Quantcast Wind - 14220_315

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Frontal  Systems,  Continued - 14220_314
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Wind, Continued - 14220_316
Wind Determining Wind Speed For  reasons  previously  discussed  in  this  chapter  and  for  reporting purposes,  Quartermasters  must  be  able  to  compute  the  direction  and velocity  of  the  true  wind.  The  following  discussion  contains  instructions for  observing  the  wind  speed  and  direction  and  computing  true  wind data  (speed,  direction,  gusts,  and  shifts). The  movement  of  the  ship  affects  the  wind  speed  observed  by  both  the ship’s  anemometers  and  hand-held  anemometer.  Relative  wind  is measured  from  the  direction  and  speed  from  which  the  wind  appears  to be  blowing.  Relative  wind  seldom  coincides  with  true  wind  because  the direction  and  speed  of  the  relative  wind  are  affected  by  the  ship’s movement.  For  example,  if  your  ship  is  heading  north  at  10  knots  and true  wind  is  blowing  from  the  south  at  10  knots,  there  appears  to  be  no wind  at  all.  In  another  example,  your  ship  is  heading  north  and  the wind  appears  to  be  blowing  in  on  the  port  bow,  but  the  true  wind  is actually  coming  from  the  port  quarter.  In  our  discussion  of  the  different types  of  wind,  refer  to  the  following  explanations: 1.  True  wind  (TW)  is  the  velocity  and  direction  from  which  the  true wind  is  blowing. 2.  Relative  wind  (RW)  is  the  velocity  and  relative  direction  from  which the  wind  is  blowing  in  relation  to  ship’s  heading  (SH). 3.  Apparent  wind  (AW)  is  the  velocity  and  true  direction  from  which the  relative  wind  is  blowing.  For  example,  if  your  ship  is  heading 090°  and  the  relative  wind  is  blowing  in  on  your  starboard  bow  (045°)  at 15  knots,  the  apparent  wind  is  from  135°T  at  15  knots.  The  formula  for apparent  wind  is:  AW=RW+SH. Wind  speed  (including  gusts  and  squalls)  is  observed,  computed,  and reported  in  nautical  miles  per  hour  (knots)  to  the  nearest  whole  knot. Since  the  true  wind  must  be  computed,  the  chance  of  committing  an error  is  increased.  The  wind  data  reported  is  used  as  criteria  for  wind, storm,  and  high  seas  warnings.  Care  must  be  taken  whenever  computing true  wind.  Wind  data  can  be  observed  using  the  following  methods listed  in  order  of  preference: 1.  Installed  anemometer 2.   Hand-held   anemometer 3.   Visual   estimation 10-19

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