Acceptable conditions

Mervelier — 757m

Jura · Orientation W
55%
Local flying
Best window: 9h — 20h
Local flying reaches 55% because launch wind and basic weather stay usable, but the day does not generate enough lift to feel easy or rewarding for long.
Local window 9h — 20hXC window No clear XC window
Forecast-based estimate — not a flight clearance. Always check live conditions and assess on site.
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Send this forecast to a flying buddy.
Launch wind
12 km/h
W · 273°
Gust spread
32 km/h
rough launch feel
Lift quality
0.1 m/s
0/5 climb support
Cloud base
1380 m
41.3 km
Precipitation risk
Dry
no signal
Acceptable conditions

Mervelier — 757m

Jura · Orientation W

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Send this forecast to a flying buddy.

Hourly windows

2026-08-18 · Local flying
6h
🌙
NIGHT
7h
☁️
MARGINAL
8h
☁️
MARGINAL
9h
⛅
GO
10h
⛅
GO
11h
⛅
GO
12h
☁️
GO
13h
☁️
GO
14h
☁️
GO
15h
☁️
GO
16h
☁️
GO
17h
☁️
GO
18h
☁️
GO
19h
☁️
GO
20h
☁️
GO
Best window: 9h — 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
——
807m
997m
2242m
2457m
2582m
2652m
2562m
2627m
2682m
2542m
2022m
Base
clouds
——
1282m
1445m
1720m
1957m
2120m
2157m
2245m
2332m
2432m
2419m
2332m
3600m
↘
52
↘
52
↘
51
↘
48
↘
44
↘
42
↘
43
↘
45
↘
46
↘
46
↘
45
↘
44
↘
44
3400m
↘
46
↘
46
↘
47
↘
45
↘
42
↘
41
↘
41
↘
43
↘
43
↘
43
↘
42
↘
42
↘
42
3200m
↘
40
↘
41
↘
42
↘
41
↘
41
↘
40
↘
40
↘
41
↘
40
↘
40
↘
39
↘
39
↘
40
3000m
↘
36
↘
38
↘
39
↘
39
↘
39
↘
38
↘
38
↘
38
↘
37
↘
36
↘
36
↘
36
↘
36
2800m
↘
34
↘
35
↘
37
↘
37
↘
37
↘
36
↘
35
↘
35
↘
34
↘
33
→
32
→
32
→
32
2600m
↘
31
↘
32
↘
35
↘
35
↘
35
↘
34
↘
33
↘
32
→
31
→
29
→
28
→
28
→
28
2400m
↘
28
→
29
↘
33
↘
33
↘
33
↘
32
↘
30
→
29
→
27
→
26
→
25
→
24
→
24
2200m
→
25
→
26
↘
30
↘
31
↘
31
↘
29
→
27
→
25
→
24
→
22
↗
21
↗
20
→
20
2000m
→
23
→
24
↘
29
→
29
→
29
→
27
→
25
→
23
→
21
↗
19
↗
18
↗
17
→
16
1800m
→
24
→
25
→
29
→
28
→
27
→
25
→
23
→
21
→
19
→
18
→
18
→
17
→
17
1600m
→
25
→
27
→
28
→
28
→
25
→
23
→
21
→
19
→
18
→
17
→
17
→
18
→
18
1400m
→
23
→
25
→
26
→
26
→
24
→
22
→
20
→
18
→
17
→
16
→
17
→
18
→
18
1200m
→
20
→
21
→
23
→
23
→
22
→
21
→
19
→
17
→
16
→
16
→
17
→
18
→
18
1000m
→
16
→
17
→
18
→
19
→
20
→
20
→
18
→
16
→
15
→
15
→
17
→
18
→
17
800mLAUNCH
↗
10
↗
11
→
11
→
12
→
16
→
17
→
16
→
14
→
12
→
13
→
15
→
16
→
15
600m
↗
7
↗
7
↗
6
→
8
→
12
→
15
→
14
→
12
→
11
→
12
→
13
→
14
→
12
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 77h 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.