During the TEMPO period for CYXX, what is the forecast cloud base?

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Multiple Choice

During the TEMPO period for CYXX, what is the forecast cloud base?

Explanation:
Forecast ceilings are shown as a cloud amount (FEW, SCT, BKN, OVC) and a height in hundreds of feet above ground level. During a TEMPO period, these ceilings can temporarily change. An overcast layer with a base at 400 feet means the entire sky is covered with clouds whose base is only 400 ft above the ground, which is a very low ceiling and indicates a low-lying, full cloud deck. The other options describe higher bases (500 ft, 2000 ft, 3000 ft) and do not reflect the low, full coverage implied by TEMPO in this case. So the forecast cloud base is 400 ft AGL.

Forecast ceilings are shown as a cloud amount (FEW, SCT, BKN, OVC) and a height in hundreds of feet above ground level. During a TEMPO period, these ceilings can temporarily change. An overcast layer with a base at 400 feet means the entire sky is covered with clouds whose base is only 400 ft above the ground, which is a very low ceiling and indicates a low-lying, full cloud deck. The other options describe higher bases (500 ft, 2000 ft, 3000 ft) and do not reflect the low, full coverage implied by TEMPO in this case. So the forecast cloud base is 400 ft AGL.

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