Marginal conditions

Petit Ballon — 1267m

Vosges · Orientation W, S
45%
Local flying
Best window: 14h — 14h
Local flying reaches 45% because the launch setup looks mostly workable, while lift quality and timing are what keep the score from climbing higher.
Local window 14h — 14hXC window No clear XC window
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Launch wind
8 km/h
SW · 233°
Gust spread
40 km/h
rough launch feel
Lift quality
0.2 m/s
2/5 climb support
Cloud base
802 m
14.0 km
Precipitation risk
0.2 mm/h
light showers possible
Marginal conditions

Petit Ballon — 1267m

Vosges · Orientation W, S

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Hourly windows

2026-05-04 · Local flying
6h
🌙
NIGHT
7h
🌦
NO-GO
8h
🌦
NO-GO
9h
☁️
MARGINAL
10h
☁️
MARGINAL
11h
☁️
MARGINAL
12h
☁️
MARGINAL
13h
☁️
MARGINAL
14h
☁️
GO
15h
🌦
MARGINAL
16h
🌦
MARGINAL
17h
🌦
MARGINAL
18h
🌦
MARGINAL
19h
🌦
MARGINAL
20h
🌦
MARGINAL
Best window: 14h — 14h
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
——
1392m
1437m
1512m
1607m
1697m
1767m
1802m
1792m
1752m
1692m
1627m
Base
clouds
——
1605m
1667m
1792m
1880m
2030m
2167m
2267m
2230m
2117m
1967m
1817m
3600m
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36
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38
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32
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30
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27
3400m
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38
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37
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3200m
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40
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3000m
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41
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41
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40
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38
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37
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36
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35
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34
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2800m
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41
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41
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38
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36
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35
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34
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33
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26
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2600m
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41
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40
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38
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37
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35
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33
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32
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30
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2400m
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41
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40
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37
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30
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25
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2200m
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41
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37
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34
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31
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29
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28
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25
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24
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18
2000m
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41
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39
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36
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33
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30
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27
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25
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23
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21
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19
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18
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16
1800m
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40
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38
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35
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31
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28
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25
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23
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20
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19
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17
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16
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15
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14
1600m
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38
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36
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34
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30
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26
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22
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20
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18
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16
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15
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13
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13
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14
1400m
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33
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32
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30
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26
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22
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19
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17
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15
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14
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13
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12
→
12
→
13
1200mLAUNCH
↗
23
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22
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20
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18
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17
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15
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15
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14
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12
→
12
→
12
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 12:39
⚠️ This report is informational only. The final decision to fly always rests with the pilot on site.