WeatherCâu 64 / 100
A TAF reads: KOKC 121120Z 1212/1318 14008KT P6SM SCT030 FM121800 18015G25KT 4SM -RA BKN015. What does the FM121800 group forecast?
a.Conditions expected only briefly, for less than one hour after 1800Z
b.The end of the valid forecast period at 1800Z on the 12th
c.That 14008KT and more than 6 SM visibility will persist all day
d.A rapid change at 1800Z to 18015G25KT, 4SM in light rain, BKN015
Giải thích
FM means "from" and marks a rapid, sustained change that begins at the stated day and time, so from 1800Z on the 12th the forecast is wind 180 degrees at 15 knots gusting 25, 4 SM visibility in light rain, and a broken layer at 1,500 ft. Brief, temporary fluctuations would be coded TEMPO, and a gradual transition would be BECMG. The validity period 1212/1318 runs from 1200Z on the 12th to 1800Z on the 13th, so 1800Z on the 12th is not the end of the forecast, and the earlier conditions do not persist.
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