The drills are planned to give emergency officials, residents, schools and businesses a chance to test and review emergency plans.
Snow showers will be possible across portions of the region late Wednesday afternoon into Wednesday evening.
A winter weather advisory is in effect for northern and central Indiana until 10:00 A.M. Friday.
Local police departments throughout the state will give away 8,500 radios.
The forecast calls for cooler than normal daytime highs today and tomorrow.
A thunderstorm watch remains in effect until midnight.
Damaging wind gusts will be the primary threat, with hail, brief heavy rainfall and dangerous lightning also possible.
Severe storms expected over parts of the Ohio Valley this afternoon.
More showers and thunderstorms will be possible tonight as a cold front approaches from the Great Lakes.
Students and staff followed tornado evacuation procedures during class at Indiana University today.