All throughout Monday morning, you've been hearing News 8 reporters and meteorologists using the word "thundersleet."
Thundersleet occurs when the conditions are right for thunderstorms, but temperatures at the surface are below freezing.
As rain falls to the ground, it falls through subfreezing air at the surface. This causes the rain to freeze into little balls forming sleet.
This sleet comes from a regular old thunderstorm, that's why it's accompanied with claps of thunder and flashes of lightning.
Heavy bursts are likely in these storms creating locally heavy amounts of sleet.