National Solar Radiation Data Base User's Manual (1961-1990)

Table of Contents

Appendix C: 30-Year Summary of Quality Flags


Appendix D
Key to the Present Weather Elements

Appendix D provides the key for the present weather elements included in the TD-3282 and NSRDB synoptic formats.




Table D-1. Present Weather Elements in the NSRDB and TD-3282 Format
  NSRDB  
  Column
TD-3282 Element

Values

Remarks

Code Position
  096

  PWX1

  XXXXX

  Observation Indicator  
  0 or 9

  0 = Weather observation made.  
  9 = Weather observation not made, or missing.  
  097















  PWX1  















  XXXXX  















  Occurrence of
  Thunderstorm,
  Tornado, or Squall  













  0 - 2, 4,
  6 - 9














  0 = Thunderstorm - lightning and thunder. Wind
  gusts less than 25.7 m/s, and hail, if any, less than
  1.9 cm diameter.
  1 = Heavy or severe thunderstomm - frequent intense
  lightning and thunder. Wind gusts greater than 25.7 m/s  
  and hail, if any, 1.9 cm or greater diameter.
  2 = Report of tornado or waterspout.
  4 = Moderate squall - sudden increase of wind speed
  by at least 8.2 m/s, reaching 11.3 m/s or more and
  lasting for at least one minute.
  6 = Water spout (beginning January 1984)
  7 = Funnel cloud (beginning January 1984)
  8 = Tomado (beginning January 1984)
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.
  098
















  PWX1
















  XXXXX
















  Occurrence of Rain,
  Rain Showers, or
  Freezing Rain  














  0 - 9  
















  0 = Light rain
  1 = Moderate rain
  2 = Heavy rain
  3 = Light rain showers
  4 = Moderate rain showers
  5 = Heavy rain showers
  6 = Light freezing rain
  7 = Moderate freezing rain
  8 = Heavy freezing rain
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  Light = up to 0.25 cm per hour
  Moderate = 0.28 to 0.76 cm per hour
  Heavy = greater than 0.76 cm per hour
  099






















  PWX1  






















  XXXXX  






















  Occurrence of Rain
  Squalls, Drizzle, or
  Freezing Drizzle  




















  0, 1,
  3 - 9  





















  0 = Light rain squalls
  1 = Moderate rain squalls
  3 = Light drizzle
  4 = Moderate drizzle
  5 = Heavy drizzle
  6 = Light freezing drizzle
  7 = Moderate freezing drizzle
  8 = Heavy freezing drizzle
  9 = None if Observation Indicator element equals 0, v
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  When drizzle or freezing drizzle occurs with other
  weather phenomena:
  Light = up to 0.025 cm per hour
  Moderate = 0.025 to 0.051 cm per hour
  Heavy = greater than 0.051 cm per hour

  When drizzle or freezing drizzle occurs alone:
  Light = visibility 1 km or greater
  Moderate = visibility between 0.5 and 1 km
  Heavy = visibility 0.5 km or less
  100















  PWX1















  XXXXX  















  Occurrence of Snow,
  Snow Pellets, or Ice  
  Crystals













  0 - 9  















  0 = Light snow
  1 = Moderate snow
  2 = Heavy snow
  3 = Light snow pellets
  4 = Moderate snow pellets
  5 = Heavy snow pellets
  6 = Light ice crystals
  7 = Moderate ice crystals
  8 = Heavy ice crystals
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  Beginning in April 1963, any occurrence of ice
  crystals is recorded as a 7.
  101








  PWX2  








  XXXXX  








  Occurrence of Snow  
  Showers, or Snow
  Squalls






  0 - 5, 9  








  0 = Light snow showers
  1 = Moderate snow showers
  2 = Heavy snow showers
  3 = Light snow squall
  4 = Moderate snow squall
  5 = Heavy snow squall
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.
  102











  PWX2











  XXXXX  











  Occurrence of Sleet,
  Sleet Showers, or Hail  










  0 - 2,
  4, 9  










  0 = Light ice pellet showers
  1 = Moderate ice pellet showers
  2 = Heavy ice pellet showers
  4 = Hail
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  Prior to April 1970, ice pellets were coded as sleet.
  Beginning in April 1970, sleet and small hail were
  redefined as ice pellets and are coded as 0, 1, or 2.
  103















  PWX2  















  XXXXX  















  Occurrence of Fog,  
  Blowing Dust, or
  Blowing Sand













  0 - 9  















  0 = Fog
  1 = Ice fog
  2 = Ground fog
  3 = Blowing dust
  4 = Blowing sand
  5 = Heavy fog
  6 = Glaze (beginning 1984)
  7 = Heavy ice fog (beginning 1984)
  8 = Heavy ground fog (beginning 1984)
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  These values recorded only when visibility is less
  than 11 km.
  104














  PWX2














  XXXXX  














  Occurrence of Smoke,  
  Haze, Smoke and
  Haze, Blowing Snow,
  Blowing Spray, or
  Dust










  0 - 7, 9  














  0 = Smoke
  1 = Haze
  2 = Smoke and haze
  3 = Dust
  4 = Blowing snow
  5 = Blowing spray
  6 = Dust storm (beginning 1984)
  7 = Volcanic ash
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

  Notes
  These values recorded only when visibility is less
  than 11 km.
  105





  PWX2  





  XXXXX  





  Occurrence of Ice  
  Pellets




  0 - 2, 9  





  0 = Light ice pellets
  1 = Moderate ice pellets
  2 = Heavy ice pellets
  9 = None if Observation Indicator element equals 0,
  else unknown or missing if Observation Indicator
  element equals 9.

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