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Blackweir 14 Day Long Range Forecast

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

Glamorgan, United Kingdom

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

Over the next 14 days the Blackweir forecast suggests the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 11°C expected on the morning of Monday 15th. The mean minimum temperature will be 5°C, dipping to its lowest on the morning of Thursday 25th at 2°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain, sleet or snow. Predictions are Monday 15th will have the most precipitation with an accumulation of around 38.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the afternoon of Saturday 20th, coming from a southerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 15
Dec		18:00

S
S

 7 / 9 mph 51 / 48°F 96% 1001 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 4 / 5 mph 50 / 49°F 94% 1002 mb
Low level cloud: 99%
Mid level cloud: 63%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 16
Dec		00:00

SSW
SSW

 4 / 6 mph 49 / 48°F 94% 1004 mb
Low level cloud: 67%
Mid level cloud: 100%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 13 mph 48 / 44°F 92% 1005 mb
Low level cloud: 65%
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
06:00

NNE
NNE

 7 / 11 mph 47 / 44°F 90% 1007 mb
Low level cloud: 18%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 4 / 8 mph 46 / 43°F 87% 1011 mb
Low level cloud: 0%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 4 / 5 mph 49 / 47°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 95%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 3 / 4 mph 48 / 47°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 37%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 5 / 8 mph 44 / 42°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 4 / 8 mph 42 / 40°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		00:00

W
W

 3 / 6 mph 41 / 39°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 4 / 9 mph 40 / 37°F 84% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 8 / 15 mph 40 / 35°F 83% 1017 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 12 / 20 mph 44 / 37°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 63%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 17 / 25 mph 48 / 41°F 84% 1014 mb
Low level cloud: 68%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 19 / 29 mph 48 / 42°F 89% 1012 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

 23 / 35 mph 50 / 42°F 90% 1009 mb
Low level cloud: 97%
Mid level cloud: 91%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

 24 / 36 mph 50 / 43°F 92% 1008 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Thu 18
Dec		00:00

SSW
SSW

 19 / 29 mph 51 / 45°F 94% 1007 mb
Low level cloud: 99%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

WSW
WSW

 8 / 13 mph 50 / 47°F 97% 1006 mb
Low level cloud: 88%
Mid level cloud: 28%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SW
SW

 4 / 6 mph 49 / 47°F 94% 1006 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 94%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 3 / 6 mph 48 / 47°F 95% 1005 mb
Low level cloud: 57%
Mid level cloud: 100%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 8 / 13 mph 49 / 46°F 92% 1003 mb
Low level cloud: 54%
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
15:00

S
S

 12 / 18 mph 49 / 44°F 93% 1001 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

 12 / 17 mph 49 / 44°F 93% 1000 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

W
W

 15 / 21 mph 48 / 42°F 87% 1003 mb
Low level cloud: 56%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		00:00

W
W

 8 / 11 mph 45 / 41°F 82% 1007 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 12 / 21 mph 43 / 37°F 79% 1010 mb
Low level cloud: 5%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 13 / 26 mph 42 / 35°F 81% 1013 mb
Low level cloud: 3%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 21 mph 45 / 39°F 83% 1016 mb
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 15 / 20 mph 48 / 42°F 80% 1017 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 14 / 16 mph 50 / 45°F 81% 1017 mb
Low level cloud: 36%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 11 / 13 mph 49 / 44°F 86% 1018 mb
Low level cloud: 11%
Mid level cloud: 15%
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

SW
SW

 12 / 15 mph 46 / 41°F 89% 1018 mb
Low level cloud: 18%
Mid level cloud: 19%
High level cloud: 13%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		00:00

SSW
SSW

 11 / 17 mph 44 / 39°F 89% 1017 mb
Low level cloud: 9%
Mid level cloud: 28%
High level cloud: 92%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 13 / 25 mph 43 / 36°F 90% 1015 mb
Low level cloud: 20%
Mid level cloud: 46%
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

SSW
SSW

 16 / 34 mph 42 / 34°F 86% 1012 mb
Low level cloud: 46%
Mid level cloud: 78%
High level cloud: 33%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 19 / 39 mph 45 / 37°F 84% 1009 mb
Low level cloud: 94%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 23 / 37 mph 47 / 40°F 90% 1006 mb
Low level cloud: 98%
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
15:00

S
S

 26 / 36 mph 49 / 41°F 91% 1002 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 9 / 11 mph 48 / 43°F 93% 1002 mb
Low level cloud: 94%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
21:00

SW
SW

 6 / 6 mph 46 / 43°F 89% 1003 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
37%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 21
Dec		00:00

SSW
SSW

 7 / 10 mph 43 / 39°F 89% 1002 mb
Low level cloud: 75%
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

SW
SW

 7 / 13 mph 42 / 37°F 88% 1001 mb
Low level cloud: 46%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 9 / 17 mph 41 / 35°F 87% 1000 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 11 / 16 mph 43 / 37°F 85% 999 mb
Low level cloud: 10%
Mid level cloud: 100%
High level cloud: 41%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 15 / 23 mph 46 / 40°F 79% 999 mb
Low level cloud: 87%
Mid level cloud: 96%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 18 / 25 mph 47 / 41°F 80% 999 mb
Low level cloud: 79%
Mid level cloud: 62%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 17 / 21 mph 46 / 39°F 81% 1001 mb
Low level cloud: 98%
Mid level cloud: 42%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 16 / 22 mph 44 / 37°F 85% 1004 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 22
Dec		00:00

