FIGURE 10.25 A mature tornado with winds exceeding 150 knots rips through southern Illinois. Fig. 10-25, p.277

Fig. 10-31, p.283 Fig. 10-32, p.283

FIGURE 10.35 A wall cloud photographed southwest of Norman, Oklahoma. Fig. 10-35, p.285

FIGURE 10.33 Some of the features associated with a tornado-breeding super cell thunderstorm as viewed from the southeast. The storm is moving to the northeast. Fig. 10-33, p.284

FIGURE 10.34 A tornado-spawning thunderstorm over Oklahoma City on May 3, 1999, shows a hook echo in its rainfall pattern on a Doppler radar screen. The colors red and orange represent the heaviest precipitation. Fig. 10-34, p.284

FIGURE 10.38 Doppler radar display of winds associated with the supercell storm that moved through parts of Oklahoma City during the afternoon of May 3, 1999. The close packing of the horizontal winds blowing toward the radar (green and blue shades), and those blowing away from the radar (yellow and red shades), indicate strong cyclonic rotation and the presence of a tornado. Fig. 10-38, p.287

FIGURE 10. 26 Tornado incidence by state FIGURE 10.26 Tornado incidence by state. The upper figure shows the number of tornadoes reported by each state during a 25-year period. The lower figure is the average annual number of tornadoes per 10,000 square miles. The darker the shading, the greater the frequency of tornadoes. Fig. 10-26, p.279

Table 10-2, p.281

FIGURE 10.27 The total wind speed of a tornado is greater on one side than on the other. When facing an on-rushing tornado, the strongest winds will be on your left side. Fig. 10-27, p.280

FIGURE 10.28 A powerful multi-vortex tornado with three suction vortices. Fig. 10-28, p.280