THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHERN ILLINOIS...SOUTHWEST INDIANA...WESTERN KENTUCKY AND SOUTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT A CHANCE OF THUNDERSTORMS TODAY INCLUDES A SLIGHT RISK OF SEVERE STORMS...MAINLY ACROSS THE NORTHERN HALF OF THE QUAD STATE. DAMAGING WINDS WILL BE THE PRIMARY SEVERE WEATHER HAZARD...WHILE LOCALLY HEAVY RAINFALL AND LIGHTNING WILL BE THE MOST COMMON THUNDERSTORM HAZARDS. THE HEAT INDEX THIS AFTERNOON WILL APPROACH OR EXCEED 100.