Lecture 12 - Storms - Lecture 12: Storms Thunder,...

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Lecture 12: Storms – Thunder, Lightning, Hail, Tornadoes and Dust Weather Climate 1. EXAM QUESTION! What is the difference between weather and climate?**** 2. Weather refers to the day-to-day changes in atmospheric conditions: temperature, precipitation 3. Climate is the long-term statistical average of weather conditions; assessed using at least 30-years of data 1. Also includes long-term precipitation pattern 2. You can get same weather in 2 different climates Adiabatic Cooling 1. Adiabatic cooling occurs when rising air cools as it expands without change in heat content 2. For dry air the cooling rate is 100C for every 1000m 3. Amount of heat stays Adiabatic Lapse Rates 1. The saturated adiabatic lapse rate is less than the dry adiabatic lapse rate due to the release of latent heat during condensation 2. Different if you have moisture in air and when you don’t Convection 1. Heating of the Earth’s surface leads to rapidly rising parcels of air (convection) with subsequent condensation and cloud formation Winds and Pressure Gradients 1. High pressure system – prevents warm air from rising clear skies 2. Low pressure system – warm air rises
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This note was uploaded on 03/26/2011 for the course EARTH SC 2gg3 taught by Professor Sonneberg during the Spring '11 term at McMaster University.

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Lecture 12 - Storms - Lecture 12: Storms Thunder,...

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