🌡️
Heat Advisory
◍ San Bernardino and Riverside County Valleys-The Inland Empire · USA · updated 8/21/2026, 7:23:00 PM
⏱ In effect until 10:00 PM UTC-7
Severity score
65/100
Confidence
High
Why this matters
* WHAT...Temperatures 90 to 97 for Inland Orange County, 90 to 102 for inland San Diego County, 98 to 106 for the Inland Empire and 89 to 99 in the mountains. * WHERE...Orange County Inland Areas, Riverside County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Mountains, San Diego County Valleys, and Santa Ana Mountains and Foothills. * WHEN...From 10
Key stats
Severity
Moderate
Certainty
Likely
Urgency
Expected
Timeline
- Heat Advisory8/21/2026, 7:23:00 PMHeat Advisory issued August 21 at 12:23PM PDT until August 24 at 8:00PM PDT by NWS San Diego CA
Sources & attribution
OfficialNWS NWS San Diego CAupdated 8/21/2026, 7:23:00 PM
OfficialNWS NWS San Diego CAupdated 8/21/2026, 7:23:00 PM
OfficialNWS NWS Phoenix AZupdated 8/21/2026, 7:15:00 PM
OfficialNWS NWS Tulsa OKupdated 8/21/2026, 7:14:00 PM
OfficialNWS NWS Charleston SCupdated 8/21/2026, 6:09:00 PM
OfficialNWS NWS Charleston SCupdated 8/21/2026, 6:09:00 PM
OfficialNWS NWS Jackson MSupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Jackson MSupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Jackson MSupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Lubbock TXupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Jackson MSupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Jackson MSupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Lubbock TXupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Lubbock TXupdated 8/21/2026, 5:58:00 PM
OfficialNWS NWS Fort Worth TXupdated 8/21/2026, 5:51:00 PM
OfficialNWS NWS Fort Worth TXupdated 8/21/2026, 5:51:00 PM
OfficialNWS NWS Midland/Odessa TXupdated 8/21/2026, 5:44:00 PM
OfficialNWS NWS Amarillo TXupdated 8/21/2026, 5:42:00 PM
OfficialNWS NWS Amarillo TXupdated 8/21/2026, 5:42:00 PM
OfficialNWS NWS Little Rock ARupdated 8/21/2026, 5:21:00 PM
OfficialNWS NWS Norman OKupdated 8/21/2026, 5:09:00 PM
OfficialNWS NWS Norman OKupdated 8/21/2026, 5:09:00 PM
OfficialNWS NWS Norman OKupdated 8/21/2026, 5:09:00 PM
OfficialNWS NWS Lake Charles LAupdated 8/21/2026, 4:54:00 PM
OfficialNWS NWS Lake Charles LAupdated 8/21/2026, 4:54:00 PM
OfficialNWS NWS Shreveport LAupdated 8/21/2026, 4:21:00 PM
OfficialNWS NWS San Angelo TXupdated 8/21/2026, 4:19:00 PM
OfficialNWS NWS New Orleans LAupdated 8/21/2026, 3:50:00 PM
OfficialNWS NWS Tallahassee FLupdated 8/21/2026, 11:09:00 AM
OfficialNWS NWS Mobile ALupdated 8/21/2026, 10:11:00 AM
OfficialNWS NWS Pocatello IDupdated 8/21/2026, 8:01:00 AM
OfficialNWS NWS Wilmington NCupdated 8/21/2026, 6:12:00 AM
OfficialNWS NWS Miami FLupdated 8/21/2026, 5:15:00 AM
OfficialNWS NWS Missoula MTupdated 8/20/2026, 4:25:00 PM
⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.