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).
Weert (0 km)
Risk
Wind: WNW 2 Bft (6.6 km/u)
Temperature: 29.8°C
Humidity: 59%
Precipitation: 0 mm (Onweer)
UV index: UV-index 6.6
Combination: 7 risicopunten gelijktijdig
14:00 - Risk
Wind:
WNW 2 Bft (6.6 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
29.8°C
Hittegolf risico (>= 29°C)
Humidity:
59%
Zeer droog (< 60%)
Cloud cover:
29% (laag 5%, midden 8%, hoog 19%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm (Onweer)
Onweer (>= 5 mm of onweer)
Visibility:
15.9 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1012.6 hPa
Normaal (1000-1020 hPa)
Combination:
7 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
15:00 - Risk
Wind:
WNW 2 Bft (7 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
29.4°C
Hittegolf risico (>= 29°C)
Humidity:
61%
Goed (60-75%)
Cloud cover:
37% (laag 5%, midden 8%, hoog 28%)
Licht bewolkt (0-5/8)
Precipitation:
0.8 mm (Onweer)
Onweer (>= 5 mm of onweer)
Visibility:
15.7 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1013 hPa
Normaal (1000-1020 hPa)
Combination:
6 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
16:00 - Some risk
Wind:
WNW 2 Bft (7.3 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
28.2°C
Warm (26-28°C)
Humidity:
66%
Goed (60-75%)
Cloud cover:
50% (laag 3%, midden 8%, hoog 43%)
Licht bewolkt (0-5/8)
Precipitation:
0.8 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
15.5 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.3
UV hoog (>= 6)
Air pressure:
1013.6 hPa
Normaal (1000-1020 hPa)
Maashorst (49 km)
Some risk
Wind: WNW 2 Bft (9.1 km/u)
Temperature: 28.8°C
UV index: UV-index 6.6
Inversion: 28.8°C, 9.1 km/u wind, 7% bewolking
Combination: 4 risicopunten gelijktijdig
14:00 - Some risk
Wind:
WNW 2 Bft (9.1 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
28.8°C
Warm (26-28°C)
Humidity:
60%
Goed (60-75%)
Cloud cover:
7% (laag 0%, midden 6%, hoog 1%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
34.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1014.3 hPa
Normaal (1000-1020 hPa)
Inversion:
28.8°C, 9.1 km/u wind, 7% bewolking
Inversie-condities mogelijk (>= 25°C + weinig wind + weinig bewolking)
Combination:
4 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
15:00 - Some risk
Wind:
WNW 2 Bft (9.5 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
28.4°C
Warm (26-28°C)
Humidity:
62%
Goed (60-75%)
Cloud cover:
15% (laag 0%, midden 7%, hoog 10%)
Licht bewolkt (0-5/8)
Precipitation:
0.6 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
29.7 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.6
UV hoog (>= 6)
Air pressure:
1014.7 hPa
Normaal (1000-1020 hPa)
Inversion:
28.4°C, 9.5 km/u wind, 15% bewolking
Inversie-condities mogelijk (>= 25°C + weinig wind + weinig bewolking)
Combination:
4 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
16:00 - Some risk
Wind:
NW 2 Bft (9.7 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
27.3°C
Warm (26-28°C)
Humidity:
66%
Goed (60-75%)
Cloud cover:
29% (laag 0%, midden 7%, hoog 27%)
Licht bewolkt (0-5/8)
Precipitation:
0.6 mm (Motregen)
Lichte buien (< 1 mm)
Visibility:
25.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.3
UV hoog (>= 6)
Air pressure:
1015.2 hPa
Normaal (1000-1020 hPa)
Ede (99 km)
Some risk
Wind: WNW 2 Bft (10.6 km/u)
Temperature: 27.5°C
Humidity: 57%
Precipitation: 2.5 mm (Regenbuien)
UV index: UV-index 6.7
Inversion: 27.5°C, 10.6 km/u wind, 20% bewolking
Combination: 6 risicopunten gelijktijdig
15:00 - Some risk
Wind:
WNW 2 Bft (10.6 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
27.5°C
Warm (26-28°C)
Humidity:
57%
Zeer droog (< 60%)
Cloud cover:
20% (laag 0%, midden 8%, hoog 12%)
Licht bewolkt (0-5/8)
Precipitation:
2.5 mm (Regenbuien)
