Post on 21-Aug-2014
description
Tornado
GROUP MEMBERS
Rumsha Masood (11-ENV-22) Aleena Syed (11-ENV-28) Saira Shehzadi(11-ENV-06) Aafia Tehrim (11-ENV-71)
WHAT IS A TORNADO????
A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulous cloud.
SHAPE OF TORNADO
Tornadoes come in many shapes and sizes, but they are typically in the form of a visible condensation funnel, whose narrow end touches the earth and is often encircled by a cloud of debris and dust.
WIND SPEED Most tornadoes have wind speeds less
than 110 miles per hour (177 km/h) and travel a few miles (several kilometers) before dissipating.
The most extreme tornadoes can attain wind speeds of more than 300 miles per hour (483 km/h), stretch more than two miles (3.2 km) across, and stay on the ground for dozens of miles (more than 100 km).
How do Tornadoes form?
Before thunderstorms develop, a change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.
Rising air within the thunderstorm updraft tilts the rotating air from horizontal to vertical.
An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.
TYPES
Various types of tornadoes include Land spoutMultiple vortex tornadoWaterspoutDust devilSteam devils
DETECTION RADARToday, most developed countries have a
network of weather radar. In the United States and a few other
countries, Doppler weather radar stations are used. These devices measure the velocity and radial direction (towards or away from the radar) of the winds in a storm, and so can spot evidence of rotation in storms from more than a hundred miles (160 km) away.
DETECTION
How Strong Are Tornados?
Strength is measured by the Fujita Scale...
F0 = weakest, F5 = Strongest
Joplin, Missouri EF-5 Tornado
Introduction•Recorded on 22 May,2011.•It hit the city name joplin,of the Missouri a state of America.•It came at 5:35 pm in the evening.
RANGE AND FREQUENCY•Wind speed 210 mph.•The tornado's total track length was at least 22.1 miles (35.6 km) long.•It reached a width of atleast one mile(1.6 km).•It was recorded as EF-5 according to Fujita scale.
DAMAGES
Approximately 160 people died from this tornado.
The injuries were estimated to be around 1,000.
7,000 houses and 2,000 buildings were destroyed.
An estimated 750 people have been treated at area hospitals.
Note the pavement ripped up from the road and piled in front of the cars.
St John Regional Medical Centre
Note the pavement ripped up from the road
St John Regional Medical Centre
A church school in Joplin was also flattened.
Aftermath and impact
A preliminary survey of the tornado damage by the National Weather Service, began on May 23.
According to National Weather Service , about 25% of Joplin was destroyed.
The tornado caused $2.2 Billion Dollars in damage.
Response
Millions more dollars went to individuals for temporary housing and other living expenses.
Three temporary cell towers by May 24, had been restored.
President Obama greeted a tornado survivor on May 29, 2011.
SIGNIFICANCE
seventh deadliest tornado in U.S. history.
26th-deadliest tornado in World history.
It was the first EF5 tornado in Missouri since 1957.
The Tri-State Tornado of 1925
The Tri-State Tornado of 1925
Introduction• Recorded on March 18,
1925.• which roared through parts
of Missouri, Illinois, and Indiana.
• Tornado arrived in Indiana after devastating parts of Missouri and Illinois.
• This tornado occur at 11pm.
• Wind speed 73 mph, 117 km/h .• longest path length (219 miles,
352 km).• It was likely an F5.• longest duration (about 3.5
hours)
RANGE AND FREQUENCY
Tornado Path
• 695 fatalities recorded.
DAMAGES
• The injuries were estimated near 2,027 .
• Thousands of homes and other buildings in the tornado's path were leveled.
• Over 15,000 homes and cities were destroyed.
Significance• It was the most extreme tornado in
recorded history of U.S.• It was likely an F5, though tornadoes
were not ranked on any scale in that era.
• NOAA (National Oceanic and Atmospheric Administration) resources say $16.5 million worth of damage was caused by the tornado, but it does not specify if that is modern amounts or the amount in 1925.
Daultipur-Salturia Tornado
Bangladesh
Introduction
It hit the city of Bangladesh that is Daulatpur-Saturia and Dhaka.
Recorded in April 26th , 1989. It took place at 6:30pm local time.
Range and Frequency
It damaged the entire area of both cities of Bangladesh.
The tornado completely destroyed virtually every structure it touched.
It was estimated to be one mile wide and had a path that was 50 miles north west and north of Dhaka striking 5 districts through the poor slums of Bangladesh.
Range and Frequency
Wind speed 125mph. It lasted 20 minutes or longer. Fujita scale rating is unknown due to
poor housing construction and lack of data.
Damages
• Destroyed 90% of the homes and 153 villages.
• An estimated 1,300 people died from this tornado.
• The injuries were estimated to be around 100,000.
• Damages occurred due to poor housing and construction standards.
• 80,000 people were homeless by the storm.
Damages
Significance
One of the extreme tornadoes in history.
Even though it was deadliest but did not give a proper name.
Bangladesh is a country with highest frequency Tornadoes after United States.
Aftermath and impacts
According to recorded survey area had been in the state of drought for six months after the tornado hit.
It was the costliest tornado in Bangladesh's history.
Due to it's big size it caused billions in damage.
Temporal spacing
In Bangladesh, there are 2 tornado season
( March to May and October to November)
About 25-30 local severe thunderstorms and tornadoes lash the country during each of the two tornado seasons
This tornado destroyed every thing it touched.
Tornado Safety Rules
1. Seek shelter under a sturdy table in the basement.
2. If no basement is available, go to a first floor, small interior room or a room on the opposite side from a tornado. Stay away from windows.
3. In schools, churches, and shopping centers, go to designated shelters away from outside walls, glass, and large rooms (malls, auditoriums). Get under a table or counter or in a restroom or small storeroom. DO NOT GO TO YOUR PARKED CAR
Tornado Safety Rules4. In motels, lie down in the lowest-level interior hallway away from glass. Dive under a bed or pull a mattress on top of you as last resort.
5. In a vehicle, drive away at a right angle to the storm movement. DO NOT GET CAUGHT IN YOUR VEHICLE. Abandon your vehicle and lie in a ditch or culvert or under a low bridge.
Overall: Underground and under a table are the watchwords. People who get under something usually survive.
References
http://en.wikipedia.org/wiki/2011_Joplin_tornado http://en.wikipedia.org/wiki/Tri-State_Tornado http://www.crh.noaa.gov/pah/?n=1925tor• http://wiki.answers.com/Q/How_much_did_the_Daulatpur-_Sat
uria_tornado_cost• http://en.wikipedia.org/wiki/Tornado• http://www.tutorgigpedia.com/3dmaya+tornado+effect_es.ht
ml• http://library.thinkquest.org/03oct/01424/how_do_tornadoes_f
orm.htm