Hurricane Michael by the numbers: Storm is third strongest by pressure, fourth by wind speed in continental U.S.

Hurricane Michael made history as it moved onshore in the Florida Panhandle. With winds of 155 mph, the Category 4 storm is now the fourth strongest storm (according to wind speed) to make landfall in the continental United States since records began in 1851.

At a pressure of 919 millibars, Michael ranks as the third strongest storm (according to pressure) to make landfall in the continental United States. The lower the pressure, the stronger the storm.

The strongest storm to ever make landfall was in 1935 dubbed the "Labor Day" storm with a pressure of 892 millibars.

This storm is unprecedented as a Category 4 storm has never made landfall in the Florida Panhandle before Michael.

Why Hurricane Michael grew so quickly:

The main factor for Michael's quick intensification was the warm waters in the Gulf of Mexico. Hurricanes thrive off of ocean waters that are warmer than 80 degrees Fahrenheit and the Gulf is currently above that.

Also contributing to Michael's strength were the winds. Storms fall apart in environments with high wind shear, where the winds change direction and speed as you go up in altitude.

Michael was in an area with very low shear, favoring its rapid development.