During thunderstorms the record from an electrograph shows large sudden excursions, the trace usually going off the sheet with every flash of.
The number of thunderstorm days is probably a less exact measure of the relative intensity of thunderstorms than statistics as to the number of persons killed annually by lightning per million of the population.
The frequency and intensity of thunderstorms are unquestionably greater in the Rocky Mountain than in the New England states, but the difference is not so great as the statistics at first sight suggest.
Even at the same place thunderstorms vary greatly in intensity and duration.
[[Table Xii]].-Diurnal Variation of Thunderstorms. centages.
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