GEOG 108 Lecture 17.docx

GEOG 108 Lecture 17.docx - GEOG 108 – Severe...

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GEOG 108 – Oct 17, 2018 - Severe thunderstorms o Severe thunderstorms are defined as convective storms with frequent lightning, accompanied by local wind gusts of 97kph, or hail that is 2cm in diameter or larger o Severe thunderstorms can also have tornadoes o In most severe thunderstorms, the movement of the storm, in roughly an easterly direction, can refresh the storms supply of warm humid air o With a continual supply of latent heat energy, the updrafts and downdrafts within the storm become balanced and the storm maintains itself indefinitely o Movement of the severe storm is usually caused by the presence of a mid-latitude cyclone cold front or a dry line some 100-300km ahead of a cold front o The next two figures illustrate the features associated with a severe thunderstorm o Storm movement here is left to right because of the motion associated with a mid- latitude cyclone o The upper-level dry air wind is generated from the mid-latitude cyclone and causes the tilting of vertical air currents within the storm o The red arrows represent the updrafts which are created as warm moist air is forced into the front of the storm
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o At the back of the cloud, the updrafts swing around and become downdrafts (blue arrows) o The leading edge of the downdrafts produces a gust front near the surface o As the gust front passes, the wind on the surface shifts and becomes strong with gusts
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  • Fall '19
  • Precipitation, Tropical cyclone, Thunderstorm, upper-level dry air wind

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