Flying not recommended

Grand Ballon — 1424m

Vosges · Orientation W, S
25%
Local flying
Best window: 18h — 20h
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 18h — 20hXC window No clear XC windowWatch-out: Wind gusts too strong
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Launch wind
17 km/h
SW · 236°
Gust spread
59 km/h
rough launch feel
Lift quality
0.3 m/s
2/5 climb support
Cloud base
1013 m
14.0 km
Precipitation risk
0.1 mm/h
light showers possible
Flying not recommended

Grand Ballon — 1424m

Vosges · Orientation W, S

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Hourly windows

2026-05-04 · Local flying
6h
🌙
NIGHT
7h
☁️
MARGINAL
8h
☁️
MARGINAL
9h
⛅
MARGINAL
10h
⛅
MARGINAL
11h
⛅
NO-GO
gusts
12h
⛅
NO-GO
gusts
13h
⛅
NO-GO
gusts
14h
⛅
NO-GO
gusts
15h
☁️
NO-GO
gusts
16h
☁️
NO-GO
gusts
17h
☁️
NO-GO
gusts
18h
⛅
GO
19h
⛅
GO
20h
⛅
GO
Best window: 18h — 20h
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
——
1799m
1594m
1669m
1764m
1854m
1924m
1959m
1949m
1909m
1849m
1784m
Base
clouds
——
2011m
2149m
2312m
2474m
2512m
2462m
2424m
2424m
2449m
2462m
2424m
3600m
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45
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3400m
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3200m
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3000m
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2800m
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52
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2600m
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52
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2400m
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52
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48
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48
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2200m
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51
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51
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49
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46
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48
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48
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43
2000m
↗
51
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51
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51
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48
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44
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42
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44
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47
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49
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49
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41
1800m
↗
47
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48
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48
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46
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42
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40
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40
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40
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40
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37
1600m
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43
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40
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38
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35
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34
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1400mLAUNCH
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36
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39
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40
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40
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38
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36
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33
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30
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28
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30
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30
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29
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

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.