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Tornado - Wikipedia


A tornado is a violently rotating column of air that spins while in contact with both the surface of .... Most significant tornadoes form under the storm's updraft base, which is ... Night-time ...

Severe Weather 101: Tornado Basics


Because wind is invisible, it is hard to see a tornado unless it forms a ... Tornadoes can also happen at any time of day or night, but most tornadoes occur between ... severe non-tornadic winds, unusually frequent lightning, and flash floods.

Severe Weather 101: Tornado FAQ


Frequently asked questions about tornadoes, from the NOAA National Severe Storms ... to occur in every state in the United States, on any day of the year, and at any hour. ... wind speeds can be as high as 300 mph in the most violent tornadoes. ... Although the process by which tornadoes form is not completely understood, ...

Severe Weather 101: Thunderstorm Basics


Tornadoes (with winds up to about 300 mph) can destroy all but the best-built ... Three basic ingredients are required for a thunderstorm to form: moisture, rising ... The mature stage is the most likely time for hail, heavy rain, frequent lightning,  ...

I often hear the term "lift" - USATODAY.com


Q: Is there a specific time of day that most thunderstorms occur? .... those that produce 3/4" hail or larger, winds 58 mph or greater or tornadoes. .... Supercells are most common in the Great Plains and desert states of the USA, but they can form ...

Prepare for a Tornado | Weather Underground


Most tornadoes are abrupt at onset, short-lived and often obscured by rain or darkness. .... Tornadoes form under a certain set of weather conditions in which three very different types of ... Although they are possible any time of the day or night, tornadoes tend to occur in the late ... They are most common from 4pm to 9pm.

Tornadoes | Weather Wiz Kids


Most strong and violent tornadoes form within this area of strong rotation. ... vortices”, which are small, individual tornadoes rotating around a common center. .... Tornadoes can happen at any time of the year and at any time of the day.

Tornadoes - Weather Wiz Kids weather information for kids


Tornado How do tornadoes form? Most tornadoes form from thunderstorms. ... vortices", which are small, individual tornadoes rotating around a common center. ... Tornadoes can happen at any time of the year and at any time of the day. In the  ...

Tornadoes - About Tornadoes | Weather Underground


View More Tornado Photos ... Frequently Asked Question. Where do tornadoes most often occur in the United States? ... How do tornadoes form? ... However, tornadoes have occurred in every month and at all times of the day or night. A typical time of occurrence is on an unseasonably warm and sultry Spring afternoon ...

12 Twisted Tornado Facts - Live Science


Jun 18, 2009 ... Twelve facts about when, where and how tornadoes form, as well as ... Although tornadoes are more frequent in the afternoon, they can ... While tornado season — the time of year that historically produces the most tornadoes — runs ... 1974, when a two-day "Super Outbreak" of 147 tornadoes killed 308 ...

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The Online Tornado FAQ (by Roger Edwards, SPC)


Mar 29, 2016 ... Most thunderstorms that form under those conditions (near warm fronts, cold fronts and ..... The most common tornado sound is a continuous rumble, like a nearby train. ...... What are the time limits of a "tornado day" anyway?

7(t) Thunderstorms and Tornadoes - Physical Geography


Thunderstorms form when moist, unstable air is lifted vertically into the ... The most common type of thunderstorm is the air mass storm. .... F4 tornadoes occur only about 1% of the time, while F5 are even more rare with a ... Figure 7t-10: Average number of tornadoes per month and per hour of the day in the United States.

Night thunderstorms: Top things to know | Earth | EarthSky


Jul 27, 2015 ... Cloud-to-ground lightning might be common when thunderstorms happen after dark. ... during the warmest time of day, the “heat of the day,” from mid-day to late in the afternoon ... Tornadoes, however, are much more likely during the day, ... Thunderstorms are most likely to form when the temperature of the ...