* WHAT...Dangerously hot conditions expected, with highs around 100 possible for most central and southern Utah valleys and up to 110 for Lower Washington County and Glen Canyon Recreation Area.
* WHERE...Western Millard and Juab Counties, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah, Western Canyonlands, and Southwest Utah.
* WHEN...From noon Saturday to 6 AM MDT Monday.
* 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, except low 80s for lower Washington County, will provide little in the way of overnight relief.