About this assessment
This risk assessment is based on the WOWD 'WIS en WAS' research (2008), conducted by the Scientific Research Animal Welfare Pigeons committee of the NPO. The study analyzed 287 race flights (2002-2005) and identified which weather and flight factors influence the return of pigeons.
Criteria per factor
Factor
Favorable
Neutral
Some risk
Risk
Wind
W-N 1-3 Bft, S-W 1-6 Bft
-
N-SE direction, W-N 4-5 Bft, variable 0-2 Bft
W-N 6+ Bft, >= 7 Bft
Temperature
15-20°C
10-15°C, 20-25°C
26-28°C (24-26°C young birds), < 10°C
>= 29°C (>= 27°C young birds)
Humidity
60-75%
75-90%
< 60% of > 90%
-
Cloud cover
0-5/8
6-7/8, or mainly high clouds
8/8
Low clouds >= 80% (blocks UV)
Precipitation
Dry
Showers with clearing
Many showers
Rain/thunderstorm
Visibility
>= 10 km
7-10 km
5-7 km
< 5 km / fog
UV-index
-
2-5
>= 6, or UV < 2 (weak orientation)
-
Air pressure
>= 1020 hPa
1000-1020 hPa
<= 1000 hPa
-
Inversion
-
-
>= 25°C + calm + clear
>= 28°C + windstill + cloudless
Combination
-
-
>= 4 risk points combined
Headwind + clouds + precipitation
Source: WOWD/NPO - Effects of weather elements, geomagnetic disturbances and other factors on the return of racing pigeons (2008).
Inversion detection and cloud layer analysis based on Van Breemen & Land release manual. Not automatically available: frontal disturbances, thermals and geomagnetic field (K-index).
Morlincourt (0 km)
Some risk
Cloud cover: 100% (8/8)
UV index: UV-index 1
08:00 - Some risk
Wind:
W 3 Bft (16.4 km/u)
Rugwind W 3 Bft (Z-W 1-6 Bft)
Temperature:
14.5°C
Fris (10-15°C)
Humidity:
84%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
14.6 km
Goed zicht (>= 10 km)
UV index:
UV-index 1
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1018.2 hPa
Normaal (1000-1020 hPa)
09:00 - Some risk
Wind:
W 3 Bft (17.4 km/u)
Rugwind W 3 Bft (Z-W 1-6 Bft)
Temperature:
15.1°C
Ideaal (15-20°C)
Humidity:
80%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
32 km
Goed zicht (>= 10 km)
UV index:
UV-index 2
Normaal (2-5)
Air pressure:
1018.4 hPa
Normaal (1000-1020 hPa)
10:00 - Neutral
Wind:
W 3 Bft (19.3 km/u)
Rugwind W 3 Bft (Z-W 1-6 Bft)
Temperature:
16.1°C
Ideaal (15-20°C)
Humidity:
74%
Goed (60-75%)
Cloud cover:
74% (6/8)
Zwaar bewolkt (6-7/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
32 km
Goed zicht (>= 10 km)
UV index:
UV-index 3.1
Normaal (2-5)
Air pressure:
1018.4 hPa
Normaal (1000-1020 hPa)
Cambrai (71 km)
Some risk
Cloud cover: 100% (8/8)
UV index: UV-index 1
08:00 - Some risk
Wind:
W 4 Bft (20.9 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
13.7°C
Fris (10-15°C)
Humidity:
86%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
16.6 km
Goed zicht (>= 10 km)
UV index:
UV-index 1
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1004.1 hPa
Normaal (1000-1020 hPa)
09:00 - Some risk
Wind:
W 4 Bft (20.9 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
14.1°C
Fris (10-15°C)
Humidity:
82%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
20.5 km
Goed zicht (>= 10 km)
UV index:
UV-index 1.5
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1004.2 hPa
Normaal (1000-1020 hPa)
10:00 - Some risk
Wind:
W 4 Bft (24.2 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
15.1°C
Ideaal (15-20°C)
Humidity:
76%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
30.9 km
Goed zicht (>= 10 km)
UV index:
UV-index 2.3
Normaal (2-5)
Air pressure:
1004.4 hPa
Normaal (1000-1020 hPa)
Braine-le-Comte (142 km)
Some risk
Cloud cover: 100% (8/8)
UV index: UV-index 1.9
09:00 - Some risk
Wind:
WZW 3 Bft (18.7 km/u)
Rugwind WZW 3 Bft (Z-W 1-6 Bft)
Temperature:
13.7°C
Fris (10-15°C)
Humidity:
88%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0.2 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
8 km
Redelijk zicht (7-10 km)
UV index:
UV-index 1.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1003.3 hPa
Normaal (1000-1020 hPa)
10:00 - Some risk
Wind:
W 4 Bft (20.7 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
14.6°C
Fris (10-15°C)
Humidity:
81%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0.2 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
