What Ora and Peler are and how the forecast is produced.
The northern end of Lake Garda has two daily wind systems: the Peler, a northerly that starts overnight and continues into the morning, and the Ora, a thermal southerly that usually starts around midday and carries the afternoon. Both arise from pressure and temperature differences between the Po Valley and the Alps — and weather models can forecast those differences.
Each regime has its own statistical model (logistic regression), trained on 14 years of observations from Meteotrentino’s Torbole station (2012–2026, 10-minute resolution) and the corresponding weather patterns. The site retrieves current Open-Meteo forecast data and calculates the probability that the regime will fire with a mean wind of roughly 8 kt or more.
The main drivers
Pressure gradient: Alps ↔ Po Valley
The core driver of both regimes. At night, a positive Bolzano−Verona gradient drives Peler; during the day, mountain heating creates a thermal low that draws in Ora. An excessively strong northerly gradient (> 8 hPa) can suppress Ora.
Morning sunshine & cloud
No sun, no thermal: morning sunshine over the Sarca Valley and Po Valley strengthens Ora’s thermal drive, while dense cloud weakens it.
Flow aloft (100 m / synoptic)
A broad southerly component strengthens Ora, while northerly flow supports Peler. It is the strongest individual driver in the Ora model.
Precipitation & humidity
Rain weakens Ora or shuts it down completely; rain and high humidity overnight weaken Peler’s driving mechanism.
Heating contrast: Verona ↔ Innsbruck
The more strongly the Po Valley warms relative to the Alpine region, the stronger the thermal draw towards the north.
Glossary
Ora
A thermal valley wind from the south at the northern end of Lake Garda. On good days it starts between roughly 10:40 and 12:20 (median 11:30) and carries the afternoon. In peak season it fires on around three out of four days.
Peler (also Vento)
A northerly wind from overnight into the morning. At Torbole, deflection around Monte Brione means the station records it as a north-easterly to easterly. A good Peler morning occurs on roughly half of all seasonal days.
GO / MAYBE / NO GO
The model probability translated into a recommendation. The thresholds were calibrated on three years of archived previous-day forecasts. MAYBE means borderline: check the live observations in the morning.
Drivers (+/−)
The first three factors shown have the strongest upward (+, green) or downward (−, red) effect on today’s probability. Their ranking comes directly from the model contributions and is not editorially selected.
Ora onset
The point when the southerly reaches a mean wind of at least 8 kt. Across 14 years of observations, the median is 11:30 and half of all days fall between 10:40 and 12:20.