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Heat Advisory

◍ Marion · USA · updated 8/21/2026, 2:40:00 AM

⏱ In effect until 10:00 AM UTC-5

Severity score

65/100

Confidence

High

Why this matters

* WHAT...Heat index values up to 108. * WHERE...Fayette, Jefferson, Lamar, Marion, Shelby, and Walker Counties. * WHEN...Until 9 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Key stats

Severity

Moderate

Certainty

Likely

Urgency

Expected

Severity over time

Timeline

Heat Advisory
8/21/2026, 2:40:00 AM
Heat Advisory issued August 20 at 9:40PM CDT until August 21 at 9:00PM CDT by NWS Birmingham AL

Sources & attribution

OfficialNWS NWS Birmingham ALupdated 8/21/2026, 2:40:00 AM

OfficialNWS NWS Mobile ALupdated 8/21/2026, 12:34:00 AM

OfficialNWS NWS Tallahassee FLupdated 8/20/2026, 6:21:00 PM

OfficialNWS NWS Lake Charles LAupdated 8/20/2026, 5:54:00 PM

OfficialNWS NWS Amarillo TXupdated 8/20/2026, 5:33:00 PM

OfficialNWS NWS Pendleton ORupdated 8/20/2026, 5:30:00 PM

OfficialNWS NWS Spokane WAupdated 8/20/2026, 5:28:00 PM

OfficialNWS NWS Tulsa OKupdated 8/20/2026, 5:12:00 PM

OfficialNWS NWS Norman OKupdated 8/20/2026, 5:04:00 PM

OfficialNWS NWS Missoula MTupdated 8/20/2026, 4:25:00 PM

OfficialNWS NWS San Angelo TXupdated 8/20/2026, 4:16:00 PM

⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.