FAA figures/8080-3F/Figure 7

Figure 7: High-level significant weather prognostic chart

FAA-CT-8080-3F · Instrument Rating supplement · asked on the Instrument Rating test

FAA Figure 7High-level significant weather prognostic chartFAA-CT-8080-3F · Instrument Rating supplement
How to read it: Scalloped lines enclose areas of cumulonimbus; the boxes give the CB tops and bases in hundreds of feet. Jet streams are the long arrows with flight levels and speeds.

1 FAA question that refer to this figure

  1. Question 1 · Instrument Rating

    (Refer to FAA-CT-8080-3F, Figure 7.) What type of weather can be expected in the red scalloped area near area 9?

    • 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.
    Show answer and explanation

    Correct: C. Isolated embedded cumulonimbus with tops to FL330.

    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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