How are low pressure systems classified in India? What are the differences between low, depression and cyclone?
A low pressure system over Indian region is classified based
on the maximum sustained winds speed associated with the system and the pressure
deficit/ number of closed isobars associated with the system. The pressure
criteria is used, when the system is over land and wind criteria is used, when
the system is over the sea. The system is called as low if there is one closed
isobar in the interval of 2 hPa. It is called depression, if there are two
closed isobars, a deep depression, if there are three closed isobars and
cyclonic storm if there are four or more closed isobars.
Considering wind criteria, the system with wind speed of 31 -50 kmph is called as depression and the low pressure system with maximum sustained 3 minutes surface winds between 51–59 kmph is called a deep depression. The system with maximum sustained 3 minutes surface winds of 63 knots or more is called as cyclonic storm
Considering wind criteria, the system with wind speed of 31 -50 kmph is called as depression and the low pressure system with maximum sustained 3 minutes surface winds between 51–59 kmph is called a deep depression. The system with maximum sustained 3 minutes surface winds of 63 knots or more is called as cyclonic storm
System
|
Associated
wind speed
Kmph
|
Low pressure area
|
32
|
Depression
|
32–50
|
Deep Depression
|
51–59
|
Cyclonic Storm
|
60-90
|
Severe Cyclonic Storm (SCS)
|
90-119
|
Very Severe Cyclonic Storm
|
119-220
|
Super Cyclonic Storm
|
Excess of 220
|
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