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(c)
(a)
125
-2
15
-2
150
2
0
0
200
12
6
250
1 14
300
4
4
10
6
9
8
2
400
2
6
500
0
700
-2
-4
-6
-8
3
-2
0
2
-4
-6
850
-8
2
2
0
1000
82W
80W
78W
76W
74W
72W
70W
68W
0
4
8
12
(b)
-8
-4
Temperature anomaly (K)
km
Tropopause
15
H
Cs
10
Cb
Cb
Cu
Cu
Eye
5
L
0
;
<
300
100
0
100
300
km
Figure 7.16 A model of the (a) areal (b and c) vertical
structure of a hurricane.
Surface streamlines
200 hPa Streamlines
LONGITUDE
150
120
90
60
30
0
30
60
90
120
150
180
40
40
20
20
0
0
20
Boundary of zones of
hurricane formation
Area of sea surface temperature
27°C in the warmest month
Hurricane tracks
20
40
40
150
120
90
60
30
0
30
60
90
120
150
180
Figure 7.17 Formation areas and mean tracks of tropical cyclones .
Source: After Barry and Chorley (1997)
also stresses the role of the eye of the hurricane in
supporting the intense convection as moist air is drawn
into the spinning circulation.
By understanding the type of atmospheric and surface
environment which is most favourable to tropical cyclone
development, efforts have been made to predict their
occurrence on a seasonal basis. The factors which favour
a large number of hurricanes in the Atlantic are: warm sea
water off Africa, weaker than normal trade winds, more
easterly waves off West Africa, a wet Sahel area of West
 
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