Weather warning indicating imminent danger of tornadoes
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F5 tornado near Elie, Manitoba, on June 22, 2007
A tornado warning (SAME code: TOR) is a public warning that is issued by weather forecasting agencies to an area in the direct path of a tornado, or a thunderstorm capable of producing one, and advises individuals in that area to take cover. Modern weather surveillance technology such as Doppler weather radar can detect rotation in a thunderstorm, allowing for early warning before a tornado develops. They are also commonly issued based on reported visual sighting of a tornado, funnel cloud, or wall cloud, typically from weather spotters or the public, but also law enforcement or local emergency management. When radar is unavailable or insufficient, such ground truth is crucial. In particular, a tornado can develop in a gap of radar coverage, of which there are several known in the United States.
A warning should not be confused with a tornado watch, issued in the United States by the Storm Prediction Center (SPC) and in other countries by applicable regional forecasting agencies or national severe weather guidance centers, which only indicates that conditions are favorable for the formation of tornadoes. Although a tornado warning is generally a higher alert level than a tornado watch, in the U.S., it can be surpassed by a higher-level alert—structured as wording that can be added to the official warning product—to warn the public of intense tornadoes affecting a densely populated area.
A tornado watch is not required for a warning to be issued; tornado warnings are occasionally issued when a tornado watch is not active (i.e. when a severe thunderstorm watch is active, or when no watches are in effect), if a severe thunderstorm develops and has a confirmed tornado or strong rotation.
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approach; the warning was put into effect for one hour. This was the first tornadowarning of the day issued for the office's warning area and warned...
likelihood of such happening. A watch must not be confused with a tornadowarning. A tornado watch indicates that atmospheric conditions observed in and close...
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used the tornado emergency bulletin, an unofficial, high-end classification of tornadowarning—sent through either the issuance of a warning or via a...
produced 20 tornadoes, mainly along the Interstate 35 corridor from northeast of Waco to north of San Antonio. The strongest tornado was an F5 tornado that leveled...
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National Weather Service, for tornado watches and eventually expanded to use for other severe weather watches and warnings by the agency's regional forecast...
minutes later, storm spotters reported a large tornado near Greenfield, prompting a PDS tornadowarning for portions of Poinsett, Craighead and Mississippi...
thunderstorm warning in an extreme derecho event. The only exception is that if the extreme winds are associated with a tornado, a tornadowarning (or more...
about imminent tornado development. A tornadowarning for the severe thunderstorm west of Joplin that eventually produced the EF5 tornado was first issued...
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extreme wind warning should not be confused with tornadowarnings, which covers rotating supercells from severe storms, and high wind warnings, which is...
disasters, such as tornadoes (tornado sirens). The generalized nature of sirens led to many of them being replaced with more specific warnings, such as the...
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death tolls in past tornado outbreaks due to the lack of advanced warning) until 1938, when it began disseminating tornadowarnings exclusively to emergency...
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