weather servicesFAA-published sample question (IRA, Aug 2021)
Consider this AIRMET that includes your route of flight: DFWS WA 211445 AIRMET IFR . . . OK TX FROM END TO TXK TO HOU TO LBB TO END CIG BELOW 010. CONDS ENDG 15-18Z This indicates
A
there will be icing in clouds below 10,000 feet MSL.
B
visibility will be less than 3 SM until 15Z.
C
the area will have low ceilings before 15Z.✓ Correct Answer
Explanation
The header DFWS identifies an AIRMET Sierra, which covers IFR conditions and mountain obscuration; here it forecasts ceilings below 1,000 feet (CIG BLW 010) with conditions ending between 15Z and 18Z, so low ceilings will persist at least until 15Z. It does not describe icing (that would be AIRMET Zulu) and it says nothing about visibility.
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