* WHAT...Extremely hot daytime temperatures combined with warm overnight lows 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 98 to 106 today through Wednesday. Overnight lows will remain well above normal providing only limited relief.