Use a hashtag to identify your tweetFirst two letters of first nameFirst three letters of last nameExample: Greg Tripoli # GrTriExample Tweet: @uwaos100_2014 Stratus clouds not quite reaching the horizon produced a vivid sunset on the west side tonight! #GrTri pic.twitter.com/A05ruL3sCloud Project Cont.The Rules:Tweet 12 pictures with short explanationMust be UNIQUE picturesAt least 3 pictures per monthExtra pictures will be counted towards extra credit (max. 1 per month)One picture of optical phenomena per month can also be taken for extra creditPut three of your pictures into cloud scrapbook (due at end of semester)Academic MisconductCaution: If we find any picture sharing or fraudulent pictures…You receive -15% for the projectMaximum course grade of 70%Example Scrapbook Entry:Date and Time: Friday, October 21, 2011 at 3 pmOriginal Tweet and Picture: @uwaos100_2014 Cirrus clouds at Picnic Point. A warm front is moving in. #GrTriLocation and circumstance: This picture was taken while walking along the path on Picnic Point in Madison.Direction: The camera was pointing northeast and at the horizonDescription: Mares tail cirrus. These are thin fibrous clouds composed entirely of ice which have a distinctive hooked appearance resulting from wind shear across the falling ice particles.Estimated Height or Temperature: The cloud is estimated to be at approximately 30000 ft above the ground.Weather Situation and Web Weather Map: These clouds were formed on the northeast side of a warm front that stretched from the Minneapolis, Minnesota area southeastward to Dubuque, Iowa (see figure xx).Theory on How It Was Formed: These clouds were likely formed by the rising currents of air over the top of the warm front .Point StructureTotal project worth 15% of overall grade12 Tweets worth 7.5%Cloud Scrapbook 7.5%Questions? Email TAStephen [email protected] links:Surface weather maps going back to 1996: http://weather.unisys.com/archive/index.phpGuide to optical phenomena: http://www.atoptics.co.uk/ (no, blue skies won't count for extra credit)Guide to cloud types: http://www.crh.noaa.gov/lmk/?n=cloud_classificationBack to lecture:Website of the day:http://whirlwind.aos.wisc.edu/~wxp/nids/nids.htmlThis is the UW AOS Department NEXRAD Radar site. Look at:1. Regional composites2. Individual radar reflectivity, Doppler, and Accumulated rain* A Nice site because the black background contrasts nicely with radar imageWhat is a “cloud”?Cloud: mass of air containing suspended hydrometeors (water or ice) that act to reduce visibility and sometimes form precipitating water.Fog: A cloud that is in contact with the surfaceCloud Versus Haze: if the suspended particles are primarily composed of a non water substance, such that the air is not maintained at water or ice saturation, the particles are referred to Haze rather than a cloudWhat causes clouds to form?For a cloud to form, air parcels must become saturated. To do so…1. Add humidity? No, since vapor gas moves with the air, one can not flux vapor into an air parcel except through evaporation. However, evaporation rates are proportional to the excess of vapor pressure over saturation vapor pressure. Hence evaporation goes to zero as the relative humidity approaches 100%!2. Decrease temperature to create saturation by one of the following 3 processes:RadiationConductionExpansional cooling through rising motion3. Mix parcels of 2 differing temperaturesThere are 4 basic types of clouds:1. Fogs2. Stratiform3. Cirrus4. CumulusFogsFogs are clouds in contact with surface. Different fogs are associated with different formation processesRadiation Fog: Results from radiative cooling of a moist layer. Radiation fog occurs when radiative processes dominate.Advection Fog: Results when moist air being advected over a cool surface. Or when advective and dynamic processes dominate.Mixing Fogs: Results when mixing of parcels at two different temperatures and humidities. Such as steam fog and frontal fog.Upslope Fog: Expansional Cooling of upscale flowLecture 1Outline of Last Lecture I. None first lectureOutline of Current Lecture II. Cloud ProjectIII. Description of cloudIV. Fog identification Current LectureCloud Project: Tweet @uwaos100_2014 with a link to a picture that you took! Upload picture through Twitter Use a hashtag to identify your tweet- First two letters of first name- First three letters of last name Example: Greg Tripoli # GrTri Example Tweet: @uwaos100_2014 Stratus clouds not quite reaching the horizon produced a vivid sunset on the west side tonight! #GrTri pic.twitter.com/A05ruL3s Cloud Project Cont. The Rules: Tweet 12 pictures with short explanation  Must be UNIQUE pictures At least 3 pictures per month Extra pictures will be counted towards extra credit (max. 1 per month) One picture of optical phenomena per month can also be taken for extra credit Put three of your pictures into cloud scrapbook (due at end of semester) Academic Misconduct Caution: If we find any picture sharing or fraudulent pictures…- You receive -15% for the project- Maximum course grade of 70% Ocn Atm 100 1st Edition Example Scrapbook Entry: Date and Time: Friday, October 21, 2011 at 3 pm Original Tweet and Picture: @uwaos100_2014 Cirrus clouds at Picnic Point. A warm front is moving in. #GrTri Location and circumstance: This picture was taken while walking along the path on Picnic Point in Madison. Direction: The camera was pointing northeast and at the horizon Description: Mares tail cirrus. These are thin fibrous clouds composed entirely of ice which have a distinctive hooked appearance resulting from wind shear across the falling ice particles.  Estimated Height or Temperature: The cloud is estimated to be at approximately 30000 ft above the ground.  Weather Situation and Web Weather Map: These clouds were formed on the northeast side of a warmfront that stretched from the Minneapolis, Minnesota area southeastward to Dubuque, Iowa (see figure xx). Theory on How It Was Formed: These clouds were likely formed by the rising currents of air over the top of the warm front . Point Structure Total project worth 15% of overall grade 12 Tweets worth 7.5% Cloud Scrapbook 7.5% Questions? Email TA Stephen Ogden [email protected] Useful links: Surface weather maps going back to 1996: http://weather.unisys.com/archive/index.php Guide to optical