Weather Trivia - Crazy Temperature Jump Last Week
While we were rainy and relatively cool, one of the world's
craziest, hottest temperature rises happened last week
in Nebraska, but at night! It was a "heat burst"
which is caused by decaying thunderstorms.
The rare setup for a heat burst is dry air directly
beneath a weakening elevated thunderstorm. When a
thunderstorm is weakening air within the thunderstorm
begins to sink. If this sinking air is very dry it will begin to accelerate
toward the ground since it is more dense. Any remaining
precipitation will fall through this dry air and evaporate.
As the air
continues downward, it warms rapidly due to
compression. Needless to
say, a heat burst is noted by a
rapid increase in temperature, an
extreme drop in relative
humidity and an increase in winds. THE QUESTION: How
much did the temperature rise?
ANSWER: The temperature jumped 23 degrees in 45 minutes between
4:15 am and 5:00 at Grand Isle, Nebraska to a whopping overnight
temperature of 93 degrees Fahrenheit just before 5am on June 20th,
2006!












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