Le Grand Ratz
📍 Rhone-Alpes , Departement de l'Isere · Nearest city: La Buisse (1 km)
54 XC score / 100 · takeoff at 802 m · 📍 View on map
Coordinates and external links
45.32930, 5.63590Forecast next days
Updated: 2026-05-02 16:15 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Not recommended for flying, cloud base ~175 m, wind 7 km/h, precipitation 8.9 mm.
base ~175m · wind 7 km/h · precip 8.9mmNot recommended for flying, cloud base ~348 m, wind 9 km/h, precipitation 13.4 mm.
base ~348m · wind 9 km/h · precip 13.4mmComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
🌬 Daily wind (next days)
Daily summary (10m wind). Full hour × altitude chart is being added progressively.
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
🗓️ Best season to fly (2024 climatology)
Monthly climate score: historical avg of temp, wind, rain and cloud cover. Green = optimal month.
⭐ Best month: Jul (88/100, 24°C, 80mm lluvia) · Worst month: Dec (35/100, 117mm lluvia)
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 7 | Medium |
| Avg thermal probability | 0.86 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.35 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
20 mn by foot from parking at Le Grand Ratz village, over La Placette pass, near Pommiers La Placette, north of Voreppe, 15 km NW of Grenoble Afternoon and evening take off. Caution with south wind, not detectable at take off ...
Nearby sites
Chalais (55) · La Grande Sure (56) · petit Montaud (44) · Charmant Som (47) · Montaud (42) · Charande-la moliere (50)