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Aberfan 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Aberfan

Rhondda, Cynon, Taff, United Kingdom

Long range weather outlook for Aberfan includes 14 day forecast summary:

Taking a look at Aberfan over the coming two weeks and the average daytime maximum temperature will be around 4°C, with a high for the two weeks of 10°C expected on the afternoon of Thursday 14th. The mean minimum temperature will be 1°C, dipping to its lowest on the morning of Sunday 24th at -5°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain or snow. The indicators are that Monday 18th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 14
Nov
15:00

NE
NE

4 / 6 mph 50 / 49°F 83% 1032 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

3 / 5 mph 46 / 45°F 93% 1032 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

1 / 3 mph 44 / 44°F 94% 1032 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 15
Nov
00:00

NE
NE

2 / 3 mph 43 / 43°F 93% 1032 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

1 / 2 mph 42 / 42°F 91% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

2 / 3 mph 41 / 41°F 90% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

2 / 3 mph 42 / 42°F 87% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

2 / 3 mph 48 / 48°F 76% 1027 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

2 / 4 mph 48 / 48°F 84% 1025 mb
Low level cloud: 24%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

3 / 5 mph 43 / 42°F 92% 1025 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 96%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

3 / 6 mph 42 / 40°F 93% 1024 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 16
Nov
00:00

WNW
WNW

3 / 6 mph 43 / 41°F 90% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

3 / 6 mph 41 / 39°F 91% 1022 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

3 / 7 mph 40 / 38°F 92% 1021 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 36%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

3 / 6 mph 43 / 41°F 93% 1020 mb
Low level cloud: 97%
Mid level cloud: 8%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

3 / 5 mph 46 / 45°F 98% 1019 mb
Low level cloud: 98%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

6 / 10 mph 48 / 45°F 94% 1017 mb
Low level cloud: 85%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

5 / 8 mph 47 / 44°F 95% 1017 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

5 / 8 mph 44 / 41°F 92% 1017 mb
Low level cloud: 19%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 17
Nov
00:00

WNW
WNW

4 / 6 mph 42 / 40°F 88% 1017 mb
Low level cloud: 68%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

4 / 6 mph 40 / 38°F 93% 1016 mb
Low level cloud: 23%
Mid level cloud: 95%
High level cloud: 20%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

5 / 9 mph 39 / 35°F 92% 1015 mb
Low level cloud: 51%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

11 / 17 mph 41 / 35°F 86% 1015 mb
Low level cloud: 82%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

8 / 12 mph 42 / 37°F 91% 1014 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

12 / 18 mph 41 / 34°F 87% 1014 mb
Low level cloud: 82%
Mid level cloud: 50%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

7 / 12 mph 39 / 34°F 89% 1015 mb
Low level cloud: 25%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

4 / 7 mph 38 / 35°F 93% 1016 mb
Low level cloud: 85%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Nov
00:00

W
W

4 / 7 mph 38 / 35°F 92% 1015 mb
Low level cloud: 58%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

3 / 6 mph 37 / 35°F 93% 1015 mb
Low level cloud: 28%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

2 / 3 mph 37 / 37°F 90% 1015 mb
Low level cloud: 17%
Mid level cloud: 44%
High level cloud: 95%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

2 / 3 mph 38 / 38°F 85% 1014 mb
Low level cloud: 15%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

5 / 7 mph 37 / 33°F 96% 1011 mb
Low level cloud: 99%
Mid level cloud: 89%
High level cloud: 69%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

6 / 9 mph 39 / 34°F 99% 1005 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

10 / 17 mph 46 / 41°F 98% 999 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
21:00

W
W

19 / 30 mph 48 / 41°F 93% 996 mb
Low level cloud: 84%
Mid level cloud: 70%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 19
Nov
00:00

NNE
NNE

7 / 10 mph 34 / 28°F 97% 995 mb
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

N
N

17 / 26 mph 29 / 17°F 94% 999 mb
Low level cloud: 56%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

NNW
NNW

16 / 26 mph 31 / 20°F 89% 1003 mb
Low level cloud: 82%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

15 / 24 mph 33 / 22°F 88% 1008 mb
Low level cloud: 28%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

17 / 25 mph 34 / 24°F 78% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

13 / 21 mph 33 / 24°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

9 / 17 mph 31 / 23°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

8 / 15 mph 31 / 24°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Nov
00:00

NW
NW

7 / 10 mph 31 / 24°F 92% 1018 mb
Low level cloud: 28%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

11 / 19 mph 29 / 20°F 90% 1017 mb
Low level cloud: 72%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

7 / 13 mph 28 / 21°F 97% 1017 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

4 / 5 mph 31 / 26°F 96% 1017 mb
Low level cloud: 60%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WNW
WNW

