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I noticed this one day, a lightning/thunder occurred and my Fabulosa Spanish music died for a second. But not FM?

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Did you have FM and AM radios playing simultaneously to make that observation? –  Michael Luciuk Jul 15 '11 at 21:35
    
LOL I knew someone would ask that! Well, not really. I just switched to FM after that happened, then life was easycheesy :) –  Adel Jul 15 '11 at 21:37

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up vote 8 down vote accepted

AM radio typically transmits at around 1 MHz, FM radio at about 90 MHz. Measurements of the RF spectrum of lightning strikes show a falloff with frequency of about 20 dB per decade in that frequency range, so with FM about 2 decades above AM, you'd expect AM to have about 40dB higher interference from a lightning strike. In addition to that, FM signals attenuate faster with range, so depending on your distance from the lightning strike the effective AM/FM interference ratio could be even larger.

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That's really cool, very informative and thorough answer! Thank You, –  Adel Jul 15 '11 at 22:47

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