What to expect from upcoming winter weather

The Winter Storm Severity Index uses weather forecasts and other non-meteorological data to anticipate the impact of winter storms for the continental US. Here's the WSSI for the next three days.

Potential winter storm impacts

Limited
Minor
Moderate
Major
Extreme

Definitions: Limited: Winter weather. Drive carefully. Minor: A few inconveniences to daily life. Use caution while driving. Moderate: Disruptions to daily life. Hazardous driving conditions. Use extra caution. Closures and disruptions to infrastructure may occur. Major: Considerable disruptions to daily life. Dangerous or impossible driving conditions. Avoid travel. Widespread closures and disruptions to infrastructure may occur. Extreme: Substantial disruptions to daily life. Extremely dangerous or impossible driving conditions. Travel is not advised. Extensive and widespread closures and disruptions. Life-saving actions may be needed.

Source: NOAA Winter Storm Severity Index

Graphic: Byron Manley, Matt Stiles and Curt Merrill, CNN