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Yesterday the southwest monsoon had withdrawn from some parts of Punjab,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