what was the first tornado upgraded to tropical hurricane?
May 22, 2010
in
Tornado
how strong a tornado has to be to become a tropical named storm and start deep convection? when does it get an eye? how deep is the mesocyclon?
when it gets to water, it becomes a water sprout, but when they start to issue hurricane warnings, how string has the water sprout to be to develop an eye and become a named storm
conversely, what processes cause hurricane to degenerate into simple single mesocyclonic tornado when they touch land
do hurricanes retain their names once they become a simple tornado and become extratropical
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3 comments
stl_luna_7 on May 22, 2010 at 12:29 am
That has never happened. Hurricanes begin with a cluster of thunderstorms and start in the Atlantic Basin or Gulf of Mexico. Hurricanes will never downgrade to a tornado but Hurricanes can spawn dozens of tornadoes. If a tornado manages to make it to sea, it will become a waterspout and usually the weight of the water is enough to cause the storm to dissipate…
http://www.erp.oissel.onac.org/anglais/hurricanestornadoes.htm
tentofield on May 22, 2010 at 12:29 am
A tornado is a vortex generated by a severe thunderstorm. The storm might be ten to twenty kilometres across and the tornado just a hundred metres more or less in diameter.
A hurricane/typhoon/tropical cyclone is a synoptic scale event that could be up to 500kilometres in diameter. There are many thunderstorms in a hurricane. Hurricanes and tornados are very different although both can cause great damage.
By the way, a tornado over the water is a water spout, not a sprout.
raspberryroses on May 22, 2010 at 12:29 am
I’m not a forecaster, but a tropical hurricane and a tornado are not the same thing; a hurricane does not necessarily spawn tornadoes. A hurricane evolves from an area of significant low pressure. It must have a large source of moisture, such as an ocean, and it must "hold together", or become and stay organized; that is, the area of low pressure must be able to extend into the upper airstream as opposed to staying localized to the surface. That’s why the eye of a hurricane can be seen on satellite photos, it extends from the surface to a significant height above the ground. If the column of low pressure is sheared off in the stratosphere, it will not become a hurricane, or it will dissipate to a tropical storm or depression (area of low pressure).