USA Tornadoes

Tornadoes - FEMA - Tornadoes Center


 
 
 
Search for hurricanes, tornadoes, floods, earthquakes, tidlewaves, and disasters worldwide.

The land in the central United States is the best breeding ground for the storms which produce tornadoes. The land in the Great Plains is relatively flat, which allows cold dry polar air from Canada to meet warm moist tropical air from the Gulf of Mexico. It's along the front between the two air masses that most tornadoes form.

Most tornadoes in the United States form in an area called "Tornado Alley". This area includes parts of Texas, Oklahoma, Kansas, and Nebraska. Storm chasers travel to this area because of the high concentration of tornadoes. These tornadoes are formed by thunderstorms. Some of the tornadoes in the southern states such as Florida, South Carolina, and Georgia are caused by hurricanes.

Georgia, Idaho, Indianna, Ohio, Kentucky, Alabama, Virginia, Texas, Louisiana, Florida Killer tornadoes, National Weather Sevice, National Tornadoes Service, Tornado news, National Tornado Center, Louisiana Homeland Security And Emergency Preparedness, Tornado Headquarters, FEMA Headquarters, FEMA Homeland Security. A tornado is a violent, dangerous, rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as a twister or a cyclone, although the word cyclone is used in meteorology in a wider sense, to name any closed low pressure circulation. Tornadoes come in many shapes and sizes, but are typically in the form of a visible condensation funnel, whose narrow end touches the earth and is often encircled by a cloud of debris and dust. Most tornadoes have wind speeds less than 110 miles per hour (177 km/h), are approximately 250 feet (80 m) across, and travel a few miles (several kilometers) before dissipating. The most extreme tornadoes can attain wind speeds of more than 300 mph (480 km/h), stretch more than two miles (3 km) across, and stay on the ground for dozens of miles (more than 100 km). Various types of tornadoes include the landspout, multiple vortex tornado, and waterspout. Waterspouts are characterized by a spiraling funnel-shaped wind current, connecting to a large cumulus or cumulonimbus cloud. They are generally classified as non-supercellular tornadoes that develop over bodies of water. These spiraling columns of air frequently develop in tropical areas close to the equator, and are less common at high latitudes. Other tornado-like phenomena that exist in nature include the gustnado, dust devil, fire whirls, and steam devil. Tornadoes have been observed on every continent except Antarctica. However, the vast majority of tornadoes in the world occur in the Tornado Alley region of the United States, although they can occur nearly anywhere in North America. They also occasionally occur in south-central and eastern Asia, the Philippines, south east Asia, like Malaysia, northern and east-central South America, Southern Africa, northwestern and southeast Europe, western and southeastern Australia, and New Zealand. Tornadoes can be detected before or as they occur through the use of Pulse-Doppler radar by recognizing patterns in velocity and reflectivity data, such as hook echoes, as well as by the efforts of storm spotters. There are several different scales for rating the strength of tornadoes. The Fujita scale rates tornadoes by damage caused, and has been replaced in some countries by the updated Enhanced Fujita Scale. An F0 or EF0 tornado, the weakest category, damages trees, but not substantial structures. An F5 or EF5 tornado, the strongest category, rips buildings off their foundations and can deform large skyscrapers. The similar TORRO scale ranges from a T0 for extremely weak tornadoes to T11 for the most powerful known tornadoes. Doppler radar data, photogrammetry, and ground swirl patterns (cycloidal marks) may also be analyzed to determine intensity and assign a rating.

Louisiane Tornadoes - Louisiana Floods - Texas Tornadoes - Texas Floods - Florida Tornadoes - Florida Floods


A hurricane is a tropical cyclone, which generally forms in the tropics and is accompanied by thunderstorms and a counterclockwise circulation of winds. Tropical cyclones are classified as follows:

TROPICAL DEPRESSION
An organized system of clouds and thunderstorms with a defined surface circulation and maximum sustained winds* of 38 mph or less

TROPICAL STORM
An organized system of strong thunderstorms with a defined surface circulation and maximum sustained winds of 39-73 mph

HURRICANE
An intense tropical weather system of strong thunderstorms with a well-defined surface circulation and maximum sustained winds of 74 mph or higher

What Are The Hurricane Hazards?

STORM SURGE - is water that is pushed toward the shore by the force of the winds swirling around the storm. This advancing surge combines with the normal tides to create the hurricane storm tide, which can increase the mean water level 15 feet or more.
INLAND FLOODING - In the last 30 years, inland flooding has been responsible for more than half the deaths associated with tropical cyclones in the United States.
HIGH WINDS - Hurricane-force winds can destroy poorly constructed buildings and mobile homes. Debris such as signs, roofing material, and small items left outside become flying missiles in hurricanes.
TORNADOES - Hurricanes can produce tornadoes that add to the storm's destructive power. Tornadoes are most likely to occur in the right-front quadrant of the hurricane.
A section of the Great Plains in the central part of the United States is called "Tornado Alley". This is because more tornadoes form here than any other part of the country. The plains are flat which allows cold polar air from Canada to meet warm tropical air from the Gulf of Mexico.

Storm chasers go Tornado Alley looking for tornadoes because there are so many that form there.
Tornado alley
 Tornadoes have hit all fifty states of the United States, but the 30-year average number of tornadoes per year in Alaska is closer to zero than to one. In Oklahoma though the average jumps to 52. Although no state is immune for tornadoes, there is an area that suffers from more tornadoes than any other. This area is called Tornado Alley. It is stretched out from West-Texas to North-Dakota. That is 1600 kilometres from north to south and 950 kilometres from east to west. Because it is not an official area the areas that are counted for can vary. What is certain is that large pieces of Texas, Kansas and Nebraska are a part of it. These areas suffer from more tornadoes than any other state in the United States.
 
 

Louisiana Tornado - Louisiana Floods - Texas Tornado - Texas Floods - Florida Tornado - Florida Floods


 
 

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