Weather: my report in earth science
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Weather: my report in earth science

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    Weather: my report in earth science Weather: my report in earth science Presentation Transcript

    • Weather*Is a term that encompassesphenomena in the atmosphere ofa planet.*It is also normally taken to meanthe activity of these phenomenaover short periods of time usuallyno more than a few days.
    • To produce a short-range forecast isindeed a big task involving the foursteps. Included in these are:ObservationCollection and Transmission ofWeather DataPlotting and Analysis of WeatherDataPrognosis or Forecast
    • *From the weatherpatterns, a number ofmethods are used toknow the future state ofatmosphere, a job calledweather forecasting.
    • WHAT IS A WEATHERFORECAST? (weather forecasting)
    • A weather forecasting issimply a scientificestimate of futureweather condition.
    • *Weather condition is the stateof the atmosphere at a giventime expressed in terms of themost significant weathervariables.*The significant weathervariables being forecast differfrom place to place.
    • HOW IS AWEATHERFORECAST MADE?
    • *In forecasting the weather, aMeteorologist must at least knowsomething about the existingweather condition over a large areabefore he can make a reliableforecast.*The accuracy of his forecastdepends largely upon his knowledgeof the prevailing weather conditionsover a very wide area.
    • *The forecast decisionis based on variousforecasting tools.*The basic tool ofweather forecaster isthe WEATHER MAP.
    • *The WEATHER MAP depicts thedistribution patterns ofatmospheric pressure, wind,temperature and humidity at thedifferent levels of theatmosphere.*There are two types of the basicweather map namely: the surfacemap and the upper – air maps.
    • Five standardlevel/steps of theupper air maps thatare constructedtwice daily at twelve -hourly interval.
    • *Observation*Collection and Transmission ofWeather Data*Plotting and Analysis of weatherData*Analysis of Weather Maps, Satelliteand Radar Imageries and OtherData /Prognosis or forecast*Formulation of Forecast
    • Observation
    • Plotting and Analysis OfWeather Data
    • Analysis Of Weather Maps, SatelliteAnd Radar Imageries And OtherData/Prognosis or Forecast
    • Formulation Of TheForecast
    • *The surface maps aremade four times daily attwelve- hourly interval.The distribution patterns ofrain or other forms ofprecipitation andcloudiness can also bedelineated.
    • Numerical Weather Prediction*Is the science ofpredicting the weatherusing “models” of theatmosphere andcomputational techniques.
    • TECHNIQUES*Persistence*Use of a barometer*Looking at the sky*Now casting*Use of forecast models*Analog techniques
    • Weather Elements:*Temperature*Atmospheric Humidity*Atmospheric Pressure*Wind
    • Weather Instruments*Temperature thermometerMinimum thermometerThermographThermometer Shelter orScreen
    • Atmospheric Pressure*BarometerMercurial barometerAneroid barometer
    • Surface WindVelocity and Direction:
    • Wind vane (weather vane)AnemometerAerovaneSling-psychrometerhygrothermograph
    • *Hygrometer*Precipitation*Rain Gauge*clouds
    • SpecialInstruments toMeasure Upper- Air Data:
    • *Pibal/Theodolite (Pilot BalloonTheodolite)*Radiosonde*Wind-finding radar*Weather surveillance radar*Satellite imagery
    • Weather SatelliteData: Modern Tool for Weather Analysis
    • *Polar-ObtainingSatellites*GeostationaryMeteorological Satellite(GMS)
    • What CausesRainfall?
    • Thank you forlistening …