Chapter 18 - Tornadoes

3 May 1999 radar animation

http://severewx.atmos.uiuc.edu/18/050399.reflectivity.html

Velocity animation

http://severewx.atmos.uiuc.edu/18/050399.velocity.html

Fujita Scale

http://ivis.eps.pitt.edu/courses/hazards/lectures/19.pdf

Low Level Jet

Mesocyclone #1

Mesocyclone #2

Mesocyclone #3

Weak Convergence along Forward-Flank Reflectivity

Gradient

Courtesy: Jeff Beck (TTU)

Cyclic supercell pics

RFGF RFGF

meso meso

New

New

New

Occluded

Occluded

Cherokee, OK4/14/12

Occluded

Dumas, TX – VORTEX2 2010

Tornadogenesis During VORTEX2 (Limon, CO 6/11/2010)

Tornado Structure

* Very strong near-surface radial inflow

* Sharp transition to upward motion in center of vortex (corner region)

* May develop two-celled structure (descent in center of vortex) – immediately precedes multiple vortex structure

In-situ pressure measurements of a tornado