12.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 2.9
Normaal (2-5)
Air pressure:
1003.4 hPa
Normaal (1000-1020 hPa)
11:00 - Some risk
Wind:
W 4 Bft (21.2 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
14.9°C
Fris (10-15°C)
Humidity:
75%
Vochtig (75-90%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
18.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 4.3
Normaal (2-5)
Air pressure:
1003.7 hPa
Normaal (1000-1020 hPa)
Herenthout (213 km)
Some risk
Wind: W 4 Bft (24 km/u)
Cloud cover: 100% (8/8)
10:00 - Neutral
Wind:
W 4 Bft (22.8 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
16.6°C
Ideaal (15-20°C)
Humidity:
72%
Goed (60-75%)
Cloud cover:
65% (5/8)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
29.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 3.2
Normaal (2-5)
Air pressure:
1018.2 hPa
Normaal (1000-1020 hPa)
11:00 - Some risk
Wind:
W 4 Bft (24 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
16.8°C
Ideaal (15-20°C)
Humidity:
67%
Goed (60-75%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
21.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 4.2
Normaal (2-5)
Air pressure:
1018.6 hPa
Normaal (1000-1020 hPa)
12:00 - Some risk
Wind:
W 4 Bft (23.2 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
16.4°C
Ideaal (15-20°C)
Humidity:
65%
Goed (60-75%)
Cloud cover:
100% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
32.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 5.9
Normaal (2-5)
Air pressure:
1018.9 hPa
Normaal (1000-1020 hPa)
Sint-Michielsgestel (284 km)
Some risk
Wind: W 4 Bft (26.2 km/u)
UV index: UV-index 6.6
11:00 - Some risk
Wind:
W 4 Bft (26.2 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
16.2°C
Ideaal (15-20°C)
Humidity:
77%
Vochtig (75-90%)
Cloud cover:
27% (2/8)
Licht bewolkt (0-5/8)
Precipitation:
0.7 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
9.7 km
Redelijk zicht (7-10 km)
UV index:
UV-index 4.7
Normaal (2-5)
Air pressure:
1017.7 hPa
Normaal (1000-1020 hPa)
12:00 - Some risk
Wind:
W 4 Bft (27 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
16.4°C
Ideaal (15-20°C)
Humidity:
68%
Goed (60-75%)
Cloud cover:
30% (2/8)
Licht bewolkt (0-5/8)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
27.6 km
Goed zicht (>= 10 km)
UV index:
UV-index 5.9
Normaal (2-5)
Air pressure:
1018 hPa
Normaal (1000-1020 hPa)
13:00 - Some risk
Wind:
W 4 Bft (26.1 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
16.9°C
Ideaal (15-20°C)
Humidity:
60%
Goed (60-75%)
Cloud cover:
55% (4/8)
Licht bewolkt (0-5/8)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
8.5 km
Redelijk zicht (7-10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1018.4 hPa
Normaal (1000-1020 hPa)
Apeldoorn (354 km)
Some risk
Wind: WNW 4 Bft (25.8 km/u)
Visibility: 6.7 km
UV index: UV-index 6.6
Cloud cover: 95% (8/8)
Combination: 4 risicopunten gelijktijdig
12:00 - Some risk
Wind:
WNW 4 Bft (25.8 km/u)
Kopwind WNW 4 Bft (W-N 4-5 Bft)
Temperature:
16°C
Ideaal (15-20°C)
Humidity:
66%
Goed (60-75%)
Cloud cover:
85% (7/8)
Zwaar bewolkt (6-7/8)
Precipitation:
0.3 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
6.7 km
Matig zicht (5-7 km)
UV index:
UV-index 5.9
Normaal (2-5)
Air pressure:
1012.1 hPa
Normaal (1000-1020 hPa)
13:00 - Some risk
Wind:
WNW 4 Bft (22.3 km/u)
Kopwind WNW 4 Bft (W-N 4-5 Bft)
Temperature:
15°C
Ideaal (15-20°C)
Humidity:
71%
Goed (60-75%)
Cloud cover:
62% (5/8)
Licht bewolkt (0-5/8)
Precipitation:
0.4 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
9.9 km
Redelijk zicht (7-10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1012.5 hPa
Normaal (1000-1020 hPa)
14:00 - Some risk
Wind:
WNW 4 Bft (23.7 km/u)
Kopwind WNW 4 Bft (W-N 4-5 Bft)
Temperature:
14.9°C
Fris (10-15°C)
Humidity:
70%
Goed (60-75%)
Cloud cover:
95% (8/8)
Geheel bewolkt (8/8)
Precipitation:
0.3 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
6.1 km
Matig zicht (5-7 km)
UV index:
UV-index 6.9
UV hoog (>= 6)
Air pressure:
1012.9 hPa
Normaal (1000-1020 hPa)
Combination:
4 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)