GY 101 - Oct 18 Lecture Notes
GY 101 - Oct 18 Lecture Notes GY 101
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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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