Extreme Heat Watch

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 106. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 108 possible.

* WHERE...In Maryland, Central and Eastern Allegany County. In West Virginia, Eastern Grant and Eastern Mineral Counties.

* WHEN...For the Extreme Heat Warning, until 8 PM EDT this evening. For the Extreme Heat Watch, from Thursday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.