* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to 113. Major Heat Risk.
* WHERE...In Arizona, La Paz and Yuma counties. In California, Palo Verde Valley.
* WHEN...Until 8 PM MST this evening.
* 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.