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CALWIRE Weather Roundup (Tuesday, July 21, 2026)
By Cal Wire Weather Desk
EXTREME HEAT WATCH — Kofa
Extreme Heat Watch issued July 21 at 1:24AM MST until July 27 at 8:00PM MST by NWS Phoenix AZ
EXTREME HEAT WATCH — Lake Havasu and Fort Mohave
Extreme Heat Watch issued July 21 at 12:28AM PDT until July 27 at 8:00PM PDT by NWS Las Vegas NV
EXTREME HEAT WATCH — Antelope Valley
Extreme Heat Watch issued July 21 at 12:11AM PDT until July 27 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
EXTREME HEAT WATCH — Santa Clarita Valley
Extreme Heat Watch issued July 21 at 12:11AM PDT until July 27 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
EXTREME HEAT WATCH — Apple and Lucerne Valleys
Extreme Heat Watch issued July 21 at 3:02AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA
HEAT ADVISORY — San Bernardino and Riverside County Valleys-The Inland Empire
Heat Advisory issued July 21 at 3:02AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WATCH — Coachella Valley
Extreme Heat Watch issued July 21 at 3:02AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA
HEAT ADVISORY — San Bernardino County Mountains
Heat Advisory issued July 21 at 3:02AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA
HEAT ADVISORY — San Diego County Inland Valleys
Heat Advisory issued July 21 at 3:02AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WATCH — Parker Valley
Extreme Heat Watch issued July 21 at 1:24AM MST until July 27 at 8:00PM MST by NWS Phoenix AZ
HEAT ADVISORY — Santa Barbara County Southwestern Coast
Heat Advisory issued July 21 at 12:11AM PDT until July 23 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
HEAT ADVISORY — Santa Clarita Valley
Heat Advisory issued July 21 at 12:11AM PDT until July 22 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
HEAT ADVISORY — Cuyama Valley
Heat Advisory issued July 21 at 12:11AM PDT until July 27 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
HEAT ADVISORY — Los Angeles County Inland Coast including Downtown Los Angeles
Heat Advisory issued July 21 at 12:11AM PDT until July 27 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
FLOOD WATCH — Greater Lake Tahoe Area
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