National Weather Service United States Department of Commerce

Dangerous heat is expected across the area on Tuesday with heat indices of 105 to 110° which has prompted the issuance of a Heat Advisory. This will greatly increase the risk of heat-related illnesses. It is important to drink plenty of water and limit activities outdoors during the afternoon when temperatures are at their highest.
Thunderstorms are likely late Tuesday evening through the overnight hours. Some strong to severe storms are possible, mainly along and north of I-70. The main threat is damaging wind gusts up to 60 mph, but one inch hail is also possible.
If you've got to do something outside this week, you might want to wait until it's not so hot. A cold front Tuesday night provides a couple days break from the more intense heat. We may also get some rain!
The Hannibal NOAA Weather Radio transmitter is currently down due to a telecomminications outage. Technicians are working to resolve the issue, but currently there is no estimated return to service date. At a minimum, the radio is not likely to be online until at least June 25th, but may be offline for longer.