Plan Praz/ Brevent (Chamonix)
📍 Rhone-Alpes , Departement de la Haute-Savoie · Nearest city: Chamonix-Mont-Blanc (2 km)
56 XC score / 100 · takeoff at 1927 m · 📍 View on map
Coordinates and external links
45.93560, 6.85500Forecast next days
Updated: 2026-04-19 16:11 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Día muy favorable para XC, base de cúmulos ~1484 m, viento 14 km/h.
base ~1484m · wind 14 km/hDía muy favorable para XC, base de cúmulos ~1402 m, viento 14 km/h.
base ~1402m · wind 14 km/hDía muy favorable para XC, base de cúmulos ~1843 m, viento 11 km/h.
base ~1843m · wind 11 km/hComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
Detailed hourly weather
2026-04-20❌ Not recommended · peak 55 at 14h
- Cobertura nubosa >85% — sin radiación para disparar
- Cloud suck alto (100/100) — base bajo freezing con CU
| 08 50 ☁️⚠️ | 09 50 ☁️⚠️ | 10 50 ☁️⚠️ | 11 50 ☁️⚠️ | 12 50 ☁️⚠️ | 13 50 ☁️⚠️ | 14 55 ☁️⚠️ | 15 55 ☁️⚠️ | 16 35 ☁️⚠️ | 17 45 ☁️⚠️ | 18 55 ☁️⚠️ | 19 45 ☁️⚠️ | 20 50 |
Peak 14h: CAPE 10 J/kg · LI 0.9 · BL top 1235 m · w* 0.0 m/s · cloud base 3902 m · 0°C at 2640 m · Pro score 60/100 · sun 36° over slope
2026-04-21❌ Not recommended · peak 60 at 14h
- Día muy estable (CAPE<50, LI>2) — sin térmicas
- Cloud suck alto (93/100) — base bajo freezing con CU
| 08 30 ☁️⚠️ | 09 30 ☁️⚠️ | 10 50 ☁️⚠️ | 11 50 ☁️⚠️ | 12 50 ☁️⚠️ | 13 55 ☁️⚠️ | 14 60 ☁️⚠️ | 15 60 ☁️⚠️ | 16 50 ☁️⚠️ | 17 50 ☁️⚠️ | 18 30 ☁️⚠️ | 19 35 ☁️⚠️ | 20 30 ☁️⚠️ |
Peak 14h: CAPE 10 J/kg · LI 2.6 · BL top 1420 m · w* 0.0 m/s · cloud base 4177 m · 0°C at 2650 m · Pro score 66/100 · sun 36° over slope
Hourly flyability (0–100). ⛈️ = storm risk · ☁️⚠️ = cloud suck · 🏔️ = active ridge lift. CAPE = convective energy, LI = stability, BL top = thermal ceiling, w* = estimated dry thermal velocity. Source: Open-Meteo (ECMWF/GFS/ICON blend model).
Estimated vertical profile (Sounding)
Reference time: 14:00 (peak of the day)
Surface T: 8.4°C · Td: -7.4°C
LCL (cloud base): 1975 m
BL top: 1235 m
0°C level: 2640 m
Approximate profile from surface variables + synoptic levels. Red lines = temperature, dashed blue = dew point. Orange bands = detected inversions.
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 8 | High |
| Avg thermal probability | 0.84 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.30 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
ATTN: South TO: you must pass UNDERNEATH the cables of the 'le Brevent'-cable car! (> see pix!)
Rules and notes
Do not fly to the west closer than 300m to the ground. >> July-August: be aware of no-fly-zone on south side of Chamonix (Mont Blanc -Aiguille du Midi)! (> see pix) >> LF R-30A active year round!! (> see pix!)
Nearby sites
Flegere (65) · Aiguillette (les Houches) (59) · Plan de l'Aiguille (Chamonix) (50) · Tete noire de Pormenaz (48) · Aiguille du Midi -S / N (61) · Mont Blanc (56)