Extreme Heat Warning: Great Salt Lake Desert and Mountains; Tooele and Rush Valleys; Eastern Box Elder County; Northern Wasatch Front; Salt Lake Valley; Utah Valley; Cache Valley/Utah Portion; Wasatch Back; Western Uinta Basin; Eastern Juab/Millard Counties; Sanpete Valley; Sevier Valley; Castle Country; San Rafael Swell

extract

Extreme Heat Warning — Great Salt Lake Desert and Mountains; Tooele and Rush Valleys; Eastern Box Elder County; Northern Wasatch Front; Salt Lake Valley; Utah Valley; Cache Valley/Utah Portion; Wasatch Back; Western Uinta Basin; Eastern Juab/Millard Counties; Sanpete Valley; Sevier Valley; Castle Country; San Rafael Swell Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions with temperatures up to 107 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...Until 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, monthly, or even all-time high temperature records Sunday through Monday. Overnight lows in the lower to mid 70s for many valley locations will provide little in the way of overnight relief.