Tornadoes

New Orleans has had 12 recorded tornadoes since official records began in 1950. If taken as an average it works out to about 1 tornado every 5 years.

There is nothing within our power. The best way to stop a tornado would be to cut off the supply of warm air feeding the mesocyclone, possibly by introducing several cubic miles of cold air. A hurricane might be reduced to non-threatening levels by introducing a very large mass of dry air, on the order of tens of thousands of cubic miles.

The homes themselves are not so fragile, as the method of construction matters, not just the materials. The tornadoes that destroy homes in the Midwest are also easily capable of destroying brick homes as well. Even then, only a small percentage of homes, even in Tornado Alley, are ever hit by a significant tornado. Contrary to popular belief, most tornadoes do little more than break windows and peel roof tiles.

That said, many houses are not built as well as they should be. This is largely due to construction companies wanting to cut corners and build houses cheaply. The people buying the houses are not necessarily informed of structural deficiencies.

Probably not, though it probably can't be ruled out either. Typically, when a moderate risk outlook has been issued, the previous outlook had a relatively large area under a higher degree of slight risk (such as a 10% outlook for tornadoes). The 10% tornado outlook in this case is not that large, but again, an upgrade to the outlook probably can't be ruled out.

That said, even if a moderate risk outlook is not issued, the SPC has mentioned the potential for strong tornadoes, and violent tornadoes have occurred under similar circumstances.

SPC outlooks should be taken with a grain of salt, as a slight variation in weather conditions can make a significant difference in how an event will play out.

Generally speaking, it is a terryfying experience.

Yes, every year dozens of people are killed by tornadoes. Most tornado deaths are from people being struck by flying debris or crushed under falling objects. Less often people are picked up and thrown by the winds.

A tornado does not cause a natual disaster. A tornado is a natural disaster. The Oklahoma City area has been hit by many tornadoes, and is likely the most tornado-prone city in the world. Many of the tornadoes that occur in central Oklahoma are extremely powerful, capable of tearing apart well-built houses. When such a tornado moves through a mighly populated area such as Oklahoma City, the damage can be incredible. In the worst case, on May 3, 1999 thousands of homes were destroyed, hundreds were injured, and dozens were killed by a single F5 tornado. A similar event, though not quite as deadly, struck on May 20, 2013.

A 2 percent tornado probability typically means that isolated and probably weak tornadoes are possible.

Indiana experiences more tornadoes.

Yes. North Carolina gets both tornadoes and hurricanes.

Not directly. Cool, dry air meeting warm, moist air creates what is called a front. Fronts such as this frequently cause showers and thunderstorms. If other conditions are right, most importantly the speed and direction of the wind at different altitudes, then some of the thunderstorms will be able to produce tornadoes.

If your house is hit by the full force of an F4 (now EF4) tornado it will probably be completely leveled. Even if you escape the worst of it (which can be surprisingly likely depending on the tornado) there will still likely be severe damage. The best place to be in an event like this, or any tornado, is in a storm cellar or basement.

Only to a limited degree. There are two levels of tornado forecasting: long-term and short-term. In long-term forecasting, scientists rely on regional weather patterns and computer models to find regions that will be at risk, usually over a period of a few hours. These forecasts can be made up to a few days in advance, and become more accurate as the predicted event draws closer. Long-term forecasts can asses the general tornado risk in a region on a given day, but cannot tell where or when individual tornadoes will touch down.

Short-term forecasts use Doppler radar and eyewitness reports to track thunderstorms that may produce tornadoes. These predictions are made on time scale measured in minutes. They can provide warnings for specific locations, but cannot predict exactly when a tornado will form.

No. There have been no F5 tornadoes recorded in or near Ada.

It is not known at this point as of February 10. Worldwide records are not available as most countries do not keep records. In the United States there was a tornado outbreak on February 10, the extent of which is not yet known. It will take at least a few days to survey the damage and determine how many tornadoes there were.

For events prior to the February 10 outbreak, there have been at least 66 confirmed tornadoes in the U.S.

Lincoln, Nebraska does not get tornadoes every year. Since official records began in 1950 there have been 5 recorded tornadoes in Lincoln, Nebraska in total.

Yes. A high-risk outlook does not need to be issued just on account of tornadoes. One case of a severe thunderstorm watch during a high-risk outlook came on June 12, 2013.

Tornadoes usually form from a type of thunderstorm called a supercell. Tornadoes themselves are a unique type of windstorm.

The deadliest tornado outbreak in U.S. history was the one which produced the Tri-State tornado on March 18, 1925. As a whole the outbreak killed 747 people, 695 in the devastating Tri-State tornado, the deadliest single tornado in U.S. history. The F5 tornado cut a 219 mile long damage path through 13 counties in Missouri, Illinois, and Indiana.

People can reduce damage from tornadoes somewhat by reinforcing the connections between roofs and walls and between walls and foundations. Building houses with hip roofs rather than gabled roofs also helps.

Nebrasaka is part of a region called Tornado Alley, which has an ideal climate setup for tornadoes. In the spring storm systems cause warm, moist air from the Gulf of Mexico to collide with cool air from Canada and dry air from the Rockies, resulting in the formation of strong thunderstorms. About a mile off the ground a layer of stable air holds thunderstorm activity back, allowing instability to build underneath it. As a result when the storm break through the cap the instability will be enormous, leading to explosively powerful thunderstorms. At the same time wind speed and direction varies with altitude, which sets these storms rotating and also strengthens the updraft. This rotation combined with strong thunderstorm updrafts can then produce tornadoes.

When cold air runs into warm air on a large scale it forms a cold front. If the warm air mass is unstable enough this can trigger thunderstorms, potentially strong ones. Given a few other conditions these storms can begin to rotate and produce tornadoes. Most strong thunderstorms are associated with cold fronts.

However, another significant source of tornadoes. This is a similar scenario to a cold front, only there is a dry air mass pushing into a moist one with little temperature difference. A dry line is even more effective at producing tornadoes than a cold front.

In most cases tornado and hurricane winds actually fall into the same range. However, violent tornadoes have stronger winds than even the strongest hurricanes can produce.

Tornadoes are most often spawned by a type of storm called a supercell.

Tornadoes in the U.S. are rated on the Enhanced Fujita scale (or the original Fujita scale fore tornadoes Prior to February 2007), which runs from EF0 at the weakest to EF5 at the strongest. Ratings are based on wind speed estimates derived from the severity of the damage done. About 60% of tornadoes are rated EF0.