And rebuilding after the floods and tornadoes may deliver a fillip in the second half of the year.

而且洪水以及龙卷风后重建也可以刺激下半年的经济。

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Meteorologists believe this pressure jump is the mechanism responsible for storms and tornadoes.

气象学家认为这一气压的突然升高是暴风雨和飓风形成的物理机制。

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Then, as the snow melted, floods ravaged Arkansas, Mississippi, Missouri and Tennessee, and tornadoes battered Alabama and Missouri.

后来，由于冰雪融化，洪水袭击了阿肯色、密西西比、密苏里、田纳西，而且阿拉巴马和密苏里也遭遇龙卷风。

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The National Weather Service said there were ten reports of tornadoes across the central and southern Plains states last Thursday.

VOA: special.2011.04.19

The goal of the project is to examine in detail how tornadoes are formed and the kinds of damage they cause.

VOA: special.2010.05.11

They are hoping to surround tornadoes in the second and final year of an international project known as VORTEX2.

VOA: special.2010.05.11

Flash flooding and tornadoes killed three people in Arkansas late Thursday and early Friday.

NPR: 2 Dead When Tornado Hits Oklahoma City Area

The warm temperatures also contributed to conditions that were favorable for severe thunderstorms and tornadoes.

CNN: U.S. sees warmest March in recorded history, NOAA reports

The two storm measurement systems are similar in scale to the ones that measure hurricanes and tornadoes.

WSJ: The whopper of a storm didn't rank high in history