Sweltering residents across the West headed for lakes and rivers on Thursday [6 Jul 2007], seeking relief from triple-digit temperatures expected to set records through at least Friday. Temperatures in part of the West were climbing so high that authorities warned residents of southern Nevada, southeastern California and northwestern Arizona that outdoor activities could be dangerous except during the cooler early morning hours. Phoenix reached 115 degrees [46.1 degrees Celsius]; Baker, Calif., reached 125 degrees [51.7 degrees Celsius].
Around Las Vegas — where temperatures reached 116 degrees [46.7 degrees Celsius] Thursday afternoon — transformers were overheating and causing electrical pole fires because of all the people switching on their air conditioners, said Scott Allison with the Clark County Fire Department.