weather and climate basics - · pdf file emits radio-wavelength signals and records echoes...
TRANSCRIPT
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“Weather Basics”
Michael J Passow Kathleen Murphy
AMS Teachers Workshop Austin, TX
Jan 8, 2013
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Weather is what you get, Climate is what you expect
Weather includes
• Temperature
• Air pressure
• Wind speed and direction
• Humidity
• Clouds
• Precipitation
Climate describes
• Average (mean), high (maximum), and low (minimum)(30-year)
• Record values
• Long-term conditions (droughts, floods)
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Monitoring Weather on the Surface ASOS – Automated Surface Observing System
Automatically collects data every minute, 24/7
• Sky conditions
• Temperature
• Pressure
• Humidity
• Wind
• Visibility/fog/haze
• Precipitation
http://www.nws.noaa.gov/ost/asostech.html
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What, basically, causes weather?
1. Air Masses
Large parcels of air with similar temperature and humidity at any elevation
http://www.fas.org/irp/imint/docs/rst/Sect14/Sect14_1b.html
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4 Basic Types of Air Masses
• Continental Polar (cP) – dry and cool or cold
• Maritime Polar (mP) – humid and cool
• Continental Tropical (cT) – dry and hot
• Maritime Tropical (mT) – humid and warm
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What, basically, causes weather?
2. Weather Fronts
Boundary zones where air masses “battle” to move over regions
http://okfirst.mesonet.org/train/meteorology/graphics/Fronts.gif
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Cold Fronts
Cold Front – cooler air pushes under warmer air
• Relatively steep slope
• Move relatively fast (25 mph/40 km per hr)
• Often bring violent weather – strong thunderstorms, squall lines, tornadoes
• Cooler weather, clearing skies, change in wind direction
http://okfirst.mesonet.org/train/meteorology/Fronts.html
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Warm Fronts
• Warm Front – warmer air rises over cooler air
• Less violent, move more slowly
• Cirrus clouds, then altostratus/altocumulus, then stratus or stratocumulus
• Light to moderate continuous rain
• Gradual clearing and warming, lighter winds
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Occluded Front
• Forms when a second cold front overtakes a warm front and lifts it
• Weather ahead of the occlusion is similar to that of warm front, and weather behind similar to that of a cold front
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Stationary Front
• Forms when neither air mass can push the other
• Other form when polar air masses are significantly modified (“stalled cold fronts”)
• Behave like mild warm fronts—gentle precipitation, overcast
• Winds on both sides may be parallel to the front
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What, basically, causes weather?
3. Cyclones --
• low pressure systems
• Stormy
• Often occurs where cold and warm fronts meet
Anticyclones –
• high pressure systems
• Fair weather
• Behind fronts in center of air masses
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http://www.geography.hunter.cuny.edu/~tbw/wc.notes/6.air.pressure.winds/airflow_associated_with_cyclones.anticyclones.htm
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Comparing Highs and Lows
• Air in cyclones moves inward, counter-clockwise, upward
• Air in anticyclones moves downward, outward, clockwise
http://www4.uwsp.edu/geo/faculty/ritter/geog101/textbook/circulation/cyclones_and_anticyclones.html
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Weather Maps
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Station Models
Coded pattern to represent conditions at location
http://www.hpc.ncep.noaa.gov/html/stationplot.shtml
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Weather occurs in 3-D
• Radiosondes carried by weather balloons give data about conditions aloft
• Temperature, pressure, winds, relative humidity
• Carried by weather balloon up to more than 100,000 ft
http://www.ua.nws.noaa.gov/factsheet.htm
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Launched 2x a day at 0000 GMT and 1200 GMT
http://www.ncdc.noaa.gov/oa/climate/igra/ Stuve diagram shows radiosonde information
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Upper-Air Weather Maps
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Weather Radar
http://www.radartutorial.eu/15.weather/wx04.en.html
Emits radio-wavelength signals and records echoes that detect clouds, precipitation, and winds in a 200-mi (320-km) radius
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Weather Satellites
• Geostationary (geosynchronous) Revolve at same rate Earth orbits, so stay above same location
Sensor instruments detect
• variations in visible light reflected off surface
• Variations in infrared energy (heat)
• Variations in water vapor
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Weather Satellite Imagery
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5 weather satellites provide global coverage
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Storms
• Tornadoes
http://mmem.spschools.org/grade5science/weather/tornadodiagram.html
http://www.uvm.edu/~inquiryb/webquest/sp08/pmontgom/hurricanestornadoes.html
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Storms
• Hurricanes
http://www.uvm.edu/~inquiryb/webquest/sp08/pmontgom/hurricanestornadoes.html http://mmem.spschools.org/grade5science/
weather/hurricanediagram.html
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Storms
• Blizzards • Heat Waves
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To learn more, start at:
• AMS DataStreme Atmosphere http://www.ametsoc.org/amsedu/dstreme/index.html
• NOAA Educational Resources http://www.education.noaa.gov/Weather_and_Atmosphere/
• NWS Jet Stream – Online School for Weather http://www.srh.noaa.gov/srh/jetstream/
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Additional notes: