* WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 112 degrees. Localized Major Heat Risk.
* WHERE...The lower Colorado River Valley, including the city of Yuma.
* WHEN...Until 8 PM MST /8 PM PDT/ Thursday.
* 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.