It's in effect until seven o'clock Wednesday night.
Heat indices boosted by temps over 100 degrees are coming in between 105 and 115 degrees and above.
The heat index in Little Rock this afternoon reached 118 around three o'clock.
The only relief will come in the evening hours when overnight lows drop to the mid 70s.
The combination of hot temperatures and high humidity will combine to create a dangerous situation in which heat illnesses are possible.
Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening.
Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments.
The dangerous heat stress conditions will continue through the week until increased cloud cover could keep Thursday afternoon a bit cooler, but an excessive heat watch remains in effect for much of the state for Thursday.
Each year, a number of deaths happen nationwide when children are accidentally left in vehicles during the summer months. In the past dozen years, 450 children have died from hyperthermia after being left in or gaining access to cars. NEVER leave children or pets unattended in a vehicle NOT EVEN FOR A MINUTE and remember to BEAT THE HEAT..CHECK THE BACKSEAT.
Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency, call 911.