Tim Samaras is a storm chaser

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Tim Samaras is a storm chaser. His job is to find tornadoes and follow them. When he gets close to a tornado, he puts a special tool (29) ___called___ a turtle probe on the ground. This tool measures things like a twister's temperature. Humidity, and wind speed. With this information, Samaras can learn what causes tornadoes to develop. If meteorilogists understand this, they can warn people (30) ___about__ twisters sooner and save lives.

How does Samaras hunt tornadoes? It's not easy. First, he has to find one. Tornadoes are too small to see using weather satellites. So Samaras can't rely on these tools to find a twister. (31) ___Instead___, he waits for tornadoes to develop.

Once Samaras sees a tornado, the chase begins. But a tornado is hard to follow. Some tornadoes change (32) __direction___ several times – for example, moving east and then west and then east again. When Samaras finally gets near a tornado, her puts the turtle probe on the ground. Being this close to a twister is (33) __terrifying____. He must get away quickly.