Tornadoes
These may develop under a shower visible by dust or moist but they can be invisible too when the air is dry under the convective condensation level.
tornadoes
Tornadoes are one of nature's most violent storms. In an average year, about 1,000 tornadoes are reported across the United States, resulting in 80 deaths and over 1,500 injuries.
Tornado: A violent whirling windstorm of small radius which advances over land while circling round its centre. Strong ascending currents of air form in the region of a tornado.
Tornado, F-111, F-15E
TIALD - Thermal Imaging And Laser Designator - as used by UK forces on Harrier, Jaguar and Tornado aircraft
Toss - A modern method of delivering a PGM bomb or missile on target without having to overfly the target.
WAKE TURBULENCE Turbulent air condition caused by small, tornado-like horizontal whirlwinds trailing an aircraft's wingtips (wingtip vortices).
tornadoes
precipitation that is not in the form of rain or snow, such as hail, ice pellets and snow grains
multiple forms of precipitation falling at the same time
depth of new snowfall
total snow depth
in-cloud and cloud-to-cloud lightning ...
Convective SIGMETs are issued for tornadoes, lines of thunderstorms, embedded thunderstorms of any intensity level, areas of thunderstorms greater than or equal to VIP level 4 with an area coverage of 4/10 (40%) or more, and hail 3/4 inch or greater.
Regarding flying for a living, well, unless you're a cargo pilot flying a small airplane in Tornado Alley, ...
These messages define areas of possible severe thunderstorms or tornado activity. The messages are unscheduled and issued as required by the National Severe Storm Forecast Center at Kansas City, Missouri.
Convective SIGMET. Weather advisory concerning convective weather significant to the safety of all aircraft, including thunderstorms, hail, and tornadoes.
Related Definitions from Aviation Glossary ...
SIGMETs are of operational importance to even large transport aircraft, and generally highlight conditions like observed thunderstorm systems (including tornadoes) and areas of reported or forecast severe icing.
must be severe or greater icing, turbulence, or instrument conditions due to dust covering a 3000 square mile area provided its not caused by thunderstorms or the presence of volcanic ash. In Hawaii or Alaska SIGMET's are also issued for Tornadoes, ...
 See also: Aircraft, Aviation, Power, Flight, Force
  
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