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Precisely the right atmospheric conditions are required for the formation of even a weak tornado. Tornadoes can form in any month when conditions are favorable. [ 1 ] [ a ] 1,000 or more tornadoes a year are reported in the contiguous United States.
Here is a simplified explanation of how a tornado is formed during severe weather. What conditions are needed for a tornado to form? Here’s how one expert explains it.
A tornado is a violently rotating column of air in contact with the surface and a cumuliform cloud base. Tornado formation is caused by the stretching and aggregating/merging of environmental and/or storm-induced vorticity that tightens into an intense vortex. There are various ways this may come about and thus various forms and sub-forms of ...
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
The conditions that help them form are the same, but tornadoes come in all shapes and sizes. They can be narrow, rope-like swirls or large, wide funnels. How are tornadoes ranked?
An EF4 tornado with wind speeds ranging from 166 to 200 mph can cause devastating damage. Most to all walls on a well-built house will likely collapse, and high-rise buildings can sustain ...
A few hours later, an F5 tornado ripped through the southern suburbs of the city. Also on May 4, 2007, CAPE values of 5.5 kJ/kg were reached and an EF5 tornado tore through Greensburg, Kansas. On these days, it was apparent that conditions were ripe for tornadoes and CAPE wasn't a crucial factor.
When severe weather is anticipated, local weather service offices request these spotters to look out for severe weather and report any tornadoes immediately, so that the office can warn of the hazard. [citation needed] Spotters usually are trained by the NWS on behalf of their respective organizations, and report to them.