1. Module 2 Case study 2 EF4 Strong Tornado Case Hallam, Nebraska Brian E. Smith National Weather Service Valley, NE

3. Aerial Photo over Hallam. 1 1 2 2 3 3 4 4 5 5

4. One or Two Family Residence DODs 1 2 3 4 5 6 7 8 9 10 Return to the aerial photo

5. Metal Building System DODs 1 2 3 4 5 6 7 8 Return to the aerial photo

6. Manufactured Home Single Wide DODs 1 2 3 4 5 6 7 8 9 Mobile Home Frame Return to the aerial photo

7. One or Two Family Residence

8. DODs 1 2 3 4 5 6 7 8 9 10 Return to the aerial photo

9. Hardwood Trees

10. DODs 1 2 3 4 5 Return to the aerial photo

11. One or Two Family Residences

12. DODs 1 2 3 4 5 6 7 8 9 10 Return to the aerial photo

13. One or Two Family Residences

14. Closeup of the Home DODs 1 2 3 4 5 6 7 8 9 10

15. Norris School

16. Junior or Senior High School Roof off classrooms Large Span Roofs Collapsed

17. Junior or Senior High School DODs 1 2 3 4 5 6 7 8 9 10 11

18. Summary Case Study of the Tornado that struck Hallam, Nebraska on May 22, 2004 Identify the Appropriate Damage Indicator Assess the Degree of Damage Assign a final EF Scale Rating (EF4) Identify Construction Quality variances and adjust DOD or wind speeds accordingly

19. Additional Information Storms Prediction Center EF-Scale Website: www.spc.noaa.gov/efscale Texas Tech Wind Science Engineering Center: www.wind.ttu.edu/EFScale.pdf