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Clase 14 Day Long Range Forecast

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

Abertawe, United Kingdom

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

Taking a look at Clase over the coming two weeks and the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 20°C expected on the afternoon of Saturday 12th. The mean minimum temperature will be 7°C, dipping to its lowest on the morning of Tuesday 15th at 5°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 15th will have the most precipitation with an accumulation of around 25.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 08
Apr
15:00

SSW
SSW

5 / 7 mph 56 / 54°F 63% 1026 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

1 / 2 mph 55 / 53°F 76% 1026 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 34%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

4 / 8 mph 49 / 47°F 81% 1028 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 09
Apr
00:00

NE
NE

6 / 12 mph 46 / 43°F 83% 1028 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
03:00

NE
NE

7 / 13 mph 45 / 41°F 81% 1028 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

NE
NE

7 / 13 mph 43 / 39°F 83% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

7 / 9 mph 50 / 47°F 65% 1030 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

6 / 9 mph 55 / 52°F 54% 1030 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
15:00

E
E

8 / 13 mph 56 / 53°F 57% 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
18:00

ENE
ENE

6 / 9 mph 56 / 54°F 69% 1031 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
21:00

NE
NE

6 / 10 mph 52 / 49°F 78% 1033 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
Thu 10
Apr
00:00

NE
NE

6 / 13 mph 46 / 43°F 80% 1034 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
03:00

NE
NE

5 / 11 mph 43 / 40°F 81% 1033 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

NE
NE

4 / 10 mph 42 / 39°F 80% 1034 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
09:00

ESE
ESE

3 / 3 mph 54 / 53°F 65% 1033 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
12:00

S
S

4 / 4 mph 58 / 58°F 62% 1032 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
15:00

WSW
WSW

4 / 4 mph 59 / 59°F 65% 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
18:00

W
W

4 / 5 mph 59 / 58°F 78% 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
21:00

N
N

3 / 4 mph 54 / 54°F 85% 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
Fri 11
Apr
00:00

NNE
NNE

4 / 8 mph 46 / 45°F 85% 1028 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
03:00

NNE
NNE

4 / 8 mph 44 / 42°F 84% 1027 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

NNE
NNE

3 / 6 mph 43 / 42°F 81% 1026 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
09:00

S
S

0 / 0 mph 58 / 57°F 70% 1026 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
12:00

SSW
SSW

2 / 2 mph 64 / 63°F 63% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

3 / 4 mph 64 / 63°F 66% 1022 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
18:00

SSE
SSE

2 / 2 mph 64 / 63°F 79% 1020 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
21:00

ENE
ENE

4 / 6 mph 57 / 57°F 83% 1020 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
Sat 12
Apr
00:00

ENE
ENE

4 / 9 mph 49 / 48°F 86% 1019 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
03:00

E
E

6 / 12 mph 47 / 44°F 89% 1016 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

E
E

6 / 14 mph 45 / 41°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

9 / 10 mph 61 / 60°F 74% 1014 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
12:00

ESE
ESE

11 / 13 mph 66 / 65°F 61% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

9 / 10 mph 67 / 66°F 64% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 34%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

7 / 10 mph 60 / 59°F 79% 1006 mb
Low level cloud: 0%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 7 mph 50 / 49°F 94% 1005 mb
Low level cloud: 57%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 13
Apr
00:00

NNE
NNE

6 / 8 mph 52 / 50°F 96% 1003 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNE
NNE

5 / 7 mph 51 / 49°F 93% 1001 mb
Low level cloud: 90%
Mid level cloud: 43%
High level cloud: 26%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 5 mph 50 / 50°F 93% 1000 mb
Low level cloud: 90%
Mid level cloud: 50%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

4 / 5 mph 54 / 53°F 87% 1000 mb
Low level cloud: 62%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

4 / 5 mph 57 / 56°F 80% 1000 mb
Low level cloud: 81%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

6 / 8 mph 58 / 56°F 78% 1000 mb
Low level cloud: 69%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

12 / 15 mph 55 / 51°F 84% 1001 mb
Low level cloud: 33%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

7 / 12 mph 46 / 42°F 90% 1002 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 14
Apr
00:00

WNW
WNW

6 / 10 mph 45 / 42°F 88% 1003 mb
Low level cloud: 31%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

3 / 4 mph 45 / 44°F 92% 1004 mb
Low level cloud: 78%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

4 / 6 mph 47 / 45°F 93% 1004 mb
Low level cloud: 81%
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
09:00

W
W

7 / 9 mph 50 / 47°F 77% 1005 mb
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 18%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

8 / 10 mph 52 / 49°F 68% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 44%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

