Weather: my report in earth sciencePresentation 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:ObservationCollection and Transmission ofWeather DataPlotting and Analysis of WeatherDataPrognosis 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
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