Extreme Heat Watch: Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt

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Extreme Heat Watch — Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot and humid conditions. High temperatures will be in the mid 90s to low 100s on Saturday and upper 90s to mid 100s on Sunday. Isolated highs near 110 degrees possible in the Yellowstone River Valley on Sunday. * WHERE...All of northeast Montana. * WHEN...From Saturday morning through late Sunday night. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Overnight temperatures will range from the upper 60s to mid 70s both Saturday night and Sunday night, providing little relief from the heat.