* WHAT...Dangerously hot conditions with temperatures up to 105 possible for the valleys of northern Utah, including the Wasatch Front and Cache Valley. Highs around 100 possible for the mountain valleys of northern and central Utah, including the Wasatch Back, along Castle Country, the Uinta Basin, and the San Rafael Swell.
* WHERE...Portions of central and northern Utah.
* WHEN...From noon Saturday to 6 AM MDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.
* ADDITIONAL DETAILS...There is high confidence that temperatures will warm to values challenging daily and monthly high temperature records Saturday and Sunday afternoons as high pressure builds. Overnight lows in the lower to mid 70s for many valley locations will provide little in the way of overnight relief.