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Hurricane Categories and Likely Effects (wind speeds are 1-minute averages) (USACE, CEM Table II-2-2 & Table IV-1-4)
Category Pressure mb Winds mph Winds kts Winds m/s Surge ft H ft T sec Effects

Depression

<39

<34

<17

3-13

4-8

Tropical Storm

39-73

34-63

17-32

16-26

5-9

Hurricane 1

> 980

74-95

64-82

33-42

4-5

13-26

7-11

Damage to unanchored shrubbery, and trees. Coastal road flooding and minor pier damage.

Hurricane 2

965-980

96-110

83-96

43-49

6-8

20-33

9-12

Damage to roofs, doors, windows, vegetation and piers. Small craft break moorings.

Hurricane 3

945-965

111-130

97-113

50-58

9-12

13-40

11-13

Structural damage to small  buildings.  Flooding near the coast destroys smaller structures. Larger structures damaged by floating debris. Inland flooding.

Hurricane 4

920-945

131-155

114-135

59-69

13-18

33-46

12-15

Complete roof failure on homes, major erosion of beach areas, major damage to lower floors of structures near the shore. Inland flooding.

Hurricane 5

< 920

> 155

>135

>69

> 18

40-56

13-17

Complete roof failure homes and industrial buildings, complete building failures, major damage to lower floors of all structures near the shoreline. Massive evacuation of residential areas.

 

Online Data Resources

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