* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to 116. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.
* WHERE...Mostly rural portions of southwest Arizona and southeast California, including Joshua Tree National Park.
* WHEN...Until 8 PM MST /8 PM PDT/ Monday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.