Gemsstock
📍 Uri · Nearest city: Andermatt (4 km)
71 XC score / 100 · takeoff at 2900 m · 📍 View on map
Coordinates and external links
46.60410, 8.61159Forecast next days
Updated: 2026-04-19 16:01 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Día volable, condiciones decentes, base de cúmulos ~481 m, viento 18 km/h.
base ~481m · wind 18 km/hDía muy favorable para XC, base de cúmulos ~705 m, viento 14 km/h.
base ~705m · wind 14 km/hDía muy favorable para XC, base de cúmulos ~1668 m, viento 11 km/h.
base ~1668m · 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⚠️ Marginal · peak 60 at 14h
- Cloud suck alto (100/100) — base bajo freezing con CU
| 08 50 ☁️⚠️ | 09 50 ☁️⚠️ | 10 50 ☁️⚠️ | 11 50 ☁️⚠️ | 12 50 ☁️⚠️ | 13 50 ☁️⚠️ | 14 60 ☁️⚠️ | 15 50 ☁️⚠️ 🏔️ | 16 50 ☁️⚠️ | 17 40 ☁️⚠️ 🏔️ | 18 45 ☁️⚠️ 🏔️ | 19 40 ☁️⚠️ | 20 40 ☁️⚠️ |
Peak 14h: CAPE 0 J/kg · LI 1.2 · BL top 1845 m · w* 0.0 m/s · cloud base 3925 m · 0°C at 2660 m · Pro score 82/100 · sun 35° over slope
2026-04-21⚠️ Marginal · peak 73 at 17h
- Cloud suck alto (91/100) — base bajo freezing con CU
| 08 35 ☁️⚠️ | 09 55 ☁️⚠️ | 10 50 ☁️⚠️ | 11 50 ☁️⚠️ | 12 50 ☁️⚠️ | 13 55 ☁️⚠️ | 14 55 ☁️⚠️ | 15 58 ☁️⚠️ | 16 63 ☁️⚠️ | 17 73 ☁️⚠️ | 18 55 ☁️⚠️ | 19 50 ☁️⚠️ | 20 50 ☁️⚠️ |
Peak 17h: CAPE 10 J/kg · LI -0.2 · BL top 940 m · w* 0.0 m/s · cloud base 3950 m · 0°C at 2070 m · Pro score 72/100 · sun 17° 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: -1.4°C · Td: -9.6°C
LCL (cloud base): 1025 m
BL top: 1845 m
0°C level: 2660 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 | 6 km/h W | gust 26 | 12 km/h NW | gust 27 | 17 km/h NW | gust 38 |
| 2026-04-21 | 8 km/h NE | gust 22 | 8 km/h NW | gust 25 | 13 km/h N | gust 28 |
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) | 4 | Medium |
| Avg thermal probability | 0.71 | Based on thousands of aggregated IGC flights |
| Solar orientation | 1.00 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Upcoming competitions in this country
- PWCA Italy Gemona 2026 · 2026-07-25 – 2026-08-01 · PWCA
Copa del Mundo en Gemona del Friuli, Italia
Pilot comments
More info on http://www.flyland.ch. Airspaces in Switzerland are a thought subject, get all the info you can get befire flying.
Nearby sites
Gurschen (38) · Gütsch / Nätschen (48) · Göscheneralpsee (42) · Alp Culmatsch (48) · Sunnig Grat (52) · Alp Tgom, Sedrun (48)