Flying not recommended

Grenchenberg Bützen — 1339m

Jura · Orientation SE, S
25%
Local flying
Best window: 10h — 11h
Local flying is limited first by wind gusts too strong. Outside of that constraint, some periods still look flyable, but the day is not broadly comfortable.
Local window 10h — 11hXC window No clear XC windowWatch-out: Wind gusts too strong
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Launch wind
9 km/h
SW · 211°
Gust spread
47 km/h
rough launch feel
Lift quality
0.4 m/s
2/5 climb support
Cloud base
932 m
31.1 km
Precipitation risk
0.3 mm/h
light showers possible
Flying not recommended

Grenchenberg Bützen — 1339m

Jura · Orientation SE, S

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Hourly windows

2026-05-04 · Local flying
6h
🌙
NIGHT
7h
🌦
MARGINAL
8h
🌦
MARGINAL
9h
⛅
MARGINAL
10h
⛅
GO
11h
⛅
GO
12h
⛅
MARGINAL
13h
⛅
MARGINAL
14h
⛅
NO-GO
gusts
15h
🌦
NO-GO
gusts
16h
🌦
NO-GO
17h
🌦
NO-GO
18h
🌤
NO-GO
19h
🌤
NO-GO
20h
🌤
NO-GO
Best window: 10h — 11h
AI analysis
No analysis available for this day.

📊 Wind & thermals aloft

🎓 Full view
💡
Overview: colored arrows show wind speed and direction. Yellow to orange cells highlight the active thermal layer. The LAUNCH line marks the takeoff altitude.
Alt.6h7h8h9h10h11h12h13h14h15h16h17h18h
Top
BLH
——
1424m
1674m
1909m
2174m
2419m
2599m
2674m
2614m
2444m
2214m
1964m
Base
clouds
——
1514m
1639m
1826m
1989m
2189m
2414m
2552m
2514m
2414m
2252m
2114m
3600m
↗
33
↗
35
↗
37
↗
38
↗
38
↗
40
↗
41
↗
44
↗
47
↗
49
↗
51
↗
51
↗
49
3400m
↗
33
↗
35
↗
37
↗
38
↗
39
↗
41
↗
42
↗
45
↗
47
↗
50
↗
51
↗
52
↗
50
3200m
↗
34
↗
35
↗
37
↗
39
↗
40
↗
42
↗
43
↗
46
↗
48
↗
50
↗
52
↗
53
↗
51
3000m
↗
33
↗
35
↗
37
↗
39
↗
40
↗
42
↗
43
↗
45
↗
47
↗
49
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51
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52
↗
50
2800m
↗
32
↗
33
↗
34
↗
37
↗
39
↗
40
↗
41
↗
43
↗
44
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46
↗
47
↗
47
↗
46
2600m
↗
30
↗
31
↗
32
↗
34
↗
37
↗
39
↗
40
↗
41
↗
42
↗
42
↗
42
↗
42
↗
42
2400m
↗
28
↗
29
↗
30
↗
32
↗
35
↗
37
↗
38
↗
38
↗
39
↗
39
↗
38
↗
38
↗
38
2200m
↗
27
↗
27
↗
28
↗
30
↗
33
↗
35
↗
36
↗
36
↗
36
↗
35
↗
34
↗
33
↗
34
2000m
↗
25
↗
25
↗
26
↗
28
↗
31
↗
33
↗
34
↗
34
↗
33
↗
32
↗
29
↗
28
↗
30
1800m
↗
22
↗
22
↗
23
↗
25
↗
28
↗
29
↗
30
↗
29
↗
29
↗
27
↗
25
↗
24
↗
26
1600m
↗
18
↗
19
↗
20
↗
22
↗
24
↗
25
↗
26
↗
25
↗
24
↗
22
↗
20
→
20
→
22
1400mLAUNCH
↗
14
↗
15
↗
16
↗
17
↗
19
↗
20
↗
21
↗
21
↗
21
↗
19
→
17
→
17
→
18
1200m
↑
10
↑
11
↑
11
↑
12
↑
13
↑
14
↗
16
↗
18
↗
20
↗
18
→
16
→
15
→
15
1000m
800m
600m
400m
200m
0m
0–56–1011–1516–2021–25>25km/hBLH topCloud baseThermals

💨 Wind at launch

🎓 Safety thresholds
💡
Mean wind is the constant speed. Gusts are sudden accelerations. Thresholds: 15 km/h = caution, 25 km/h = critical.

🌡 Temperature

🎓 Why it matters?
💡
Launch temperature affects your comfort and safety. Below 0°C, your fingers go numb and handling controls becomes difficult.

💧 Precipitation

🎓 Impact on the wing
⚠️
Golden rule: never fly in rain or snow. Water weighs down the wing (up to +5 kg), alters its aerodynamic profile and reduces lift. Snow can freeze on suspension lines.
Snow Rain/Showers

Sources: Open-Meteo (AROME 1.3km, ICON-D2 2km) · 2026-05-04 · Data fetched on 28 Apr at 18:29
⚠️ This report is informational only. The final decision to fly always rests with the pilot on site.