The Weather Blog

July 16, 2009|By FRANK ROYLANCE | FRANK ROYLANCE,frank.roylance@baltsun.com

Richard Lelonek, in Baltimore, saw last week's comments on how thunderstorms and temperature inversions can cause static and interference on AM and FM radio. "How about digital transmissions of TV signals?" he asks. Brief "dropouts" and pixelation of weak digital TV broadcast signals can be caused by urban "heat island" effects - rising plumes of hot air over city streets and rooftops.

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