The National Weather Service will begin providing more detailed severe weather warnings in Minnesota beginning Monday. Forecasters say the more descriptive information is aimed at getting people to safety sooner when severe weather approaches. Tornado warnings will be issued based on three tiers of information. When a tornado is possible based on radar data, the warning will clearly communicate hazards and possible impact. When there’s substantial evidence of a large and dangerous tornado, the warning will include the potential for considerable damage and direct listeners to take shelter immediately. When a tornado carries the potential for devastating damage, the warning will include the word “catastrophic.” The expanded warnings have been tested in Kansas and Missouri, and will now be expanded to a dozen other states.