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Could mystery sounds help to predict storms?

Dallas reels from severe tornado strike

Texas tornado strike caught on camera. Video, 00:00:54Texas tornado strike caught on camera

North West hit by tornado. Video, 00:00:28North West hit by tornado

US tornado blows car into home killing man

Extreme weather hits Ohio's Dayton. Video, 00:00:31Extreme weather hits Ohio's Dayton

Extreme weather hits Ohio's Dayton. Video, 00:00:31Extreme weather hits Ohio's Dayton

Fatal Oklahoma tornado aftermath. Video, 00:00:35Fatal Oklahoma tornado aftermath

Oklahoma tornado kills two in El Reno

Aerial shots show tornado destruction. Video, 00:00:43Aerial shots show tornado destruction

Killer tornado hurls US elderly couple from home

Several tornadoes spotted in US Midwest

'Twin tornadoes' spotted in Oklahoma. Video, 00:01:15'Twin tornadoes' spotted in Oklahoma

Violent tornadoes to hit parts of the US. Video, 00:01:38Violent tornadoes to hit parts of the US

More severe weather for USA. Video, 00:01:12More severe weather for USA

Tennis ball-sized hail hits Great Plains. Video, 00:00:34Tennis ball-sized hail hits Great Plains

'Monster tornado' hits Romania and overturns bus

Eight dead after tornadoes hit US South

Texas tornado: 'It looked like a bomb had gone off' Video, 00:00:39Texas tornado: 'It looked like a bomb had gone off'

Why tornado chasers are facing a storm over safety

TV channel sued over storm chase death

Three tornado chasers die in Texas crash

Seven family members die in US tornadoes