weather servicesFAA-published sample question (IRA, Aug 2021)
(Refer to FAA-CT-8080-3F, Figure 7.) What type of weather can be expected in the red scalloped area near area 9?
FAA Figure 7High-level significant weather prognostic chartFAA-CT-8080-3F · Instrument Rating supplement
A
2/8 to 6/8 coverage, occasional embedded thunderstorms, tops at FL 330.
B
1/8 to 4/8 coverage, occasional embedded thunderstorms, maximum tops at 51,000 feet MSL.
C
Isolated embedded cumulonimbus with tops to FL330.✓ Correct Answer
Explanation
The red scalloped area next to marker 9 on Figure 7 is labeled 'ISOL EMBD CB 330/XXX': isolated cumulonimbus embedded in other cloud, tops FL330, and bases below the chart's FL250 lower limit (XXX). Per the Aviation Weather Handbook (27.8.3.2.1), ISOL and OCNL are distinct coverage categories, so descriptions of 'occasional' coverage or tops of 51,000 feet do not match this box.
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