Marginal conditions

Randonnaz — 1377m

Imported · Orientation SW · 225°
45%
Local flying
Best window: 9h — 11h
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 9h — 11hXC window No clear XC window
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Launch wind
4 km/h
NW · 297°
Gust spread
26 km/h
rough launch feel
Lift quality
0.3 m/s
2/5 climb support
Cloud base
1395 m
37.0 km
Precipitation risk
0.9 mm/h
becomes limiting
Marginal conditions

Randonnaz — 1377m

Imported · Orientation SW · 225°

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Hourly windows

2026-05-04 · Local flying
6h
🌙
NIGHT
7h
⛅
GO
8h
⛅
MARGINAL
9h
⛅
GO
10h
⛅
GO
11h
⛅
GO
12h
☁️
MARGINAL
13h
☁️
MARGINAL
14h
☁️
GO
15h
🌦
NO-GO
16h
🌦
NO-GO
17h
🌦
NO-GO
18h
⛈
MARGINAL
19h
⛈
NO-GO
20h
⛈
NO-GO
Best window: 9h — 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
——
1467m
1582m
1752m
2007m
2932m
3227m
3342m
3222m
2917m
2502m
2067m
Base
clouds
——
2002m
2240m
2677m
3002m
3102m
2977m
2815m
2565m
2265m
2040m
1902m
3600m
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17
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3400m
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3200m
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3000m
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2800m
↑
10
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2600m
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9
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8
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8
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9
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9
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9
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11
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9
2400m
↑
8
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8
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7
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7
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7
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6
→
7
→
8
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9
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10
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10
→
9
2200m
↑
7
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7
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6
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6
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5
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5
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4
→
5
→
7
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8
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9
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9
→
8
2000m
↑
6
↑
6
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5
↑
4
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3
↑
3
↗
2
↘
3
↘
5
↘
6
↘
8
↘
9
↘
7
1800m
↑
5
↑
5
↑
4
↑
4
↑
3
↗
2
→
2
↘
4
↘
5
↘
7
↘
8
↘
8
↘
6
1600m
↑
5
↑
4
↑
4
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3
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2
→
1
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2
↘
5
↘
6
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7
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8
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7
↘
6
1400mLAUNCH
↑
4
↑
4
↑
3
↑
2
↑
1
→
1
↘
2
↘
5
↘
7
↘
8
↘
8
↘
7
↘
5
1200m
↑
4
↑
3
↑
3
↑
2
↗
1
→
1
↘
2
↘
5
↘
7
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7
↘
8
↘
7
↘
5
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 21:57
⚠️ This report is informational only. The final decision to fly always rests with the pilot on site.