6800ft. 
931 FXUS66 KSGX 150543 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 1043 PM PDT Mon Sep 14 2026 .SYNOPSIS... Subtle cooling will continue through the middle of the week as a troughing pattern remains over the West Coast with temperatures near to up to 10 degrees below average. This pattern will bring night and morning low clouds for areas west of the mountains with breezy winds across the desert slopes and deserts each day. Subtle warming is expected by later this week with temperatures rising back to near normal. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... ...UPDATED AVIATION DISCUSSION... A weak troughing pattern over the West will be reinforced with another shot of cooler air as another low pressure system moves southward Tuesday through Thursday. Pressure heights will continue fall, leading to a continued subtle cooling trend. Wednesday and Thursday will see the coolest temperatures of the week. There is a 75-100% chance of temperatures across the Inland Empire, Coachella Valley and the large High Desert cities staying below 90 degrees these days; plentiful 70s and 80s expected for areas along and west of the mountains. Low temperatures will also begin to cool off through the next few nights as well, with lows in the 50s and 60s along and west of the mountains and in the high desert. Increased sea breeze winds will be felt along the desert slopes and into the deserts each afternoon and evening through Thursday, some areas gusting over 35 MPH in the passes and High Desert. The low pressure system to the north will move out by Friday into the weekend. Models begin to diverge on what exact pressure systems move over the area, but consensus continues to shift toward whatever does form will be weak in nature. This will lead to temperatures staying near average for the latter part of the week with weaker winds across the mountains and deserts. && .AVIATION... 150600Z...Coast/Valleys...Low clouds based 1700-2000 feet MSL will gradually fill most of the coastal basin overnight. Vis reduced inland 2-5SM. Scatter out 16-18Z. Low clouds to push ashore after 03Z Tuesday eve and spread inland overnight again with bases around 1800-2200 feet MSL. Mountains/Deserts...Mostly clear and VFR conditions through Tuesday. && .MARINE... No hazardous marine conditions are expected through Saturday. && .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...APR AVIATION/MARINE...MM
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