* WHAT...Extremely hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress.
* WHERE...Portions of central and south central Montana.
* WHEN...Until midnight MDT Monday Night.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.
* ADDITIONAL DETAILS...Dangerously hot conditions with high temperatures of 104 to 112 today. Temperatures will cool slightly to 95 to 101 Monday.