C146 SAFETY OF LIFE AT SEA 



(iii) the time and date (Greenwich Mean Time) when danger last observed. 



(b) Tropical Storms (Hurricanes in the West Indies, Typhoons in the 

 China Sea, Cyclones in Indian waters, and storms of a similar nature in other 

 regions). 



(i) A statement that a tropical storm has been encountered. This 

 obligation should be interpreted in a broad spirit, and 

 information transmitted whenever the master has good reason to 

 believe that a tropical storm is developing or exists in his 

 neighbourhood. 



(ii) Time, date (Greenwich Mean Time) and position of ship when the 

 observation was taken. 



(iii) As much of the following information as is practicable should be 

 included in the message : — 



— barometric pressure, preferably corrected (stating miUibars, 

 inches, or millimetres, and whether corrected or uncorrected); 



— barometric tendency (the change in barometric pressure during 



the past three hours); 

 — true wind direction; 

 —win;! force (Beaufort scale); 

 — state of the sea (smooth, moderate, rough, high); 

 — swell (slight, moderate, heavy) and the true direction from which 



it comes. Period or length of swell (short, average, long) 



would also be of value; 



— true course and speed of ship. 



(c) Subsequent Observations. When a master has reported a tropical or 

 other dangerous storm, it is desirable, but not obligatory, that further 

 observations be made and transmitted hourly, if practicable, but in any 

 case at intervals of not more than three hours, so long as the ship remains 

 under the influence of the storm. 



(d) Winds of force 10 or above on the Beaufort scale for which no storm 

 warning has been received. 



This is intended to deal with storms other than the tropical storms 

 referred to in paragraph (b): when such a storm is encountered, the message 

 should contain similar information to that listed under paragraph {b) but 

 excluding the details concerning sea and swell. 



(e) Sub-freezing air temperatures associated with gale force winds causing 

 severe ice accretion on superstructures. 



(i) Time and Date (Greenwich Mean Time). 



(ii) Air temperature, 

 (iii) Sea temperature (if practicable), 

 (iv) Wind force and direction. 



K\. I>o.- K. ST 1(1 ]•-• Ch. 5 



