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).
Maidstone (0 km)
Some risk
Wind: NNO 2 Bft (10.7 km/u)
Cloud cover: 94% (laag 22%, midden 0%, hoog 92%)
07:00 - Some risk
Wind:
NNO 2 Bft (10.7 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
15.6°C
Ideaal (15-20°C)
Humidity:
84%
Vochtig (75-90%)
Cloud cover:
94% (laag 22%, midden 0%, hoog 92%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1016 hPa
Normaal (1000-1020 hPa)
08:00 - Some risk
Wind:
NNO 2 Bft (11.3 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
15.8°C
Ideaal (15-20°C)
Humidity:
78%
Vochtig (75-90%)
Cloud cover:
18% (laag 9%, midden 0%, hoog 10%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1016.3 hPa
Normaal (1000-1020 hPa)
09:00 - Some risk
Wind:
NNO 2 Bft (10.4 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
16.8°C
Ideaal (15-20°C)
Humidity:
72%
Goed (60-75%)
Cloud cover:
36% (laag 36%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1016.5 hPa
Normaal (1000-1020 hPa)
North Hertfordshire (88 km)
Risk
Cloud cover: 100% (laag 100%, midden 0%, hoog 0%)
Wind: N 3 Bft (16.1 km/u)
08:00 - Neutral
Wind:
N 3 Bft (15.5 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
14.3°C
Fris (10-15°C)
Humidity:
76%
Vochtig (75-90%)
Cloud cover:
25% (laag 25%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1002.3 hPa
Normaal (1000-1020 hPa)
09:00 - Risk
Wind:
N 3 Bft (16.4 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
15.1°C
Ideaal (15-20°C)
Humidity:
69%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1002.8 hPa
Normaal (1000-1020 hPa)
10:00 - Risk
Wind:
N 3 Bft (16.1 km/u)
Oostelijke wind N 3 Bft (N-ZO richting)
Temperature:
16°C
Ideaal (15-20°C)
Humidity:
63%
Goed (60-75%)
Cloud cover:
92% (laag 92%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1003 hPa
Normaal (1000-1020 hPa)
South Kesteven (176 km)
Risk
Wind: N 3 Bft (17.2 km/u)
Cloud cover: 95% (laag 95%, midden 0%, hoog 0%)
09:00 - Risk
Wind:
N 3 Bft (17.2 km/u)
Oostelijke wind N 3 Bft (N-ZO richting)
Temperature:
14.4°C
Fris (10-15°C)
Humidity:
69%
Goed (60-75%)
Cloud cover:
95% (laag 95%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1016.9 hPa
Normaal (1000-1020 hPa)
10:00 - Risk
Wind:
N 3 Bft (16.8 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
16°C
Ideaal (15-20°C)
Humidity:
63%
Goed (60-75%)
Cloud cover:
91% (laag 91%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1016.8 hPa
Normaal (1000-1020 hPa)
11:00 - Risk
Wind:
N 3 Bft (16.1 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
17.1°C
Ideaal (15-20°C)
Humidity:
60%
Goed (60-75%)
Cloud cover:
98% (laag 98%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1017 hPa
Normaal (1000-1020 hPa)
North Lincolnshire (264 km)
Risk
Cloud cover: 100% (laag 100%, midden 0%, hoog 0%)
11:00 - Risk
Wind:
NNW 3 Bft (12.9 km/u)
Lichte wind NNW 3 Bft (W-N 1-3 Bft)
Temperature:
16.1°C
Ideaal (15-20°C)
Humidity:
68%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1020.9 hPa
Hogedruk (>= 1020 hPa)
12:00 - Risk
Wind:
NNW 3 Bft (12.7 km/u)
Lichte wind NNW 3 Bft (W-N 1-3 Bft)
Temperature:
17.1°C
Ideaal (15-20°C)
Humidity:
64%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1020.8 hPa
Hogedruk (>= 1020 hPa)
13:00 - Risk
Wind:
NNW 3 Bft (14.1 km/u)
Lichte wind NNW 3 Bft (W-N 1-3 Bft)
Temperature:
17.8°C
Ideaal (15-20°C)
Humidity:
61%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1020.8 hPa
Hogedruk (>= 1020 hPa)
North Yorkshire (352 km)
Risk
Cloud cover: 100% (laag 100%, midden 0%, hoog 0%)
Wind: N 3 Bft (14.9 km/u)
12:00 - Risk
Wind:
N 3 Bft (13.1 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
16.4°C
Ideaal (15-20°C)
Humidity:
65%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Air pressure:
1017.6 hPa
Normaal (1000-1020 hPa)
13:00 - Risk
Wind:
N 3 Bft (12.6 km/u)
Lichte wind N 3 Bft (W-N 1-3 Bft)
Temperature:
16.8°C
Ideaal (15-20°C)
Humidity:
65%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 2%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Air pressure:
1017.8 hPa
Normaal (1000-1020 hPa)
14:00 - Risk
Wind:
N 3 Bft (14.9 km/u)
Oostelijke wind N 3 Bft (N-ZO richting)
Temperature:
17.1°C
Ideaal (15-20°C)
Humidity:
60%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 96%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0.1 mm (Motregen)
Lichte buien (< 1 mm)
Air pressure:
1018.4 hPa
Normaal (1000-1020 hPa)
Prudhoe (439 km)
Risk
Wind: N 3 Bft (13.9 km/u)
Cloud cover: 100% (laag 100%, midden 89%, hoog 0%)
14:00 - Risk
Wind:
N 3 Bft (13.9 km/u)
Oostelijke wind N 3 Bft (N-ZO richting)
Temperature:
15.8°C
Ideaal (15-20°C)
Humidity:
64%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 89%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1004.7 hPa
Normaal (1000-1020 hPa)
15:00 - Risk
Wind:
N 3 Bft (12.1 km/u)
Oostelijke wind N 3 Bft (N-ZO richting)
Temperature:
16.2°C
Ideaal (15-20°C)
Humidity:
62%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 23%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1004.9 hPa
Normaal (1000-1020 hPa)
16:00 - Risk
Wind:
N 2 Bft (11.7 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
16.8°C
Ideaal (15-20°C)
Humidity:
60%
Goed (60-75%)
Cloud cover:
100% (laag 100%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Air pressure:
1004.8 hPa
Normaal (1000-1020 hPa)