Download
1 / 52

Weather - PowerPoint PPT Presentation


  • 171 Views
  • Uploaded on

Weather. Click HERE for Discovery Channel Guide to Extreme Weather (50 min). Weather -It’s what’s happening outside NOW!. Weather. All weather is a result of humidity, condensation and pressure. Water Cycle. Humidity—Water Vapor in the Air.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Weather' - hayden-fulton


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Click here for discovery channel guide to extreme weather 50 min
Click HERE forDiscovery ChannelGuide to Extreme Weather (50 min)


Weather it s what s happening outside now
Weather-It’s what’s happening outside NOW!


Weather
Weather

All weather is a result of humidity, condensation and pressure.



Humidity water vapor in the air
Humidity—Water Vapor in the Air

  • Specific humidity: actual amount of water vapor in the air at a given time & place (grams of vapor per kilogram of air)

  • Warmer air can hold more water vapor


Humidity
Humidity

Relative humidity: how close the air is to reaching its maximum capacity of water vapor

  • expressed as a percentage

  • 100% means it has reached maximum capacity


Humidity1
Humidity

Measured with a psychrometer

A psychrometer has two thermometers to determine humidity. The dry bulb thermometer measures the room temperature, and wet bulb thermometer is wrapped in a wet cloth. Air is passed through the psychrometer to evaporate moisture on the wet bulb. The readings on the dry bulb thermometer and the wet bulb thermometer are then compared to determine the actual humidity.


Condensation
Condensation

When water changes from a gas to a liquid

  • Dew point: the temperature at which the air becomes saturated with water vapor & condensation occurs

  • If air cools below the dew point, water starts condensing into a liquid, forming dew or cloud droplets


Condensation1
Condensation

  • Fog & clouds form only when there are condensation nuclei (like dust particles) for the water to condense on

  • Air must cool below its dew point






Smog over LA

from car exhaust


Cloud formation
Cloud Formation

  • When warm, wet air from the surface rises, it begins to cool. Eventually, the temperature drops to its dew point, and the water vapor can condense onto the condensation nuclei

  • Condensation level: the atmospheric level at which condensation occurs


Warm air rises taking the water vapor along with it once it cools it condenses forming a cloud
Warm air rises taking the water vapor along with it. Once it cools, it condenses forming a cloud.


Cloud types
Cloud Types it cools, it condenses forming a cloud.

Classified by altitudeand shape


Explain the process of cloud formation
Explain the process of cloud formation it cools, it condenses forming a cloud.


Ufos or what what happened
UFOs or what? it cools, it condenses forming a cloud.What happened?


Cloud types1
Cloud Types it cools, it condenses forming a cloud.

Stratus: clouds that form inlayers

Cirrus: high,featheryice clouds

Cumulus: fluffyclouds with flat bases

Nimbus: darkrainclouds


Cloud types2
Cloud types it cools, it condenses forming a cloud.


Precipitation
Precipitation it cools, it condenses forming a cloud.

Any form of water that falls from a cloud to Earth’s surface


Types of precipitation
Types of Precipitation it cools, it condenses forming a cloud.

  • Rain

  • Snow

  • Sleet: raindrops that refroze on their way to the surface

  • Freezing Rain: raindrops that only freeze when they hit the surface

  • Hail: when frozen raindrops are bounced up & down in the cloud until they fall in a huge ball of ice


Types of precipitation1
Types of Precipitation it cools, it condenses forming a cloud.

depend on the temperature of the atmosphere, both at the surface & on the way down

snow

sleet

freezing rain


Measuring precipitation
Measuring Precipitation it cools, it condenses forming a cloud.

  • Rain gauge: measures liquid precipitation

  • Measuring stick: measures frozen precipitation


Where is precipitation
Where is Precipitation? it cools, it condenses forming a cloud.


Where is precipitation1
Where is Precipitation? it cools, it condenses forming a cloud.

Rain Shadow effect: near a mountain range, the windward side gets lots of rain and the leeward side gets little/no rain – the rain shadow


Explain the rain shadow effect
Explain the Rain Shadow Effect it cools, it condenses forming a cloud.


Extreme weather 1 minute video
Extreme Weather it cools, it condenses forming a cloud.1 minute video

  • http://science.discovery.com/videos/against-the-elements-mashups-devastating-winds.html


Air mass
Air Mass it cools, it condenses forming a cloud.

  • A large body of air in the lower troposphere that has similar characteristics throughout

  • Temperature & humidity depend on origin and move with the air mass


Types of air masses
Types of Air Masses it cools, it condenses forming a cloud.

Continental: dryPolar: cold

Maritime: wetTropical: warm

  • Continental polar (cP): cold & dry

  • Maritime polar (mP): cold & wet

  • Continental tropical (cT): warm & dry

  • Maritime tropical (mT): warm & wet


Types of air masses1
Types of Air Masses it cools, it condenses forming a cloud.


