National Weather Service officials have issued a health warning for inland residents as Southern California braces for a sweltering week ahead. With a Heat Advisory from 10 AM Tuesday to 8 PM PDT Wednesday for several valleys, including the Inland Empire and San Diego County Valleys, locals are advised to prepare for extreme temperatures. Inland valleys are expected to see highs ranging from 100 to 108 degrees, around 15 to 20 degrees above average for this time of year, reported National Weather Service San Diego, CA.
An Excessive Heat Warning is also in place from 10 AM Tuesday to 9 PM PDT Thursday for the Coachella Valley and San Diego County Deserts. The mountains' elevation from 4500 to 7000 feet is anticipated to hit the upper 70s to lower 90s, while the lower deserts could spike to 110 to 115 degrees. Residents struggle to stay calm amid these increasing temperatures as night and morning coastal low clouds and fog are expected to limit relief in the evening.
Early morning commuters experienced limited visibility, as NWS San Diego posted on its X account, warning drivers of dense fog around the I-15 corridor in San Diego Co. and the I-15 corridor in San Diego & Orange counties. Motorists were urged to allow extra time for travel and to keep a safe distance from other vehicles, with visibility reduced to a quarter mile or less in some areas.
6:15 AM: There is a lot of dense fog around the I-15 corridor in San Diego Co. and the I-5 corridor in San Diego & Orange counties. Areas of visibility at or below a quarter mile. Please allow yourself extra time this morning & leave plenty of room between you & the car in front!
— NWS San Diego (@NWSSanDiego) September 30, 2024
While high pressure keeps the coast slightly cooler, a shallow marine layer will persist, leading to night and morning coastal low clouds extending inland, with patchy dense fog for the mesas and other higher coastal terrain. The NWS San Diego also mentioned smoke and haze areas resulting from the ongoing Line Fire in the San Bernardino Mountains, which will affect visibility for commuters and pose additional challenges for those already dealing with the adverse weather conditions.
