Spring begins in the northern hemisphere around the months of March, April, May, or as reckoned astronomically extending from the vernal equinox. As in summer, the axis of the Earth is tilted toward the Sun, and the length of daylight days rapidly increases as latitude increases. The northern hemisphere begins to warm significantly, causing new plant growth to "spring forth", giving the season its name. Snow begins to melt, and streams swell with runoff and spring rains. Most flowering plants bloom this time of year, in a long succession beginning even when snow is still on the ground, and continuing into early summer.
Severe weather most often occurs during the spring, when warm air begins to invade from lower latitudes while cold air is still pushing from the polar regions.
Umbrella, Trench, and cab tricks to follow.
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