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Using the same scenario, we could apply a range of numeric scores to each factor based on available data and our perception of the importance of each factor (included in the decision instructions for the scale we use).  In this case, the Lamar tornado receives a score of 48:
 
High magnitude (2 points per magnitude level) 6 points for a probable maximum magnitude of Enhanced Fujita 3.
All year hazard (1 point per month)  3 points for the April-June season.
Duration (1 point first day, 1 point first week, 1 point per month) 8 points for the impact day and week plus 6 months to rebuild. Timeline short (10 points for 1 hour or less of warning, 5 points for 1 day or less, 3 points for seasonal, 1 point for others) 5 minutes or less of warning for 10 points. Location wide area (community wide 10 points, or 1 point for each 0.10 of the community that could be impacted) 10 points for possible community wide impact. Frequency annual (1 point for each .01 on a 100 year probability) 1 point for an event that could happen once every 100 years. Not predicted (10 points for no prediction, 5 points for generalized watch, 3 points for specific warning within 24-48 hours, 1 point for other prediction) 10 points for no specific predictions available.
Related hazards (5 points for each unique related hazard) 0 points.
Cascading effects (5 points for each unique cascading hazard) 0 points.