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Page Title: Weather Observation and Reporting
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Weather Observation and Reporting Column Column Number Name 1 Type 2 Time 3 Sky and Ceiling 4 Prevailing Visibility 5 Weather and Obstructions 6 Sea Level Pressure 7 Temperature 8 9 10 11 12 13 Dew  Point Temperature Wind Direction Wind  Speed Wind Character Altimeter Setting Remarks 15 17 21 Observers Initials Station Pressure Total Sky Estimated  total  sky  coverage  by  clouds  or  other Cover obstruction  reported  in  tenths. Explanation Either  SA  for  hourly  observation,  or  L  for  local observation  (OBS).  OBS  are  required  for  aircraft mishaps,  collisions,  man  overboard. The  time  of  the  OBS  always  in  GMT,  must  be recorded  within  5  minutes,  from  55  to  59  only! The  base  of  each  layer  of  clouds  and  the  type  of sky  cover  associated  with  that  layer.  Always drop  the  last  two  zeros  for  the  height.  15  BKN =  1500  feet  and  broken  sky  coverage  at  that layer. This  is  the  prevailing  visibility  reported  to  the nearest  nautical  mile. Report  items  such  as  funnel  clouds,  hail,  sleet, and fog. Sea  level  pressure  in  millibars,  entered  in  ten, units,  and  tenths.  Enter  132  for  1013.2. Enter  the  dry-bulb  temperature  from  the psychrometer. The  nearest  dew  point  temperature  to  the  nearest whole  degree  Fahrenheit. The  direction  from  which  the  TRUE  wind  is blowing. Average  wind  speed  at  the  time  of  OBS. Gusting  or  squalling  if  appropriate. Station  pressure  reduced  to  sea  level. Operationally  significant  information. Self explanatory. Pressure  in  inches. 10-34

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