Extreme Heat Warning: Santa Ana Mountains and Foothills Under Alert Until October 8

The National Weather Service in San Diego has issued an Extreme Heat Warning for the Santa Ana Mountains and Foothills, effective from October 1 at 1:12 PM PDT and lasting until October 8 at 8:00 PM PDT. The warning, issued by the NWS San Diego office, covers a week-long period of dangerously hot conditions in the mountainous and foothill regions of Southern California. An earlier heat advisory for the same area was set to expire at 8:57 PM on October 1, but the situation has escalated to a full Extreme Heat Warning.

According to the NWS San Diego, the warning indicates that temperatures are expected to reach levels that pose a significant risk to health, particularly for vulnerable populations such as the elderly, children, and those working outdoors. The Santa Ana Mountains and Foothills are known for their rugged terrain and limited access to cooling centers, making the prolonged heat especially hazardous. While specific temperature thresholds were not provided in the initial dispatch, extreme heat warnings typically are issued when the heat index is forecast to reach or exceed 105 degrees Fahrenheit for at least two hours.

The extended duration of this warning—spanning eight days—is unusual and underscores the severity of the heat event. Local authorities are urging residents to stay hydrated, avoid outdoor activities during peak hours, and check on neighbors and pets. The warning may be updated or extended as conditions evolve, and further advisories could be issued for surrounding areas. This event is part of a broader pattern of intensifying heat waves across the western United States, highlighting the growing impact of climate change on extreme weather.