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Module 2Case study 2
EF4 Strong Tornado Case
Hallam, Nebraska
Brian E. Smith
National Weather Service
Valley, NE
Aerial Photo over
Hallam.
11
22
33
4 4
5 5
One or Two Family Residence• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9• 10
Return to the aerial photo
Metal Building System• DODs• 1• 2• 3• 4• 5• 6• 7• 8
Return to the aerial photo
Manufactured Home Single Wide
• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9
Mobile Home FrameMobile Home Frame
Return to the aerial photo
One or Two Family Residence
One or Two Family Residence• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9• 10
Return to the aerial photo
Hardwood Trees
Hardwood Trees
• DODs
• 1
• 2
• 3
• 4
• 5
Return to the aerial photo
One or Two Family Residences
One or Two Family Residences
• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9• 10
Return to the aerial photo
One or Two Family Residences
Closeup of the Home• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9• 10
Norris School
Junior or Senior High School
Roof off classrooms
Large Span Roofs Collapsed
Junior or Senior High School
• DODs• 1• 2• 3• 4• 5• 6• 7• 8• 9• 10• 11
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
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