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All You Need to Know About Hurricanes

Be careful this weekend and, as always, share your thoughts, photos, etc. with Martha's Vineyard Patch!

With Hurricane Sandy approaching New England, here are some interesting facts about hurricanes:

What is a Hurricane?
A hurricane is a storm with sustained wind speed of at least 74 miles per hour. A tropical storm has wind speeds of 39 to 73 mph. A tropical depression is a storm with a wind speed of 38 mph.

The Anatomy of a Hurricane
To have a hurricane, you have to have warm water; this is why hurricanes only happen in the summer and early fall.

Hurricanes are started by tropical depressions over water that’s at least 80 degrees. Air from surrounding areas with higher air pressure pushes in to these low-pressure areas, then that “new,” cooler air becomes warm and moist and rises. As that warm air rises, more new, cooler air feeds in to take its place. Eventually, when it rises high enough, the warm air cools, forming clouds, and sinking. The warmth of the ocean, and the water evaporating from its surface continues to rise and swirl, forming the hurricane.

A typhoon is a hurricane in the Pacific.

The word “hurricane” comes from the Taino Native American word, hurucane, meaning “evil spirit of the wind,” according to HurricaneFacts.com.

The planet Jupiter has a hurricane that's been going on for more 300 years, according to HurricaneFacts.com. It can be seen as a red spot on the planet. This hurricane on Jupiter is bigger than the Earth itself.

Measurement
Hurricanes are measured 1 to 5 on the Saffir-Simpson scale. The scale, according to the National Weather Service, was developed by Herb Saffir, a wind engineer, and Bob Simpson, a meteorologist.

While the scale makes references to wind speed, it’s really concerned with the type of damage that winds at particular speeds will create – in other words, intensity, which is not always a direct link to wind speed.

Category 1
Sustained winds of 74-95 mph. “Very dangerous winds will produce some damage.”

“People, livestock and pets struck by flying or falling debris could be injured or killed,” the description says. A Category 1 hurricane could destroy older mobile homes and damage newer ones and poorly built houses. Well-built homes could have damage to shingles, siding, gutters and  soffit panels.

Commercial signs will be damaged, large branches of trees will break and shallow-rooted trees could fall. Hurricane Dolly, in South Padre Island, Texas, in 2008, was a Category 1 hurricane.

Category 2
Sustained winds of 96-110 mph. “Extremely dangerous winds will cause extensive damage.”

“Substantial risk of injury or death to people, livestock and pets.”
Mobile homes built before 1994 will probably be destroyed, as will some newer ones, and some poorly built homes.

Porches and gables of well-built homes could be damaged. Unreinforced masonry walls will collapse. Shallow trees will be snapped or uprooted, roads will be blocked, and power will be lost, with outages that could last from days to weeks. Hurricane Frances, in 2004, was a Category 2 storm.

Category 3
Sustained winds of 111-130 mph. “Devastating damage will occur.”

“High risk of death or injury to people, livestock and pets due to flying and falling debris.” Nearly all mobile homes built before 1994 will be destroyed. Most newer ones will suffer severe damage. Poorly built frame homes will be wrecked. Unprotected windows will be broken by
flying debris. Well-built homes will be damaged, older metal buildings will fail.

Hurricane Ivan, in 2004, was a Category 3 storm.

Category 4
Sustained winds of 131-155 mph. “Catastrophic damage will occur.”

Very high risk of injury or death to people, livestock and pets. In addition to all of the above, well-built homes will lose most of their roofs and exterior walls. Top floors of apartment buildings will be damaged, most windows will be blown out of high-rise buildings, and fallen trees and wires will isolate residential areas. Power outages will last for weeks or months, and most of the area will be uninhabitable. Hurricane Charley, in 2004, was a Category 4 storm.

Category 5
Sustained winds greater than 155 mph. “People, livestock and pets are at very high risk of injury or death from flying debris, even indoors in mobile homes or frame homes.”

Almost complete destruction of all mobile homes, regardless of how new they are or how well built they are. Many frame homes will be destroyed. Nearly all unprotected windows, and many protected ones, will be destroyed. Nearly all trees will be snapped or uprooted. Power outages will last for weeks or months, and most of the area will be uninhabitable.

Some of the Storms

THE 1938 HURRICANE                                                                    It hit New England Sept. 21 of that year and had the fastest forward speed of any hurricane ever, according to HurricaneFacts.com. It was a Category 3 hurricane, with a peak gust of 186 mph, the strongest wind ever recorded in the area. The anenometer broke at that point.

Downed power lines caused huge fires in New London and Mystic.
The storm hit our area at high tide, and at the time of the astronomical high tide, which made the storm surge tremendously high.

Tides were 14-18 feet across much of Connecticut, with 18-25 foot tides from New London to Cape Cod, according to the National Weather Service. Rain from the hurricane added to rain from a storm several days earlier, resulting in 10-17 inches of rain and some of the worst flooding ever in the area. More than 560 people died, and at least 1,700 were injured. A total of 8,900 homes and buildings were destroyed, and more than 15,000 were damaged. More than 2,600 boats were ruined, and 3,300 damaged.

GLORIA
Gloria hit in September 1985. It was a strong Category 1 storm, the first of significant strength to hit our region since 1960’s Hurricane Donna, according to the National Weather Service. Gloria’s winds caused widespread damage, and the worst tree damage in Connecticut since 1938.

THE GREAT GALVESTON HURRICANE
The hurricane that hit Galveston, TX, in 1900, was the deadliest hurricane recorded in the United States. It killed at least 6,000 people; the National Weather Service calls it the greatest natural disaster ever to strike the U.S.

The storm hit Galveston in the evening of Sept. 8, 1900, bringing a gigantic storm surge that inundated most of Galveston Island and Galveston City. Galveston Island is a barrier island, a thin sand strip about 30 miles long and a mile and a half to 3 miles wide. It’s much like the Outer Banks of North Carolina.

There were storm warnings, and they saved thousands of people, according to a report by Isaac M. Cline, local forecast official and section director.

HURRICANE KATRINA
Katrina was the most devastating hurricane in recent American history. It hit Louisiana on Aug. 29, 2005, as a Category 3 storm, killing nearly 2,000 people, and causing $200 billion in damages. New Orleans and the surrounding areas have not yet recovered.

HURRICANE ANDREW
Andrew, which hit the U.S. in August, 1992, was “a small and ferocious Cape Verde hurricane,” according to the National Weather Service, that created terrible and unprecedented economic devastation through the Bahamas, the southern peninsula of Florida and south central
Louisiana.

The nearly $25 billion in damage in the United States made Andrew the most expensive natural disaster in U.S. history, at that time. In Dade County, FL, 15 people died, and as many as 250,000 were left homeless

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