Hurricane Michael is a Category 4 storm — here’s what those category labels really mean

hurricane michael florida panhandle satellite photo goes 16 noaa october 10 2018 00001

Hurricane Michael is crashing into the Florida Panhandle as a Category 4 storm.
The intensity of hurricanes is most commonly measured by what’s called the Saffir-Simpson scale.
The scale helps estimate potential structural damage and coastal flooding caused by storm surge.
However, the scale is determined by maximum sustained wind speeds of a storm.

Hurricane Michael is barreling into the Gulf Coast, and especially the Florida Panhandle, as a Category 4 storm.

Hurricanes are storms that are so large they can easily be seen by astronauts in space, yet they are tricky-to-categorize weather events.

Over the decades, one classification system has risen above the rest: The Saffir-Simpson scale.

The Saffir-Simpson scale tries to assess a hurricane’s intensity and is used to estimate potential property damage and coastal flooding caused by storm surge — an abnormal rise of water above the normal tide, generated by a storm pushing water ashore.

Winds are a big driver of storm surge, however, so the scale is determined by wind speed.

Flooding from storm surge depends on many factors, such as the storm’s track, intensity, diameter, forward speed of the storm, and the characteristics of the coastline where it comes ashore or passes nearby.

Category 1

Winds of 74-95 mph (120-150 kph). Storm surge of 4 to 5 feet (1 to 1.5 meters) above normal. Damage primarily to un-anchored mobile homes, shrubbery and trees. Some damage to poorly constructed signs and piers. Extensive damage to power lines and poles likely will result in power outages that could last a few to several days.

Category 2

Winds of 96-110 mph (155-175 kph). Storm surge 6 to 8 feet (1.8-2.4 meters) above normal. Some roof, door and window damage to buildings. Considerable damage to mobile homes, small watercraft, trees, poorly constructed signs and piers. Flooding of coastal and low-lying areas. 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

Winds of 111-129 mph (180-210 kph). Storm surge 9 to 12 feet (3 to 4 meters) above normal. Some structural damage to small homes. Mobile homes destroyed and large trees blown down. Coastal flooding destroys smaller structures and floating debris damages larger structures. Terrain lower than 5 feet (1.5 meters) above sea level may flood as far as 8 miles (13 kilometers) inland. Hurricane Katrina, the costliest natural disaster in U.S. history, was a Category 3 storm at landfall in 2005 after being a Category 5 in the Gulf of Mexico. At least 1,800 people died.

Category 4

Winds of 130-156 mph (210-250 kph). Storm surge 13 to 18 feet (4-5 meters) above normal. Wall failures and roof collapses on small homes, and extensive damage to doors and windows. Complete destruction of some homes, especially mobile homes. Power outages will last for weeks to possibly months. Major coastal flooding damage. Most of the area will be uninhabitable for weeks or months. Two 2004 storms …read more

Source:: Business Insider – Tech

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