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On this day in 1979, several tornadoes struck the city of
Woodstock, Ontario in Canada. A tornado is am extreme, destructive, rotating
column of air which descends from a thunderstorm down to the ground. No other extreme
weather incident can match the frenzy and destructive power of tornadoes. A
tornado can be strong enough to destroy large buildings, leaving only the bare
concrete foundations. The strength of a
tornado is measured by the Enhanced Fujita Scale. Scientists don’t fully
understand how tornadoes form. A ‘parent super cell thunderstorm’ is needed to
start a tornado. Some research suggests that it has to do with how strongly the
wind changes direction along with height, how much moisture is in the air or
the difference between the temperature of the surrounding air and the
temperature of the cold down-drafts coming from the storm. Thursday, 7 August 2014
ON THIS DAY IN SCIENCE HISTORY - 7TH AUGUST
On this day in 1979, several tornadoes struck the city of
Woodstock, Ontario in Canada. A tornado is am extreme, destructive, rotating
column of air which descends from a thunderstorm down to the ground. No other extreme
weather incident can match the frenzy and destructive power of tornadoes. A
tornado can be strong enough to destroy large buildings, leaving only the bare
concrete foundations. The strength of a
tornado is measured by the Enhanced Fujita Scale. Scientists don’t fully
understand how tornadoes form. A ‘parent super cell thunderstorm’ is needed to
start a tornado. Some research suggests that it has to do with how strongly the
wind changes direction along with height, how much moisture is in the air or
the difference between the temperature of the surrounding air and the
temperature of the cold down-drafts coming from the storm. 
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