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    Update: Extreme heat warning for 5 Freeway through Grapevine until Monday evening
    • August 10, 2026

    5 Freeway through Grapevine is included in an updated extreme heat warning issued by the National Weather Service on Monday at 3:51 a.m. The warning is in effect until 8 p.m.

    The NWS Hanford CA informs, “High temperatures of 100 to 108 degrees and Major Heat Risk.”

    “Hot temperatures and limited overnight relief may cause heat illnesses,” the NWS said.

    The full list of affected locations includes:

    • 5 Freeway through Grapevine
    • Los Banos – Dos Palos
    • Merced – Madera – Mendota
    • Planada – Le Grand – Snelling
    • Coalinga – Avenal
    • West Side of Fresno/Kings Counties
    • Caruthers – San Joaquin – Selma
    • Fresno-Clovis
    • West Side Mountains South of 198
    • Buttonwillow – Lost Hills – I5
    • Delano-Wasco-Shafter
    • Hanford – Corcoran – Lemoore
    • Visalia – Porterville – Reedley
    • Bakersfield
    • Southeast San Joaquin Valley
    • South End San Joaquin Valley
    • Mariposa Madera Foothills
    • Fresno-Tulare Foothills
    • South End Sierra Foothills
    • Kern River Valley
    • Tehachapi
    • Frazier Mountain Communities
    • Buena Vista County

    Emergency alerts in Southern California

    For “considerable or catastrophic” hazards, emergency alerts will be sent to all enabled mobile phones in the area. To monitor lesser risk, residents are advised to sign up for county alert systems and to monitor agencies’ social media. How to sign up for alerts in your area:

    LA County

    Orange County

    Riverside County

    San Bernardino County

    Staying safe in high temperatures

    Safety tips from the Environmental Health and Safety office at UC Irvine:

    • Drink water: Drinking plenty of water frequently is vital for those exposed to heat. An individual may produce as much as 2 to 3 gallons of sweat per day. To replenish that fluid you should drink 3 to 4 cups of water every hour.
    • Take breaks: Taking breaks in a cool shaded area and allowing time for recovery from the heat during the day are effective ways to avoid heat-related illness.
    • Avoid some beverages: Avoid or limit the use of alcohol and caffeine during periods of extreme heat. Both dehydrate the body.
    • Stop and rest: If you start to feel symptoms such as nausea, dizziness, weakness or unusual fatigue, rest in a cool shaded area. If symptoms persist or worsen seek immediate medical attention.
    • Clothing: Whenever possible, wear clothing that provides protection from the sun but allows airflow to the body. Protect your head and shade your eyes when outdoors.
    • Be prepared: When in the heat be sure to pay extra attention to those you’re with and be sure you know how to call for medical attention.

    For information about cooling centers operated by Los Angeles, Orange, Riverside and San Bernardino counties, see https://ready.lacounty.gov/heat/, https://ocgov.com/cooling-centers, https://capriverside.org/cool-centers and DPH.

    For more local weather alerts, visit our Weather Advisory page

     Orange County Register 

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