Interactive station-level snowfall maps for 13 major storms with NOAA RSI data.
Circle size and color represent snowfall depth — larger & darker = more snow.
The NOAA Regional Snowfall Index categorizes snowstorms based on their societal impacts across populated areas.
RSI data includes ground-truth snowfall measurements from CoCoRaHS observers, NWS cooperative stations,
and trained weather spotters across the region. Each dot on the map represents a reporting station
with confirmed snowfall. Circle radius scales with snowfall amount
and color deepens from light blue → indigo → violet as totals climb.
Cyan ★ markers indicate the four ASOS airports included in this analysis.
RSI data coverage: 13 storms from January 2000 through March 2018.