7 / 10 mph 53 / 49°F 66% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 16%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

3 / 4 mph 53 / 52°F 76% 1007 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

1 / 2 mph 48 / 48°F 83% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 15
Apr
00:00

ENE
ENE

5 / 9 mph 42 / 39°F 82% 1005 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

S
S

5 / 7 mph 44 / 41°F 89% 1003 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: low
43%
0.0 In
12:00

NE
NE

5 / 7 mph 51 / 50°F 91% 1004 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

4 / 4 mph 53 / 53°F 93% 1002 mb
Low level cloud: 99%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Wed 16
Apr
00:00

ESE
ESE

9 / 18 mph 41 / 35°F 81% 1004 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
06:00

NNW
NNW

13 / 23 mph 43 / 36°F 87% 1002 mb
Low level cloud: 15%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NNW
NNW

12 / 20 mph 51 / 47°F 65% 1007 mb
Low level cloud: 14%
Mid level cloud: 12%
High level cloud: 16%
Most Significant Cloud Type: low
20%
0.0 In
18:00

WNW
WNW

6 / 9 mph 52 / 50°F 95% 997 mb
Low level cloud: 84%
Mid level cloud: 83%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
Thu 17
Apr
00:00

NNW
NNW

13 / 21 mph 47 / 41°F 76% 1008 mb
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: medium
69%
0.0 In
06:00

WNW
WNW

12 / 17 mph 48 / 43°F 95% 1000 mb
Low level cloud: 91%
Mid level cloud: 68%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.6 In
12:00

N
N

17 / 28 mph 57 / 54°F 64% 1005 mb
Low level cloud: 18%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
38%
0.2 In
18:00

WNW
WNW

14 / 21 mph 51 / 46°F 83% 1009 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: low
7%
0.0 In
Fri 18
Apr
00:00

NNW
NNW

8 / 14 mph 48 / 44°F 86% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

6 / 9 mph 49 / 46°F 95% 1014 mb
Low level cloud: 93%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

NW
NW

16 / 26 mph 51 / 46°F 60% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
18:00

NE
NE

4 / 5 mph 57 / 58°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 92%
Most Significant Cloud Type: medium
20%
0.0 In
Sat 19
Apr
00:00

NW
NW

11 / 21 mph 46 / 41°F 90% 1014 mb
Low level cloud: 52%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
06:00

ENE
ENE

8 / 12 mph 42 / 37°F 87% 1021 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
12:00

NW
NW

13 / 23 mph 50 / 46°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 48%
Most Significant Cloud Type: high
47%
0.0 In
18:00

ENE
ENE

7 / 12 mph 53 / 50°F 71% 1022 mb
Low level cloud: 82%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
Sun 20
Apr
00:00

NNW
NNW

8 / 13 mph 45 / 41°F 77% 1020 mb
Low level cloud: 77%
Mid level cloud: 26%
High level cloud: 33%
Most Significant Cloud Type: low
90%
0.0 In
06:00

NE
NE

6 / 8 mph 43 / 40°F 84% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NNW
NNW

16 / 28 mph 47 / 40°F 56% 1020 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
15%
0.0 In
18:00

WSW
WSW

4 / 6 mph 56 / 56°F 73% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 21
Apr
00:00

N
N

8 / 14 mph 38 / 32°F 71% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

E
E

4 / 6 mph 47 / 45°F 81% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

10 / 17 mph 50 / 46°F 56% 1025 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
18:00

SSE
SSE

3 / 4 mph 62 / 62°F 74% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 22
Apr
00:00

N
N

6 / 10 mph 41 / 37°F 84% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

E
E

7 / 12 mph 45 / 41°F 84% 1023 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

6 / 9 mph 53 / 51°F 59% 1025 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
18:00

SE
SE

8 / 12 mph 58 / 57°F 79% 1017 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
Wed 23
Apr
00:00

WNW
WNW

3 / 4 mph 50 / 50°F 70% 1025 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 75%
Most Significant Cloud Type: medium
53%
0.0 In
06:00

NE
NE

5 / 9 mph 48 / 46°F 89% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: medium
44%
0.0 In
12:00

WSW
WSW

7 / 12 mph 54 / 52°F 78% 1024 mb
Low level cloud: 36%
Mid level cloud: 82%
High level cloud: 35%
Most Significant Cloud Type: low
68%
0.0 In
18:00

NNE
NNE

6 / 9 mph 54 / 53°F 89% 1012 mb
Low level cloud: 73%
Mid level cloud: 62%
High level cloud: 7%
Most Significant Cloud Type: low
95%
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