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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:

For Blackweir in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 19°C expected on the afternoon of Sunday 28th. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Monday 22nd at 6°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The current forecast indicates Saturday 20th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the evening of Saturday 20th, coming from a north westerly direction, and reaching around 29mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Sep		18:00

NW
NW

 29 / 42 mph 54 / 47°F 86% 1003 mb
Low level cloud: 12%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 15 / 23 mph 52 / 48°F 86% 1010 mb
Low level cloud: 4%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Sep		00:00

WNW
WNW

 6 / 10 mph 51 / 49°F 89% 1012 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 3 / 5 mph 50 / 50°F 89% 1014 mb
Low level cloud: 51%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 10 / 14 mph 51 / 47°F 83% 1016 mb
Low level cloud: 96%
Mid level cloud: 45%
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

NE
NE

 14 / 19 mph 50 / 45°F 81% 1019 mb
Low level cloud: 94%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 13 / 15 mph 56 / 52°F 58% 1020 mb
Low level cloud: 30%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 14 / 17 mph 58 / 54°F 50% 1021 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 12 / 21 mph 53 / 48°F 61% 1023 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 15 / 27 mph 48 / 42°F 64% 1025 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Sep		00:00

NNE
NNE

 10 / 16 mph 47 / 42°F 74% 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
03:00

NNE
NNE

 9 / 17 mph 45 / 40°F 78% 1028 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 10 / 19 mph 43 / 37°F 81% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 66%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 14 / 16 mph 51 / 46°F 67% 1029 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 12 / 14 mph 56 / 52°F 55% 1030 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 10 / 12 mph 58 / 55°F 49% 1029 mb
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 9 / 14 mph 53 / 50°F 61% 1030 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 21%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 8 / 16 mph 47 / 44°F 66% 1031 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 20%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Sep		00:00

NNE
NNE

 8 / 15 mph 46 / 42°F 74% 1031 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 6 / 12 mph 44 / 41°F 75% 1030 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 11 mph 43 / 40°F 77% 1031 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 5 / 6 mph 52 / 50°F 70% 1031 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 31%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 7 / 8 mph 57 / 55°F 60% 1031 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 5 / 6 mph 60 / 58°F 56% 1030 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 16%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 3 / 5 mph 57 / 56°F 62% 1030 mb
Low level cloud: 69%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 4 / 7 mph 54 / 53°F 71% 1031 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 24
Sep		00:00

NE
NE

 7 / 13 mph 50 / 47°F 78% 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
03:00

NE
NE

 7 / 13 mph 47 / 44°F 84% 1031 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 8 / 15 mph 46 / 41°F 88% 1032 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
09:00

NE
NE

 10 / 11 mph 54 / 50°F 77% 1032 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 10 / 12 mph 60 / 59°F 68% 1031 mb
Low level cloud: 38%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 8 / 10 mph 63 / 62°F 58% 1029 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 7 / 12 mph 59 / 57°F 68% 1029 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
21:00

NE
NE

 9 / 14 mph 55 / 52°F 71% 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
Thu 25
Sep		00:00

NE
NE

 6 / 10 mph 50 / 48°F 74% 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
03:00

NNE
NNE

 8 / 15 mph 47 / 43°F 79% 1029 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

 8 / 17 mph 45 / 41°F 85% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 10 / 11 mph 54 / 51°F 74% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 11 / 13 mph 60 / 60°F 62% 1028 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 7 / 9 mph 63 / 62°F 56% 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
18:00

NE
NE

 6 / 9 mph 63 / 62°F 70% 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
21:00

NE
NE

 8 / 13 mph 55 / 53°F 73% 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
Fri 26
Sep		00:00

ENE
ENE

 7 / 11 mph 51 / 49°F 78% 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
03:00

NE
NE

 8 / 14 mph 48 / 45°F 85% 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

NE
NE

 9 / 16 mph 46 / 42°F 87% 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

ENE
ENE

 9 / 10 mph 54 / 50°F 74% 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
12:00

E
E

 7 / 9 mph 60 / 59°F 62% 1025 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

ENE
ENE

 5 / 6 mph 63 / 62°F 56% 1024 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

NNE
NNE

 5 / 6 mph 63 / 62°F 67% 1023 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

 5 / 8 mph 55 / 54°F 72% 1023 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 27
Sep		00:00