Types of air masses2
Types of Air Masses it cools, it condenses forming a cloud.


Fronts boundary between two air masses
Fronts—boundary between two air masses it cools, it condenses forming a cloud.


Fronts
Fronts it cools, it condenses forming a cloud.

  • Cold Front: boundary between advancing cold air mass & a warmer air mass it is displacing

    • Rising warm air usually produces precipitation if wet

    • Air becomes colder after front passes


Fronts1
Fronts it cools, it condenses forming a cloud.

  • Warm Front: boundary between advancing hot air mass & a colder air mass it is displacing

    • 1st clouds days in advance, then RAIN

    • Air becomes warmer after front passes


Fronts2
Fronts it cools, it condenses forming a cloud.

  • Occluded Front: when cold front ‘catches up’ to a warm front, producing clouds & precipitation


Fronts3
Fronts it cools, it condenses forming a cloud.

Stationary front: when a front stops moving forward, producing clouds & precipitation – causes floods if stationary too long


Station model
Station Model it cools, it condenses forming a cloud.


Surface weather map
Surface Weather Map it cools, it condenses forming a cloud.


Locating a front
Locating a Front it cools, it condenses forming a cloud.

  • Wind direction changes

  • Temperature changes sharply

  • Dew Point changes sharply


Weather forecasting
Weather Forecasting it cools, it condenses forming a cloud.

  • Satellites

  • Radiosondes

  • Surface observations


Forecasting
Forecasting it cools, it condenses forming a cloud.

  • Computer models take current data & plug it into equations to predict weather

  • Meteorologists take computer models & tweak them to fit their experience with local conditions


Forecasting1
Forecasting it cools, it condenses forming a cloud.

Trend Method: using past movement of a front & precipitation to predict future movement


Bibliography
Bibliography it cools, it condenses forming a cloud.

  • http://www.eas.slu.edu/People/CEGraves/Eas107/mteffect1.jpg

  • http://www.auxonline.org/~futureweb/Weather/Aviation_weather/Wx_symbols/front_symbols.gif

  • http://cimss.ssec.wisc.edu/wxwise/station/station.gif

  • http://antwrp.gsfc.nasa.gov/apod/image/0409/frances2_noaa_big.jpg

  • http://www.librarypreservation.org/management_and_planning/monitors3b.htm

  • http://www.photolib.noaa.gov/historic/nws/wea02047.htm

  • http://www.ashcreekimages.com/Cloudscape5.html

  • http://www.capetownskies.com/6027/may_jun03.htm

  • http://met.no/met/met_lex/l_p/nimbostratus_bilder/image002.jpg

  • http://www.weatherstock.com/cloudcat3.html

  • http://www.srh.weather.gov/srh/jetstream/synoptic/precip.htm

  • http://www.accessnoaa.noaa.gov/aug0701/oncamera.html

  • http://www.clas.ufl.edu/users/emartin/GLY3074S03/images/atmcirccells.jpg

  • http://rst.gsfc.nasa.gov/Sect14/airmasses_schem.jpg

  • http://fcgov.com/oem/oem-images/cold-front.jpg

  • http://www.metoffice.com/education/curriculum/lesson_plans/weathersystems/partb.html

  • http://geography.radley.org.uk/metlink/ppt/depression/HTML/sld001.htm

  • http://www.windows.ucar.edu/tour/link=/earth/Atmosphere/tstorm/occl_front.html

  • http://members.aol.com/pakulda/stpptnts.htm

  • http://www.wrh.noaa.gov/fgz/science/svrwx.php?wfo=fgz

  • http://www.econet.org.uk/weather/tornad.html

  • http://www.tnema.org/images/Misc/TORN1.jpg

  • http://www.nhoem.state.nh.us/mitigation/Hurricane%20Structure%20Graphic.gif

  • http://www.estatevaults.com/bol/images/%20%20Boston%20Blizzard.jpg

  • http://www1.ncdc.noaa.gov/pub/data/images/blizzard-midwest-19990102-g8ir.gif

  • http://www.erh.noaa.gov/buf/neaster.jpg

  • http://www.chincoteaguechamber.com/62-poling.jpg

  • http://www.iac.ethz.ch/en/groups/richner/cd/doc/radiosonde/images/sonde.jpg

  • http://www.msc.ec.gc.ca/education/teachers_guides/module08_image_files/stn_model.gif

  • http://66.208.12.20/amsedu/dstreme/images/sfc_map_12.gif

  • http://ngwww.ucar.edu/ncl/images/climate.gif

  • http://www.hprcc.unl.edu/nebraska/september30-2004YearTDataUS.png


ad