The number of tornadoes per month in the US (1954-2009), normalized to constant 1997 values using linear regression.
The number of F1+ tornadoes per month in the US (1954-2012)
2x2 contingency tables for SPC Day 1 (12Z) convective outlooks from 1973-2010. First column is year, next four columns are slight risk and final four are for moderate risk. SPC Outlooks
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