EM 1110-2-1100 (Part II)
30 Apr 02
Figure II-8-9. Extreme fastest-mile hurricane wind speeds blowing from any direction at 10 m above
ground in open terrain near the coastline for various return periods (after National Bureau of Standards
(1980))
Table II-8-6
Return Period Adjustment Factor
Adjustment Factor
Return Period, years
Other Regions
Hurricane Region (Gulf & Atlantic)
25
0.95
1.00
50
1.00
1.05
100
1.07
1.11
Table II-8-7
Conversion of Extreme Wind Speeds from Fastest-Mile to 1-hr Average
Conversion Factor1
Fastest Mile U, mph
U1hr , mph
50
41.0
0.82
80
62.4
0.78
100
77.0
0.77
120
91.2
0.76
150
111.0
0.74
1
U1hr = (factor) (fastest mile U)
Hydrodynamic Analysis and Design Conditions
II-8-19
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