Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

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Last Map Update: Fri, Mar 20, 2026 at 8:26:17 am PDT

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

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National Weather Service Los Angeles, CA

Extreme Heat Warning

Heat Advisory

Small Craft Advisory

Central California Late Week Heat Risk

Western U.S. March Heat Key Messages

Cold Water Safety

Widespread Minor Heat Risk is expected for central California including the San Joaquin Valley and Mojave Desert on Friday and Saturday. This level of risk can result in heat-related illnesses for those extremely sensitive to heat such as older adults (65+), infants, those without effective cooling, and those with chronic diseases.

Streams and waterways will be rising and running cold and fast this week! As the temperatures become hotter this week, waterways may be inviting. However, the water will flow dangerously fast and cold. It is recommended to stay out of these waterways and streams, as this will cause adverse impacts to even the most experienced swimmers. Also heed instructions from law enforcement.

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Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

NWS Forecast Office Hanford, CA