Walchensee wind: forecast and measurements
30 days of forecast vs. what actually happened at the lake. Click a single day to see its details.
Last 30 days
Rule-based forecast (actually used)
ML-based forecast — logistic (experimental)
ML-based forecast — HistGradientBoosting (black-box model, experimental)
Actual measurements (session ≥ 1 h)
Tue Sep 22
Wed Oct 21
session (≥ 1 h ≥ 11 kt)
marginal (≥ 1 h ≥ 8 kt)
no wind
no data
thunderstorm (forecast rows: predicted · actual row: observed)
Sep 27, 2026
avg wind
gust
ignition (8 kt)
session (11 kt)
For Sep 27, 2026
MAYBE
dew-point spread 1.6°C — air too moist, solar energy lost to evaporation
🤖 ML — logistic
experimental
GO
GO 61% ·
MAYBE 24% ·
NO GO 15%
Strongest inputs —
(+) Bolzano pressure, dew-point spread, daytime cloud.
🤖 ML — HGB · black box
experimental
GO
GO 57% ·
MAYBE 40% ·
NO GO 3%
Most distinctive inputs: morning solar, Innsbruck pressure, Bolzano pressure.
Experimental shadow models — they never drive the verdict.
How good are they? →
How the day was forecast at the time, before the rules were recalibrated — shown for comparison only.