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12th Mar 2009, 11:17

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dream747

Join Date: Nov 2006

Location: Tropics

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TAF decoding

Hi all,

I've got a couple of questions regarding decoding of this TAF.

EGPK 1221Z 22015KT 6000 RA OVC030 BECMG 1315 25010KT 3000 +DZ OVC004 FM 18 29025 9999 BKN018 PROB 40 1921 1500 TSGR SCT010CB=

I was asked what is the worst visibility forcast for 1800 UTC. The answer I was given is 10km. I thought FM refers to a quick (in less than 60 min) change in weather occurring at hh hours and mm minutes. If this is the case, wouldn't the change starts to take place anytime from 1800 and visibility at the very worst be at 3000m still?

Thanks!

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