Meteo

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Latest weather observations, satellite imagery, mapped last 3 hours temperature and last 24 hours rainfall

Map display of recent weather data for observing locations

Satellite imagery
This image is obtained by the infrared channel of the MSG (Meteosat Second Generation) satellite, in geostationary orbit at 36000 km of altitude. The infrared channel can be used even in night-time, since the presence of clouds and of other meteorological structures is detected by a indirect measure of their surface temperature.

Immagine satellite

Temperature last three hours
The map shows the average temperature of the last three hours, figured out from a network of 40 thermometric stations. The spatial distribution is based only on altitude. That means that differences between two stations located at the same altitude due, for instance, to a different aspect, are not taken into account.

Temperature ultime 3 ore

Precipitations last 24 hours
This map shows the precipitations of the last 24 hours measured from 30 rain gauges able to melt snow. The spatial distribution is based on a simple real time data interpolation.

Precipitazione ultime 24 ore

Satellite imagery Satellite imagery Temperature last three hours Temperature last three hours Precipitations last 24 hours Precipitations last 24 hours

Weather bulletin

(Issued at 01/03/2015 14:32:56)

Synoptic situation [ Expanded ] [ Collapsed ]

Sea level pressure recorded today at 7.00 am. in Aosta : 1019 hPa.
Sea level and 5500 m situation
Colour contours indicate the geopotential height at 500 hPa, while the blue isoline indicates the sea level pressure (slp). The geopotential height at a given value of pressure indicates the altitude above the sea level with this value of pressure. The geopotential height at 500 hPa is given in decametres: if you multiply by ten you get the altitude, usually between 5200 and 5700 m. Low values – grey to green to blue colours – indicate low pressures systems aloft girdling cold air, while high values – yellow to orange colours – indicate high pressures systems aloft, girdling relatively warm air.

Colour contours indicate the geopotential height at 500 hPa, while the blue isoline indicates the sea level pressure (slp). The geopotential height at a given value of pressure indicates the altitude above the sea level with this value of pressure. The geopotential height at 500 hPa is given in decametres: if you multiply by ten you get the altitude, usually between 5200 and 5700 m. Low values – grey to green to blue colours – indicate low pressures systems aloft girdling cold air, while high values – yellow to orange colours – indicate high pressures systems aloft, girdling relatively warm air.

Situation at 1500 m
The isolines indicate the geopotential height of the 850 hPa surface in decametres – usually around 1400-1500 m – while the colours indicate the temperature at this altitude in the free atmosphere. It is important to notice that the real value of temperature around 1500 m, in the Aosta Valley or in any region with a complex orography, might be very different from that of the free atmosphere, especially in the bottom of the valleys, where the thermal excursion is usually higher, being colder in wintertime and in the dark hours, and warmer in summertime and when the sun shines. The temperature of the free atmosphere is nevertheless very important, showing the true nature of the air masses.

The isolines indicate the geopotential height of the 850 hPa surface in decametres – usually around 1400-1500 m – while the colours indicate the temperature at this altitude in the free atmosphere. It is important to notice that the real value of temperature around 1500 m, in the Aosta Valley or in any region with a complex orography, might be very different from that of the free atmosphere, especially in the bottom of the valleys, where the thermal excursion is usually higher, being colder in wintertime and in the dark hours, and warmer in summertime and when the sun shines. The temperature of the free atmosphere is nevertheless very important, showing the true nature of the air masses.

Situation at 3000 m
This image represents the situation at 700 hPa – around 3000 m – and can therefore be considered representative of the Aosta Valley mountains. The relative humidity is shown by the colours and the wind by the arrows. Grey, yellow and orange colours indicate a progressive nearing to the saturation, favouring the presence of clouds at about 3000 m. The wind vectors are shown only if the wind speed exceeds 10 m/s (about 36 km/h).

This image represents the situation at 700 hPa – around 3000 m – and can therefore be considered representative of the Aosta Valley mountains. The relative humidity is shown by the colours and the wind by the arrows. Grey, yellow and orange colours indicate a progressive nearing to the saturation, favouring the presence of clouds at about 3000 m. The wind vectors are shown only if the wind speed exceeds 10 m/s (about 36 km/h).


Z (dam) and T (°C) at 850 hPa today 12Z Sea level and 5500 m situation Z (dam) and T (°C) at 850 hPa today 12Z Situation at 1500 m RH (%) and Wind at 700 hPa today 12Z Situation at 3000 m

Weather forecast

Sunday 01/03/2015

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Today
Monday 02/03/2015

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Tuesday 03/03/2015

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Very cloudy sky in the NW, patchy cloudy becoming cloudier and cloudier from the afternoon onwards elsewhere. Some light precipitation, especially in the NW, snowy above about 1900/1600 m, and then rain-snow limit decreasing overnight.

Very cloudy with widespread precipitation, more persistent in the NW where will be moderate to locally heavy near the border areas, light to moderate elsewhere; rain-snow line at 1400/1200 m, temporary at higher altitude in the NW. Phenomena will ease from the afternoon onwards.

Cloudy sky with residual snowfalls near the4 borders. Gradually easing in cloudiness starting from the low main valley, up to rather sunny sky over the course of the day.

Winds: 3000 m moderate from WNW becoming strong from W; foehn winds episodes in the NW valleys, breezes in the low main valley. Winds: 3000 m strong from W quadrants; foehn winds developing in the valleys, up to intense in the afternoon. Winds: 3000 m moderate from WNW, easing; foehn winds episodes in the valleys.
Temperatures: rising. Temperatures: rising in the minimum in the valleys with foehn winds condition, decreasing in the maximum. Temperatures: decreasing.
Freezing level 2400 m
Temp 1500 m 7 °
Temp 3000 m -3 °
Freezing level 1500 / 2000 m
Temp 1500 m -1 » 5 °
Temp 3000 m -6 » -12 °
Freezing level 1000 / 1400 m
Atmospheric pressure: stable.
Atmospheric pressure: rising from the afternoon.
Atmospheric pressure: stable.
Communications no communications. Communications widespread moderate snowfalls above 1200/1400 m in the NW, generally lighter elsewhere; strong winds and wind-chill effect in the mountains.
  • General outlook

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    Wednesday 04/03/2015

    4th day

    Thursday 05/03/2015

    5th day

    Friday 06/03/2015

    6th day

    Saturday 07/03/2015

    7th day

    Mix of sun and clouds until Thursday, with low risk of some light precipitation near the border relieves; and then sunnier again.


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