India uses an 11-point signal system displayed at ports to warn ships of potential cyclonic storms, with the India Meteorological Department sending updates usually 4 times daily and every 3 hours during cyclones. The signals range from indicating a developing low pressure area at sea with winds up to 60 kph to "very severe" cyclones exceeding 220 kph expected to cross near the port. A signal 11 means all communication has been lost with the cyclone warning office.

2.  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.

3.  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.

4.  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.

5.  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.

6.  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.

7.  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).

8.  Similar to signal 5 but the cyclone is likely to
cross coast keeping port to its right.

9.  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.

10.  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).

11.  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.

12.  A 'very danger' warning, which means it is a
very severe cyclone and is expected to cross
over or near the port. Wind speed will be 64-
119 knots (120-220 km/h) super cyclone -
above 120 knots (over 220 kmph and more)

13.  This means all communications have failed
with cyclone warning office.