Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
037 FXUS66 KSGX 131039 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 339 AM PDT Tue Aug 13 2024 .SYNOPSIS... Drying will continue into Thursday, followed by a gradual increase in monsoonal moisture peaking early next week with more afternoon clouds over the mountains. For the mountains and deserts, there will be a very slow warming trend into early next week. For the coast and valleys, there will be minor day to day changes in high temperatures through Saturday followed by a warming trend for Sunday through Tuesday of next week. Night and morning coastal low clouds will spread locally into the far western valleys late each night with the low clouds becoming patchier near the coast for early next week. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Thursday)... The precipitable water for the NKX sounding from late Monday afternoon had decreased to 1.3 inch with drying of the monsoonal moisture expected to continue into Thursday. Through Thursday, there will be minor day to day changes in high temperatures for the coast and valleys with a very slow warming trend for the mountains and deserts with minor day to day changes. Night and morning coastal low clouds will spread inland as far as the far western valleys at times late each night. && .LONG TERM (Friday through Monday)... There will be a gradual increase in monsoonal moisture for next weekend into early next week. Even with the increase in monsoonal moisture, NBM daily chances for measurable rainfall for Big Bear only increase to 12 percent for Monday and 13 percent for Tuesday. More clouds are expected over the mountains in the afternoons by early next week. A very slow warming trend will continue for the mountains and deserts with a warming trend for the coast and valleys for Sunday through Tuesday. Night and morning coastal low clouds will become patchier near the coast by early next week. && .AVIATION... 130900Z...Coast/Valleys...Patchy low clouds with bases 900-1200 ft MSL and tops to about 1400 ft MSL will continue to become more uniform tonight, spreading as far as 10-15 miles inland by 14Z. Local reduced vis to 3-5 SM expected over higher coastal terrain where low clouds intersect with the terrain. Clouds clearing to the beaches 15Z-18Z. Low clouds with bases 800-1100 ft MSL developing again Tue evening and moving into coastal sites around 04Z-07Z. Mountains/Deserts...Mostly clear with unrestricted VIS through Wed morning. && .MARINE... No hazardous marine conditions are expected through Thursday. && .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...17 AVIATION/MARINE...CSP