The warming trend will continue today with high temperatures for Friday and Saturday a few degrees cooler. The flow across the area becomes southeasterly for Sunday into next week allowing for an influx of monsoonal moisture. For Sunday into the middle of next week, there will be a chance for showers and thunderstorms with the greater chances over the mountains and during the afternoon and early evening each day. Increasing humidity will result in warmer nights and higher HeatRisk by the middle of next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, UPDATED AVIATION DISCUSSION,
(today through Saturday), The warming trend will continue today with high temperatures for Friday and Saturday a few degrees cooler. There will be widespread major HeatRisk for the lower deserts today with widespread moderate HeatRisk for other inland areas.
High temperatures for today will be around average near the coast to 5 to 10 degrees above average for the mountains, deserts, and inland valleys. High temperatures for today will range from the 70s near the coast to the mid 90s to 104 for the Inland Empire with 113 to 117 for the lower deserts.
Night and morning coastal low clouds will spread into the far western valleys at times into the weekend.
(Sunday through Wednesday), As the center of strong high pressure moves to the northeast, the flow across the area will become southeasterly allowing for an influx of monsoonal moisture for late Saturday into Sunday with growing spread by the middle of next week as to what degree that greater moisture persists. There will be chances for showers and thunderstorms beginning on Sunday with the greater chances over the mountains and during the afternoon and early evening each day.
There will be warming of low temperatures with low temperatures mostly 5 to 10 degrees above average by Wednesday and Thursday of next week. For Wednesday and Thursday of next week, there could be low temperatures for the coast and valleys mostly in the upper 60s to mid 70s and in the lower deserts in the mid 80s to lower 90s.
Those warming low temperatures will result in higher HeatRisk for most areas with moderate or greater HeatRisk for most areas for Wednesday of next week except at higher elevations in the mountains and near the coast. There will be moderate to major HeatRisk for the lower deserts, the valleys, and inland Orange County.
090930z. Coast/Valleys, Low clouds with bases 800-1200 ft MSL have filled in coverage up to 20 miles inland. VIS 2-6SM along elevated coastal terrain and around the I-15 corridor in SD County. Clouds scatter out 16-18Z. VFR through the evening. Low clouds with similar bases (and similar VIS reductions in BR) form along the coast after 03z Fri, patchy initially, then filling in coverage gradually after 07z up to 20 miles inland.
.Mountains/Deserts, VFR conditions prevail through the TAF period.
No hazardous marine conditions are expected through Tuesday.
Astronomical high tides of 7.0-7.2 ft are forecast July 12-14. Higher than normal tides combined with a modest south swell (3 ft swell 14/15 seconds from 190 degrees) generating surf of 4-6 ft may result in areas of coastal flooding in low lying areas, boardwalks, beach parking lots, and beach adjacent streets during evening high tides.
Ca, Heat Advisory until 8 PM PDT Friday for Riverside County Mountains-San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains.
Extreme Heat Warning until 8 PM PDT Friday for Coachella Valley- San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, None.
