How is a hurricane measured

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*How is a hurricane measured?*

The Saffir-Simpson scale is a standard scale for rating the severity of
hurricanes as a measure of the damage they cause. This scale is based on
the observations of many North Atlantic hurricanes. This scale, being first
developed in the late 1960s by Herbert Saffir, was made to quantity
potential damage from hurricane winds. This scale however, was further
expanded in the early 1970s by Robert Simpson. Presently, there are two
forms of this scale: the Saffir-Simpson Hurricane Scale and the
Saffir-Simpson Hurricane Damage Intensity Scale.

The Saffir-Simpson Hurricane Scale rates hurricanes from category 1 through
category 5 in order of increasing intensity. Each intensity category
specifies the range of conditions based on four criteria: barometric
(central) pressure, wind speed, storm surge, and damage potential. In
category 1, some damage to trees and non-anchored homes, including mild
flooding is expected to occur. In category 2, considerable damage to trees,
causing them to be blown down and more extensive damage to poorly anchored
houses are expected. In category 3, trees will be blown down, minor
structural damage to buildings will occur and more severe flooding will
take place. In category 4, there will be severe damage to roofing and
houses, including damage to coast line structures due to severe flooding.
Finally in stage 5, small buildings will be swept away as major structural
damage occurs, which will result with the evacuation of all living near the
coast due to disastrous flooding.

The Saffir-Simpson Hurricane Damage Intensity Scale, in addition to the
wind speed, outlines the damage potentially possible with an associated
categorized hurricane. This scale is also used to give an estimate of the
potential property damage and flooding expected to occur along the coast as
a result of


Source: library.thinkquest.org/03oct/01424/how_is_a_hurricane_measured.htm


how are hurricanes measured


Saffir–Simpson hurricane wind scale - Wikipedia, the free encyclopedia

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** Saffir–Simpson hurricane wind scale **

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"SSHS" redirects here. For other uses, see SSHS (disambiguation).

*Saffir–Simpson hurricane wind scale*
Category Wind speeds
Five ≥70 m/s, ≥137 knots
≥157 mph, ≥252 km/h
Four 58–70 m/s, 113–136 knots
130–156 mph, 209–251 km/h
Three 50–58 m/s, 96–112 knots
111–129 mph, 178–208 km/h
Two 43–49 m/s, 83–95 knots
96–110 mph, 154–177 km/h
One 33–42 m/s, 64–82 knots
74–95 mph, 119–153 km/h
Additional classifications
Tropical
storm 18–32 m/s, 35–63 knots
39–73 mph, 63–118 km/h
Tropical
depression <17 m/s, <34 knots
<38 mph, <62 km/h

The *Saffir–Simpson hurricane wind scale* (*SSHWS*), or the
*Saffir–Simpson hurricane scale* (*SSHS*) for short, classifies
hurricanes â€“ Western Hemisphere tropical cyclones that exceed the
intensities of tropical depressions and tropical storms â€“ into five
categories distinguished by the intensities of their sustained winds. To be
classified as a hurricane, a tropical cyclone must have maximum sustained
winds of at least 74 mph (33 m/s; 64 kn; 119 km/h) (Category 1). The
highest classification in the scale, Category 5, is reserved for storms
with winds exceeding 156 mph (70 m/s; 136 kn; 251 km/h).

The classifications can provide some indication of the potential damage and
flooding a hurricane will cause upon landfall.

Officially, the Saffir–Simpson hurricane wind scale is used /only/ to
describe hurricanes forming in the Atlantic Ocean and northern Pacific
Ocean east of the International Date Line. Other areas use different scales
to label these storms, which are called "cyclones" or "typhoons", depending
on the area.

There is some criticism of the SSHS for not taking rain, storm speed, and
other important factors into consideration, but SSHS defenders say that
part of the goal of SSHS is to be straightforward and simple to understand.

*Contents*

· 1 History
· 2 Categories

· 2.1 Category 1
· 2.2 Category 2
· 2.3 Category 3
· 2.4 Category 4
· 2.5 Category 5

· 3 Criticism

·


Source: en.wikipedia.org/wiki/Saffir%E2%80%93Simpson_hurricane_wind_scale

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