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Thunder Brings Cold
Question: I have heard a weather proverb that states:
Thunder in spring,
Is there any truth in it?
Answer: In most areas of the middle latitudes, there is a general truth in this saying. Early in spring, before the ground has had a chance to warm from the winter's frosting, most thunderstorms are the result of the approach of a cold front moving across the region.
A spring cold front often has enough vertical uplift to the warmer air before it to produce thunderstorms. Thus, when a cold front pushes thunderstorms toward the observer, it is reasonable to assume that the warm air will soon be replaced by substantially colder air At times, such cold fronts can bring snow showers amid the thunder: a situation known as thundersnow.
In contrast, in the later spring and summer when vigorous cold fronts are uncommon,, thunderstorms result from the strong heating of the ground by the sun. The passage of such storms do not have the sharp temperature contrast of the early spring storm, except for the brief respite of the cooling winds and rains associated with the thunderstorm.
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