This index, from NOAA's National Weather Service, attempts to scale the impacts from winter weather, taking into account factors such as snowfall, accumulated snow on rooftops, ice accumulation, the potential for a flash freeze, and blowing snow. Not all factors are in play in a given winter storm.

The Weather Authority was tracking scattered thunderstorms Monday afternoon. Temperatures will peak in the upper 80s to low 90s, but with high humidity, it may feel closer to or just above 100°F. Skies remain intermittently cloudy, and isolated storms ...