ðə hˈaɪɪst lˈɛvəlz ʌv ɹˈeɪdɑːn ɪn ɹˈeɪnwɔːɾɚɹ əkˈɜːz dˈʊɹɹɪŋ θˈʌndɚstˌoːɹmz, ænd ɪɾ ɪz haɪpˈɑːθəsˌaɪzd ðæt ɹˈeɪdɑːn ɪz kˈɑːnsəntɹˌeɪɾᵻd ɪn θˈʌndɚstˌoːɹmz ˌɔn ɐkˈaʊnt ʌvðɪ ˈæɾəmz pˈɑːzᵻtˌɪv ᵻlˈɛktɹɪkəl tʃˈɑːɹdʒ.
The highest levels of radon in rainwater occurs during thunderstorms, and it is hypothesized that radon is concentrated in thunderstorms on account of the atom's positive electrical charge.