WMO/TD No. ...... (iii) Automatic Message Switching System (AMSS) ...... 9, TD. 4,
Volume D, Part D - Visual Storm Warning Signals Annexes II and III respectively.
...... 53a Hoisted at the Colombo Pilot Station ...... within a specified range (e.g. 1-
2cm, 2-5cm etc) is counted (M) and the probability is expressed as 100*(M/20). 
