Saffir-Simpson Scale

From Portage County Skywarn - KD8NHF
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Cat Baro Wind Storm Surge Damage
1 28.94 74-95 4-5' No real damage to buildings. Damage to un-anchored mobile homes, shrubs and trees. Some damage to poorly built signs.Some coastal flooding and minor pier damage.
2 28.50 96-110 6-8' Some damage to building roofs, doors and windows. Considerable damage to shrubs and trees with some trees blown down. Considerable damage to mobile homes, poorly built signs and piers. Small craft in un-protected anchorages may break moorings.
3 27.91 111-130 9-12' Some structural damage to small residences and utility buildings. Mobile homes and poorly built signs destroyed. Flooding near coast destroys smaller structures.
4 27.17 131-155 13-18' More extensive curtain wall failures with some complete roof structure failure on small residences. Shrubs and trees and all signs blown down. Major erosion of beach areas. Terrain may be flooded well inland. Massive evacuation of low areas up to 6 miles inland may be required.
5 27.16 >156 >18' Complete failure of roofs on residences and many commercial buildings. Some complete building failures with small buildings overturned or blown away. All shrubs, trees and signs blown down. Flooding causes major damage to all structures near the shoreline. Massive evacuation from low ground within 5-10 miles of the shoreline may be required.

Courtesy of the National Weather Service