Monday 11 March 2013

Saffir–Simpson hurricane wind scale

The Saffir–Simpson hurricane wind scale is a 1 to 5 rating based on a hurricane's sustained wind speed. This wind scale estimates potential property damage. 
  
Saffir–Simpson hurricane wind scale
Category
Wind speeds
Damage
Five
≥252 km/h
catastrophic damage
Four
209–251 km/h
catastrophic damage
Three
178–208 km/h
devastating damage
Two
154–177 km/h
extensive damage
One
119–153 km/h
some damage










Category 1
Very dangerous winds will produce some damage
Well-constructed frame homes could have damage to roof, shingles, vinyl siding and gutters. Large branches of trees will snap and shallowly rooted trees may be toppled. Extensive damage to power lines and poles likely will result in power outages that could last a few to several days.


Category 2

Extremely dangerous winds will cause extensive damage
Well-constructed frame homes could sustain major roof and siding damage. Many shallowly rooted trees will be snapped or uprooted and block numerous roads. Near-total power loss is expected with outages that could last from several days to weeks.

Category 3

Devastating damage will occur: 
Well-built framed homes may incur major damage or removal of roof decking and gable ends. Many trees will be snapped or uprooted, blocking numerous roads. Electricity and water will be unavailable for several days to weeks after the storm passes.

Category 4
Catastrophic damage will occur: 

Well-built framed homes can sustain severe damage with loss of most of the roof structure and/or some exterior walls. Most trees will be snapped or uprooted and power poles downed. Fallen trees and power poles will isolate residential areas. Power outages will last weeks to possibly months. Most of the area will be uninhabitable for weeks or months.

Category 5

Catastrophic damage will occur: 
A high percentage of framed homes will be destroyed, with total roof failure and wall collapse. Fallen trees and power poles will isolate residential areas. Power outages will last for weeks to possibly months. Most of the area will be uninhabitable for weeks or months.