Meteorologists use the Miller Classification to determine the track and severity of a nor'easter. The technique is named after J.E. Miller, who created the system in 1946. The Miller Classification classified storms into two categories: Type A and Type B. Type A storms form in the Gulf of Mexico or along the coast of Georgia or South Carolina, and cause heavy snow mainly to parts of the Mid-Atlantic, New England, and Atlantic Canada. Type B storms form from a parent low-pressure system over the Ohio Valley, which then undergoes a center reformation onto the Gulf Stream. These storms can bring a swath of wintry precipitation from the Great Plains and the Ohio River Valley to the Southeastern United States and New England.