Regen/buien (>= 1 mm)
Visibility:
30.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.7
UV hoog (>= 6)
Air pressure:
1015 hPa
Normaal (1000-1020 hPa)
Inversion:
27.5°C, 10.6 km/u wind, 20% bewolking
Inversie-condities mogelijk (>= 25°C + weinig wind + weinig bewolking)
Combination:
6 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
16:00 - Some risk
Wind:
WNW 2 Bft (11.6 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
26.3°C
Warm (26-28°C)
Humidity:
62%
Goed (60-75%)
Cloud cover:
35% (laag 0%, midden 7%, hoog 29%)
Licht bewolkt (0-5/8)
Precipitation:
2.5 mm (Regen)
Regen/buien (>= 1 mm)
Visibility:
25.4 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.2
UV hoog (>= 6)
Air pressure:
1015.5 hPa
Normaal (1000-1020 hPa)
Combination:
4 risicopunten gelijktijdig
Meerdere risicofactoren (>= 4 gecombineerde risicopunten)
17:00 - Some risk
Wind:
NW 3 Bft (12.7 km/u)
Lichte wind NW 3 Bft (W-N 1-3 Bft)
Temperature:
24.8°C
Aangenaam (20-25°C)
Humidity:
70%
Goed (60-75%)
Cloud cover:
54% (laag 0%, midden 5%, hoog 49%)
Licht bewolkt (0-5/8)
Precipitation:
2.5 mm (Regen)
Regen/buien (>= 1 mm)
Visibility:
20.7 km
Goed zicht (>= 10 km)
UV index:
UV-index 5.4
Normaal (2-5)
Air pressure:
1016.1 hPa
Normaal (1000-1020 hPa)
Dronten (148 km)
Some risk
Temperature: 25.6°C
Precipitation: 1.4 mm (Regen)
UV index: UV-index 6.7
15:00 - Some risk
Wind:
WNW 3 Bft (12.7 km/u)
Lichte wind WNW 3 Bft (W-N 1-3 Bft)
Temperature:
25.6°C
Koud (< 10°C)
Humidity:
63%
Goed (60-75%)
Cloud cover:
25% (laag 1%, midden 18%, hoog 15%)
Licht bewolkt (0-5/8)
Precipitation:
1.4 mm (Regen)
Regen/buien (>= 1 mm)
Visibility:
22.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.7
UV hoog (>= 6)
Air pressure:
1017.9 hPa
Normaal (1000-1020 hPa)
16:00 - Some risk
Wind:
WNW 3 Bft (13.1 km/u)
Lichte wind WNW 3 Bft (W-N 1-3 Bft)
Temperature:
24.5°C
Aangenaam (20-25°C)
Humidity:
68%
Goed (60-75%)
Cloud cover:
41% (laag 1%, midden 29%, hoog 32%)
Licht bewolkt (0-5/8)
Precipitation:
1.4 mm (Regen)
Regen/buien (>= 1 mm)
Visibility:
18.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 6.3
UV hoog (>= 6)
Air pressure:
1018.5 hPa
Normaal (1000-1020 hPa)
17:00 - Some risk
Wind:
WNW 3 Bft (13.8 km/u)
Lichte wind WNW 3 Bft (W-N 1-3 Bft)
Temperature:
23°C
Aangenaam (20-25°C)
Humidity:
75%
Vochtig (75-90%)
Cloud cover:
60% (laag 2%, midden 42%, hoog 53%)
Licht bewolkt (0-5/8)
Precipitation:
1.4 mm (Regen)
Regen/buien (>= 1 mm)
Visibility:
14.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 5.4
Normaal (2-5)
Air pressure:
1019.1 hPa
Normaal (1000-1020 hPa)
Oppenhuizen (198 km)
Some risk
Wind: W 2 Bft (11.4 km/u)
16:00 - Neutral
Wind:
W 3 Bft (13.5 km/u)
Rugwind W 3 Bft (Z-W 1-6 Bft)
Temperature:
24.6°C
Aangenaam (20-25°C)
Humidity:
70%
Goed (60-75%)
Cloud cover:
51% (laag 10%, midden 16%, hoog 37%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
26.8 km
Goed zicht (>= 10 km)
UV index:
UV-index 5.3
Normaal (2-5)
Air pressure:
1018 hPa
Normaal (1000-1020 hPa)
17:00 - Neutral
Wind:
W 3 Bft (12.6 km/u)
Lichte wind W 3 Bft (W-N 1-3 Bft)
Temperature:
23.7°C
Aangenaam (20-25°C)
Humidity:
72%
Goed (60-75%)
Cloud cover:
67% (laag 16%, midden 12%, hoog 56%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
23.6 km
Goed zicht (>= 10 km)
UV index:
UV-index 4.2
Normaal (2-5)
Air pressure:
1018.9 hPa
Normaal (1000-1020 hPa)
18:00 - Some risk
Wind:
W 2 Bft (11.4 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
22.7°C
Aangenaam (20-25°C)
Humidity:
74%
Goed (60-75%)
Cloud cover:
82% (laag 23%, midden 8%, hoog 74%)
Voornamelijk hoge bewolking (6-7/8, overwegend hoog)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
20.4 km
Goed zicht (>= 10 km)
UV index:
UV-index 3
Normaal (2-5)
Air pressure:
1019.7 hPa
Normaal (1000-1020 hPa)