Tornadoes. Tornado Formation. Severe “Super Cell” Thunderstorm (1% spawn tornadoes) Often occur along cold fronts and move to NE Strong updrafts Wind shear (change in direction or strength of winds from top to bottom of storm). Funnel Cloud v. Tornado. Tornado. Funnel Cloud.
Most common when temperature gradient in central U.S. is greatest.
Largest Tornado Outbreak