I Spell SSt inservice course KVGN

1. CYCLONES
K.SUGUNA.R
PGT GEO

2. WINDS
• HORIZONTAL MOVEMENT– WIND
• VERTICAL MOVEMENT ---- AIR CURRENT

3. TYPES OF WINDS
• PLANETARY WINDS
• SEASONAL WINDS
• LOCAL WINDS

4. PRESSURE BELTS

5. PLANETARY WINDS
• TRADE WINDS
• ANTI TRADE WINDS
• POLAR WINDS

6. SEASONAL WINDS
• MONSOON WINDS• NORTH EAST MONSOON
• SOUTHWEST MONSOON

7. LOCAL WINDS
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LAND BREEZE AND SEA BREEZE
MOUNTAIN AND VALLEY BREEZE
CHINOOK WINDS
LOO WINDS

8. CYCLONES
• LOW PRESSURE DEPRESSIONS
• STRONG WINDS
• CYCLONIC STORMS

9. DIFFERENT NAMES OF
CYCLONES
• COMMON NAME : TROPICAL CYCLONE
• INDIAN OCEAN :CYCLONES
• ATLANTIC OCEAN :HURRICANES
• WESTERN PACIFIC
(JAPAN &CHINA SEA) :TYPHOONS
WESTERN AUSTRALIA: WILLY WILLIES

10. CONDITIONS FAVOURABLE FOR
THE FORMATION
• LARGE SEA SURFACE WITH TEMPERATURE
ABOVE 270 C
• PRESENCE OF CORIOLIS FORCE
• SMALL VARIATION IN THE VERTICAL WIND SPEED
• A PRE-EXISTING WEAK LOW PRESSURE AREA
• DIVERGENCE OF AIR IN THE UPPER LAYER

11. FORMATION OF CYCLONES
• EYE OF THE CYCLONE – CENTRE OF THE
CYCLONE
• EYE WALL – RISING AIR
• CUMULONIMBUS CLOUDS

12. TROPICAL CYCLONES
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OCCUR IN TROPICAL REGIONS
STRONG AND POWERFUL
OCCUR IN SEA ONLY
ON LAND- IT DISSIPATES

13. TEMPERATE CYCLONES
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CAUSED IN MIDDLE AND HIGH LATITUDES
CAUSED IN FRONTAL ZONES
OCCUR IN BOTH LAND AND SEA
COVER A LARGER AREA

14. ANTICYCLONES
• HIGH PRESSURE ZONES
• WINDS-BLOW OUTWARDS
• NO RAINFALL

15. THUNDER STORMS
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CAUSED BY INTENSE CONVECTION ON MOIST HOT DAYS
IS A WELL GROWN CUMULONIMBUS CLOUDS PRODUCING
THUNDER AND LIGHTENING.
SOMETIMES CAUSES HAILSTROMS
IF THERE IS INSUFFICIENT MOISTURE –DUST STORMS

16. •
TORNADOES SPIRALLING WIND
FROM SEVERE THUNDERSTORMS SOMETIMES
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DESCENDSLIKE A TRUNK OF ELEPHANT WITH GREAT FORCE.
CAUSES MASSIVE DESTRUCTION ON ITS WAY.
COMMON IN MIDDLE LATITUDES
THE TORNADO OVER THE SEA
IS CALLED WATER SPROUTS