Flying not recommended

Grand Ballon — 1424m

Vosges · Orientation W, S
25%
Local flying
Best window: 6h — 13h
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 6h — 13hXC window No clear XC windowWatch-out: Wind gusts too strong
Forecast-based estimate — not a flight clearance. Always check live conditions and assess on site.
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Launch wind
14 km/h
W · 274°
Gust spread
45 km/h
rough launch feel
Lift quality
0.1 m/s
0/5 climb support
Cloud base
1263 m
40.4 km
Precipitation risk
Dry
no signal
Flying not recommended

Grand Ballon — 1424m

Vosges · Orientation W, S

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Send this forecast to a flying buddy.

Hourly windows

2026-08-18 · Local flying
6h
🌙
NIGHT
7h
☁️
GO
8h
☁️
GO
9h
☁️
GO
10h
☁️
GO
11h
☁️
GO
12h
☁️
GO
13h
☁️
GO
14h
☁️
NO-GO
gusts
15h
☁️
NO-GO
gusts
16h
☁️
GO
17h
☁️
GO
18h
🌤
GO
19h
🌤
GO
20h
🌤
GO
Best window: 6h — 13h
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
——
1624m
2519m
2854m
2874m
2854m
2779m
2809m
2779m
2739m
2679m
2589m
Base
clouds
——
2062m
2199m
2386m
2549m
2662m
2749m
2787m
2837m
2836m
2787m
2687m
3600m
↘
56
↘
56
↘
56
↘
53
↘
49
↘
47
↘
47
↘
47
↘
48
↘
48
↘
48
↘
49
↘
49
3400m
↘
51
↘
52
↘
53
↘
51
↘
47
↘
45
↘
45
↘
46
↘
46
↘
46
↘
46
↘
46
↘
47
3200m
↘
46
↘
47
↘
50
↘
48
↘
45
↘
43
↘
43
↘
44
↘
45
↘
45
↘
44
↘
44
↘
45
3000m
↘
42
↘
44
↘
46
↘
45
↘
43
↘
41
↘
41
↘
41
↘
42
↘
41
↘
40
↘
40
↘
42
2800m
↘
38
↘
41
↘
43
↘
42
↘
40
↘
39
↘
38
↘
38
↘
38
↘
37
↘
36
↘
36
↘
38
2600m
↘
35
↘
38
↘
39
↘
39
↘
38
↘
36
↘
36
↘
35
↘
34
↘
33
↘
31
↘
31
↘
35
2400m
↘
31
↘
35
↘
36
↘
36
↘
35
↘
34
↘
33
↘
32
↘
31
↘
29
↘
27
↘
27
↘
31
2200m
↘
28
↘
32
↘
32
↘
33
↘
32
↘
32
↘
30
↘
29
↘
27
↘
25
↘
22
↘
23
↘
28
2000m
↘
24
↘
29
↘
29
↘
30
↘
30
↘
29
→
28
→
26
→
24
→
22
→
19
→
19
→
25
1800m
→
23
→
27
→
26
→
26
→
26
→
26
→
25
→
25
→
25
→
23
→
21
→
21
→
25
1600m
→
22
→
25
→
22
→
23
→
23
→
23
→
23
→
24
→
25
→
24
→
23
→
22
→
24
1400mLAUNCH
→
18
→
20
→
18
→
19
→
20
→
21
→
22
→
24
→
24
→
24
→
23
→
23
→
24
1200m
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
Updated 78h ago

Sources: Open-Meteo (AROME 1.3km, ICON-D2 2km) · 2026-08-18
⚠️ This report is informational only. The final decision to fly always rests with the pilot on site.