again this afternoon and evening. No additional marine hazards are expected Tuesday through Friday.
-- End Changed Discussion --
&& .BEACHES...
-- Changed Discussion --
A High Surf Advisory is in the effect for the San Diego County Beaches and a Beach Hazards Statement is in effect for Orange County through noon today. A large swell from the west-northwest will produce breaking waves 4 to 7 feet, up to 10 feet in San Diego County. Swell and surf will subside today.
-- End Changed Discussion --
&& .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
CA...High Surf Advisory until noon PDT today for San Diego County Coastal Areas. Beach Hazards Statement until noon PDT today for Orange County Coastal Areas. PZ...Gale Warning until 6 AM PDT early this morning for Coastal Waters from San Mateo Point to the Mexican Border and out to 30 nm-Waters from San Mateo Point to the Mexican Border Extending 30 to 60 nm out including San Clemente Island. Small Craft Advisory until 2 AM PDT Tuesday for Waters from San Mateo Point to the Mexican Border Extending 30 to 60 nm out including San Clemente Island.
-- End Changed Discussion --
&& $$ PUBLIC...17 AVIATION/MARINE/BEACHES...MM

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.