And to this list we can now add Polar Vortex, as areas across the Midwest and East Coast are becoming all too familiar with this frigid weather phenomenon.
A Polar Vortex is a whirlpool of freezing air and it descend upon various parts of the country today.
Those in Illinois, Michigan and Wisconsin are experiencing subzero temperatures and more than a foot of snow. They are being encouraged to remain inside.
"It's just a dangerous cold," National Weather Service meteorologist Butch Dye says, referring to places such as Fargo, North Dakota, where the forecast is for 32 degrees below zero.
Frostbite and hypothermia often set in quickly at 15 to 30 below zero.
The weather is wreaking havoc on travel, as well, with thousands of flights canceled yesterday through Chicago, St. Louis and Indianapolis.
Attractions such as the St. Louis Art Museum and St. Louis Zoo have been closed indefinitely, while the Indiana Supreme Court is closed and even southern states are bracing for record-low temperatures.
There are endless snow days around the country, but let's hope those happy kids are bundled up to the fullest extend while they sled and play around. It's seriously dangerous out there.