* WHAT...Extremely hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress.
* WHERE...Portions of southeast Montana and north central Wyoming.
* WHEN...Until midnight MDT Wednesday Night.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.
* ADDITIONAL DETAILS...Dangerously hot conditions with temperatures of 104 to 112 today. Highs temperatures Monday through Wednesday will range from 100 to 105. Overnight lows will remain well above normal.