List of regional snowfall index category 4 winter storms

The regional snowfall index (RSI) is a system used by NOAA to assess the societal impacts of winter storms in the United States. The scale is a replacement for the Northeast snowfall impact scale (NESIS) system, which was used for winter storms just in the Northeastern United States; Regional Snowfall Index assesses winter storm impacts in the six easternmost regions of the United States instead of just the Northeast.

Source: Wikipedia — List of regional snowfall index category 4 winter storms (CC BY-SA 4.0)