San Diego County Prepares for Prolonged Heat Wave and Potential Power Shutoffs

Key points

• Extreme Heat Warning issued for San Diego County from Friday, Oct. 1, through at least next Thursday, with highs in the 90s on the coast and 100s in inland valleys.
• SDG&E may activate Public Safety Power Shutoffs (PSPS) through Oct. 5 due to elevated wildfire risks from hot, dry, and windy conditions.
• The County of San Diego advises residents to charge devices, cool homes early, and visit 33 air-conditioned Cool Zones (libraries and community centers) if indoor temperatures become unsafe.
• Vulnerable groups, including older adults, children, and those with chronic conditions, are urged to stay hydrated, avoid outdoor activity during peak heat, and never leave pets or people in vehicles.
• Near the Tijuana River Valley, residents are advised to limit outdoor activity and use air conditioning on recirculate to reduce exposure to hydrogen sulfide odors, which increase during heat events.

Background

This event follows a mid-September extreme heat warning in San Diego County that saw temperatures 10-15 degrees above average. Broader regional concerns include a Lancet Planetary Health study highlighting increased heat exposure for older adults due to global warming, and recent heat-related collapses in Arizona. Additionally, neighboring Santa Barbara County recently implemented PSPS for 2,490 customers due to gusty winds and wildfire risks, illustrating the regional impact of these weather patterns.

How outlets are covering it

San Diego County News Center emphasizes local preparedness measures, including Cool Zones and PSPS readiness, while highlighting specific risks like hydrogen sulfide odors in the Tijuana River Valley. LAist focuses on the broader Southern California context, noting this may be the longest heat wave of the season, extending into the second week of October, and stresses the vulnerability of children and the elderly. Noozhawk provides a concrete example of PSPS implementation in Santa Barbara County, where 2,490 customers lost power due to windy conditions, underscoring the immediate risks of such measures. While all sources agree on the severity of the heat and the need for safety precautions, they differ in scope: San Diego County focuses on local actions, LAist on regional trends and vulnerable populations, and Noozhawk on the practical impact of power shutoffs in a neighboring county.

Why it matters

The extreme heat poses significant health risks, including heat exhaustion and heatstroke, particularly for vulnerable groups. The potential for PSPS could disrupt daily life and emergency services, while elevated wildfire risks threaten communities. Proactive measures, such as using Cool Zones and preparing for outages, are critical to mitigating these risks and ensuring public safety during a prolonged heat wave.

What to watch

Residents should monitor official alerts via AlertSanDiego.org, prepare for potential power outages by charging devices and cooling homes early, and utilize Cool Zones if indoor temperatures rise. SDG&E will provide updates on PSPS through its dashboard. The County will continue coordinating with public-safety partners and reaching out to vulnerable populations. Residents should also monitor weather conditions and fire advisories, as the heat wave is expected to last through next Thursday, with possible extensions.