The Weather Blog

July 11, 2009|By FRANK ROYLANCE | FRANK ROYLANCE,frank.roylance@baltsun.com

Donald Gansauer in Canton hears "a lot of static on WBJC on occasional evenings. What is it about the atmosphere that causes AM/FM radio reception to go bad?" AM signals are vulnerable to electrical discharge (lightning) in thunderstorms. On FM, temperature inversions (warm air trapped above cold) can bend radio waves, causing interference. It's more common in cities, or near large bodies of water.

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