The highest HeatRisk is expected to the coast and valleys for today and Wednesday with widespread Extreme HeatRisk for the mesas and into the western valleys in San Diego County. Cooling will begin to spread inland on Thursday and Friday. There will be greater drying for next weekend with cooler nights by next Sunday and Monday. A slight chance of showers and thunderstorms through Thursday, with the greater chances for the mountains each afternoon.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Thursday), High temperatures for the coast and valleys will peak today and Wednesday with cooling of high temperatures beginning to spread inland into the coast and valleys on Thursday. High temperatures on Wednesday will be as much as 10 to 15 degrees above average for the western valleys and inland coastal areas with high temperatures ranging from the 80s at the beaches to the upper 90s to 108 for the Inland Empire with the lower deserts around 110. Low temperatures for the coast and valleys will continue to be mostly in the 70s.
The greater chances for showers and thunderstorms for the next few days will be near the mountains and during the afternoons with the timing and coverage more focused on terrain and during the peak daytime heating. However, there could be more isolated coverage at other times and locations for the band of mid and high level moisture extending northeastward across the area from weakening Tropical Storm Marie.
Widespread Extreme HeatRisk is expected for today for the mesas into the western valleys in San Diego County with widespread Major HeatRisk for much of the rest of the coast and valleys through Wednesday except at some of the beaches.
(Friday through Monday), Cooling of high temperatures will begin to spread inland on Thursday and Friday with greater drying of the mid and high level moisture for next weekend. For next Sunday, high temperatures will cool to a few degrees below average to around 5 degrees below average for portions of the inland valleys. High temperatures for next Sunday will range from the 70s near the coast to the mid 80s to lower 90s for the Inland Empire with 100 to 104 for the lower deserts. For next Sunday and Monday, low temperatures for the inland valleys will be mostly in the 50s and for the coast into the western valleys mostly in the 60s.
081130z, VFR conditions expected across the region today and tonight. SCT to locally BKN clouds between 10-20 kft. CBs based at 9 kft MSL leading to isolated SHRA/TSRA over mountains with tops to 35 kft 19-01Z. Localized gusty winds in and near any TSRA.
No hazardous marine conditions are expected through Saturday.
A large south swell from Tropical Storm Marie will continue to produce large surf of 3 to 6 feet, with sets up to 8 feet today, highest on south and southwest facing beaches. This will result in strong rip and longshore currents, creating hazardous swimming conditions. Additionally, high tide this evening will combine with the high surf to produce minor tidal overflow, coastal flooding, and localized beach erosion. Swell and surf will gradually diminish today and tonight. Check the Coastal Hazard Message for details.
Ca, Coastal Flood Advisory until 11 PM PDT this evening for Orange County Coastal Areas-San Diego County Coastal Areas.
High Surf Advisory until 11 PM PDT this evening for Orange County Coastal Areas-San Diego County Coastal Areas.
Extreme Heat Warning until 8 PM PDT Wednesday for Orange County Coastal Areas-Orange County Inland Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Coastal Areas-San Diego County Valleys.
Heat Advisory from 8 PM Wednesday to 8 PM PDT Thursday for Orange County Coastal Areas-Orange County Inland Areas-San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Coastal Areas-San Diego County Valleys.
Heat Advisory from 10 AM this morning to 8 PM PDT Thursday for Riverside County Mountains-San Diego County Mountains.
Extreme Heat Warning from 10 AM Wednesday to 8 PM PDT Friday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, None.
