Public Storm Warning Signal
                     PUBLIC STORM 
WARNING SIGNALS
Introduction
India uses an elaborate signal system ranging from 1 to 11, which 
is hoisted at the ports to warn vessels of a possible cyclonic storm. 
The IMD sends information periodically to ports: usually four times 
a day, and once every three hours in case of a cyclone.
Source: www.thehindu.com
Signal 1
It implies a low pressure area is forming far at sea and 
surface wind could be upto 33 knots (about 60 kmph). 
This signal means the port is not affected but warns of 
slightly higher wind speed.
Source: www.thehindu.com
Signal 2
A depression has formed far at sea with surface 
winds upto 34-47 knots (about 60-90 kmph). This 
signal is a warning for ships leaving the port.
Source: www.thehindu.com
Signal 3
A depression has formed and could affect the port. 
Suface winds likely between 22-27 knots (40-50 
kmph). The port likely to experience squalls.
Source: www.thehindu.com
Signal 4
A deep depression has formed at sea and is likely to affect the port 
later. The surface winds will be around 28-33 knots (approx. 50-60 
kmph). A singal four indicates possible danger to ships stationed at 
the port. Signals 3 and 4 indicates bad weather at the port.
Source: www.thehindu.com
Signal 5
This signal means the deep depression has 
transformed into a cyclonic storm and is likely to cross 
coast keeping port to its left. Surface winds are likely 
34-47 knots (about 60-80 kmph).
Source: www.thehindu.com
Signal 6
Similar to signal 5 but the cyclone is likely to 
cross coast keeping port to its right.
Source: www.thehindu.com
Signal 7
A signal 7 means the cyclone is likely to cross 
coast over or near the port. Signals 5, 6 and 7 
indicate danger to the port.
Source: www.thehindu.com
Signal 8
A 'very danger' warning, which means the cyclone is 
now a severe or very severe cyclone and is expected to 
move keeping the port to its left. Surface winds are 
likely between 48 and 63 knots (approx. 90-120 kmph).
Source: www.thehindu.com
Signal 9
A 'very danger' warning, which means the cyclone 
is now a severe or very severe cyclone and is 
expected to move keeping the port to its right.
Source: www.thehindu.com