Warmup What is weather REMINDER QUIZ CH11 WEDNESDAY Chapter 12 Meteorology Causes of Weather Meteorology the study of atmospheric phenomena such as fog clouds snow rain and lighting Weather ID: 769168
Download Presentation The PPT/PDF document "Warm-up What is weather?" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Warm-up What is weather? REMINDER – QUIZ CH.11 WEDNESDAY
Chapter 12 Meteorology
Causes of Weather Meteorology – the study of atmospheric phenomena such as fog, clouds, snow, rain, and lighting Weather - is the condition of the atmosphere at a certain time and place
Climate Climate is the long term weather for a particular area. Usually averaged over 30 or more years. Ex. The climate is hot and humid in Miami, but it is snowing in the picture to the right.
Name Description c Continental Dry m Maritime Wet E Equatorial Hot TTropicalWarmPPolarColdAArcticVery Cold Air masses An air mass is a large body of air that takes on the characteristics of the area over which it forms.
Wind (review) Wind - the movement of air caused by differences in air pressure The greater the difference in pressure the faster wind moves
Pressure belts - As warm air rises at the equator and moves towards the poles, it cools As it cools, some of the air sinks around 30 degrees north and south of the equator At the poles, cold air sinks and moves towards the equator Global Wind Systems
Polar Easterlies - winds that blow from east to west between 60-90 degrees latitude in both hemispheres . Westerlies - The wind belt found between 30-60 latitude in both hemispheres Trade winds - Winds that blow northeast from 30 north latitude to the equator and that blow southeast from 30 degrees south latitude to the equator Global Wind Systems
The combination of pressure belts and the Coriolis effect are the cause of Global winds . Coriolis effect - deflection of particles to the right in the northern hemisphere and to the left in the southern hemisphere due to Earth’s rotation Doldrums - Located along the equator where no winds blow, this creates slow rising air with very little pressure . Horse Latitudes - weak winds that occur at 30 N and 30 S latitudesGlobal Wind Systems
Jet streams - Narrow belts of high speed winds that blow in the upper troposphere and lower stratosphere. They can reach speeds of up to 400 km/h
Fronts Front - An area in which two airmasses meet
Fronts Cold Front - occur when a cold air mass runs into a warm air mass, forcing the warm mass to rise
Fronts Warm Front - When warm masses run into cold masses and slowly displaces it
Fronts Stationary Front - Two air masses meet and neither advances; air masses “stall” Light wind and precipitation Occluded Front – Cold air mass moves so rapidly that it overtakes a warm front Strong winds, heavy precipitation
Pressure Systems High Pressure Systems - Air sinks, then hits the Earth’s surface and spreads out. Wind blows away from high pressure. Clockwise in N. Hemisphere Associated with fair weather
Pressure Systems Low Pressure System - Air rises, must be replaced. Wind blows toward center of low pressure Counter-Clockwise in N. Hemisphere Associated with clouds and precipitation
Pressure Systems Cyclone - an area in the atmosphere that has lower pressure than the surrounding areas that spiral towards the center Anticyclone - the rotation of air around a high pressure center opposite to Earth’s rotation
Pressure Systems
Pressure Systems
Weather Instruments Thermometer - measures temperature by using a liquid that moves up and down due to temperature differences. Barometer - an instrument used to measure atmospheric air pressure. Windsock - an instrument to measure wind direction Anemometer - an instrument used to measure wind speed.
Weather Maps Station Model
Isobars - lines that connect equal points of equal pressure Lines that are close = STRONG WINDS Lines that are far apart = LIGHT WINDS Weather Maps