Saturday, September 24, 2011

2011 south west monsoon has started withdrawing


Withdrawal of SW Monsoon

a)           Withdrawal from extreme north-western parts of the country is not attempted before 1st September.

b)           After 1st  September:

The following major synoptic features are considered for the first withdrawal from the western parts of NW India.

i       Cessation of rainfall activity over the area for continuous 5 days.
ii)       Establishment of anticyclone in the lower troposphere (850 hPa and below)
iii)      Considerable reduction in moisture content as inferred from satellite water vapour imageries and tephigrams.

23-Sep-2011
Yesterday  the  southwest  monsoon  had  withdrawn  from some  parts  of  Punjab,
Haryana, Rajasthan, Gujarat and north Arabian Sea.The withdrawal line passes through
Amritsar,   Hissar,   Ajmer,   Deesa,   Porbandar,   Lat.21.0°N/Long.65.0°E   and
Lat.21.0°N/60.0°E.


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