Lecture 18 F 2010 w 2003

Lecture 18 F 2010 w 2003 - Lecture 18 Storms Tornadoes...

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Lecture 18: Storms Tornadoes Video questions: What fraction of rotating thunderstorms do NOT produce tornadoes? What does DOW stand for? Where is tornado alley? What % of tornadoes are F5? A tornado is a narrow, violently rotating column of air that extends from the ________ of a thunderstorm __________________ . One way a column of air can begin to rotate is from __________ – when winds at two different levels above the ground blow at different speeds or in different directions. Friction with the ground slows surface winds, but higher in the troposphere, winds blow faster. The faster air above will cause rotation horizontal to the ground (picture a rolling pin). When the rotating air encounters strong updrafts associated with frontal activity, the axis of rotation shifts to perpendicular to the ground T/F Windshear can cause the rotation that may bring about a tornado Thunderstorms A thunderstorm is a rain shower during which you hear thunder. Since thunder comes from lightning, all thunderstorms have lightning. An average thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. A thunderstorm is classified as "severe" when it contains one or more of the following: 1._____________________ 2._____________________ 3._____________________ Which IS an element that will classify a thunderstorm as severe? A. Wind gusts of at least 35mph B. Hail, even tiny hail 1/10 th of an inch in diameter C. Tornado D. Heavy rain Thunderstorms have three stages. 1. The developing stage is marked by a cumulus cloud that is being pushed upward by an updraft, which is _____________________ . Condensation of large quantities of water vapor in clouds liberates tremendous amounts of energy. This process locally heats the air, rapidly changing its density and buoyancy, and causing violent updrafts. A ___________________ cloud develops. 2 The mature stage is when ___________ begins to fall out of the storm, and a _____________ , which is a column of air pushing downward, begins. Downdrafts form when raindrops form and descend through the cloud, and their frictional drag pulls air toward the ground. This is the time for heavy rain, frequent lightning, strong winds, and tornadoes 3. The dissipating stage begins when, eventually, a large amount of precipitation is produced and the ___________ by the ____________.
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Which is mismatched regarding stages of a thundersorm? A. Mature stage: precipitation and downdraft B. Developing stage: updraft and development of a cumulonimbus cloud, with strong downdraft C. Dissipating stage: updraft overcome by downdraft Types of thunderstorms 1 Single cell storms: _________________ (one cloud mass). Most single cell storms are not severe, but it is possible for a single cell storm to produce a brief severe weather event. 2 The
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Lecture 18 F 2010 w 2003 - Lecture 18 Storms Tornadoes...

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