STRANGE CLOUDS (Chaps. 5 & 6).

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STRANGE CLOUDS (Chaps. 5 & 6).
Presentation transcript:

STRANGE CLOUDS (Chaps. 5 & 6)

Contrails

Contrails

p. 134

This enhanced infrared image from NASA's Terra satellite shows a widespread outbreak of contrails over the southeastern United States during the morning of January 29, 2004. Satellite data are critical for studying the effects of contrails. The crisscrossing white lines are contrails that form from planes flying in different directions at different altitudes. Each contrail spreads and moves with the wind. Contrails often form over large areas during winter and spring. CREDIT: NASA

Distrail (Dissipation Trail, Canal Cloud)

Hole Punch Cloud

© Vicki Harrison

Mountain Waves and Lee Waves (Lenticular) Page: 161 FIGURE 6.24 Lenticular clouds that form in the wave directly over the mountain are called mountain wave clouds, whereas those that form downwind of the mountain are called lee wave clouds. On the underside of the lee wave’s crest a turbulent rotor cloud may form.

p. 161 Mark J. Madigan, Walsenburg, CO

Pileus

Pileus Formation

p. 132

Lenticular Clouds FIGURE 6.25 Lenticular clouds forming one on top of the other over the Sierra Nevada.

Lenticular Clouds

Lenticular Clouds

Lenticular Cloud

Lenticular Cloud p. 132, 161 © Brian Holden

Cumulus Castellanus

Entrainment Mixing of drier, cooler air along cloud edges. Can cause cloud droplets to evaporate. Entrainment is greater with stronger rising motion in cloud. p. 158

Cumulus Castellanus p. 164–165

Mammatus

Pendules on Contrail

Mammatus

Mammatus

Mammatus

Mammatus p. 132

Fractostratus (“Scud”) p. 130

Fractostratus (“Scud”)

Virga

Virga p. 179

Billows

Billows Vertical Wind Shear strong wind weak wind p. 164, 235

Billows Page: 164 FIGURE 6.27 Billow clouds forming in a region where wind speed changes rapidly with altitude. This is a region of strong vertical wind shear. (More on the topic of wind shear and the formation of these clouds is given in Chapter 9, p. 235.)

Cloud Streets

Cloud Streets STABLE UNSTABLE cold ice warm water wind

Cloud Streets p. 164, 300