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P a g e
UNIT 7
READING COMPREHENSION 3
Storm chasers
Scientists, nature freaks, or daredevils?
Reading text
1
We have all seen the pictures on the news: crumpled trailers, flattened houses,
uprooted trees, overturned cars,
shattered glass, twisted metal, downed power lines,
toppled
telephone poles, collapsed bridges, flooded fields and neighborhoods,
debris
and wreckage scattered for miles in the wake of a raging tornado or hurricane. Losing a
loved one, or everything one owns, to a natural disaster is everyone’s worst nightmare.
So, why would anyone in his right mind want to risk his life
chasing after the kind of
weather most people pray will never come their way?
2
There have always been people who like to observe and
track the weather, but
the pastime or passion of storm chasing got its start in the mid-1950s, when researchers
and government employees went out into the field to gather scientific information
about severe weather events. In order to improve weather forecasting and safety, the
National Severe Storms Laboratory (NSSL) was set up in 1964 in Oklahoma,
part of
Tornado Alley, where 90 percent of all tornadoes in the United States touch down. In
1972, the University of Oklahoma developed the Tornado Intercept Project and engaged
meteorology students to
intercept, film, and photograph tornadoes. By the 1990s,
Doppler radar and advanced weather tracking technology had enabled researchers to
collect data, and government sponsored programs like VORTEX (Verification of Origins
of Rotation in Tornadoes Experiment) improved understanding of how tornadoes
develop, as well as the ability to
forecast when and where they would strike.
3
Although tornadoes in the United States begin with
a gentle southern breeze
coming off the Gulf of Mexico, the forces of nature can turn them into devils. As warm
moist air flows toward the Great Plains, it mixes with hot dry air from the American
South and cold air moving down from the Canadian Arctic. Together,
the hot air and
cold air force the tropical air to rise rapidly, creating an updraft that sucks