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What is weather ?

What is weather ?. Weather is the current state of our atmosphere , specifically , the troposphere . Air M asses – air is like the part of the Earth it´s on top of. Dry , hot land = dry , hot air Cool ocean = cool , wet air Hot ocean = hot , wet air

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What is weather ?

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  1. Whatisweather? Weatheristhecurrentstate of ouratmosphere, specifically, thetroposphere.

  2. Air Masses – air islikethepart of theEarthit´son top of. • Dry, hotland = dry, hot air • Coolocean = cool, wet air • Hot ocean = hot, wet air • Windsmove air massesfromwheretheywerecreatedto new places. • Front – boundarybetween air masses • Storms and precipitationusuallyform at frontsbecausethe air mixes causingcondensation and wind

  3. Air Pressure • High air pressureusuallymeansgoodweather • High air pressureiscausedbydescending air (rememberthathot air rises and cold air descends) • Thedescendingmotionmakesitdifficultforcloudstoriseintothesky • Lowpressureusuallymeanscloudyweather • Lowpressuremeansthatthecloudsaren´tbeingpushedfromabove, so they can riseeasily. • Pressure can bechangedbytemperature, density of air molecules, and wator vapor (humidity)

  4. CloudsweregivenlatinnamesbyLuke Howard in 1803. Cloudsnames can becombinedtogiveitmultipledescriptions. Whatmight a cumulonimbuscloudbelike?

  5. Precipitation- waterfallingfromthesky • Thetemperature determines thetype of precipitationyou can see. • Rain - abovefreezing (O·C) • Snow – belowfreezing • Sleet – snowthatmelts and refreezes as itfalls • Hail – waterfreezes in thecloudsduringstorms

  6. Humidity – water vapor in the air • Air can hold a certainamount of water vapor • At differenttemperaturestheamountit can holdchanges • Warm air can hold more water vapor and cold air can holdlesswater vapor • Relativehumidityis a ratio of howmuchwater vapor the air has comparedtohowmuchitiscapable of holding • Howmuchisthere : Howmuchthe air can hold • Relativehumidityiswritten as a percent • Air couldhold 22g of water vapor, butonly has 11 g. • 11g : 22g = 11/22 = 0.5 = 50% • Dewpoint – whenthe air issaturated (100% relativehumidity) and condensationforms

  7. Ifthe air forthisdayis holding 35g of water vapor, forwhat time rangewillyouprobablyseedewontheground??

  8. SevereWeather! AAHHHH!!! • Thunderstorms – lighting and thunder • Didyouknowyou can countthesecondsbetweenlighting and thundertoknowthedistance of thestorm? Why? • Because light travelsfasterthansound. Divide thenumberby 5 togetthedistance in miles. Or divide by 3 togetthedistance in kilometers. • Howfar, in miles and kilometers,is a thunderstormwith 10 secondsbetweenseeingthelightning and hearingthethunder? • Tornado – violentwind • Hurricane - themostviolent of allstorms • Other: floods, droughts, wildfires, duststorms, monsoons, blizzards, etc…

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