Details: the drivers behind the forecast Rohrspitz
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
↔ swipe to page through the chart
Wind systems at this spot
At the measuring station in Rohrspitz the wind mostly comes from the west and south. In foehn conditions it blows from the south, often strong and gusty. The Bise comes from north to north-east here.
South wind without foehn and north wind without Bise do occur here, but we cannot reliably forecast them. The thermal wind brings hardly any wind here.
The drivers
West/East High-Altitude Winds
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.
North-South High-Altitude Winds
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.
Foehn: pressure south minus north
Shown is the air pressure in Chur minus the air pressure in Ulm, i.e. south minus north of the Alps. If the value is positive (up), air pushes over the Alps from the south and drops into the valleys on the north side as a warm, dry and gusty foehn. Whether it reaches the lake also depends on cold air in the valley and on the upper wind.
In our measurements in Rohrspitz, from +3 hPa a south wind of 11 knots or more blew in 9 % of the hours between 5 am and 7 pm, with negative values in 0 %.
Bise: pressure Geneva minus Konstanz
Shown is the air pressure in Geneva minus the air pressure in Konstanz. If the value is negative (down), the higher pressure lies to the north-east and cool air flows south-west between the Jura and the Alps: the Bise. The larger the difference, the stronger it blows, usually more during the day than at night.
In our measurements in Rohrspitz, from −3 hPa a wind of 11 knots or more from north-west to north-east blew in 12 % of the hours between 5 am and 7 pm, above −1 hPa in 1 %.
Wetterdaten: Open-Meteo.com (CC BY 4.0), Modelle u.a. DWD ICON – modifiziert (MOS-Windvorhersage) durch addicted-sports. Messdaten: GeoSphere Austria (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