Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
169 FXUS66 KSGX 141010 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 310 AM PDT Wed Aug 14 2024 .SYNOPSIS... While an increase in monsoonal moisture for the weekend into early next week may bring some afternoon clouds to the mountains, daily chances for measurable rainfall for the mountains will remain at less than 10 percent for at least the next week. It will be slightly warmer through Thursday and Friday, a few degrees cooler on Saturday, then slowly warmer for Sunday into the middle of next week. Night and morning coastal low clouds will extend locally inland into coastal areas late each night. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Friday)... Low pressure systems will move inland to the north with high pressure aloft centered across northern Mexico. This will maintain drier southwest to west flow aloft across the area with slight warming through Thursday and Friday. Night and morning coastal low clouds will extend locally inland into coastal areas late each night. && .LONG TERM (Saturday through Tuesday)... A large low pressure system will be off the West Coast with high pressure centered over New Mexico and Texas and with generally southwest flow aloft over at least portions of southern California. While monsoonal moisture may increase some for the weekend into early next week, NBM daily chances for measurable precipitation in the mountains are now less than 10 percent each day, greatest at Big Bear on Wednesday at 7 percent. High temperatures on Saturday may be a few degrees cooler followed by a slow warming trend for Sunday into the middle of next week. && .AVIATION... 140900Z...Coast/Valleys...Low clouds have so far struggled to develop but are expected to increase in coverage through the early morning, moving inland up to 10 miles by 13Z-14Z. Bases expected at 700-1000 ft MSL with tops to around 1200 ft MSL. 60-70% chance for CIGs at coastal sites by 10Z-11Z this morning. Local vis reductions 3-5 miles on higher coastal terrain. Expect clearing to the beaches 15Z-16Z. Low clouds with similar bases look to be patchy and slow to form late this evening, moving ashore around 09Z-11Z Thu. Mountains/Deserts...Mostly clear with unrestricted VIS through Thursday morning. && .MARINE... No hazardous marine conditions are expected through Sunday. && .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