Details: the drivers behind the forecast Silvaplanersee
This page shows the main drivers of the wind system on the lake as a forecast for the next 4 days. How the forecast works
Dashed lines are limits we derived from our measurements at the spot.
Wind: forecast and measurement
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Wind systems at this spot
The measuring station is in Segl-Maria on Lake Sils, above Lake Silvaplana. On sunny days the Maloja wind sets in around midday from south-west to west. It is strongest around 2 pm and eases in the late afternoon. From October to March south foehn brings wind from the same direction on days with little sun. In north foehn conditions the wind at the station comes from north-east to east, often already in the morning, and the Maloja wind usually fails to appear. It also often fails when the upper wind comes from north to south-east.
We cannot see the Julier wind, which blows rarely but strongly from the pass to the north, in Segl-Maria.
The drivers
Sun
Shown is the sun at the spot as a percentage of what is possible under a clear sky.
The sun heats the valleys and so drives the Maloja wind. On overcast days it usually stays weaker.
Upper-level winds: West/East
Shown is the wind at about 1.5 km altitude (850 hPa) above the spot: upwards the share from the west, downwards the share from the east, plus the direction (right axis).
This wind depends on the large-scale weather pattern. When it blows strongly from one direction, the surface wind usually comes from a similar one.
Upper wind north/south
Shown is the wind at about 1.5 km altitude (850 hPa) above the spot: upwards the share from the north, downwards the share from the south.
A strong southerly share goes with foehn and ahead of fronts, a northerly share often brings cooler air.
North and south foehn: pressure Sondrio minus Davos
Shown is the air pressure in Sondrio minus the air pressure in Davos, i.e. south minus north of the Engadine. If the value is strongly negative (down), air pushes over the passes from the north: north foehn. The Maloja wind then usually fails to appear. If it is positive (up), south foehn blows from the same direction as the Maloja wind.
In our measurements in Segl-Maria, from −6 hPa a wind of 8 knots or more from north-east to east blew in 48 % of the hours between 6 am and 7 pm, above −2 hPa in 1 %. From October to March, from +3 hPa the wind came from south-west to west in 41 % of the hours, with balanced pressure in 10 %.
Wetterdaten: Open-Meteo.com (CC BY 4.0), Modelle u.a. DWD ICON – modifiziert (MOS-Windvorhersage) durch addicted-sports. Messdaten: Source: MeteoSwiss (CC BY 4.0). · Open-Meteo.com
Statistical forecast, no warranty – not an official weather forecast and no substitute for severe-weather warnings. Water sports at your own risk; judge the conditions on site. Terms of use