![]() ![]() CHI is the most common cloud measurement device used at airports today, and with technological advances, it will soon allow cloud measurements up to 24,000 feet. CHI is normally limited to 12,000 feet of altitude, which is why you'll sometimes see "clear below 12,000 feet" in a weather report. You can think of CHI like radar the round trip time for the beam to return once hitting a cloud layer determines cloud height. 3) Cloud Height Indicator (CHI) Sensors use vertically pointing lasers (LIDAR) to measure cloud heights.
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