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The F-Scale and EF-Scale In 1971, Dr. Theodore Fujita published the Fujita Scale (F-Scale), which is a scale that is used to rank the power and wind speed of a tornado based upon the damage it causes.
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Feb 26, 2020 · In Canada and the United States, tornado strength is measured using the Enhanced Fujita scale, or EF scale. It ranks tornadoes from 0 (little damage) to 5 (massive damage). Tornado damage shown using the Enhanced Fujita Scale (Let’s Talk Science using data from the National Oceanic and Atmospheric Administration (NOAA) and an image by ...
- Intro Quick Recap:
- Demo #2 Quick Recap: “Smoke Tornado”
- Experiment Quick Recap: “Tornado in a Bottle”
- Experiment Quick Recap, cont.: “Tornado in a Bottle”
- Items needed for Instructor:
- Optional Item, for the very adventurous:
- Part 1:
- Story Recap (cont.): “Evil Mister Fred's Whirlpool”
- Ending:
- Transcript: Intro
- Demo #1: “Shoot a Pencil through Cardboard”
- [Shoots pencil at the box.]
- Story: “Evil Mister Fred's Whirlpool”
- Imagination and Brainstorming Time
- Demo #2: “Smoke Tornado”
- “Tornado in a Bottle”
- [Instructor lines up four sets of bottles, one of each color.]
- End of Story
The Sun shoots charged particles at the Earth, and the particles are deflected by the Earth’s north and south magnetic fields. Some come to the North Pole and some to the South Pole. Some of the particles are positive charge and some are negative charge. There’s a little bit of charge separation, so there’s a current that flows through the Earth, a...
[Note: This is an elaborate device built by Mr. Mac. It’s not required for the lesson, so we don’t include detailed info on it in this Guide.] The Smoke Tornado device has clear plastic panels. Most of them are sealed with tape, but every other one has the bottom edges open. There’s a leaf blower and flashlight on top. There’s a stage fog machine o...
Each student receives a set of plastic bottles, one inverted on top of the other and sealed together The Instructor shows students a set of plastic bottles, one inverted on top of the other and sealed together in the middle. The bottom bottle is about three-quarters full of water with some glitter in it to make the water’s movements more visible. T...
their tornado do the snake dance. (They may notice that the larger the hole, the harder it is to make the tornado wiggle, because the water flows out too fast.) Tell student the story about how flushing a toilet in the Northern Hemisphere makes the water swirl counter-clockwise, while flushing it in the Southern Hemisphere makes it swirl clockwise....
“Smoke Tornado” machine (optional, see next page) Air gun Sharpened pencil Cardboard box Machine oil (a few drops) Items needed for Students:
• We realize very few teachers will actually build this device, so we’ll just give you a few shots of it here, for those who are interested. There’s also a short video clip (no audio) on the web page for this lesson. If you’re handy with tools and would like more info so you can build it,please ask your questions in our Support Forum. Tornado mach...
Evil Mister Fred wanted his minions to learn how to be like Navy Seals so they could build him a castle underwater in the North Sea. He put goggles and swim fins on the minions, then tied a big rock on their head so they could sink. The minions built the castle and Evil Mister Fred stood on top, using a straw to suck air out of the castle. When the...
This got the attention of some ocean creatures, including a swordfish, an electric eel, a hammer-head shark, and a chain saw killer shark. Up on the surface, Jack and Jill were passing by on a raft and saw the plastic bags appearing and disappearing. They got closer and asked the minions what they were doing , but the minions wouldn’t tell them. Ji...
Jill can talk to animals, so she stuck her head under the water and yelled “Help” to the fish. The hammerhead shark swam up and smashed the raft so Jack and Jill were thrown clear of the whirlpool. Then Evil Mister Fred asked the swordfish to go and chop up Jack and Jill. In return, he would sharpen the swordfish’s sword. The swordfish agreed and h...
There’s Sun. There’s Earth. Earth has magnetic fields around it. North and South magnetic fields. And the Sun shoots stuff at us. The Sun is kind of a practical joker. It likes to shoot us with bullets that are really fast. They travel at about one-tenth the speed of light, and they hit us. They try to hit us anyway. And they come shooting in, and ...
We can show you a simple example. I just put an air gun here, and I put some oil in it so it’s slippery inside. We’ll just put a pencil in there, and we’re going to point it at this cardboard box. And we just point it right at the box, and it’s going to come out there at about, oh, a hundred and fifty miles an hour. So let’s see what it does.
Put pencil into air gun. It leaves a little bit of a hole. [Shows pencil tip on other side.] It didn’t even break the lead at a hundred and fifty miles an hour. So the wind itself doesn’t have that much power with little things, but if you get a whole car flying at the piece of cardboard, that’ll hurt. If you lubricate it a little bit, just the tub...
Now, we need a crazy story. Once upon a time, Evil Mister Fred thought his minions needed some training. They needed to learn how to be Seals. Not the kind of seals that eat fish, but the kind of Seals that are Navy guys that go out and sneak up like commandos and put explosives un-derwater, and do stuff like that. They weld things underwater, and ...
[Students make suggestions] (THERE ARE NO WRONG ANSWERS! Whatever they say, you should reply: “That’s a good idea,” “They might do that,” etc. After brainstorming, proceed with the experi-ments, then finish the story.) We’ll leave this “To be Continued . . .”
[Note: This is an elaborate device built by Mr. Mac. It’s not required for the lesson, so we don’t include detailed info on it in this Guide.] This is a thing. It’s got a rubber tire at the bottom, kind of a strange place for a rubber tire to be. It’s got plastic panels. Most of them are sealed up with tape, but the bottom has edges that are open o...
[Indicates two bottles, one inverted on top of the other.] There’s water there [lower bottle], and there’s no water there [upper bottle]. I want the water to go from there [lower] to there [upper]. [Student: Flip it!] Flip it, okay. [Flips bottles over to reverse their positions.] So I flip it over and it starts to snow [referring to glitter in the...
Okay, these are arranged according to the size of the hole. Green is the smallest, black is the biggest, red’s medium, blue’s a little bigger. Now we’ll wait for our green guy to be done [green bottle still has water in the upper section]. And you’ll see pretty much the same amount of water. Can you think of some way that we could tell, what kind o...
* DO NOT * present this part of the lesson until after the experiments! So Jack and Jill are on their raft. And their raft is trapped in the whirlpool. And they’re screaming, “Ahhhhhhhh!” And Jill sticks her head under the water and screams, “Help!” She can talk to fish. Down there is a hammerhead shark, a swordfish, electric eel, and a killer shar...
I can describe what tornadoes are and how they form. Warm-Up: 1. Do you think tornado warnings or tornado watches are more serious? Why? (answer on a piece of paper) 2. Use this Quizziz to see what you already know about tornadoes and other types of severe weather.
Aug 23, 2023 · Tornadoes are assigned a rating from EF0 to EF5. The EF stands for Enhanced Fujita, which is the name of the scale. The EF scale has been used in Canada since 2013. EF0 is the weakest and EF5...
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Tornadoes are classified according to the damage they cause, using the Fujita Scale. Fujita Pearson Tornado Scale F-0 40-72 mph Chimney damage, tree branches broken.
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