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Heat Advisory

◍ Williamson · USA · updated 9/13/2026, 5:39:00 AM

⏱ In effect until 8:45 AM UTC-5

Severity score

65/100

Confidence

High

Why this matters

* WHAT...Heat index values up to 110 expected. * WHERE...The I-35 corridor and Coastal Plains. * WHEN...From noon today to 7 PM CDT This evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Key stats

Severity

Moderate

Certainty

Likely

Urgency

Expected

Timeline

Heat Advisory
9/13/2026, 5:39:00 AM
Heat Advisory issued September 13 at 12:39AM CDT until September 13 at 7:00PM CDT by NWS Austin/San Antonio TX

Sources & attribution

OfficialNWS NWS Austin/San Antonio TXupdated 9/13/2026, 5:39:00 AM

OfficialNWS NWS Norman OKupdated 9/13/2026, 5:26:00 AM

OfficialNWS NWS Houston/Galveston TXupdated 9/13/2026, 4:20:00 AM

OfficialNWS NWS Little Rock ARupdated 9/13/2026, 4:17:00 AM

OfficialNWS NWS Corpus Christi TXupdated 9/13/2026, 3:54:00 AM

OfficialNWS NWS Jackson MSupdated 9/13/2026, 3:41:00 AM

OfficialNWS NWS Tulsa OKupdated 9/12/2026, 5:13:00 PM

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