ENE
ENE

 13 / 23 mph 49 / 44°F 74% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

SE
SE

 5 / 9 mph 53 / 51°F 92% 1020 mb
Low level cloud: 58%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
60%
0.0 In
12:00

ESE
ESE

 19 / 33 mph 60 / 60°F 65% 1012 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.0 In
18:00

NE
NE

 12 / 20 mph 63 / 63°F 71% 1019 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
73%
0.0 In
Sun 28
Sep		00:00

ENE
ENE

 7 / 12 mph 53 / 51°F 76% 1022 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NNE
NNE

 11 / 17 mph 52 / 49°F 90% 1018 mb
Low level cloud: 45%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
12:00

S
S

 13 / 23 mph 56 / 53°F 87% 1009 mb
Low level cloud: 77%
Mid level cloud: 92%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 13 / 20 mph 65 / 65°F 59% 1013 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
Mon 29
Sep		00:00

NE
NE

 11 / 19 mph 54 / 50°F 81% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NE
NE

 11 / 18 mph 50 / 46°F 83% 1009 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 2%
Most Significant Cloud Type: medium
24%
0.0 In
12:00

ENE
ENE

 15 / 26 mph 64 / 64°F 60% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

E
E

 6 / 10 mph 59 / 58°F 93% 1009 mb
Low level cloud: 77%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Tue 30
Sep		00:00

NE
NE

 11 / 23 mph 52 / 49°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

WSW
WSW

 2 / 4 mph 54 / 55°F 90% 1012 mb
Low level cloud: 23%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: low
29%
0.0 In
12:00

ENE
ENE

 13 / 22 mph 66 / 66°F 62% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ESE
ESE

 4 / 7 mph 63 / 63°F 78% 1014 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
Wed 01
Oct		00:00

ENE
ENE

 6 / 11 mph 57 / 56°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

SSE
SSE

 6 / 11 mph 57 / 56°F 95% 1015 mb
Low level cloud: 57%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
12:00

E
E

 5 / 8 mph 67 / 67°F 66% 1027 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

SSE
SSE

 7 / 13 mph 60 / 60°F 94% 1018 mb
Low level cloud: 94%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: low
95%
0.0 In
Thu 02
Oct		00:00

NW
NW

 2 / 4 mph 62 / 62°F 78% 1030 mb
Low level cloud: 53%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
06:00

E
E

 5 / 9 mph 57 / 56°F 93% 1021 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
37%
0.0 In
12:00

ENE
ENE

 8 / 15 mph 64 / 64°F 67% 1032 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

SSE
SSE

 11 / 22 mph 61 / 61°F 89% 1020 mb
Low level cloud: 13%
Mid level cloud: 31%
High level cloud: 7%
Most Significant Cloud Type: low
24%
0.0 In
Fri 03
Oct		00:00

NE
NE

 6 / 10 mph 60 / 60°F 78% 1032 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 61%
Most Significant Cloud Type: medium
11%
0.0 In
06:00

SE
SE

 6 / 12 mph 59 / 58°F 88% 1021 mb
Low level cloud: 1%
Mid level cloud: 71%
High level cloud: 28%
Most Significant Cloud Type: medium
75%
0.0 In
12:00

ENE
ENE

 4 / 7 mph 63 / 63°F 65% 1031 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
18:00

SSE
SSE

 5 / 10 mph 65 / 65°F 78% 1024 mb
Low level cloud: 5%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: medium
74%
0.0 In
Sat 04
Oct		00:00

NNE
NNE

 5 / 8 mph 59 / 59°F 77% 1031 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

E
E

 6 / 11 mph 57 / 57°F 89% 1024 mb
Low level cloud: 11%
Mid level cloud: 21%
High level cloud: 76%
Most Significant Cloud Type: low
26%
0.0 In
12:00

ENE
ENE

 8 / 14 mph 64 / 64°F 61% 1031 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 20%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

SE
SE

 8 / 15 mph 63 / 63°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 05
Oct		00:00

NE
NE

 9 / 15 mph 55 / 52°F 77% 1031 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 18%
Most Significant Cloud Type: high
18%
0.0 In
06:00

E
E

 11 / 23 mph 51 / 47°F 85% 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

ENE
ENE

 14 / 23 mph 62 / 62°F 68% 1030 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
18:00

ESE
ESE

 11 / 21 mph 57 / 55°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
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