how do i know when a tornado is about to happen i need as many answers as possible for a school report?

Answer 1

A sharp drop in barometric pressure over a short time is a sign to run for cover.

Answer 2

I have personally seen and been through 8 tornadoes. All of them, without exception exhibited the following criteria: The sky turned a shade of green that I have never seen other than during tornadoes. It became eerily quiet just before touchdown - not a leaf was moving. The humidity those days was outrageously high. People get scared with a black sky, but green is what I look for. Also, just before the tornado hit, the wind would suddenly pick up immensely and there would be heavy rain or hail. I find storms fascinating - actually, weather in general.

Answer 3

Okay, long answer and semi complicated but bear with me. The indivual components actually rely heavily on weather patterns, not just thunderstorms, you need hot dry air, moisture and a upper level jet if these ingredients are just right any thunderstorms that bubble up in these unstable conditions start to rotate and build into supercells.

Not all rotating supercells produce tornadoes, other factors such mesocyclones within the storm are believed to be the cause of all tornadoes, these are rapidly rotating wind shear with the clouds and these can be picked up on doppler, once detected almost instantly the storm is upgraded into a tornadic supercell but again not 'all' tornadic supercells produce tornadoes. Other factors, some still unknown to us play parts in the final phase.

But as your question stated, how to I know when a tornado is about to happen? First off, it takes alot of training and knowledge to even spot what storms are severe enough to produce tornadoes. But first off, you need to know what each type of cloud structure is, one type of cloud structure that is a first sign of severe weather is the 'mammatus cloud' but also you need to know what a supercell looks like and then you can slowly build up into more advanced weather physics such as wall clouds and Mesocyclones.

Finally to answer your question, when you see a thunderstorm that is tornadic you'll first see the wall cloud within the storm, these themselves are huge and are easy to spot, mesocyclones are significant lowering of the clouds, and finally funnel clouds which when these touch the ground, they become tornadoes.

Answer 4

The temperature will drop drastically. Hail usually precedes the tornado along with the temperature change. It will also be very calm prior to the tornado, hence the term the calm before the storm. When it forms the funnel cloud and begins to head toward something it will then sound like a freight train and the wind will blow fiercely. That is definitely time to get below. Enjoy your report.

Answer 5

The sky actually takes on a greenish tint. Sometimes it will be raining or windy or something and all of a sudden it will get really still and calm, it's eery. Hail sometimes precedes a tornado too.

Answer 6

When you see a super cell thunderstorm that has a wall cloud extended from the base of the core, and usually any rotation from the base of a thunderstorm is a good indicator.

Answer 7

When the ****** roof blows off your house

Answer 8

Type "Storm prediction center" into your search engine.

Answer 9

from weather report?

Answer 10

http://library.thinkquest.org/03oct/01352/tornadosigns.htm


Hope this helps you.