Alpena under heat advisory

ALPENA — Much of Northeast Michigan is under a heat advisory until 9 p.m. today, according to the National Weather Service in Gaylord.

The heat index for Alpena was 99 degrees as of 2:30 p.m.

The heat index is a measure of how hot it feels when the relative humidity is factored in.

Today’s high heat index means that heat-related illnesses are possible.The National Weather Service is advising that people drink plenty of water, stay out of the sun, and check on their relatives and neighbors.