Enhanced F-Scale for Tornado Damage
Meteorologists and engineers study the damage and debris left behind
after a tornado to determine its strength. The "Enhanced Fujita Scale"
is used to rank all wind events:
| EF Number | Wind Speeds |
| EF 5 | Over 200 mph |
| EF 4 | 166 - 200 mph |
| EF 3 | 136 - 165 mph |
| EF 2 | 111 - 135 mph |
| EF 1 | 86 - 110 mph |
| EF 0 | 65 - 85 mph |
Full documentation is available at http://www.spc.noaa.gov/faq/tornado/ef-ttu.pdf
Safety Rules
- Develop a severe weather disaster plan
- Perform frequent tornado drills
- Have a professional desginated tornado shelter areas
- Avoid areas with large roof spans or windows
- Have a method to alert employees of threatening weather
- Have a backup process too!
- Make provisions for employees with special needs