Tornadoes: A Whirlwind Tour By: Mr. Donahue Objectives To define what a tornado is To discuss...
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Transcript of Tornadoes: A Whirlwind Tour By: Mr. Donahue Objectives To define what a tornado is To discuss...
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Tornadoes: A Whirlwind Tour
By:
Mr. Donahue
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Objectives
• To define what a tornado is
• To discuss various characteristics of a tornado
• To discuss where tornadoes can occur, including in Pennsylvania
• To discuss safety issues involving tornadoes
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What is a Tornado?
• A violently rotating column of air, usually pendant to a cumulonimbus, with circulation reaching the ground. It nearly always starts as a funnel cloud and may be accompanied by a loud roaring noise. On a local scale, it is the most destructive of all atmospheric phenomena.
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How Do Tornadoes Form?
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How Do Tornadoes Form?
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Most Tornadoes Form in Tornado Alley
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Do We Have Tornadoes in Our Area?
Number of Tornadoes in Pennsylvania Counties From 1881 to Present
02468
101214161820
CarbonLuzerneSchuylkillLehighMonroe
NorthhamptonLackawanna
Counties
Number of Tornadoes
Number of Tornadoes
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Tornado Damage From an F3in Wyoming County, PA
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Across the State
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How Fast Can Tornadoes Travel?
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F
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Tornado Watches and Warnings
• “A tornado warning means that a tornado has been spotted, or that Doppler radar indicates a thunderstorm circulation which can spawn a tornado.”
• “A tornado watch defines an area shaped like a parallelogram, where tornadoes and other kinds of severe weather are possible in the next several hours.”
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Summary of 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
* Source: http://www.public.iastate.edu/~atmos/tornado_safety_rules.html
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Summary of Tornado Safety Rules
4. 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.
* Source:http://www.public.iastate.edu/~atmos/tornado_safety_rules.html
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Tornado Quiz
1. What is the best
description of a
tornado?
a) A funnel cloud
b) A whirlwind starting
from a stratus cloud
c) A violently rotating
column of air, pendant
to a cumulonimbus.
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Tornado Quiz
2. Wind speed and
direction change with
altitude, causing
a horizontal spin, then
strong updrafts within
a thunderstorm lift the
air into a loop, which
can intensify into a
tornado?
a) True
b) False
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Tornado Quiz
3. Where do most
tornadoes form in the
United States?
a) The East Coast
b) The West Coast
c) The Central Parts
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Tornado Quiz
4) How many
tornadoes have been
reported in Carbon
county since 1881?
a) 0
b) 2
c) 3
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Tornado Quiz
5) Every county in Pennsylvania has reported at least one tornado since 1881?
a) True
b) False
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Tornado Quiz
6) How fast can tornadoes travel?
a) 30 mph
b) 50 mph
c) 80 mph
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Tornado Quiz
7) A tornado warning means:
a) A tornado has
been spotted
b) Doppler radar indicates a thunderstorm circulation which can spawn a tornado.
c) Both a and b
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Tornado Quiz
8) When a tornado watch has been issued for your location, you should be alert for the potential of a tornado and be prepared to take shelter, if necessary.
a) True
b) False
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Tornado Quiz
9) If your house does
not have a basement,
where should go in
the event of a
tornado?
a) By a window
b) In the Atticc) A first floor, smallinterior room or a roomon the opposite sidefrom a tornado.
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Tornado Quiz
10) Overall: Underground and under a table are the watchwords. People who get under something usually survive tornadoes.
a) True
b) False
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Resources
• http://library.thinkquest.org/03oct/01424/how_do_tornadoes_form.htm
• http://pasc.met.psu.edu/PA_Climatologist/extreme/Tornado/PEMA_tornado.html
• http://www.spc.noaa.gov/faq/tornado/#Safety