Weather

Weather
•    Weather plays an important role in our lives. In cold weather we protect ourselves by wearing woolen clothes while in hot weather we use certain cooling devices like fan, cooler or air conditioner to keep ourselves cool.
•    We wear raincoats or use umbrellas to escape from the rain. We plan many of our day-to-day activities on the basis of prevailing weather conditions. We plan a picnic on a cool, pleasent and cheerful day and not on a hot and sultry day. We even plan a trip to a hill station or any other place after taking into account the weather conditions of that place.
•    Weather is defined as the state or condition of the atmosphere of a particular place, at a particular time in term of humidity, cloudiness, temperature, windspeed, etc.
•    People who study and record weather are called meteorologists.
•    The study of weather is called meteorology.
•    Rainfall is measured by an instrument called the rain gauge. It is basically a measuring cylinder with a funnel on top to collect rain water.
•    The hygrometer is used for humidity measurement. The amount of water vapour present in the air is called humidity.
•    The maximum and minimum temperature are recorded every day by special thermometers called maximum and minimum thermometers.
•    The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs generally in the early morning.
•    All kind of changes in the weather are caused by the sun. There are variation in time of sunrise and sunset. Due to which days are longer in summer than winters. Sun is a huge sphere of hot gases having high temperature although distance of sun from         earth is very large but energy sent by sun is the main source of all heat and light on the earth. Thus sun is the primary source of energy that causes changes in the weather. Earth surface, oceans & atmosphere absorbs and reflects the solar energy,               which play important roles in determining the weather at any place. Due to this property changes in weather occurs near oceans, mountains and in desert etc.

Weather Forecasting
    Weatherman to a certain extent can predict or estimate what the weather will be like in the near future. This is called weather forecasting. It gives the following information :
    (i) Maximum and minimum temperature of the past 24 hours
    (ii) Humidity / relative humidity
    (iii) Rainfall
    (iv) Time of sunrise and sunset
    (v) Time of moonrise and moonset
    (vi) Prediction of weather for the present day