Heat Advisory: Eastern Toole and Liberty; Hill County; Northern Blaine County; Southern High Plains; Eastern Pondera and Eastern Teton; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Gates of the Mountains; Helena Valley; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley

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Heat Advisory — Eastern Toole and Liberty; Hill County; Northern Blaine County; Southern High Plains; Eastern Pondera and Eastern Teton; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Gates of the Mountains; Helena Valley; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley Severity: Moderate. Certainty: Likely. * WHAT...Hot daytime temperatures of 90 to 98 degrees, with overnight temperatures of 60 to 70 degrees. * WHERE...Portions of central, north central, and southwest Montana. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Multiple days of hot temperatures may cause heat illnesses and cumulative heat stress.