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Hurricane Before it Strikes |
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Thursday, 31 May 2007 |
Those of you who have experienced a
hurricane might find a definition of it
superfluous even irritating. However for
the benefit of younger ones among us who
are currently “innocent” of this kind of
event let me give some specifics.
HURRICANE: MEANING:
According to a 1990 booklet, entitled “Be Prepared” and written by the National Disaster coordinator, “A hurricane is by definition a tropical cyclone (storm) in which the winds reach constant speeds of
74 miles per hour or more; and blow in large spiral around a relatively clam center:
the eye of the hurricane. HOW HURRICANE
START. The booklet stated “in
order to develop ‘a hurricane must have a
warm sea and calm air (over hanging the
warm sea).” Now, (in my interpretation of
further statements), the warm sea emits
heat which warms the air about it. And the
warmed air in turn sucks up (plenty) of
water vapour and rises. With this rising
occurring (and given that according to even
ancient philosophers “nature abhors a vacuum)”
the pace of the vapour laden rising
air is taken by air in from the side of the
formation . And given the pre-existent and
constant rotation of the earth, the entire
system begins to revolve.(in our Caribbean
case, the system, with its Genesis of the
coast of West Africa, starts moving towards
the Caribbean)
Now the warm and rising air (with it’s
water-vapour passenger)” meets cool air
(over land masses?); and then, cooled
accordingly, it release it’s water vapor in
the form of rain, And, by the way, seeing
that it makes a great amount of heat energy
for air to leave water vapour, when the
water vapour is released as rain there is
also released the adjoining heat energy.
“And, when this heat energy is released
“a cycle begins to develop. More water is
released and also more heat; and the more
water and heat released, the faster the cycle
goes.”
Thrust from inside to outside
Another aspect of a hurricane is “centrifugal”
force. Explain; (according to the
booklet) since the wind systems are revolving
the force moving outwards from the
center tends to throw their air outwards so
that the pressure in the center becomes
very low.
The result is the formation of the “eye”
of the storm. Within its ambit, winds are
light skies are clear or partly cloudy but
this is deceptive. You see on the border of
the eye are lurking maximum force winds
and to torrential rains according to the
booklet, Many persons have been killed or
injured when lured out of the shelter by the
calm eye. They are subsequently caught in
the maximum winds at the far side of the
eye where the winds blow from the direction
opposite to that of the leading half of
the storm.
The action outside
Further given that the pressure on the
outside of the eye is very high. The wind
and water involved are correspondingly
quickly dissipated the result that “new”
wind moves in faster in attempt to fill that
pressured area. However the faster these
winds move, the more (strangely) the force
in the center throw them outwards. The net
result is very fast (circular) winds; and
these reach 74 Miles or120Kilometres an
hour or more convention accepts these systems
as a hurricane.
Whence the word Grenadian structural
engineer, Tony Gibbbs gave us an insight
into the origin of the word “belt hurricane.”
Writing in The Grenadian
Voice,”1993 July 17, he said “the very
name is derived from the Mayan storm god
“hunraken” and the Arakawa word hurricane
which meant “ Devil wind.”
Some slammers according to Gibbs too,
the worst of all recorded storms was the
“great hurricane” of 1780 October 10th –
18th. This storm struck virtually every
island, from Tobago to the windward to the
Leeward to Hispanola to Cuba, Killing
some 20,000 persons.
He added that in the sixty-year period
(i.e. about 1930 –1990) another 20,000 persons
in the Caribbean were killed by hurricanes.
In Grenada’s case hurricane Janet
took at least 1000 lives.
And of course there was hurricane
David in Dominica1979; Gilbert in
Jamaica, 1989. Hugo in Montserrat and
St.croix, 1989:and Andrew in catBay
Bahamas, 1992.
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