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In which of the following METAR reports is the probability of fog formation in the coming night the highest?
  • A
    201850Z 25010KT 4000 RA BKN012 OVC030 12/10 Q1006 TEMPO 1500=
  • B
    201850Z 21003KT 8000 NSC 12/M08 Q1028 NOSIG=
  • C
    201850Z 06018G30KT 5000 -RA OVC010 04/01 Q1024 NOSIG=
  • D
    201850Z 15003KT 6000 SCT100 05/04 Q1032 BECMG 1600 BR=

Favourable conditions for overnight fog formation: calm or light wind, small difference between temperature and dew point (high RH: relative humidity), clear sky.

201850Z 25010KT 4000 RA BKN012 OVC030 12/10 Q1006 TEMPO 1500=

201850Z 21003KT 8000 NSC 12/M08 Q1028 NOSIG=

201850Z 06018G30KT 5000 -RA OVC010 04/01 Q1024 NOSIG=

201850Z 15003KT 6000 SCT100 05/04 Q1032 BECMG 1600 BR= >>> light wind, small difference between temperature and dew point >>> scenario with highest probability of fog formation.

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