* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to 116. Major Heat Risk.
* WHERE...Chuckwalla Mountains, Salton Sea, Chiriaco Summit, and Joshua Tree NP East.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.