weather servicesFAA-published sample question (ADX, Aug 2021)
If squalls are reported at the destination airport, what wind conditions exist?
A
Sudden increases in wind speed of at least 15 knots to a sustained wind speed of 20 knots, lasting for at least 1 minute.
B
Rapid variation in wind direction of at least 20° and changes in speed of at least 10 knots between peaks and lulls.
C
A sudden increase in wind speed of at least 16 knots, the speed rising to 22 knots or more for 1 minute or longer.✓ Correct Answer
Explanation
A squall (SQ) is defined as a sudden increase in wind speed of at least 16 knots, with the speed rising to 22 knots or more and lasting at least 1 minute. The other definitions do not match the squall criteria; the variations in direction and peak/lull describe variable or gusty winds.
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