Pre-1949 Rating Technique

The Pre-1949 Rating Technique is a rating technique that is used for unrated tornadoes (F?-F4) in or before 1949. It is determined by the damage total and the causality toll, but majority is because of the damage described.

Use
Note: This is only used on the History of Tornadoes Wiki.

F?
If the property and crop damage is unknown, or the causality toll, the tornado will be assigned an F? rating. Almost little to no information is given about the tornado damage.

F0
If the property damage is from $0 to $5,000 in damages, the storm will be rated F0. At least three injuries could occur. Damage should be consistent with F0 tornadoes from 1950-2007.

F1
If property damage is from $5,000 to $10,000 in damages, the storm will be assigned an F1 rating. At least one fatality can occur. Damage should be consistent with F1 tornadoes from 1950-2007.

F2
If property damage is from $10,000 to $50,000 in damages, the storm will be assigned an F2 rating. At least five fatalities can occur. Damage should be consistent with F2 tornadoes from 1950-2007.

F3
If property damage is from $50,000 to $1 million in damages, the storm will be assigned an F3 rating. Five to ten fatalities can occur. Damage should be consistent with F3 tornadoes from 1950-2007.

F4
If property damage exceeds $1 million in damages, the storm will be assigned an F4 rating. 11 or more fatalities can occur. This is the final rating used in the technique. Damage should be consistent with F4 tornadoes from 1950-2007.