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Hurricanes - Coggle Diagram
Hurricanes
Characteristics
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no fronts, only 1 air
mass - Tm
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Tend to develop...
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in autumn, when sea
temps higher
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Stages
1-TROPICAL WAVE
forms when light winds come
together (convergence of Easterly
Trade Winds off W coast Africa)
most common tropical disturbance
with abt 100 forming a yr
wind speeds < 25 mph
2- TROPICAL DEPRESSION
wave becomes depression where
presence of CLOSED circulation
sustained winds 25mph
3- TROPICAL STORM
when showers and thunderstorm
activity move over closed circulation
sustained winds 39mph causing
minimal damage
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Structure
(cross section)
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The Eye
calm, generally
clear area
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Hurricane
Hazards
Storm
Surges
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lead to rapid rise in
sea level, accompanied
by large battering waves
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Winds
wind is not the hazard,
but instead what wind causes
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dangerous windborne projectiles
e.g. signs, roofing material etc
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Formation
- WARM OCEAN
- temp exceeding 26°C
- depth of 50m
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- moist air sucked in from
surrounding area to fill gap
- new air RISES via strong
convection currents
- At 100% relative humidity, dew
point temp reached and latent heat
given out through condensation
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- GIANT cumulus
clouds form
- whole system spirals
due to CORIOLIS
(no strong horizontal winds or
spiral would break)
- movement of air in upper troposphere
so constant removal of air from top
so more can be sucked in at bottom
Tracking
- USA National Weather Service
- Satellites - taking pics
- Hurricane hunter planes - fly into storm
- Weather radars - track when comes to land
- Radio station - warn ppl