A strong area of low pressure was located over the Ohio Valley on Wednesday, February 24th and the storm headed northeast towards the region. A warm front extended out of this storm, allowing for periods of rainfall during the day Wednesday, February 24th and into the evening hours. As the warm front passed through the region during the overnight hours, temperatures became quite mild for late February reaching into the 50s and 60s, despite it being in the middle of the night. In addition, thunderstorms ahead of the storm's cold front moved from the mid-Atlantic states up towards western Massachusetts.
The thunderstorms produced a period of very heavy rainfall during the late evening and into the overnight hours. Rainfall fell at rates exceeding one inch per hour at times. This rainfall, combined with a frozen ground in places and some snow melt in mountainous areas, allowed for widespread flooding of urban, poor drainage and low lying areas.
In addition, the narrow line of thunderstorms became severe over the northern Berkshires, producing damaging wind gusts. The strongest gusts occurred in the Williamstown area, downing several trees and damaging some homes.
The passage of the storm's cold front during the early morning hours of Thursday, February 25th ended the threat for severe thunderstorms and heavy rainfall. Some additional rainfall during the day on Thursday, February 25th allowed the receding of water of flooded areas to be slow to occur.