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.

Yesterday  the  southwest  monsoon  had  withdrawn  from some  parts  of  Punjab,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

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