W
W

 7 / 12 mph 44 / 40°F 89% 1019 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
06:00

N
N

 5 / 9 mph 41 / 38°F 86% 1029 mb
Low level cloud: 66%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
12:00

ESE
ESE

 16 / 27 mph 47 / 41°F 89% 1006 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 5 / 8 mph 47 / 45°F 91% 1012 mb
Low level cloud: 36%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
79%
0.0 In
Tue 23
Dec		00:00

ENE
ENE

 10 / 17 mph 43 / 37°F 91% 1013 mb
Low level cloud: 30%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: low
34%
0.0 In
06:00

NE
NE

 21 / 38 mph 40 / 31°F 84% 1017 mb
Low level cloud: 77%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
80%
0.0 In
12:00

NE
NE

 5 / 8 mph 47 / 45°F 87% 1019 mb
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 97%
Most Significant Cloud Type: medium
39%
0.0 In
18:00

N
N

 6 / 9 mph 52 / 51°F 83% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 24
Dec		00:00

NE
NE

 19 / 36 mph 41 / 32°F 81% 1023 mb
Low level cloud: 92%
Mid level cloud: 9%
High level cloud: 20%
Most Significant Cloud Type: low
98%
0.0 In
06:00

ENE
ENE

 7 / 11 mph 39 / 34°F 90% 1034 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: low
15%
0.0 In
12:00

NE
NE

 17 / 30 mph 44 / 37°F 69% 1027 mb
Low level cloud: 89%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
18:00

ENE
ENE

 5 / 7 mph 49 / 47°F 88% 1032 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
7%
0.0 In
Thu 25
Dec		00:00

NE
NE

 23 / 40 mph 38 / 28°F 81% 1023 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

 6 / 10 mph 38 / 33°F 88% 1026 mb
Low level cloud: 4%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
12:00

NE
NE

 19 / 33 mph 41 / 32°F 97% 1018 mb
Low level cloud: 91%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NE
NE

 14 / 22 mph 40 / 32°F 74% 1028 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
87%
0.0 In
Fri 26
Dec		00:00

ENE
ENE

 15 / 26 mph 39 / 31°F 96% 1019 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNE
NNE

 9 / 16 mph 35 / 28°F 88% 1033 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 72%
Most Significant Cloud Type: medium
51%
0.0 In
12:00

NE
NE

 9 / 16 mph 41 / 36°F 98% 1019 mb
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNE
NNE

 12 / 19 mph 41 / 34°F 84% 1036 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
0.0 In
Sat 27
Dec		00:00

NE
NE

 11 / 21 mph 40 / 33°F 88% 1018 mb
Low level cloud: 67%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: low
70%
0.0 In
06:00

NNE
NNE

 10 / 21 mph 36 / 29°F 73% 1035 mb
Low level cloud: 18%
Mid level cloud: 1%
High level cloud: 22%
Most Significant Cloud Type: low
21%
0.0 In
12:00

E
E

 12 / 23 mph 42 / 35°F 94% 1015 mb
Low level cloud: 97%
Mid level cloud: 57%
High level cloud: 54%
Most Significant Cloud Type: low
100%
0.2 In
18:00

N
N

 6 / 10 mph 47 / 43°F 84% 1034 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 28
Dec		00:00

E
E

 11 / 20 mph 41 / 35°F 92% 1012 mb
Low level cloud: 68%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.4 In
06:00

NNE
NNE

 7 / 12 mph 37 / 32°F 85% 1035 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: low
7%
0.0 In
12:00

E
E

 16 / 31 mph 44 / 36°F 89% 1011 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

N
N

 3 / 5 mph 49 / 48°F 84% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 29
Dec		00:00

NE
NE

 13 / 25 mph 44 / 37°F 95% 1010 mb
Low level cloud: 100%
Mid level cloud: 58%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.4 In
06:00

NW
NW

 1 / 1 mph 41 / 41°F 81% 1034 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 18%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

E
E

 6 / 12 mph 49 / 46°F 82% 1018 mb
Low level cloud: 21%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
18:00

SW
SW

 8 / 12 mph 43 / 38°F 88% 1028 mb
Low level cloud: 83%
Mid level cloud: 12%
High level cloud: 17%
Most Significant Cloud Type: low
89%
0.0 In
Tue 30
Dec		00:00

NNE
NNE

 7 / 14 mph 46 / 42°F 89% 1025 mb
Low level cloud: 82%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
06:00

SW
SW

 26 / 55 mph 40 / 29°F 85% 1014 mb
Low level cloud: 88%
Mid level cloud: 64%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

 5 / 11 mph 47 / 44°F 85% 1029 mb
Low level cloud: 94%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
18:00

W
W

 19 / 32 mph 45 / 37°F 73% 1003 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.2 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