* WHAT...Dangerously hot and humid conditions. Afternoon temperatures 107 to 114. Major Heat Risk.
* WHERE...Yuma, La Paz, and Eastern Riverside Counties, including the Colorado River Valley.
* WHEN...Until 8 PM MST /8 PM PDT/ Friday.
* 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.