Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
155 FXUS66 KSGX 241126 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 426 AM PDT Mon Jun 24 2024 .SYNOPSIS... Gradually cooler for the coast and valleys into the middle of the week with slight cooling for the deserts for late in the week. There is a slight chance of showers and thunderstorms for the mountains into the high desert for this afternoon and early evening with lesser chances for Tuesday afternoon. Drier and warmer for next weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Wednesday)... High temperatures for the coast and valleys will cool a few to around 5 degrees each day for today and Tuesday with only slight additional cooling for Wednesday through Friday. Cooling for the deserts will be much less, only a few degrees with the relatively cooler days some time around Thursday and Friday and possibly Saturday. The convection on Sunday afternoon and early evening was mostly along convergence boundaries in the mountains and into the high desert. The same basic pattern will hold for today and Tuesday, but with decrease coverage and chances as moisture decreases. While there will continue to be few, if any, high temperature records tied or broken, there could once again be several records tied or broken for warmest daily minimum temperatures for today and again Tuesday. On Sunday, there were records broken for warmest minimum temperature for 11 locations with a tie at one more location. Some patchy night and morning low clouds may return some time around the middle of the week. && .LONG TERM (Thursday through Sunday)... Toward the end of the week, NBM has the greatest warming for the coast and valleys on Saturday and for the deserts on Sunday with the greatest spread in the high temperature guidance for the weekend into early next week for the valleys with narrower spread for the deserts. The Excessive Heat Warning for the deserts continues through Thursday. The slight decrease in Heat Risk for the lower deserts on Friday and Saturday is mostly due to drying of lower level moisture and resulting nights that aren`t quite as warm. && .AVIATION... 240845Z...Coast/Valleys...FEW-SCT clouds at/above 10,000 ft MSL and unrestricted vis through this evening. There is a 20-40 percent chance of low clouds with bases 1000 ft MSL or less developing along the San Diego County coast after 09Z Tue. Mountains/Deserts...There is a 15-20 percent chance of TSRA over the San Bernardino Mountains and portions of the high desert this afternoon, with CB bases near 10,000 ft MSL and tops to 25,000 ft MSL. Gusty outflow winds and reduced vis in RA VCTY TSRA. Otherwise FEW-SCT clouds at/above 10,000 ft MSL and unrestricted vis through Tue night. && .MARINE... No hazardous marine conditions are expected through Friday. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...Excessive Heat Warning until 8 PM PDT Thursday for Apple and Lucerne Valleys-Coachella Valley-San Diego County Deserts- San Gorgonio Pass Near Banning. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...SS