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: ZW 2 Bft (6.8 km/u)
UV index: UV-index 0
07:00 - Some risk
Wind:
ZW 2 Bft (6.8 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
14.6°C
Fris (10-15°C)
Humidity:
82%
Vochtig (75-90%)
Cloud cover:
0% (laag 0%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
27.8 km
Goed zicht (>= 10 km)
UV index:
UV-index 0
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1024.3 hPa
Hogedruk (>= 1020 hPa)
08:00 - Some risk
Wind:
W 2 Bft (8.6 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
16.9°C
Ideaal (15-20°C)
Humidity:
73%
Goed (60-75%)
Cloud cover:
0% (laag 0%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
31.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 0.3
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1024.3 hPa
Hogedruk (>= 1020 hPa)
09:00 - Some risk
Wind:
W 2 Bft (10.1 km/u)
Zwakke/variabele wind 2 Bft (0-2 Bft variabel)
Temperature:
18.8°C
Ideaal (15-20°C)
Humidity:
67%
Goed (60-75%)
Cloud cover:
2% (laag 2%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
33.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 0.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1024.2 hPa
Hogedruk (>= 1020 hPa)
North Hertfordshire (88 km)
Some risk
UV index: UV-index 0.3
08:00 - Some risk
Wind:
W 4 Bft (21.2 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
16°C
Ideaal (15-20°C)
Humidity:
79%
Vochtig (75-90%)
Cloud cover:
53% (laag 53%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
43.4 km
Goed zicht (>= 10 km)
UV index:
UV-index 0.3
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1009.1 hPa
Normaal (1000-1020 hPa)
09:00 - Some risk
Wind:
WZW 3 Bft (19.4 km/u)
Rugwind WZW 3 Bft (Z-W 1-6 Bft)
Temperature:
17.5°C
Ideaal (15-20°C)
Humidity:
75%
Vochtig (75-90%)
Cloud cover:
45% (laag 45%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
41.9 km
Goed zicht (>= 10 km)
UV index:
UV-index 0.8
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1008.9 hPa
Normaal (1000-1020 hPa)
10:00 - Some risk
Wind:
W 3 Bft (19.1 km/u)
Rugwind W 3 Bft (Z-W 1-6 Bft)
Temperature:
19.4°C
Ideaal (15-20°C)
Humidity:
70%
Goed (60-75%)
Cloud cover:
44% (laag 35%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
42.5 km
Goed zicht (>= 10 km)
UV index:
UV-index 1.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1008.8 hPa
Normaal (1000-1020 hPa)
South Kesteven (176 km)
Some risk
Wind: W 4 Bft (24.8 km/u)
UV index: UV-index 0.9
Humidity: 55%
09:00 - Some risk
Wind:
W 4 Bft (24.8 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
19.5°C
Ideaal (15-20°C)
Humidity:
67%
Goed (60-75%)
Cloud cover:
0% (laag 0%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
42 km
Goed zicht (>= 10 km)
UV index:
UV-index 0.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1020.9 hPa
Hogedruk (>= 1020 hPa)
10:00 - Some risk
Wind:
W 4 Bft (23.4 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
20.7°C
Aangenaam (20-25°C)
Humidity:
64%
Goed (60-75%)
Cloud cover:
16% (laag 16%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
40.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 1.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1021 hPa
Hogedruk (>= 1020 hPa)
11:00 - Some risk
Wind:
W 4 Bft (22.7 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
22.3°C
Aangenaam (20-25°C)
Humidity:
55%
Zeer droog (< 60%)
Cloud cover:
4% (laag 4%, midden 0%, hoog 0%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
47.6 km
Goed zicht (>= 10 km)
UV index:
UV-index 3.3
Normaal (2-5)
Air pressure:
1020.8 hPa
Hogedruk (>= 1020 hPa)
North Lincolnshire (264 km)
Some risk
Cloud cover: 100% (laag 77%, midden 0%, hoog 100%)
