Sentences with phrase «large numbers of tornadoes»

There have been notable events in recent years when large numbers of tornadoes hit a single area on the same day.

Not exact matches

While no significant trends have been found in either the annual number of reliably reported tornadoes or of outbreaks, recent studies indicate increased variability in large normalized economic and insured losses from U.S. thunderstorms, increases in the annual number of days on which many tornadoes occur, and increases in the annual mean and variance of the number of tornadoes per outbreak.

Last spring a research team led by Michael Tippett, associate professor of applied physics and applied mathematics at Columbia Engineering, published a study showing that the average number of tornadoes during outbreaks — large - scale weather events that can last one to three days and span huge regions — has risen since 1954.

«If you look at the history of significant tornado activity, there are a large number of outbreaks that occur in March and April,» Carbin told OurAmazingPlanet.

The number of tornadoes and large hail is expected to remain at the same level as today.

There's really no evidence to support an expectation of greater numbers of more intense tornadoes over a larger geographical range in the course of longer tornado seasons.

Can we expect greater numbers of more intense tornadoes over a larger geographical range in the course of longer tornado seasons?

Rather, the larger numbers come from improved detection and reporting of weak tornadoes, particularly EF0 tornadoes, where «EF» refers to the enhanced - Fujita scale used by the National Weather Service (NWS).