* WHAT...Dangerously hot conditions with high temperatures and heat index values around 100 to 110 degrees. * WHERE...All of western and central North Dakota including the James River Valley. * WHEN...Until 1 AM CDT /midnight MDT/ Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Low temperatures will only fall into the 70s tonight, providing little relief from the heat.