weather servicesFAA-published sample question (CAX, Aug 2021)
In the following METAR/TAF for HOU, what is the ceiling and visibility forecast on the 7th day of the month at 0600Z? KHOU 061734Z 0618/0718 16014G22KT P6SM VCSH BKN018 BKN035 FM070100 17010KT P6SM BKN015 OVC025 FM070500 17008KT 4SM BR SCT008 OVC012 FM071000 18005KT 3SM BR OVC007 FM071500 23008KT 5SM BR VCSH SCT008 OVC015
A
Visibility 6 miles with a broken ceiling at 15,000 feet MSL.
B
4 nautical miles of visibility and an overcast ceiling at 700 feet MSL.
C
4 statute miles visibility and an overcast ceiling at 1,200 feet AGL.✓ Correct Answer
Explanation
At 0600Z on the 7th the governing group is FM070500 (from 0500Z): 4SM BR SCT008 OVC012. The ceiling is the overcast layer at 1,200 feet, and TAF heights are above ground level, with visibility 4 statute miles in mist. TAF cloud heights are never MSL and visibility is in statute miles, and the 1,500-foot broken layer belongs to the earlier FM070100 group.
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