Winter weather is set to hit the U.S. this Thanksgiving holiday. 

Snow storms have already covered the Midwest. Hundreds of flights were cancelled from Denver's airport. 

And a record-breaking "bomb cyclone" hit the California-Oregon coast, bringing in heavy amounts of snow throughout the region. 

A "bomb cyclone" is when a storm's central barometric pressure drops at least 24 millibars in 24 hours. The lower the pressure, the more powerful the storm. 

The system could generate waves of up to 35 feet (11 meters), wind gusts of up to 75 mph (120 kph) and heavy snow in the mountains. 

In the Washington, D.C. area powerful, windy storms are expected during the holiday. The weather is wreaking havoc for those travelling this holiday.