Tornadoes

Tornadoes ? Big ____________________ shaped clouds that can ____________________ through a community and leave a wake of ____________________ . They can ____________________ in seconds , change direction in a heartbeat and their ____________________ can last a lifetime .
Exactly how and why tornadoes ____________________ is still a bit of a mystery but an indication that one is forming is a wall ____________________ .
Fast - moving ____________________ roll air below into a horizontal vortex above opposing surface winds , similar to a ____________________ tube . Warmed by the Sun , buoyant air near the ground begins to ____________________ a section of the horizontal vortex into a vertical position . The vortex extends toward the ____________________ . As it picks up ____________________ anything in its path can be ripped apart or thrown in the air . Upper - level winds tilt the rotating ____________________ called a mesocyclone . This allows a storm to keep ____________________ as warm air is sucked into the storm away from the cool ____________________ .
The vortex spins like a ____________________ , sometimes up to ____________________ miles per hour , and while some tornadoes move slowly , others can travel over the ground at speeds of ____________________ 110 miles per hour .
The ____________________ tornado ever recorded , the May 2013 El Reno tornado in Oklahoma was 2 . 6 miles across . That's wider across than Manhattan ! ____________________ has allowed us to identify essential ingredients needed for ____________________ to form in the US .

____________________ moist ____________________ typically from the Gulf of Mexico , ____________________ air typically from Canada and ____________________ air typically from the Rockies , when these air masses ____________________ they create the perfect conditions for a tornado .
Nearly three - quarters of the world's tornadoes occur in the United States and the ____________________ season is between May and June . A majority touch down in Tornado ____________________ , a section of the central United States but tornadoes have been ____________________ in all 50 states and on every ____________________ except Antarctica .
Tornadoes are very ____________________ and you should never underestimate their ____________________ . The ____________________ time between a tornado warning and a strike is ____________________ at a mere 13 minutes , giving residents little time to seek ____________________ . On average tornadoes killed ____________________ people every year in the United States !
The ____________________ tornado in history was not in the United States but a tornado that ripped through Bangladesh in ____________________ , killing an estimated 1 , 300 people .
We measure the amount of ____________________ to land and property using the EF ____________________ , which ranks tornadoes on six different ____________________ . From zero a heavy breeze that can ____________________ crops to level five , enough wind to ____________________ up a house . It's the desire to better understand them that sends ____________________ into the field year after year in search of answers that can hopefully save ____________________ while putting theirs at risk .