weather servicesFAA-published sample question (ATM, Aug 2021)
How are wind speeds of 100 through 199 knots indicated on a Wind and Temperature Aloft Forecast?
A
By subtracting 100 from the speed and adding 50 to the coded direction.✓ Correct Answer
B
In the format of three-digit direction and three-digit speed.
C
This range is required to be annotated in plain language.
Explanation
In the winds and temperatures aloft forecast, speeds of 100 to 199 knots are coded by adding 50 to the two-digit direction and subtracting 100 from the speed; for example 7315 means 230 degrees at 115 knots. There is no three-digit speed field or plain-language annotation.
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