Sonnenberg
📍 Solothurn , Bezirk Thal · Nearest city: Matzendorf (3 km)
59 XC score / 100 · takeoff at 1156 m · 📍 View on map
Coordinates and external links
47.32470, 7.60380Forecast next days
Updated: 2026-04-21 01:19 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Flyable day, decent conditions, cloud base ~1175 m, wind 18 km/h.
base ~1175m · wind 18 km/hFlyable day, decent conditions, cloud base ~1100 m, wind 22 km/h.
base ~1100m · wind 22 km/hMarginal conditions, cloud base ~2168 m, wind 18 km/h.
base ~2168m · wind 18 km/hComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
Detailed hourly weather
2026-04-21❌ Not recommended · peak 60 at 15h
- Very stable day (CAPE<50, LI>2) — no thermals
- High cloud suck (85/100) — base below freezing with CU
| 08 35 | 09 35 ☁️⚠️ | 10 35 ☁️⚠️ | 11 35 ☁️⚠️ | 12 40 ☁️⚠️ | 13 40 ☁️⚠️ | 14 35 ☁️⚠️ | 15 60 ☁️⚠️ | 16 60 ☁️⚠️ | 17 60 ☁️⚠️ | 18 55 ☁️⚠️ | 19 35 ☁️⚠️ | 20 35 ☁️⚠️ |
Peak 15h: CAPE 10 J/kg · LI 3.6 · BL top 1590 m · w* 0.0 m/s · cloud base 2443 m · 0°C at 1750 m · Pro score 58/100 · sun 30° 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: 15:00 (peak of the day)
Surface T: 10.1°C · Td: -0.2°C
LCL (cloud base): 1287 m
BL top: 1590 m
0°C level: 1750 m
Approximate profile from surface variables + synoptic levels. Red lines = temperature, dashed blue = dew point. Orange bands = detected inversions.
🌬 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
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 12 | High |
| Avg thermal probability | 0.77 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.45 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
Launch site of the local flying school. Please ask for permission before flying: www.flugschule-jura.ch
Nearby sites
Obere Wengi (64) · Hohe Winde (47) · Laupersdoerfer Stierenberg (51) · Brandberg (62) · Landeplatz Glutzenberg (5) · Niderwiler Stierenberg (50)