At 841 PM CDT, Doppler radar was tracking a strong thunderstorm 4 miles northwest of Warren, moving south at 10 mph. HAZARD. Wind gusts up to 50 mph and nickel size hail. SOURCE. Radar indicated. IMPACT. Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include. Altus, Blair, Martha, Friendship, Warren, and Altus Air Force Base.

At 831 PM CDT, Doppler radar was tracking a strong thunderstorm over Martha, moving south at 10 mph. HAZARD. Wind gusts of 40 mph and nickel size hail. SOURCE. Radar indicated. IMPACT. Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include. Altus, Blair, Olustee, Martha, Friendship, and Altus Air Force Base.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Canadian, Cleveland, Kingfisher, McClain, Oklahoma, and Blaine Counties. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 113. For the Heat Advisory, heat index values up to 109 expected. * WHERE. Portions of southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from 11 AM to 9 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 112. For the Heat Advisory, heat index values up to 109 expected. * WHERE. Grady, Caddo, Beckham, and Washita Counties. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from 11 AM to 9 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 470 IN EFFECT UNTIL 11 PM CDT THIS EVENING FOR THE FOLLOWING AREAS IN OKLAHOMA THIS WATCH INCLUDES 11 COUNTIES IN SOUTHEAST OKLAHOMA ATOKA BRYAN JOHNSTON MARSHALL IN SOUTHERN OKLAHOMA JEFFERSON LOVE IN SOUTHWEST OKLAHOMA COTTON GREER HARMON JACKSON TILLMAN IN TEXAS THIS WATCH INCLUDES 5 COUNTIES IN NORTHERN TEXAS CLAY FOARD HARDEMAN WICHITA WILBARGER THIS INCLUDES THE CITIES OF ALTUS, ATOKA, CROWELL, DURANT, FREDERICK, GRANITE, HENRIETTA, HOLLIS, KINGSTON, MADILL, MANGUM, MARIETTA, QUANAH, RINGLING, RYAN, SHEPPARD AFB, TEMPLE, THACKERVILLE, TISHOMINGO, VERNON, WALTERS, WAURIKA, AND WICHITA FALLS.

SEVERE THUNDERSTORM WATCH 470 REMAINS VALID UNTIL 11 PM CDT THIS EVENING FOR THE FOLLOWING AREAS IN OKLAHOMA THIS WATCH INCLUDES 9 COUNTIES IN SOUTHEAST OKLAHOMA BRYAN MARSHALL IN SOUTHERN OKLAHOMA JEFFERSON LOVE IN SOUTHWEST OKLAHOMA COTTON GREER HARMON JACKSON TILLMAN IN TEXAS THIS WATCH INCLUDES 5 COUNTIES IN NORTHERN TEXAS CLAY FOARD HARDEMAN WICHITA WILBARGER THIS INCLUDES THE CITIES OF ALTUS, CROWELL, DURANT, FREDERICK, GRANITE, HENRIETTA, HOLLIS, KINGSTON, MADILL, MANGUM, MARIETTA, QUANAH, RINGLING, RYAN, SHEPPARD AFB, TEMPLE, THACKERVILLE, VERNON, WALTERS, WAURIKA, AND WICHITA FALLS.