Expected

* WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 116. Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Chuckwalla Valley, Imperial Valley, and Palo Verde Valley. * WHEN...Until 8 PM MST /8 PM PDT/ Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to 113. Major Heat Risk. * WHERE...Buckeye/Avondale, Central Phoenix, Deer Valley, East Valley, North Phoenix/Glendale, Northwest Valley, Scottsdale/Paradise Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek. * WHEN...Until 8 PM MST Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat

* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to 113. Major Heat Risk. * WHERE...A portion of south central Arizona. * WHEN...Until 8 PM MST Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * ADDITIONAL DETAILS...In Maricopa County, Call 2-1-1 to find a free cooling center, transportation, water and more.

* WHAT...Dangerously hot conditions with temperatures up to 102 occurring. * WHERE...Carter, Custer, and Fallon. * WHEN...Until midnight MDT Monday Night. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

* WHAT...Dangerously hot conditions. High temperatures between 95 and 100 expected. * WHERE...Bears Paw Mountains and Southern Blaine and Fergus County below 4500ft. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat. * ADDITIONAL DETAILS...The hottest temperatures will occur in the Missouri River Breaks. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

* WHAT...Dangerously hot conditions with heat index values up to 109. * WHERE...Beaver County. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning

* WHAT...Dangerously hot conditions with heat index values around 110 degrees. * WHERE...Portions of central and west central Illinois. * WHEN...Until 9 PM CDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

* WHAT...Afternoon high temperatures between 105 and 110 degrees. Overnight low temperatures in the mid to upper 70s. * WHERE...Dawes County and Northern Sioux County. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Temperatures will remain unusually warm Saturday night, with overnight lows expected in the mid to upper 70s. Take extra precautions when outside. Drink plenty of fluids and wear

* WHAT...Hot daytime conditions with high temperatures between 100 and 108 common. Warm overnight conditions will bring less relief than usual. * WHERE...Antelope Valley. * WHEN...Until 8 PM PDT Monday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors. Drink plenty of fluids, stay in an air-conditioned room, stay out of

* WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...Portions of northwestern, south central, and southwestern South Dakota. * WHEN...Until 8 PM MDT /9 PM CDT/ this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.