Hurricane season 2022: What is the Saffir-Simpson intensity scale?
Tropical systems tracked by the National Hurricane Center will be classified as depressions, tropical storms and hurricanes based on their intensity.
The NHC will label a system a tropical depression when it has sustained winds below 38 mph but shows the characteristics of organization and rotation of a cyclone that could develop into a stronger storm. When it reaches 39 mph sustained winds, it is labeled a tropical storm.
It isn’t until sustained winds of 74 mph or greater are reached that a system will be named a hurricane. At that point, the NHC uses the Saffir-Simpson Hurricane Scale of intensity to categorize it on a scale of 1-5.
Category 1: Sustained winds between 74-95 mph. Examples of Category 1 hurricanes that hit Florida include Hurricane Erin in 1995 and Hurricane Irene in 1999.
The NHC states, “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: Sustained winds between 96-110 mph. Examples of Category 2 hurricanes that hit Florida include Hurricane Frances in 2004 and Hurricane Sally in 2020 (although its eyewall made landfall in Gulf Shores, Alabama).
The NHC states, “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: Sustained winds between 111-129 mph. Examples of Category 3 hurricanes that hit Florida include Hurricane Jeanne in 2004 and Hurricane Wilma in 2005.
The NHC states,” 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: Sustained winds between 130-156 mph. Examples of Category 4 hurricanes that hit Florida include Hurricane Charley in 2004 and Hurricane Irma in 2017.
The NHC states, “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: Sustained winds greater than 157 mph. Examples of Category 5 hurricanes that hit Florida include Hurricane Andrew in 1992 and Hurricane Michael in 2018.
The NHC states, “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.”
