This is abaout tropical strom. my teacher gave the task to make a presentation explaining natural disasters. I and my group explain about tropical storm.
This is abaout tropical strom. my teacher gave the task to make a presentation explaining natural disasters. I and my group explain about tropical storm.
This document looks at the factors that affect weather and climate. The weather systems that also affect the Caribbean is also examined. These include ITCZ, Hurricanes, Cold Fronts, Easterly waves, Anticyclones
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The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
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3. AREAS WHERE TROPICAL CYCLONES
FORM
AREA NAME SEASON
North atlantic
ocean
Hurricane June to november
North pacific Typhoon All year round but
greatest frequency
and intensity june
to november
South pacific Willy willy November to april
South indian ocean Tropical cyclone November to april
4.
5. Factors necessary for tropical cyclone formation
Water temperature of at least 27 degrees Celsius
Rapid cooling of rising air laden with water vapour
and subsequent condensation allows for the release
of latent heat powering the tropical cyclone
High humidity
Low amount of wind shear
6. Form more than 5 degrees north and south allowing
Coriolis force to deflect winds to blow towards low
pressure centre and creating a vortex. In clockwise
circulation in the southern hemisphere
Forming tropical cyclones requires pre existing time of
undisturbed weather to allow for the air to start
circulating
Air flowing westwards (tropical easterly belt)
8. INITIAL STAGE ( TROPICAL LOW)
Stage 1: Formative Stage In the formative stage the
cyclone has very strong up draughts and the low
pressure intensifies. The cyclone is not very large yet
and there is no clear eye yet. The winds start spiralling.
Air pressure above 1000 hPa
9. DEVELOPING STAGE (tropical storm)
UPPER atmosphere divergence takes place
pressure drops to about 990hPa
wind speed increases to about 120km/h
low pressure centre form and huge cumulonimbus clouds
swirling around the vortex
10. MATURE STAGE (TROPICAL CYCLONE)
Stage 2: Mature Stage The pressure gradient is very strong and wind speeds reach
hurricane strength. The calm, clear eye is well developed and the air pressure is less
than 950hPa. The South Western quadrant is the most destructive as the winds and
the Tropical Easterly winds are coinciding. The cyclone can cover distances of up to
300km from the eye. The cyclone moves in a South Westerly direction from the
equator and then turns South East at about 20º South. The low pressure and the fast
wind over the ocean masses cause a storm surge (bulge of sea water) which leads to
further flooding of the coastal areas hit by the cyclone.
11. DECAYING STAGE
Dissipating Stage When the tropical cyclone moves
over land, the wind is slowed down by friction and
there is less evaporation to cause unstable air
conditions. The cyclone also moves into cooler sub-
tropical areas and the air pressure increases. The
weather clears up.
12.
13. Class activity
1.1 State ONE condition that would have favoured the initial development of
tropical cyclone Fanele. (1 x 2) (2)
1.2 Give ONE piece of evidence from the satellite image to suggest that tropical
cyclone Fanele is in its mature stage. (1 x 2) (2)
1.3 Why does tropical cyclone Fanele generally move from east to west? (1 x 2)
(2)
1.4 Explain why tropical cyclone Fanele weakens when it moves over the southern
highlands of Madagascar. (2 x 2) (4)
