The TOR:CON Index
from Dr. Greg Forbes' Facebook Page

Severe Weather Expert, Dr. Greg Forbes developed the TOR:CON index to estimate the risk of a tornado on a given day or night near your area.

The TOR:CON index ranges from 0 to 10. Multiply the value by 10 to get your percentage chance of a tornado within 50 miles of a location. For example, a TOR:CON index of 6 means there's a 60% chance of a tornado within 50 miles of any location in the indicated area.

Note: By definition, a severe thunderstorm contains one or more of the following: hail at least 1 inch in diameter, wind gusts 58 mph or higher, or a tornado.

TOR:CON Value Descriptions

8+
Very high probability of a tornado
6 
High probability of a tornado
4 
Moderate chance of a tornado nearby, but hail and/or high wind gusts possible
2 
Low chance of a tornado, but hail and/or high wind gusts possible
0 
Near-zero chance of a tornado or a severe thunderstorm
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