Thursday, February 14, 2013

Hurricane and Typhoon



Hurricane
DEFINITION
The maximum wind speed is a thing of 30 meters/second or more.
The thing in the Atlantic Ocean, the northeast Pacific Ocean, and a southeast peace on the ocean.
What occurred in the eastern part Pacific Ocean, the Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea.
It is called a "hurricane season" for six months from June 1 to November 30, and it occurs partly every year. Almost all hurricane will develop in three months late in October from the beginning of August.

 Hurricane is divided into five steps of categories by the strength of the wind. Incidentally, "Katrina" which occurred at the end of August, 2005 recorded the "category 5".
Classification
Wind speed(knot)
Wind speed(mph)
Wind speed(m/s)
Category 1
64-82
74-95
33-42
Category 2
83-95
96-110
43-49
Category 3
96-113
111-130
50-58
Category 4
114-135
131-155
59-69
Category 5
>135
>155
>70

Record hurricane
great Hurricane(1780)
Iniki(1992)
Rita(2005)
Galveston 1900(1900)
Mitch(1998)
Wilma(2005)
Camile(1969)
Floyd(1999)
Dean(2007)
Allen(1980)
Isabel(2003)
Felix(2007)
Gilbert(1988)
Ivan(2004)
Gustav(2008)
Hugo(1989)
Jeanne(2004)
Ike(2008)
Andrew(1992)
Katrina(2005)
Sandy(2012)

Ten strongest hurricane higher ranks in an observation in history
The intenseness of hurricane here is based only on the central pressure.
The minimum central pressure
Ranking
Hurricane
Year
Pressure
(mb/hPa)
Ranking
Hurricane
Year
Pressure
(mb/hPa)
1
Wilma
2005
882
6
Katrina
2005
902
2
Gilbert
1988
888
7
Camille
1969
905
3
Labor Day
1935
892
7
Mitch
1998
905
4
Rita
2005
895
9
Dean
2007
906
5
Allen
1980
899
10
Ivan
2004
910

The central pressure at the time of American landing
Ranking
Hurricane
Year
Pressure
(mb/hPa)
Ranking
Hurricane
Year
Pressure
(mb/hPa)
1
Labor Day
1935
892
6
Florida Keys
1919
927
2
Camile
1969
909
7
Okeechobee
1928
929
3
Katrina
2005
920
8
Donna
1960
930
4
Andrew
1992
922
9
Louisiana
1915
931
5
Indianola
1886
925
9
Carla
1961
931

 How much is the size of those damage? Death toll is 1836 and number missing is 705 when Katrina occurred. Moreover, the new damage in which susceptibility gastroenteritis broke out on a massive scale at a refuge place occurred. Otherwise, the jump in an oil price, the influence on a corn market, and the influence on entering school were large.

Typhoon
DEFINITION
The maximum wind speed is a thing of 17 meters/second or more
The thing on the west North Pacific from 180 degrees east
 So, if hurricane goes into the Japan side from 180 degrees east, it will be called a typhoon.

 The typhoon has the property for a wind high up in the sky to pass, and to move, and to go to north under the influence of rotation of the earth. Therefore, at the low latitude which the east wind is usually blowing, a typhoon goes north gradually, passing to the west. And if it comes to high latitude while the strong west wind (westerlies) is blowing high up in the sky, a typhoon will go to northeast at a quick speed. A typhoon progresses using the energy which the heat emitted when the vapor supplied from the warm sea surface condenses and it becomes a cloud droplet. However, when moving, energy is continuously lost by a sea surface or friction with the ground, and if supply of energy is lost, it will disappear in two or three days. Moreover, if it approaches near Japan, the cold will come to flow in high up in the sky, the original property of a typhoon is lost gradually, and it changes to an "extratropical cyclone." Or supply of thermal energy decreases, and it declines and may change to a "tropical cyclone." The typhoon which landed declines quickly because supply of vapor is severed and also energy is lost by friction of land.

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