During Extreme Heat: Find air conditioning. Avoid strenuous activities. Wear light clothing. Check on family members and neighbors. Drink plenty of water. Watch for heat cramps, exhaustion, and stroke. Never leave people or pets in a closed car.

Date: Wednesday, August 19, 2026

Air Pollutant(s): Ozone (O3)

For more information, visit: https://tulsaairquality.com/ozone-alert-program-old/ozone-health-advisories/

Dangerous heat will persist for all of eastern Oklahoma and western Arkansas on Wednesday, with heat index values in excess of 110 F expected across most of eastern Oklahoma and west central Arkansas this afternoon. Little nighttime relief is expected either. Heat stress will remain high during this period.

Isolated to scattered thunderstorms are expected to develop by late this afternoon or early this evening across far northeast Oklahoma and far northwest Arkansas. Locally strong to severe downburst winds and large hail up to half-dollar size will be the main threats with storms that develop.

Dangerously hot conditions will persist in parts of the area Thursday, with slight relief in areas north of I-40. An Extreme Heat Warning is in effect for far southeast OK from 1PM to 8 PM Thursday, and a Heat Advisory is in effect for east central OK and west central AR.

High heat stress conditions will persist and will continue to impact outdoor activities. Some minor heat relief is forecast on Thursday and Friday. Dangerous heat returns this weekend into next week.

Hot temperatures continue, with isolated to scattered thunderstorm potential tonight into Thursday morning. Slightly cooler for some on Thursday and into Friday, but back to the hot weather by this upcoming weekend.

Tulsa, Fort Smith and Fayetteville are all in the midst of a multi-day stretch featuring triple digit high temperatures with more forecast. How does the current stretch of 100's stack up all-time? Fayetteville has officially cracked the Top 5 as of August 16th and Fort Smith is within striking distance.