intense vortex usually appearing funnel shaped cloud occurs body water connected cloud cloud common form non tornado water weaker land counterparts stronger versions spawned occur suck water small weak rotating columns air water form tropics subtropical areas areas report including europe new_zealand great lakes antarctica rare observed connection lake effect snow precipitation bands life cycle formation dark spot water surface spiral pattern water surface formation spray ring development visible funnel ultimately decay formation exist environment kilometers width cloud develop moderate great strong nature weaker caused different atmospheric dynamics normally develop moisture laden environments parent clouds process development spin surface boundary horizontal shear near surface stretch upwards cloud low level shear vortex developing cloud thunderstorm weak tornadoes known shown develop similar manner occur vicinity time simultaneous reported lake michigan types non associated rotating thunderstorm known non fair weather far common type fair weather occur coastal waters associated dark flat developing convective towers type rapidly develop dissipate having life cycles shorter minutes usually rate higher scale generally exhibiting winds mph frequently seen tropical sub tropical climates upwards year observed florida keys typically slowly cloud attached horizontally static formed vertical convective action instead interaction fronts fair weather similar appearance mechanics largely behave ashore accurately referred tornadoes water formed action manner essentially identical traditional land based tornadoes connection severe thunderstorms simply occurring water tornado travels land body water considered vast majority thunderstorms occur land locked areas united_states true fair weather counterparts country areas adriatic seas half total number winter known snow devil ice devil extremely rare instance forming base snow term winter differentiate common warm season rare winter season event little known phenomenon known pictures event exist date taken ontario canada couple critical criteria formation winter cold temperatures need present body water warm produce fog resembling steam water surface like efficient lake effect snow events winds focusing axis long lakes enhance wind convergence likely enhance development majority occur tropics appear temperate areas world common western coast europe british isles areas mediterranean baltic_sea restricted reported lakes rivers including great lakes fairly common great lakes late summer early fall record reported seven day period frequent kilometers coast farther sea common southeast coast especially southern florida keys happen seas bays lakes worldwide approximately currently reported year europe netherlands reporting followed spain italy united_kingdom common late summer september prime month formation frequently observed east coast australia described voyage life cycle stages life cycle initially prominent circular light colored disk appears surface water surrounded larger dark area shape formation colored water pattern light dark colored spiral bands develop dark spot water surface dense sea spray called cascade appears dark spot appears eye eventually visible funnel water surface overhead cloud spray vortex rise height feet creates visible wake associated wave train moves eventually funnel spray vortex begin dissipate warm air vortex ending life cycle nautical threat long recognized marine hazards stronger pose threats aircraft people recommended considerable distance phenomena alert weather reports issue special marine warnings likely sighted coastal waters tornado warnings expected onshore incidents causing severe damage casualties rare notable examples malta tornado earliest record deadly struck sinking numerous boats claiming hundreds lives sicily tornadoes twin landfall western sicily coast countryside ultimately dissipating sea animal threat depending fast winds yard surface water including fish different sizes frogs turtles lifted air suck small animals fish water way cloud stops spinning fish cloud carried land cloud winds currents longer flying fish atmosphere depending far travel high taken atmosphere fish dead time rain people far miles inland experienced fish fish rivers fish common weather phenomenon research index index developed canadian predict conditions favorable development ranges values greater equal zero represent conditions favorable development international centre research non governmental organization individuals world interested field research operational safety perspective originally forum researchers expanded interest contribution storm media marine aviation communities private individuals
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