Weather
In 'TAF KDSM 281130Z 2812/2912 14008KT P6SM SCT035', what does the group 2812/2912 indicate?
Answer
The forecast is valid from 1200Z on the 28th until 1200Z on the 29th
A TAF validity group is a pair of two-digit date/two-digit hour groups: valid from day 28 at 1200Z to day 29 at 1200Z. Choice B confuses it with a wind group, which would end in KT. Choice C is wrong because issuance time is the 281130Z group and '2812Z' is not a valid clock time. Choice D is wrong because TAF visibility is coded like P6SM, never as paired date/hour groups.
Source: AC 00-45H, Terminal Aerodrome Forecast (TAF) section
Not the answer
- Winds from 280° at 12 knots becoming 290° at 12 knots
- The forecast was issued at 2812Z and amended at 2912Z
- Visibility will vary between 28 and 29 statute miles
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