Extreme Heat Warning issued September 10 at 7:35PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
The National Weather Service in San Diego issued multiple extreme heat warnings for areas in Southern California on September 8. The warnings covered the Inland Empire valleys and the Santa Ana Mountains and Foothills, with alerts extending into September 9. These warnings alert the public to dangerously high temperatures in the region.

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2 developments- Sep 6Extreme Heat Warning issued September 8 at 7:01AM PDT until September 9 at 8:00PM PDT by NWS San Diego CA
- Sep 8Extreme Heat Warning issued September 11 at 2:30AM PDT until September 11 at 8:00PM PDT by NWS San Diego CA
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Quiet for 20 daysLast development · Sep 8 — Extreme Heat Warning issued September 11 at 2:30AM PDT until September 11 at 8:00PM PDT by NWS San Diego CA
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4 viewpointsHeat Advisory issued September 11 at 7:51PM PDT until September 11 at 8:00PM PDT by NWS San Diego CA
Heat Advisory issued September 11 at 12:50PM PDT until September 11 at 8:00PM PDT by NWS San Diego CA
Extreme Heat Warning issued September 11 at 12:03PM MST until September 11 at 8:00PM MST by NWS Phoenix AZ
Heat Advisory issued September 11 at 7:23AM PDT until September 11 at 6:00PM PDT by NWS Los Angeles/Oxnard CA
Heat Advisory issued September 11 at 6:57AM PDT until September 11 at 6:00PM PDT by NWS Los Angeles/Oxnard CA
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