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                                                                                                           HOW TO MAKE A WEATHER FORECAST?

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                                                                                                           HOW TO MAKE A WEATHER FORECAST?

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

For ages the humanity tried to make a prevision on the weather and today weather forecasting is an essential part of our life.
Nowadays we have new technologies and forecasting is more accurate.

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Observation... we can use:

Satellites to see the situattion from the Sapce;

Radar to see where it's  raining;

Monitoring networks to receive information about atmospheric pressure or humidity.

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The weatherman makes previsions referring his experience and what he sees.

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Then he puts the information into particular models: Global Models.
The most important GM are:

GFS (American)

ECMWF (English)

There are lots of GM because every country has different physical conditions.
In a GM white lines rappresent the pressure variation at ground; the colours rappresents the pressure variation in height.
This is not the real forecast, it's only an hypothesys.

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The weatherman can also use a Local Area Model which is more accurate because it splits a smaller area in a grid. Smaller is the area, more accurate will be the forecast

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The weatherman reads all the data and with his experience and his thinking, tries to previse what will be the weather like.

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Video made by Eumesat.

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When you consult a weather forecast you shouldn't:

Trust automatic weather forecast;

Trust weather forecast for days too far.

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Many factors make up the wind, like difference of pressure in the atmosphere, but there are also other ones..

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What makes the wind? Find out in this video narrated by Extension Educator Duane Friend.

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An heat thunderstorm forms when the intense sun rays make water evaporate. The water vapour raises up and forms a cumulonimbus, the thunderstorm cloud. This happens in summer.

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An ice storm forms when ascensional currents make ice crystals become bigger and bigger in the cloud then they fall down.

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The negative charge contained in the clouds is attracted by the earth, positivly charged. The air, which is an isolant, keeps they separed but sometimes negative charges manage to reach the earth and lightning is born.

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THE STRANGEST AND MOST BEAUTIFUL ATMOSPHERIC PHENOMENA

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THE STRANGEST AND MOST BEAUTIFUL ATMOSPHERIC PHENOMENA

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The most beautiful but also dangerous phenomena in the world.

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Is there a golden pot at his end? No, the rainbow forms when sun rays are refracted by the water drops and the light is broken up into the seven colours.

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Sometimes there can be more than one rainbow.

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We still don't understand how do this "magic" lightning forms, but they can appear outside and also inside houses, as our weatherman says.

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In northern Venezuela there is the most electrical part of the earth, with 293 lightnings per year every square kilometer.

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For the realization of the project a special thanks to Francesco del Francia, the weatherman that has provided us information.
http://www.meteoaquesio.it/