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F2/F3: Empty one was light and acted as a sail.
none: Can't rate grain bins. Fujita scale does not apply.
F2: Grain bins damaged severely with those filled; however, nearly empty bin removed from bolted foundation.
F1: Grain bin damage usually occurs with winds.
F3: Grain bins toppled, yet trees still intact.
F2: Thicker metal, but tin.
F1: Older bins tend to be weaker at seams due to contraction over the years from the cycle of being filled and emptied, and heating and cooling.
F3: Because the tornado was really just rotating scud.
F2: Nearby trees still standing.
F2: Seen a lot of 80-100 mph wind do this to grain bins, center pivots, metal sheds, etc.
F3: Taken off bolts.
F4: Grain elevator gone, tied down, trees stripped.
F1: Would be F0 -- only the empty and near-empty bins gone -- but was anchored.
F3: Leaves gone, approximately 100 mph.
F3: Cylindrical elevator gone -- mass builds pressure. Trees snapped.
F3: A lot of trees standing.
F2: Smallish grain bin & anchoring in question.
F2: Large, empty grain bin does not need much to move.
F2/F3: Only a guess.
F2: Very high profile & low wind load rating.
F1: Full bin intact.
F2: Grain bins that had some grain in them were still standing.
F1: Corrugated metal implies a good sail.
F2: More bolts pulled through, but bigger structure & mostly empty.
F1: Large object, catches large volume of wind, typically not anchored sufficiently for size, wood sill plates typically rotted unless new.
F2: Elevator little damage.
F0: Have had grain bins moved off foundation with 55-65 mph winds!
F2: Hollow grain bin = "light missile"
F3: A guess.
F3: An empty grain bin is analogous to a typical house in the area.
F3: Why not?
AUDIENCE DAMAGE RATING STATISTICS FOR THIS SCENE:
Lubbock Scene 4 Sample Size 62 Min F Scale: 1 Max F Scale: 4 # F Scales: 4 Mean F Scale 2.15625 Standard Dev- iation of F: 0.7948811 Norman Scene 4 Sample Size 104 Min F Scale: 0 Max F Scale: 4 # F Scales: 5 Mean F Scale 2.043269 Standard Dev- iation of F: 0.7948811 St. Louis Scene 4 Sample Size 27 Min F Scale: 1 Max F Scale: 3 # F Scales: 3 Mean F Scale 1.925926 Standard Dev- iation of F: 0.67516