Cyclones

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I Spell SSt inservice course KVGN

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Cyclones

  1. 1. CYCLONES K.SUGUNA.R PGT GEO
  2. 2. WINDS • HORIZONTAL MOVEMENT– WIND • VERTICAL MOVEMENT ---- AIR CURRENT
  3. 3. TYPES OF WINDS • PLANETARY WINDS • SEASONAL WINDS • LOCAL WINDS
  4. 4. PRESSURE BELTS
  5. 5. PLANETARY WINDS • TRADE WINDS • ANTI TRADE WINDS • POLAR WINDS
  6. 6. SEASONAL WINDS • MONSOON WINDS• NORTH EAST MONSOON • SOUTHWEST MONSOON
  7. 7. LOCAL WINDS • • • • LAND BREEZE AND SEA BREEZE MOUNTAIN AND VALLEY BREEZE CHINOOK WINDS LOO WINDS
  8. 8. CYCLONES • LOW PRESSURE DEPRESSIONS • STRONG WINDS • CYCLONIC STORMS
  9. 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. 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. 11. FORMATION OF CYCLONES • EYE OF THE CYCLONE – CENTRE OF THE CYCLONE • EYE WALL – RISING AIR • CUMULONIMBUS CLOUDS
  12. 12. TROPICAL CYCLONES • • • • OCCUR IN TROPICAL REGIONS STRONG AND POWERFUL OCCUR IN SEA ONLY ON LAND- IT DISSIPATES
  13. 13. TEMPERATE CYCLONES • • • • CAUSED IN MIDDLE AND HIGH LATITUDES CAUSED IN FRONTAL ZONES OCCUR IN BOTH LAND AND SEA COVER A LARGER AREA
  14. 14. ANTICYCLONES • HIGH PRESSURE ZONES • WINDS-BLOW OUTWARDS • NO RAINFALL
  15. 15. THUNDER STORMS • • • • 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. 16. • TORNADOES SPIRALLING WIND FROM SEVERE THUNDERSTORMS SOMETIMES • • • • 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

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