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Abertawe (Swansea) 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Abertawe (Swansea)

Abertawe, United Kingdom

Long range weather outlook for Abertawe (Swansea) includes 14 day forecast summary:

For Abertawe (Swansea) in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the evening of Friday 24th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 21st at 7°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 22nd will have the most precipitation with an accumulation of around 20.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
May		18:00

ESE
ESE

 13 / 17 mph 59 / 56°F 82% 1004 mb
Low level cloud: 9%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 8 / 12 mph 58 / 55°F 90% 1005 mb
Low level cloud: 15%
Mid level cloud: 17%
High level cloud: 16%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

E
E

 10 / 19 mph 51 / 47°F 91% 1005 mb
Low level cloud: 18%
Mid level cloud: 17%
High level cloud: 9%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 9 / 17 mph 50 / 46°F 90% 1005 mb
Low level cloud: 19%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 7 / 13 mph 52 / 48°F 89% 1006 mb
Low level cloud: 26%
Mid level cloud: 18%
High level cloud: 35%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 9 / 10 mph 61 / 59°F 81% 1006 mb
Low level cloud: 51%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 7 / 9 mph 64 / 61°F 79% 1006 mb
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 5 / 8 mph 60 / 60°F 84% 1006 mb
Low level cloud: 6%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

N
N

 5 / 8 mph 59 / 57°F 88% 1006 mb
Low level cloud: 36%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
69%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

 6 / 9 mph 55 / 52°F 89% 1007 mb
Low level cloud: 6%
Mid level cloud: 60%
High level cloud: 42%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

NW
NW

 4 / 6 mph 54 / 53°F 93% 1007 mb
Low level cloud: 28%
Mid level cloud: 51%
High level cloud: 33%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 4 / 6 mph 53 / 53°F 95% 1007 mb
Low level cloud: 65%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 2 / 2 mph 53 / 53°F 94% 1008 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 69%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 6 mph 56 / 54°F 89% 1009 mb
Low level cloud: 49%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 5 / 6 mph 59 / 57°F 85% 1010 mb
Low level cloud: 11%
Mid level cloud: 12%
High level cloud: 47%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 5 / 7 mph 60 / 58°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 5 / 8 mph 60 / 58°F 81% 1011 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 4 / 5 mph 58 / 57°F 91% 1013 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 71%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

N
N

 2 / 4 mph 54 / 55°F 92% 1013 mb
Low level cloud: 11%
Mid level cloud: 11%
High level cloud: 44%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 3 / 6 mph 52 / 52°F 91% 1014 mb
Low level cloud: 10%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 4 / 6 mph 55 / 53°F 90% 1014 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 82%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 2 / 3 mph 60 / 60°F 81% 1015 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 4 / 5 mph 64 / 62°F 73% 1015 mb
Low level cloud: 17%
Mid level cloud: 8%
High level cloud: 21%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 5 / 7 mph 64 / 62°F 80% 1015 mb
Low level cloud: 19%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 9 / 15 mph 62 / 60°F 89% 1015 mb
Low level cloud: 9%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 14 mph 57 / 54°F 93% 1016 mb
Low level cloud: 8%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 6 / 14 mph 53 / 51°F 93% 1016 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 6 / 13 mph 51 / 48°F 92% 1016 mb
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 12 mph 54 / 50°F 91% 1017 mb
Low level cloud: 67%
Mid level cloud: 14%
High level cloud: 6%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 8 / 9 mph 63 / 61°F 77% 1017 mb
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 3 / 3 mph 62 / 62°F 75% 1017 mb
Low level cloud: 98%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 2 / 3 mph 64 / 63°F 78% 1017 mb
Low level cloud: 68%
Mid level cloud: 28%
High level cloud: 5%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 2 / 2 mph 65 / 63°F 81% 1017 mb
Low level cloud: 15%
Mid level cloud: 11%
High level cloud: 67%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 6 / 11 mph 57 / 54°F 86% 1019 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 55%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

ENE
ENE

 9 / 15 mph 51 / 48°F 87% 1019 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 42%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 8 / 14 mph 49 / 46°F 87% 1019 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 34%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 7 / 10 mph 49 / 46°F 86% 1019 mb
Low level cloud: 7%
Mid level cloud: 21%
High level cloud: 86%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 10 / 12 mph 53 / 49°F 80% 1020 mb
Low level cloud: 62%
Mid level cloud: 36%
High level cloud: 16%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 7 / 8 mph 62 / 60°F 72% 1019 mb
Low level cloud: 70%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 2 / 2 mph 62 / 60°F 74% 1018 mb
Low level cloud: 78%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 1 / 1 mph 61 / 60°F 76% 1017 mb
Low level cloud: 91%
Mid level cloud: 16%
High level cloud: 6%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 4 / 6 mph 58 / 57°F 79% 1017 mb
Low level cloud: 27%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

