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GY 101 - Oct 18 Lecture Notes

by: Savannah L

GY 101 - Oct 18 Lecture Notes GY 101

Marketplace > University of Alabama - Tuscaloosa > Geography > GY 101 > GY 101 Oct 18 Lecture Notes
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Lecture Notes from Tuesday, October 18, 2016
Atmospheric Proc & Patterns
Professor Douglas Sherman
Class Notes
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This 2 page Class Notes was uploaded by Savannah L on Tuesday October 18, 2016. The Class Notes belongs to GY 101 at University of Alabama - Tuscaloosa taught by Professor Douglas Sherman in Fall 2016. Since its upload, it has received 5 views. For similar materials see Atmospheric Proc & Patterns in Geography at University of Alabama - Tuscaloosa.

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Date Created: 10/18/16
GY 101 – OCT 18 LECTURE NOTES Bergeron Ice Crystal Model – dominate process for clouds above the mid and high latitudes (and about 90% of all precipitation Four TYPES of Precipitation  Convective o Instability  Cyclonic o Frontal  Convergent o Frontal  Orographic o Mountains Orographic  Wind blowing across the surface, meets upward sloping mountain o Wind has to go somewhere, forced to rise  Up and over o As it rises, it’s going to cool off the adiabatic lapse rate and dew point temperature of cloud forms  On the down side, the falling air heats up o Cannot get a cloud to form o Rainshadow – refers to area downward of a mountain range where there is a reduction in precipitation Cyclonic  Applies in mid and high latitudes  Cold fronts and warm fronts o Because cold air is denser than warm, the warm air will flow over the cold air  Cyclonic participation – the air is forced to rise due to frontal activity Convergent  Least common of the four types  Two air masses with undifferentiated temperature characteristics collide  Associated with fronts, but not necessarily warm orcold fronts Convective  Caused by convective mixing in the atmosphere – rising of a warm parcel of air  Air becomes warmer, becomes less dense and buoyant, starts to rise  Most common in the summertime, most consistent with summer thunderstorms in the south  Continues to rise until precipitation becomes thick enough to fall Five FORMSof Precipitation  Rain  Snow  Sleet  Hail  Freezing rain o NOTE: Forms and Types of Precipitation are completely different Sleet – snowflake  melts into a droplet  freezes Freezing Rain - Snowflake  melts into droplet  falls too fast to freeze through air, but freezes as it hits a surface  Most dangerous because it forms black ice  Will hit your hand as liquid, but if it hits other surface (ex. Tree, car) it freezes on contact Hail – Snowflake  melts when it hits warmer, lower part of cloud  begins catching other droplets and becomes larger (if it gets caught in updraft, it can become sleet)  continues to grow through updrafts and downdrafts  as soon as the strongest updraft can’t lift it, it falls as hail (can also be thrown out the side during an updraft)  Almost always associated with convection, which means strong up-tracks  Requires the lower end of cloud above freezing, and upper below freezing


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