Published On: Thu, Aug 29th, 2019

Hurricane Dorian: Category 4 storm bound for Florida – what are hurricane categories? | World | News

Dorian was the fourth tropical storm and went on to become the second hurricane of the 2019 Atlantic hurricane season. The storm has battered the US Virgin Islands and is now moving away from Puerto Rico. Hurricane Dorian is expected to strengthen into a Category 4 hurricane before making landfall in Florida over the weekend.

What are the categories for hurricanes?

Categories of hurricane are defined by their wind speeds.

Meteorologists use the Saffir Simpson Hurricane Wind Scale to measure a hurricane’s strength.

Category 1: 74-95 mph

Category 2: 96-110 mph

Category 3: 111-129 mph

Category 4: 130-156 mph

Category 5: 157 mph or higher

Before wind speeds reach 74 mph, the system is classed as a Tropical Storm.

What have been the wind speeds of major storms?

Hurricane Katrina hit near Grand Isle, Louisiana in 2005, as a Category 3 intensity.

Causing widespread destruction and fatalities, Katrina quickly upgraded to a Category 5 hurricane.

Hurricane Katrina is thought to have killed 1,833 people.

Sandy approached the US in 2012 as a Category 2 storm, and later strengthened to a Category 3 hurricane.

It is thought to have been the most deadly hurricane in the 2012 Atlantic hurricane season, with reports suggesting 285 people were killed as a result of the storm.

Irma was the first storm on record to maintain wind speeds of 185 mph for 37 hours.

A Category 5 hurricane, Irma claimed the lives of 134 people in 2017.

Known as the deadliest natural disaster ever to have occurred in the United States, the 1900 Galveston hurricane is thought to have killed between 6,000-12,000 people.

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