Marginal conditions

Montmelon W — 879m

Jura · Orientation SW, W, NW
48%
Local flying
Best window: 16h — 17h
Local flying reaches 48% 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 16h — 17hXC window No clear XC window
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Launch wind
4 km/h
W · 269°
Gust spread
18 km/h
rough launch feel
Lift quality
0.1 m/s
0/5 climb support
Cloud base
748 m
27.5 km
Precipitation risk
0.1 mm/h
light showers possible
Marginal conditions

Montmelon W — 879m

Jura · Orientation SW, W, NW

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Hourly windows

2026-05-04 · Local flying
6h
🌙
NIGHT
7h
☁️
MARGINAL
8h
☁️
MARGINAL
9h
🌧
MARGINAL
10h
🌧
MARGINAL
11h
🌧
MARGINAL
12h
☁️
MARGINAL
13h
☁️
MARGINAL
14h
☁️
MARGINAL
15h
☁️
MARGINAL
16h
☁️
GO
17h
☁️
GO
18h
🌧
MARGINAL
19h
🌧
MARGINAL
20h
🌧
MARGINAL
Best window: 16h — 17h
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
——
1079m
1169m
1294m
1429m
1554m
1644m
1674m
1629m
1519m
1374m
1219m
Base
clouds
——
1117m
1216m
1417m
1566m
1654m
1717m
1717m
1692m
1629m
1554m
1442m
3600m
↗
37
↗
35
↗
33
↗
32
↗
30
↗
29
↑
28
↑
27
↑
26
↗
24
↗
22
↗
20
↑
18
3400m
↗
38
↗
36
↗
34
↗
31
↗
30
↑
28
↑
27
↑
26
↑
24
↑
23
↗
20
↗
19
↑
16
3200m
↗
40
↗
37
↗
34
↗
31
↗
29
↑
27
↑
26
↑
25
↑
23
↑
21
↑
19
↑
17
↑
15
3000m
↗
41
↗
38
↗
34
↗
31
↑
29
↑
26
↑
25
↑
24
↑
22
↑
20
↑
17
↑
15
↑
14
2800m
↗
41
↗
38
↗
35
↗
32
↗
29
↑
27
↑
25
↑
23
↑
20
↑
18
↑
15
↑
13
↑
12
2600m
↗
41
↗
39
↗
35
↗
32
↗
30
↑
27
↑
24
↑
21
↑
19
↑
16
↑
13
↑
11
↑
10
2400m
↗
41
↗
39
↗
36
↗
33
↗
30
↗
27
↑
24
↑
20
↑
17
↑
14
↑
12
↑
10
↑
9
2200m
↗
41
↗
39
↗
36
↗
34
↗
31
↗
28
↑
24
↑
19
↑
15
↑
12
↑
10
↑
8
↗
7
2000m
↗
41
↗
40
↗
37
↗
34
↗
31
↗
28
↗
24
↑
18
↑
14
↑
10
↑
8
↑
6
↗
6
1800m
↗
40
↗
39
↗
37
↗
33
↗
30
↗
26
↗
21
↗
16
↗
11
↗
8
↗
7
↗
6
↗
6
1600m
↗
39
↗
38
↗
36
↗
32
↗
27
↗
23
↗
18
↗
13
↗
9
↗
6
↗
6
↗
6
→
8
1400m
↗
36
↗
35
↗
33
↗
29
↗
24
↗
19
↗
15
↗
10
↗
7
↗
5
→
5
→
7
→
10
1200m
↗
28
↗
26
↗
23
↗
20
↗
16
↗
13
↗
10
↗
7
↗
6
→
5
→
6
→
9
→
12
1000m
↗
20
↗
16
↗
14
↗
11
↗
9
↗
7
→
6
↗
5
→
5
→
5
↘
8
↘
11
→
15
800mLAUNCH
↗
11
↗
8
↗
6
↗
5
↗
5
→
5
→
5
→
4
→
4
→
5
→
8
↘
11
→
14
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 12:38
⚠️ This report is informational only. The final decision to fly always rests with the pilot on site.