UV index: UV-index 1.9
Wind: W 4 Bft (28.4 km/u)
Humidity: 58%
11:00 - Some risk
Wind:
W 4 Bft (22.7 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
20.2°C
Aangenaam (20-25°C)
Humidity:
67%
Goed (60-75%)
Cloud cover:
100% (laag 77%, midden 0%, hoog 100%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
35.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 1.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1023.6 hPa
Hogedruk (>= 1020 hPa)
12:00 - Neutral
Wind:
W 4 Bft (27.7 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
21.3°C
Aangenaam (20-25°C)
Humidity:
62%
Goed (60-75%)
Cloud cover:
66% (laag 63%, midden 0%, hoog 7%)
Licht bewolkt (0-5/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
37.5 km
Goed zicht (>= 10 km)
UV index:
UV-index 3.4
Normaal (2-5)
Air pressure:
1023.2 hPa
Hogedruk (>= 1020 hPa)
13:00 - Some risk
Wind:
W 4 Bft (28.4 km/u)
Kopwind W 4 Bft (W-N 4-5 Bft)
Temperature:
22°C
Aangenaam (20-25°C)
Humidity:
58%
Zeer droog (< 60%)
Cloud cover:
100% (laag 52%, midden 0%, hoog 100%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
40.5 km
Goed zicht (>= 10 km)
UV index:
UV-index 4.2
Normaal (2-5)
Air pressure:
1023.6 hPa
Hogedruk (>= 1020 hPa)
North Yorkshire (352 km)
Some risk
Cloud cover: 95% (laag 72%, midden 78%, hoog 0%)
12:00 - Some risk
Wind:
WZW 4 Bft (23 km/u)
Rugwind WZW 4 Bft (Z-W 1-6 Bft)
Temperature:
19.5°C
Ideaal (15-20°C)
Humidity:
70%
Goed (60-75%)
Cloud cover:
95% (laag 72%, midden 78%, hoog 0%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
34.1 km
Goed zicht (>= 10 km)
UV index:
UV-index 2.3
Normaal (2-5)
Air pressure:
1018.5 hPa
Normaal (1000-1020 hPa)
13:00 - Some risk
Wind:
W 4 Bft (27 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
20.2°C
Aangenaam (20-25°C)
Humidity:
67%
Goed (60-75%)
Cloud cover:
98% (laag 73%, midden 84%, hoog 0%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
35 km
Goed zicht (>= 10 km)
UV index:
UV-index 2.8
Normaal (2-5)
Air pressure:
1018.7 hPa
Normaal (1000-1020 hPa)
14:00 - Some risk
Wind:
W 4 Bft (28.1 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
20.5°C
Aangenaam (20-25°C)
Humidity:
66%
Goed (60-75%)
Cloud cover:
95% (laag 73%, midden 84%, hoog 0%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
36.3 km
Goed zicht (>= 10 km)
UV index:
UV-index 3.1
Normaal (2-5)
Air pressure:
1018.9 hPa
Normaal (1000-1020 hPa)
Prudhoe (439 km)
Risk
Cloud cover: 100% (laag 69%, midden 1%, hoog 100%)
UV index: UV-index 1.9
14:00 - Some risk
Wind:
W 4 Bft (27.4 km/u)
Rugwind W 4 Bft (Z-W 1-6 Bft)
Temperature:
19.1°C
Ideaal (15-20°C)
Humidity:
72%
Goed (60-75%)
Cloud cover:
100% (laag 69%, midden 1%, hoog 100%)
Geheel bewolkt (8/8)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
31.2 km
Goed zicht (>= 10 km)
UV index:
UV-index 4.2
Normaal (2-5)
Air pressure:
1003 hPa
Normaal (1000-1020 hPa)
15:00 - Risk
Wind:
WZW 4 Bft (27 km/u)
Rugwind WZW 4 Bft (Z-W 1-6 Bft)
Temperature:
18.9°C
Ideaal (15-20°C)
Humidity:
73%
Goed (60-75%)
Cloud cover:
100% (laag 80%, midden 0%, hoog 100%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
31.4 km
Goed zicht (>= 10 km)
UV index:
UV-index 3
Normaal (2-5)
Air pressure:
1003.1 hPa
Normaal (1000-1020 hPa)
16:00 - Risk
Wind:
WZW 4 Bft (24.8 km/u)
Rugwind WZW 4 Bft (Z-W 1-6 Bft)
Temperature:
18.9°C
Ideaal (15-20°C)
Humidity:
72%
Goed (60-75%)
Cloud cover:
96% (laag 96%, midden 0%, hoog 0%)
Lage bewolking gesloten (Lage bewolking >= 80% blokkeert UV)
Precipitation:
0 mm
Droog (Geen neerslag)
Visibility:
31.8 km
Goed zicht (>= 10 km)
UV index:
UV-index 1.9
UV-b zwak (UV < 2 in seizoen)
Air pressure:
1003.2 hPa
Normaal (1000-1020 hPa)