6 / 9 mph 33 / 27°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

11 / 15 mph 35 / 26°F 84% 1017 mb
Low level cloud: 26%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

14 / 19 mph 33 / 23°F 86% 1017 mb
Low level cloud: 60%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

17 / 32 mph 31 / 20°F 82% 1017 mb
Low level cloud: 17%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 21
Nov
00:00

NE
NE

4 / 7 mph 33 / 30°F 94% 997 mb
Low level cloud: 67%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

4 / 6 mph 33 / 29°F 78% 1005 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
12:00

N
N

10 / 19 mph 30 / 21°F 92% 999 mb
Low level cloud: 60%
Mid level cloud: 14%
High level cloud: 6%
Most Significant Cloud Type: low
65%
0.0 In
18:00

NW
NW

20 / 32 mph 41 / 32°F 94% 995 mb
Low level cloud: 95%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
99%
0.0 In
Fri 22
Nov
00:00

NW
NW

11 / 18 mph 37 / 30°F 82% 1005 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

WNW
WNW

4 / 8 mph 28 / 24°F 95% 1014 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 95%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

W
W

6 / 10 mph 37 / 33°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

WNW
WNW

3 / 6 mph 33 / 29°F 88% 1018 mb
Low level cloud: 3%
Mid level cloud: 16%
High level cloud: 22%
Most Significant Cloud Type: medium
24%
0.0 In
Sat 23
Nov
00:00

NNW
NNW

4 / 7 mph 33 / 29°F 90% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: medium
8%
0.0 In
06:00

NNW
NNW

2 / 3 mph 33 / 33°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

ESE
ESE

2 / 3 mph 36 / 36°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

ENE
ENE

14 / 24 mph 29 / 19°F 96% 1010 mb
Low level cloud: 64%
Mid level cloud: 98%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.1 In
Sun 24
Nov
00:00

NW
NW

1 / 2 mph 34 / 34°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

NNE
NNE

8 / 16 mph 25 / 16°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
0.1 In
12:00

ESE
ESE

3 / 4 mph 35 / 33°F 87% 1023 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
18:00

N
N

8 / 16 mph 28 / 20°F 86% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 46%
Most Significant Cloud Type: medium
10%
0.0 In
Mon 25
Nov
00:00

ESE
ESE

23 / 39 mph 31 / 18°F 99% 1017 mb
Low level cloud: 89%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
06:00

NNW
NNW

7 / 15 mph 27 / 19°F 86% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SW
SW

12 / 24 mph 44 / 38°F 100% 1001 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 22%
Most Significant Cloud Type: low
100%
1.3 In
18:00

NW
NW

5 / 11 mph 30 / 25°F 92% 1019 mb
Low level cloud: 15%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Tue 26
Nov
00:00

W
W

9 / 15 mph 49 / 46°F 98% 1007 mb
Low level cloud: 99%
Mid level cloud: 14%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

5 / 8 mph 31 / 26°F 96% 1015 mb
Low level cloud: 9%
Mid level cloud: 11%
High level cloud: 20%
Most Significant Cloud Type: low
14%
0.1 In
12:00

ENE
ENE

5 / 8 mph 40 / 37°F 99% 1014 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.7 In
18:00

NW
NW

5 / 9 mph 30 / 25°F 92% 1018 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
Wed 27
Nov
00:00

SSW
SSW

4 / 6 mph 52 / 51°F 99% 1011 mb
Low level cloud: 50%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
83%
0.0 In
06:00

NNW
NNW

7 / 15 mph 25 / 17°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

SSW
SSW

11 / 19 mph 58 / 56°F 87% 1005 mb
Low level cloud: 3%
Mid level cloud: 32%
High level cloud: 22%
Most Significant Cloud Type: medium
42%
0.0 In
18:00

N
N

7 / 13 mph 33 / 27°F 89% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 28
Nov
00:00

WSW
WSW

22 / 38 mph 50 / 43°F 90% 1006 mb
Low level cloud: 100%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

6 / 13 mph 25 / 18°F 92% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SW
SW

16 / 27 mph 50 / 45°F 91% 1013 mb
Low level cloud: 94%
Mid level cloud: 7%
High level cloud: 83%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

6 / 11 mph 32 / 26°F 95% 1030 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
30%
0.0 In
Fri 29
Nov
00:00

S
S

12 / 22 mph 48 / 43°F 96% 1010 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 37%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

13 / 24 mph 30 / 20°F 92% 1026 mb
Low level cloud: 34%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SW
SW

17 / 30 mph 50 / 44°F 91% 1010 mb
Low level cloud: 97%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.1 In
18:00

E
E

19 / 34 mph 34 / 23°F 89% 1021 mb
Low level cloud: 1%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: medium
63%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure