Labs 11 & 12

Labs 11 & 12 - Lab 11: Severe Thunderstorms: A Case...

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Lab 11: Severe Thunderstorms: A Case Study 1. Storm spotter B probably should interpret his storm as an immediate threat. a. Type of Storm viewed by Spotter A: Multi-cell thunderstorm b. Type of storm viewed by Spotter B: Supercell storm c. An ordinary, B super; an ordinary thunderstorm (sometimes referred to as an "air mass thunderstorm") is characterized by one or more updrafts that are typically oriented in an upright fashion. The supercell thunderstorm is characterized by single dominant, rotating updraft that tilts downwind. Given that supercells are the most prolific producers of severe weather, Spotter A’s storm is not an immediate threat (though it could become a supercell later), whereas Spotter B’s storm is. 2. The name of the level where you would expect to find the base of a typical thunderstorm is called the lifting condensation level (LCL). This is where humidity reaches 100% and the cloud starts to form. 3. #1 Orography lift - uplift caused by the topography (i.e., terrain). #2 Fronts (barriers between to air masses), drylines (line that separates moist and dry air), or outflow boundaries #3 - Solar heating 4. In figure 6, the cold front extends from the northeast to southwest direction along the blue and green. In figure 7 there is a dry line that extends from western Oklahoma to the southwestern portion of Texas. There is a small area of vorticity in the Oklahoma panhandle area, within the convective band/conveyor belt. There is an inverted trough stretching down from Nebraska, through Kansas and Oklahoma. 5. Lightning occurs during the mature stage of the thunderstorm. If the storm is moving from the west toward the observer, the main updraft is to the west of the observer. It is possible that the updraft is immediately overhead. Either way, easterly winds imply that air is moving into the storm before being lifted into the updraft. Thus, the storm cannot be dissipating. Because frequent lightning is accompanying the storm, it must be well established. The thunderstorm is likely in its mature stage. 6. Cold and warm fronts are clashing at that region. The radar reflectivity is at its peak. 7. The thunderstorm is at the dissipating stage and the reason I say this is because the storm’s direction is east to northeast and is rapidly leaving the region. 8.
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Labs 11 & 12 - Lab 11: Severe Thunderstorms: A Case...

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