Have you heard or seen weather report on TV or radio? Have you experience rainy, sunny, cloudy, or stormy day ? How does so happen?
The change in state of atmosphere is call weather.
Weather is the name given to the change in the condition of the atmosphere. Weather includes wind, storm, rain, snow and sunshine. Weather refers to the state of atmosphere at any given time denoting the short-term variations of the atmosphere in terms of temperature, pressure, wind, cloudiness, etc.
It affects our food, drinks, clothing, way of recreation and work. It affects agriculture, industries, transport and communication as well. This is why the weather is reported daily on radio, television and newspaper. Weather change occur during the year. In some months, it is very hot. In some months, it is very cold. We have main three seasons. They are summer season, the rainy season and winter season. Have you ever seen the condition of sunny weather at one place and cloudy weather at another place at the same time ?
Types of weather
The weather is of different types. They are sunshine, snowfall, rainfall, cloud formation, dew formation, blowing of wind, etc. Weather can vary greatly and largely depending on climate, seasons and various other factors.
Sunshine: Most people find a sunny day pleasant. With the absence of clouds in sky, the sun is able to shine through and provide warmth. A sunny day does not always mean it is warm, though. Cold temperature and wind can be present on sunny days.
Cloudy : On a cloudy day, the sun’s rays are blocked from reaching the earth’s surface due to the presence of clouds. On that day, because the cloud can trap in heat near the ground. Almost always, rain is associated
With clouds. Cloud is nothing more than a large mass of water vapour. As the temperature drops, the Water Vapor in the cloud cools and condenses into raindrop.
Windy : Windy days are primarily formed when a mass warm air rises upward and cold air rushes to fill the vacant place.
Snowfall : Water evaporates from the surface of the water due to the heat of the sun. The water vapour is warmer which goes up to the atmosphere. As it goes upper region, it becomes cold. If it reaches to the more height, it freezes into snow. This snowfalls as white cotton. This process is called snowfall.
Hailstones : When raindrops are very cold while falling toward the earth’s surface, they change into small balls of ice. These are called a hailstone. We say Asine in Nepali. We should sit indoors when hailstones fall.
Fog : In winter season, the water vapour remains very close to the surface of the earth. The air full of water vapour is fog. Fog makes weather cold and causes difficult to see objects on the earth.
Rainfall: When the cloud reaches a height, it cools and transforms into big drops of water with the help of a small particle of water. These drops of water are very heavy. As a result, they fall in the form of rain. If it rains continuously for a long time, it is said to be incessant rain.
Dew: The temperature of the earth’s surface lowers more at night than that on the day. The water vapour of air which comes in contact with the surface changes into water droplets. Such water droplets on the surface are called dew.
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