* WHAT...For the Heat Advisory, heat index values up to 105 expected. For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 110 expected. * WHERE...In Minnesota, Norman, Clay, Grant, West Otter Tail, and Wilkin Counties. In North Dakota, Cass, Richland, and Traill Counties. * WHEN...For the Heat Advisory, until 11 AM CDT this morning. For the Extreme Heat Warning, until 9 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.