Extreme Heat Watch

* WHAT...For the Heat Advisory, heat index values up to 100 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 104 possible.

* WHERE...Arenac and Gladwin Counties.

* WHEN...For the Heat Advisory, until 8 AM EDT Tuesday. For the Extreme Heat Watch, from Tuesday afternoon through Tuesday evening.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.