Whois & Analysis for meteotrend.com

Weather forecasting is the application of science and technology to predict the state of the atmosphere for a given location.

Human beings have attempted to predict the weather informally for millennia, and formally since the nineteenth century.

Weather forecasts are made by collecting quantitative data about the current state of the atmosphere at a given place and using scientific understanding of atmospheric processes to project how the atmosphere will change.

Humidity is the amount of water vapor present in the air.

Water vapor is the gaseous state of water and is invisible.

Humidity indicates the likelihood of precipitation, dew, or fog.

Higher humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin.

This effect is calculated in a heat index table or humidex.

The amount of water vapor that is needed to achieve saturation increases as the temperature increases.

As the temperature of a parcel of water becomes lower it will eventually not reach the point of saturation without adding or losing water mass.

The differences in the amount of water vapor in a parcel of air can be quite large.

For example, a parcel of air that is near saturation may contain 28 grams of water per cubic meter of air at 30 °C, but only 8 grams of water per cubic meter of air at 8 °C.

'Atmospheric pressure'atmosphere of Earth (or that of another planet).

In most circumstances atmospheric pressure is closely approximated by the hssure caused by the weight of air above the measurement point.

As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation.

On average, a column of air in cross-section, measured from sea level to the top of the atmosphere, has a mass of about and weight of about.

That force (across one square centimeter) is a pressure of 10.1 N/cm2 or 101 kN/m2.

A column in cross-section would have a weight of about or about 65.4 N.

In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity.

The main forms of precipitation include drizzle, rain, sleet, snow, graupel and hail.

Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and "precipitates".

Thus, fog and mist are not precipitation but suspensions, because the water vapor does not condense sufficiently to precipitate.

Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air.

Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud.

Short, intense periods of rain in scattered locations are called "showers.".

A temperature is an objective comparative measurement of hot or cold.

It is measured by a thermometer.

Several scales and units exist for measuring temperature, the most common being Celsius (denoted °C; formerly called centigrade), Fahrenheit (denoted °F), and, especially in science, Kelvin (denoted K).