Indicated airspeed increase near clouds

From: (Acgales)
Organization: America Online, Inc. (1-800-827-6364)
Date:         12 Oct 96 02:36:05 
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I'm a new boy to turboprops; I have been warned about, and observed,
roughly a 10 knot increase in IAS when descending in an ATR-42 as it
approaches clouds.

Does anybody have an explanation for this phenomenon?


Tony Gales