ENE
ENE

 6 / 9 mph 54 / 53°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 8 / 16 mph 47 / 43°F 87% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 8 / 14 mph 49 / 44°F 84% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 9 / 10 mph 58 / 56°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 75%
High level cloud: 32%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 8 / 10 mph 65 / 62°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 32%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 6 / 7 mph 66 / 63°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 4 / 4 mph 66 / 63°F 73% 1013 mb
Low level cloud: 3%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 7 / 15 mph 53 / 49°F 83% 1013 mb
Low level cloud: 16%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May		00:00

WSW
WSW

 7 / 15 mph 55 / 53°F 94% 1010 mb
Low level cloud: 57%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
78%
0.0 In
06:00

ESE
ESE

 6 / 13 mph 54 / 52°F 92% 1012 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 65%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

 5 / 11 mph 60 / 60°F 84% 1012 mb
Low level cloud: 88%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 8 / 17 mph 60 / 60°F 86% 1013 mb
Low level cloud: 42%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: low
49%
0.0 In
Thu 23
May		00:00

NE
NE

 4 / 8 mph 57 / 57°F 88% 1014 mb
Low level cloud: 35%
Mid level cloud: 33%
High level cloud: 15%
Most Significant Cloud Type: low
47%
0.0 In
06:00

S
S

 9 / 18 mph 53 / 50°F 90% 1020 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 76%
Most Significant Cloud Type: low
23%
0.0 In
12:00

N
N

 9 / 18 mph 60 / 60°F 70% 1022 mb
Low level cloud: 97%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 9 / 19 mph 62 / 62°F 89% 1017 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
84%
0.0 In
Fri 24
May		00:00

NNE
NNE

 8 / 17 mph 54 / 52°F 86% 1021 mb
Low level cloud: 73%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.2 In
06:00

NE
NE

 6 / 13 mph 54 / 53°F 87% 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

E
E

 12 / 25 mph 58 / 56°F 91% 1021 mb
Low level cloud: 97%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

 4 / 7 mph 67 / 67°F 75% 1018 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
Sat 25
May		00:00

ESE
ESE

 8 / 17 mph 53 / 50°F 91% 1020 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

ENE
ENE

 3 / 6 mph 60 / 60°F 90% 1019 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
8%
0.0 In
12:00

SSW
SSW

 6 / 12 mph 58 / 57°F 87% 1019 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 8 / 16 mph 65 / 65°F 84% 1018 mb
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
9%
0.0 In
Sun 26
May		00:00

NE
NE

 2 / 5 mph 56 / 57°F 89% 1019 mb
Low level cloud: 44%
Mid level cloud: 42%
High level cloud: 98%
Most Significant Cloud Type: low
70%
0.0 In
06:00

NNW
NNW

 5 / 10 mph 57 / 57°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

SSW
SSW

 1 / 2 mph 65 / 65°F 78% 1018 mb
Low level cloud: 54%
Mid level cloud: 27%
High level cloud: 21%
Most Significant Cloud Type: low
65%
0.0 In
18:00

NNW
NNW

 13 / 28 mph 57 / 54°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 27
May		00:00

ENE
ENE

 15 / 31 mph 59 / 56°F 91% 1017 mb
Low level cloud: 13%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: low
17%
0.2 In
06:00

NNW
NNW

 6 / 13 mph 53 / 51°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
12:00

ENE
ENE

 15 / 31 mph 62 / 62°F 66% 1018 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
18:00

NW
NW

 10 / 20 mph 57 / 55°F 75% 1021 mb
Low level cloud: 14%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Tue 28
May		00:00

NNW
NNW

 9 / 18 mph 50 / 46°F 87% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNW
NNW

 14 / 30 mph 49 / 44°F 83% 1022 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

NNE
NNE

 12 / 25 mph 56 / 53°F 78% 1007 mb
Low level cloud: 2%
Mid level cloud: 74%
High level cloud: 34%
Most Significant Cloud Type: medium
81%
0.0 In
18:00

NW
NW

 10 / 22 mph 56 / 53°F 72% 1023 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 22%
Most Significant Cloud Type: medium
52%
0.0 In
Wed 29
May		00:00

ENE
ENE

 8 / 16 mph 55 / 53°F 90% 1006 mb
Low level cloud: 72%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
89%
0.0 In
06:00

WNW
WNW

 8 / 17 mph 51 / 48°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

SSE
SSE

 1 / 3 mph 60 / 60°F 96% 1006 mb
Low level cloud: 96%
Mid level cloud: 83%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.2 In
18:00

W
W

 14 / 30 mph 58 / 55°F 81% 1018 mb
Low level cloud: 8%
Mid level cloud: 33%
High level cloud: 21%
Most Significant Cloud Type: medium
55%
0.0 In
Thu 30
May		00:00

ESE
ESE

 4 / 9 mph 62 / 62°F 91% 1007 mb
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 14%
Most Significant Cloud Type: low
22%
0.0 In
06:00

W
W

 9 / 18 mph 54 / 52°F 95% 1015 mb
Low level cloud: 98%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 4 / 9 mph 62 / 62°F 75% 1007 mb
Low level cloud: 4%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
42%
0.0 In
18:00

WSW
WSW

 11 / 24 mph 58 / 56°F 85% 1015 mb
Low level cloud: 20%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: low
24%
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