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Tornado Vortex Signatures in Doppler radial velocity patterns
The most important phenomena associated with severe convection are tornadoes. When a tornado is present, it is usually small enough that it fits within one or two beam widths.

Oldest known photograph of a , 1884.
The United States experiences by far the most es of any country, and has also suffered the most intense ones.

'Tornado alley' claims average 80 lives every year
The plains of the central United States are no strangers to tornadoes.

The picture below is said to be the oldest known photo of a twister. It was taken 22 miles southwest of Howard, South Dakota on August 28, 1884. The photographer is unknown.

The afternoon of 2 February 1918 was humid and unsettled in Melbourne, with a slow-moving low pressure trough crossing Victoria. As the trough approached, heavy thunderclouds built up. About 4.

- A violently rotating narrow column of air in contact with the ground and extending from a thunderstorm base. The is most often found in the southwest quadrant of the storm, near the trailing edge of the cumulonimus cloud.

Tornado: A violently rotating column of air, a vortex, formed in a thunderstorm which is in contact with both the parent cloud and the ground with a diameter between tens and hundreds of metres.

Family - A series of es produced by a single supercell, resulting in damage path segments along the same general line.

Tornado Watch- A Tornado Watch outlines an area where large hail and damaging wind threats, as well as the possibility of multiple tornadoes are possible.

es often form in the hot, humid weather of a late spring or summer afternoon. The thunderstorms that produce es frequently develop in the warm, moist air near the fronts or transition zones between warm and cold air masses.

A funnel-shaped whirlwind which extends to the ground from storm clouds
Tropics ...

: A violent rotating column of air, in contact with the ground, pendant from a cumulonimbus cloud. A does not require the visible presence of a funnel cloud.

TORNADO A violently rotating column of air in contact with and extending between a convective cloud and the surface of the earth. It is the most destructive of all storm-scale atmospheric phenomena.

Vortex Signature
An image of a on the Doppler radar screen that shows up as a small region of rapidly changing wind speeds inside a mesocyclone.

tornado: small mass of air that spins rapidly about an almost vertical axis and forms a funnel cloud that contacts the ground. Comes down from a cumulonimbus cloud and is considered probably the most destructive of all weather systems.

- A appears as a violent funnel-shaped wind vortex in the lower atmosphere with upward spiralling winds of high speeds - spawned by severe thunderstorms. The usually appears from a bulge in the base of a cumulonimbus cloud.

(Twister) A violently rotating storm of small diameter; the most violent weather phenomenon. It is produced in a very severe thunderstorm and appears as a funnel cloud extending from the base of a Cumulonimbus to the ground.

The cyclone of the temperate regions, the and the hurricane are all vortex-like low-pressure areas, but of very different character.

Tornado An intense, rotating column of air that protrudes from a cumulonimbus cloud in the shape of a funnel or a rope and touches the ground. (See Funnel cloud.) ...

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TORNADO - A violent rotating column of air, usually forming a pendant from a cumulonimbus cloud with the circulation reaching the ground. It nearly always starts as a funnel cloud and may be accompanied by a loud roaring noise.

alley - Region of maximum frequency in North America; a corridor stretching from central Texas northward into Oklahoma, Kansas and Nebraska, and eastward into central Illinois and Indiana, ...

Tornado Warning
A warning issued by Environment Canada's Meteorological Service (MSC), when at least one tornado is imminent, as indicated by observations, reports and/or radar scans.
Tornado Warning (Marine) ...

(sometimes called cyclone, twister)—A violently rotating column of air, pendant from a cumulonimbus cloud, and nearly always observable as “funnel-shaped.

Tornado A twisting, spinning funnel of low pressure air. The most unpredictable weather event, tornadoes are created during powerful thunderstorms. As a column of warm air rises, air rushes in at ground level and begins to spin.

Alley- The area of the United States in which es are most frequent. It encompasses the great lowland areas of the Mississippi, the Ohio, and lower Missouri River Valleys.

Tornado A rapidly whirling funnel-shaped cloud that reaches down from a storm cloud to touch earth's surface, usually leaving a destructive path
Add Cards ...

Warning - Issued to warn the public, emergency management and other cooperating agencies when a is forecast to occur or is occurring. The warning will include where the storm was occurring and its direction of movement.

TVS- Tornado Vortex Signature
TWEAK- To change slightly. Often in reference to slightly changing MOS output or any other form of model guidance.
UA- Upper Air ...

: Extension of the base of a Cumulonimbus cloud, in the form of funnel, which, circulating fast, goes down to the surface of the Earth, where it produces as strong whirlwind capable of causing great destruction.

TORNADO: A violent rotating column of air, extending from the base of a cumulonimbus cloud to the ground, producing damaging winds up to 300 mph.

- A violently rotating column of air that reaches from the base of a cloud to the ground.
Tropics- The area of the globe from latitudes 23.5 degrees north to 23.5 degrees south.

Lines of thunderstorms,
Embedded thunderstorms, and/or
Hail greater than or equal to 3/4" in diameter.

- It begins as a funnel cloud with spinning columns of air that drop down from a severe thunderstorm. When they reach the ground they become es.

TORNADO - A region of rotation extending from the base of a thunderstorm or other convective cloud to the earth's surface. This is a vortex, or wind velocity field, with a speed of at least 40 MPH at the surface.

A Watch is issued by the Storm Prediction Center (SPC) in Norman, Oklahoma.

A tornado is a violently rotating column of air in a small range with huge power and extreme damage capability. The diameter of a tornado can range from tens of meters to several hundred meters. In average it is about 250 meters.

A -like rotating column of fire and smoke created by intense heat from a forest fire or volcanic eruption.

All tornadoes, and most other severe local windstorms, are assigned a single number from this scale according to the most intense damage caused by the storm.

Like a Warning, the Severe Thunderstorm Warning is issued by your National Weather Service Forecast Office (NWFO).

See also: See also: Storm, Weather, Thunder, Cloud, Thunderstorm

Meteorology  Tornadic activity  Tornado alley

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