Map Shows Where California Residents Have Been Warned Not to Go Outside

Newsweek

29-05-2025

Based on facts, either observed and verified firsthand by the reporter, or reported and verified from knowledgeable sources.
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The National Weather Service (NWS) has warned residents across California to avoid going outdoors this weekend as temperatures in several regions are forecast to rise above 100 degrees Fahrenheit.
Why It Matters
Heat advisories were issued by the NWS for broad areas of Northwest, North Central, and South Central California.
High daytime temperatures, combined with limited relief overnight, can lead to heat-related illnesses, particularly for individuals lacking air conditioning, children, the elderly, and those who work outdoors, the service cautioned.
What To Know
The NWS forecast office in Sacramento warned of "dangerously hot" conditions, with temperatures up to 107 expected in the Sacramento Valley and nearby areas. It warned that heat related illnesses increase significantly during extreme heat events.
A map issued by NWS Sacramento highlights areas of concern due to dangerous heat.
A map issued by NWS Sacramento highlights areas of concern due to dangerous heat.
National Weather Service
In central California, including the cities of Merced, Bakersfield, and Tulare, high temperatures up to 106 were expected. Trinity, Mendocino, and Lake Counties could see highs of up to 105.
Meanwhile, the Cuyama Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, and Southern Salinas Valley were expected to see temperatures up to 100.
"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," the NWS said.
The NWS advised residents in affected areas to use added caution outdoors and to dress in lightweight, loose-fitting clothes. It also said to limit strenuous activities to early morning or evening.
"Take action when you see symptoms of heat exhaustion and heat stroke," it added.
Emergency services in some areas are preparing for a possible rise in heat-related ER visits, and health experts advised monitoring for early signs of heat exhaustion—such as dizziness, nausea and heavy sweating.
What People Are Saying
AccuWeather meteorologist Heather Zehr said, in an advisory shared with Newsweek: "This will be the first heat wave of the season in the West, outside of Southern California. A strong area of high pressure in the upper levels of the atmosphere will bring plenty of warmth."
NWS Sacramento said on X: "A Heat Advisory remains in effect from 11 a.m. Friday to 11 p.m. Saturday with widespread Moderate to Major HeatRisk forecasted and limited overnight relief."
NWS Los Angeles said on X: "Heat will return to SoCal Thu-Sat with Fri likely the warmest day:
"Heat Advisories Fri for interior San Luis Obispo & Santa Barbara counties.
"Increased risk of grass fires due to warm conditions, low humidity and gusty onshore winds valleys/mountains and deserts."
NWS Hanford said on X: "With 100°+ heat anticipated for the weekend, keep in mind that area lakes and rivers are still running cold, and in some cases, may have a 30° difference between air and water temperature. Warm air temperatures do NOT mean warm water temperatures!"
Dr. Gregory Hartt, the ER medical director at Mercy Medical Center Redding, previously told Newsweek: "As temperatures climb, we anticipate a corresponding increase in ER visits due to heat-related illnesses. A critical component of heat wave preparedness is proactively ensuring adequate staffing levels, supplies, and cooling measures are in place to effectively manage the influx of patients."
What Happens Next
At the time of writing, the latest of the heat advisories was in effect until Sunday morning.