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The 2017 Farmers Almanac
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How are Hurricane Categories Determined?

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How are Hurricane Categories Determined?

(source FEMA)

Saffir-Simpson Hurricane Scale
Scale Number
(Category)
Sustained Winds
(MPH)
Damage Storm Surge
1 74-95 Minimal: Unanchored mobile homes, vegetation, and signs. 4-5 feet
2 96-110 Moderate: All mobile homes, roofs,
small crafts, flooding.
6-8 feet
3 111-130 Extensive: Small buildings, low-lying roads cut off. 9-12 feet
4 131-155 Extreme: Roofs destroyed, trees
down, roads cut off, mobile homes
destroyed. Beach homes flooded.
13-18 feet
5 More than 155 Catastrophic: Most buildings
destroyed. Vegetation destroyed.
Major roads cut off. Homes flooded.
Greater than 18 feet

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