MONSOON

MONSOON IS A CLIMATOLOGICAL FEATURE CHARACTERIZED BY SEASONAL REVERSAL OF WIND DIRECTION AND SUMMER RAIN.

IT BRINGS RAIN TO 1/4 TH OF EARTH SURFACE.

THERE ARE THREE BRANCH OF MONSOON

1) ASIAN - AUSTRALIAN
2)AFRICAN
3)AMERICAN.

HALLEY (FAMOUS NAME OF A COMET ) WAS THE FIRST TO ASSOCIATE THE MONSOON WITH THE AVERAGE TEMPERATURE DIFFERENCE BETWEEN LAND MASS AND OCEAN.

THE MONSOON ARE EXPERIENCED BETWEEN 20 DEGREE NORTH AND SOUTH OF EQUATOR.

FOLLOWING ARE THE IMPORTANT PHENOMENON THAT AFFECTS INDIAN MONSOON

1) DIFFERENCE IN TEMPERATURE OF LAND AND SEA ( INDIAN OCEAN)

2) HIGH TEMPERATURE OVER TIBETAN  PLATEAU 

3) HIGH PRESSURE EAST OF MADAGASCAR ; 20 DEGREE SOUTH

4) INTER TROPICAL CONVERGENCE ZONE (ICTZ) OVER GANGES PLAIN IN SUMMER
     WHICH IS A BELT   OF LOW PRESSURE TROUGH  NORMALLY AT 5 DEGREE LATITUDE

5) FLOW OF WESTERLY JET STREAM  NORTH OF HIMALAYA AND
     AND TROPICAL EASTERLY JET STREAM DURING SUMMER.

6) IN SOME YEARS TEMPERATURE OF SOUTHERN PACIFIC OCEAN IS GREATER THAN THAT OF SOUTH INDIAN OCEAN BUT THIS CONDITION REVERSES IN SOME YEARS REGULARLY. THIS IS CALLED SOUTHERN OSCILLATION. 

7) WARM OCEAN CURRENTS TAKES PLACE OF THE COLD PERUVIAN CURRENT AFTER EVERY 2 -5 YEARS. THIS IS CALLED EL - NINO.

8) TEMPERATURE DIFFERENCE BETWEEN TAHITI AND DARWIN . IF IT IS NEGATIVE IT MEANS LATE MONSOON OR LESSER MONSOON OTHERWISE NORMAL MONSOON.

MONSOON WIND PATTERN 

IMPORTANT DATES ASSOCIATED WITH MONSOON

 

1)      MONSOON REACH ISLANDS SOUTH CORNER IN THE FIRST WEEK OF APRIL.

2)   MONSOON  REACH ISLANDS NORTH CORNER IN THE FIRST WEEK OF MAY.

3)  IT REACHES SOUTHERN MOST POINT AS ARABIAN SEA BRANCH ON 1ST OF JUNE.

4)  ON THE SAME DATE BAY OF BENGAL BRANCH ALSO REACHES  N E STATES .

5)  WHEN ARABIAN SEA BRANCH REACHES HYDERABAD ON 5 JUNE BAY OF BENGAL BRANCH COMES OUT OF N E STATES.

6) WHEN ARABIAN SEA BRANCH REACHES MUMBAI ON THE 10 TH OF JUNE BAY OF BENGAL REACHES PATNA AND BOTH OF THEM MERGES .

7) ON 15 JUNE IT REACHES AHMADABAD .


8) ON LAST FEW DAYS OF JUNE OR IN THE FIRST WEEK OF JULY IT REACHES DELHI.
9) BETWEEN JANUARY AND DECEMBER MONSOON WINDS GET OUT OF INDIAN ISLANDS.