Categories of Hurricanes

The Saffir-Simpson Hurricane Scale Includes Five Levels of Hurricanes

Warnings In Caribbean for Tropical Storm Chris
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The Saffir-Simpson Hurricane Scale sets categories for the relative strength of hurricanes that may impact the United States based on the sustained wind speed. The scale places them into one of five categories. Since the 1990s, only wind speed has been used to categorize hurricanes.

Another measurement is the barometric pressure, which is the weight of the atmosphere on any given surface. Falling pressure indicates a storm, while rising pressure usually means the weather is improving. 

Category 1 Hurricane

A hurricane labeled Category 1 has a maximum sustained wind speed of 74–95 mph, making it the weakest category. When the sustained wind speed drops below 74 mph, the storm is downgraded from a hurricane to a tropical storm.

Although weak by hurricane standards, a Category 1 hurricane's winds are dangerous and will cause damage. Such damage could include:

  • Roof, gutter, and siding damage to framed homes
  • Downed power lines
  • Snapped tree branches and uprooted trees

Coastal storm surge reaches 3–5 feet and the barometric pressure is approximately 980 millibars.

Examples of Category 1 hurricanes include Hurricane Lili in 2002 in Louisiana and Hurricane Gaston, which hit South Carolina in 2004.

Category 2 Hurricane

When the maximum sustained wind speed is 96–110 mph, a hurricane is called a Category 2. The winds are considered extremely dangerous and will cause extensive damage, such as:

  • Major roof and siding damage to framed homes
  • Major power outages that could last days to weeks
  • Many uprooted trees and blocked roads

Coastal storm surge reaches 6–8 feet and the barometric pressure is approximately 979–965 millibars.

Hurricane Arthur, which hit North Carolina in 2014, was a Category 2 hurricane.

Category 3 Hurricane

Category 3 and above are considered major hurricanes. The maximum sustained wind speed is 111–129 mph. Damage from this category of hurricane is devastating:

  • Mobile homes destroyed or heavily damaged
  • Major damage to framed homes
  • Many uprooted trees and blocked roads
  • Complete power outages and unavailability of water for several days to weeks

Coastal storm surge reaches 9–12 feet and the barometric pressure is approximately 964–945 millibars.

Hurricane Katrina, which struck Louisiana in 2005, is one of the most devastating storms in U.S. history, causing an estimated $100 billion in damage. It was rated Category 3 when it made landfall. 

Category 4 Hurricane

With a maximum sustained wind speed of 130–156 mph, a Category 4 hurricane can result in catastrophic damage:

  • Most mobile homes destroyed
  • Framed homes destroyed
  • Homes built to withstand hurricane-force winds sustain significant roof damage
  • Most trees snapped or uprooted and roads blocked
  • Electrical poles downed and outages lasting several last weeks to months

Coastal storm surge reaches 13–18 feet and the barometric pressure is approximately 944–920 millibars.

The deadly Galveston, Texas, hurricane of 1900 was a Category 4 storm that killed an estimated 6,000 to 8,000 people. A more recent example is Hurricane Harvey, which made landfall at San José Island, Texas, in 2017. Hurricane Irma, which was a Category 4 storm when it hit Florida in 2017, although it was a Category 5 when it struck Puerto Rico.

Category 5 Hurricane

The most catastrophic of all hurricanes, a Category 5 has a maximum sustained wind speed of 157 mph or higher. Damage can be so severe that most of the area hit by such a storm could be uninhabitable for weeks or even months.

Coastal storm surge reaches more than 18 feet and the barometric pressure is below 920 millibars.

Only three Category 5 hurricanes have struck the mainland United States since records began:

  • The Labor Day Hurricane of 1935 in the Florida Keyes
  • Hurricane Camille in 1969 near the mouth of the Mississippi River
  • Hurricane Andrew in 1992 in Florida

In 2017 Hurricane Maria was a Category 5 when it devastated Dominica and a Category 4 in Puerto Rico, making it the worst disaster in those islands' history. Although Maria hit the mainland U.S., it had weakened to a Category 3.