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  • 1. BY: CASSIE WOLF
  • 2.  As air expands it cools down, as it compresses it warms Dry adiabatic rate is the cooling and heating of unsaturated air Slower rate of cooling caused by the addition of latent heat is the wet adiabatic rate http://www.kidsgeo.com/geography-for-kids/0070- adiabatic-temperature-changes.php
  • 3.  4 mechanisms that can cause air to rise are orographic lifting, frontal wedging, convergence, and localized convective lifting When mountains act as barriers to air flow orographic lifting occurs As air goes up the mountain adiabatic cooling occurs which could generate clouds and precipitationhttp://ocw.usu.edu/Forest__Range__and_Wildlife_Sciences/Wildland_Fire_Management_and_Planning/Unit_7__Atmospheric_Sta bility_and_Instability_3.html
  • 4.  Warm and cold air collide making a front Cooler air acts as a barrier over which warmer air rises pushing the cold air down. http://www.geo.hunter.cuny.edu/ ~tbw/wc.notes/4.moisture.atm.sta bility/frontal_wedging.htm
  • 5.  When air in lower atmosphere flows together lifting happens Since cold air cannot go up it goes down Leads to adiabatic cooling and maybe cloud formation http://ww2010.atmos.uiuc.edu/(Gh)/gui des/mtr/cld/dvlp/cnvrg.rxml
  • 6.  Unequal heating of Earths causes pockets of air to be warmed more then surrounding air Rising parcels of warmer air are called thermalshttp://santasusana.org/pakelly/ES9CP/ES9%20clouds.htm
  • 7.  Stable air tends to remain in its original position while unstable air tends to rise Clouds wont form when stable air conditions are present in the atmosphere https://www.meted.ucar.edu/sign_in.ph p?go_back_to=http%253A%252F%252Fww w.meted.ucar.edu%252Ffire%252Fs290%25 2Funit6%252Fprint.htm
  • 8.  Gas turns into a liquid which can collect in the form of dew, fog, or clouds Air must be saturated to form Saturation occurs most commonly when air is cooled to its dew point http://www.google.com/imgres?q=condensation&um=1&hl=en&safe= active&sa=N&biw=1024&bih=419&tbm=isch&tbnid=- j_VUuUZn2dUEM:&imgrefurl=http://keep3.sjfc.edu/students/kes0089 8/e- port/condensation%2520page%2520for%2520unit.html&docid=cO638H AhHrSoiM&imgurl=http://keep3.sjfc.edu/students/kes00898/e- port/condensepic.jpg&w=600&h=412&ei=xoL0TuCuDunk0QH- ooymAg&zoom=1&iact=rc&dur=156&sig=116166674119090530697&pag e=1&tbnh=100&tbnw=136&start=0&ndsp=13&ved=1t:429,r:3,s:0&tx=70 &ty=70
  • 9.  Clouds are classified by their height and form Cirrus clouds are described as a curl of hair and are very high and thin in the atmosphere Cumulus clouds are rounded individual masses Stratus is a layer or sheet http://en.wikipedia.org/wiki/Cirrus_clo ud
  • 10.  Cirrus, cirrostratus (flat layers), and cirrocumulus (fluffy masses) make up the high cloud family Often made up of ice crystals creating thin and white clouds Not precipitation makers http://mynasadata.larc.nasa.gov/glossary .php?&letter=H
  • 11.  Altocumulus clouds are composed of rounded masses which are larger and denser then cirrocumulus clouds Middle clouds are in the range of 2000- 6000 meters in the atmosphere Infrequent light snow or drizzle may occur in these clouds http://smsjar.blogspot.com/2011/04/clou ds.html
  • 12.  Stratus, stratocumulus, ad nimbostratus make up the low cloud family Nimbostratus produce light precipitations Stratus the develops a scalloped bottom are called stratocumulus http://braindanceisawayoflife.blogspot.co m/2009/04/cloudspotters-guide.html
  • 13.  Some clouds do not fit into anyone of the 3 height categories, these have babes in low height range but extend upward Cumulus clouds may turn into a cumulonimbus cloud under certain circumstances The more movement and more powerful acceleration creates a more vertical range http://www.pilotfriend.com/av_weather /meteo/clouds.htm
  • 14.  Fog is defined as a cloud with a base at or near the ground Fog can be produced by moisture from the sea that moves over land As cool air moves over warm water moisture may evaporate http://www.brainharmonycenter.com/br ain-fog.html
  • 15.  Bergeron process relies on super cooling and super saturation Ice crystals cannot exist with water droplets https://www.meted.ucar.edu/sign_in.ph p?go_back_to=http%253A%252F%252Fww w.meted.ucar.edu%252Fhydro%252Fbasic _int%252Fflash_flood%252Fimage_gallery. htm
  • 16.  Collision-coalescence process forms raindrops in clouds Water absorbing particles remove water vapor from the air at a relative humidity less then 100% As large droplets move through the clouds they join with smaller droplets https://www.meted.ucar.edu/sign_in.ph p?go_back_to=http%253A%252F%252Fww w.meted.ucar.edu%252Ftropical%252Ftext book_2nd_edition%252Fprint_5.htm
  • 17.  The type of precipitation depends on the temperature profile in the lower atmosphere When temperature is above 4 C snowflakes melt and continue to fall as rain As temperature more than -5 C ice crystals come together in clumps http://www.global-greenhouse- warming.com/ecology-of-snow.html
  • 18.  Sleet is the fall of small particles of clear ice Glaze (freezing rain) occurs when raindrops are super cooled as they fall through the air Hailstones begin as small ice droplets that get bigger as they collect super cooled water droplets http://www.erh.noaa.gov/cae/svrwx/hai l.htm