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

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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...After a day of very hot temperatures, low temperatures will remain elevated, in the lower to mid 70s for many locations. * WHERE...Portions of central and northern Utah. * WHEN...Until 6 AM MDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.