text: Appendix A
  CHEMICAL DOWNWIND MESSAGE [CDM] (continued)
  REPORT NUMBER: C050 {USMTF #J020}
  LINE 10 – WEATHER __________________________________________(significant weather phenomena
  code:
  0 = no significant weather
  1 = sea breeze
  2 = land breeze
  3 = blowing snow and sand
  4 = fog, ice fog, and thick haze
  5 = drizzle
  6 = rain
  7 = light rain or snow, snow mixed
  [no shower]
  8 = showers of rain, snow, rain and
  snow, mixed, hail
  9 = thunderstorms
  A = top inversion layer lower than
  800M
  B = top inversion layer lower than
  400M
  C = top inversion layer lower than
  200M)
  **Advise your USAF SWO that line 10 parameters are not part of the Air Force’s routine meteorological data
  categories and will need to be researched elsewhere.
  LINE 11 – CLOUD COVER _____________________________________(cloud cover code:
  0 = sky less than half covered
  1 = sky more than half covered
  2 = sky completely covered
  **Repeat lines 5 through 11 to indicate multiple missions/mission data. Assign sequential lines to succeeding
  iterations. For example, first iteration is 5 through 11; second iteration is 5a through 11a; third iteration is 5b
  through 11b; and so on.
  LINE 12 – NARRATIVE ________________________________________(free text for additional information
  required for report clarification)
  LINE 13 – AUTHENTICATION __________________________________(report authentication)
  Table A-41. Chemical downwind message acronym and abbreviation key
  AO area of operations
  C Celsius
  CDM chemical downwind message
  DEG degrees
  DTG date-time group
  KM kilometers
  M meters
  MPH miles per hour
  N neutral
  S stable
  SWO staff weather officer
  U unstable
  USMTF United States message text format