Pic du Merdanson - Arthez d'Asson
📍 Aquitaine , Departement des Pyrenees-Atlantiques · Nearest city: Asson (11 km)
63 XC score / 100 · takeoff at 1529 m · 📍 View on map
Coordinates and external links
43.05420, -0.29771Forecast next days
Updated: 2026-04-19 16:04 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Día muy favorable para XC, base de cúmulos ~813 m, viento 9 km/h.
base ~813m · wind 9 km/hDía muy favorable para XC, base de cúmulos ~1162 m, viento 5 km/h.
base ~1162m · wind 5 km/hDía muy favorable para XC, base de cúmulos ~868 m, viento 6 km/h, precipitación 1.8 mm, ¡atento a tormentas (CAPE alto)!.
base ~868m · wind 6 km/h · precip 1.8mmComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
Detailed hourly weather
2026-04-20🌟 Exceptional day · peak 80 at 12h
⏰ Useful window: 10:00 – 18:00
| 08 65 | 09 73 | 10 73 | 11 73 | 12 80 | 13 75 ⛈️ | 14 20 ⛈️ | 15 22 | 16 10 | 17 20 | 18 25 | 19 80 | 20 80 |
Peak 12h: CAPE 1210 J/kg · LI -2.1 · BL top 860 m · w* 8.0 m/s · cloud base 1929 m · 0°C at 3150 m · Pro score 81/100 · sun 43° over slope
2026-04-21🌟 Exceptional day · peak 80 at 12h
⏰ Useful window: 10:00 – 19:00
| 08 55 | 09 65 | 10 73 | 11 73 | 12 80 | 13 80 | 14 80 | 15 27 | 16 16 | 17 15 | 18 80 | 19 80 | 20 70 |
Peak 12h: CAPE 330 J/kg · LI -2.0 · BL top 1070 m · w* 8.0 m/s · cloud base 2666 m · 0°C at 3240 m · Pro score 90/100 · sun 44° 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: 12:00 (peak of the day)
Surface T: 13.6°C · Td: 10.4°C
LCL (cloud base): 399 m
BL top: 860 m
0°C level: 3150 m
Approximate profile from surface variables + synoptic levels. Red lines = temperature, dashed blue = dew point. Orange bands = detected inversions.
Wind chart — altitude × time
Color: green < 20 km/h · yellow 20-30 · red >40. Arrows point to where the wind is blowing. Each column = 1 hour. 4 altitudes: 10m surface, 80m first thermal, 1500m (850 hPa) thermal cruise, 3000m (700 hPa) top.
Wind next days (Open-Meteo model)
Wind rose 10m — 2026-04-20
| Date | Morning 08-12h | Midday 12-16h | Evening 16-20h | |||
|---|---|---|---|---|---|---|
| 2026-04-20 | 4 km/h NE | gust 22 | 8 km/h NE | gust 21 | 5 km/h NE | gust 22 |
| 2026-04-21 | 4 km/h S | gust 12 | 2 km/h NE | gust 19 | 3 km/h E | gust 23 |
Colors: green < 15 km/h (optimal) · orange 15-25 · red >25 (flying not recommended). ⚠️ = shear >25 km/h between 10m and 850 hPa (potentially broken thermals).
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 5 | Medium |
| Avg thermal probability | 0.78 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.75 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
Décollage du sommet toutes orientations
Nearby sites
Pic du Pas de Broc - Arthez d'Asson (61) · Pic de Miqueu - St Pé de Bigorre (32) · Col du Couraduque (58) · Aucun (56) · Montagne Verte (36) · Grange des Cinq Monts (44)