VIOLENTLY ROTATING COLUMNS TORNADOES TORNADO DEFINED COLUMN CONTACT THE GROUND PENDENT CUMULONIMBUS CLOUD PHOTOGRAPH MARSHALL CATEGORIZED WEAK WIND SPEEDS GREATER THAN WEST STRONG POPULARLY CLASSIC CLOUD WHIRLING 200 MPH NSSL NEARLY TWISTER NORTH LOOKING NORTHEAST NOTE SPIRALING INFLOW PROBABLY TAIL FEEDING SAFETY CONSIDERATION DEFINITION DO NOT LEVEL SHELTER ALMOST PERCENT DIRECT VIOLENT LEVELING SOLIDLY LESS THAN REACH PRODUCE DAMAGE VERY SMALL OVERALL HOMES WICHITA TEXAS MASSIVE SOUTH WALL CLOUD ABOVE FEATURE CLOSE SIZE LOCATION PARENT MESOCYCLONE ASSOCIATION MESOCYCLONES INTENSE EVENTS THE THUNDERSTORM WALL CLOUDS TERMS DATA CREDITS DEPARTMENT OF ATMOSPHERIC SCIENCES UNIVERSITY OF ILLINOIS AT USEFUL