A tornado warning that carries with it a "tornado emergency" is the rarest and is reserved for the most dire situations. This is only issued "when there is a severe threat to human life and catastrophic damage from an imminent or ongoing tornado", the NWS says.

It is important to know the difference between a Tornado Watch and a Tornado Warning. The National Weather Service explains the difference between the two below: Tornadoes are possible in and near the watch area.

It all suggests Trump is focused on somehow expanding the U.S. on his watch, though it’s hard to tell how serious it all… People have strong opinions on the "underwear vs. commando" argument when it comes to how we sleep.