Sky and SpaceSky and Space

Severe WeatherSevere Weather

Thunderstorm Thunderstorm frequencyfrequency

LightningLightningphotos: noaaphotos: noaa

Thunderstorms near Sao Thunderstorms near Sao Paulo, BrazilPaulo, BrazilPhoto:chabotspace.orgPhoto:chabotspace.org

Photo:Photo: blackhillsweather.comblackhillsweather.com

Multi-cellMulti-cell

Photo: NSSLPhoto: NSSL

SupercellSupercellphoto: NSSLphoto: NSSL

MesocycloneMesocyclone

2-6 miles across2-6 miles across

TornadoesTornadoes

TornadoesTornadoesteacher.scholastic.comteacher.scholastic.com

Photos: noaa, weathernotebook.orgPhotos: noaa, weathernotebook.org

WaterspoutsWaterspouts

Mechanicville, NYMechanicville, NY

MechanicvilleMechanicville

March 12, 2006 - March 12, 2006 - KansasKansas

When?When?Photo: nsslPhoto: nssl

Tornado frequencyTornado frequency

Steps in Formation of Steps in Formation of Tornado Tornado (nssl:noaa)(nssl:noaa)

Fujita ScaleFujita Scaletornadoproject.comtornadoproject.com

HurricanesHurricanes

Northern Northern vs. vs. Southern Southern HemispherHemispheree

Hurricane TrackingHurricane Tracking

1 > 74 mph1 > 74 mph5 > 155 mph5 > 155 mph