May 11, 2015 ... The fierce storms can happen at any time of year but are most common ... This
happens when air descending from the supercell causes rotation near the
ground. Even then, "we still don't know why some thunderstorms create
tornadoes while others ... "We don't understand how tornadoes die," Brooks say...
Tornadoes can occur in every state in the United States, on any day of the year,
and at any hour. ... When typically form when the following happens: increasing
rainfall causes ... Atmospheric scientists still don't know exactly how tornadoes
form. ... effect, but concentrated somehow, but I'm pretty sure we don't exactly
Tornadoes are the most violent of all atmospheric storms. ... Since official tornado
records only date back to 1950, we do not know the actual average number of ...
The most common and practical way to determine the strength of a tornado is to
look at the damage it caused. ... The truth is that we don't fully understand.