National Weather Service United States Department of Commerce
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Last Map Update: Fri, Jul. 20, 2018 at 3:52:13 am PDT

National Weather Service San Francisco Bay Area, CANational Weather Service San Joaquin Valley, CANational Weather Service Las Vegas, NV
National Weather Service Honolulu, HIZoom

National Weather Service NWS Phoenix
National Weather Service Honolulu, HINational Weather Service San Diego, CANational Weather Service San Diego, CA

A surge of monsoonal moisture will continue to bring a threat of afternoon and evening showers and thunderstorms to portions of southwestern California through Friday. Isolated storms will be possible over interior portions of southwestern California, including the mountains of Los Angeles, Ventura, and Santa Barbara counties, and across the Antelope Valley, Cuyama Valley, and interior valleys of San Luis Obispo County. Any storms that do develop will be capable of producing brief heavy downpours with isolated flash flooding possible. In addition, strong and erratic wind gusts will be possible near thunderstorms. Please stay tuned to the latest National Weather Service statements and possible warnings, especially if participating in outdoor activities.
A long duration heat wave with record-breaking temperatures is possible next week for much of southwestern California as a strong upper level high pressure system expands westward from the desert southwest. There is the potential for high heat risk mainly for interior locations including the valleys and mountains Monday through at least Thursday, especially across Ventura and Los Angeles counties. It appears Wednesday will be the peak of the heat, when many interior locations could have the potential for very high heat risk. In addition to the possibility of several days of triple digit high temperatures, there is also the potential for very warm overnight low temperatures in the valleys, foothills and lower mountain elevations, which could exacerbate the overall heat risk. Sundowner winds will be possible for the Santa Barbara County south coast and Santa Ynez Mountains as well for several evenings next week, boosting temperatures there well into the 90s if not the century mark at times. The high heat will also result in elevated fire weather concerns across the region.


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