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Glaslyn 14 Day Long Range Forecast

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

Gwynedd, United Kingdom

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

Taking a look at Glaslyn over the coming two weeks and the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 14°C expected on the evening of Sunday 19th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Thursday 23rd at 5°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Wednesday 22nd will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

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

NNE
NNE

 8 / 16 mph 56 / 52°F 78% 1015 mb
Low level cloud: 25%
Mid level cloud: 8%
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

NNE
NNE

 6 / 12 mph 55 / 51°F 84% 1015 mb
Low level cloud: 53%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 5 / 11 mph 55 / 52°F 93% 1016 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

ENE
ENE

 5 / 10 mph 54 / 53°F 93% 1016 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
03:00

ENE
ENE

 5 / 10 mph 52 / 51°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 4 / 8 mph 55 / 53°F 74% 1017 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
09:00

NE
NE

 4 / 9 mph 55 / 52°F 60% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 6 / 14 mph 57 / 54°F 52% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 8 / 16 mph 57 / 54°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 6 / 13 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%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 5 / 9 mph 57 / 55°F 78% 1017 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
Mon 20
May		00:00

ESE
ESE

 4 / 9 mph 53 / 52°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 4 / 9 mph 51 / 50°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 4 / 7 mph 55 / 53°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 4 / 8 mph 55 / 53°F 56% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 5%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 5 / 11 mph 57 / 54°F 62% 1014 mb
Low level cloud: 3%
Mid level cloud: 21%
High level cloud: 16%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 6 / 13 mph 56 / 53°F 73% 1013 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 5 / 10 mph 55 / 52°F 81% 1013 mb
Low level cloud: 27%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 4 / 9 mph 56 / 54°F 90% 1013 mb
Low level cloud: 60%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

E
E

 4 / 6 mph 55 / 55°F 90% 1012 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 4 / 6 mph 54 / 53°F 89% 1011 mb
Low level cloud: 31%
Mid level cloud: 21%
High level cloud: 13%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 4 / 6 mph 53 / 51°F 88% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 4 / 8 mph 52 / 50°F 57% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 3 / 6 mph 55 / 53°F 51% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 4 / 8 mph 55 / 53°F 57% 1009 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 2 / 3 mph 53 / 51°F 66% 1009 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 96%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 2 / 4 mph 54 / 52°F 77% 1010 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

W
W

 0 / 0 mph 51 / 51°F 77% 1010 mb
Low level cloud: 2%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 2 / 3 mph 50 / 50°F 72% 1010 mb
Low level cloud: 0%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 2 / 4 mph 54 / 53°F 74% 1010 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 4 / 9 mph 49 / 46°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 5 / 10 mph 48 / 46°F 78% 1009 mb
Low level cloud: 53%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 5 / 11 mph 45 / 42°F 97% 1009 mb
Low level cloud: 91%
Mid level cloud: 59%
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

WNW
WNW

 7 / 15 mph 45 / 41°F 99% 1008 mb
Low level cloud: 96%
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
21:00

NW
NW

 8 / 17 mph 45 / 40°F 99% 1007 mb
Low level cloud: 99%
Mid level cloud: 61%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Thu 23
May		00:00

WNW
WNW

 9 / 19 mph 44 / 39°F 99% 1005 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

WSW
WSW

 4 / 9 mph 44 / 42°F 99% 1004 mb
Low level cloud: 95%
Mid level cloud: 49%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSE
SSE

 5 / 10 mph 44 / 41°F 98% 1005 mb
Low level cloud: 94%
Mid level cloud: 78%
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

S
S

 7 / 16 mph 44 / 40°F 96% 1006 mb
Low level cloud: 80%
Mid level cloud: 48%
High level cloud: 7%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 6 / 13 mph 48 / 44°F 88% 1008 mb
Low level cloud: 75%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 9 / 18 mph 48 / 44°F 89% 1010 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 6 / 14 mph 49 / 45°F 89% 1011 mb
Low level cloud: 68%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 5 / 9 mph 52 / 49°F 94% 1013 mb
Low level cloud: 40%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

SSE
SSE

 5 / 9 mph 50 / 48°F 93% 1014 mb
Low level cloud: 20%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 4 / 8 mph 48 / 46°F 92% 1015 mb
Low level cloud: 3%
Mid level cloud: 20%
High level cloud: 21%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 3 / 6 mph 47 / 46°F 86% 1016 mb
Low level cloud: 12%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 1 / 3 mph 48 / 48°F 75% 1016 mb
Low level cloud: 77%
Mid level cloud: 90%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 3 / 6 mph 52 / 50°F 75% 1016 mb
Low level cloud: 52%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 4 / 8 mph 51 / 49°F 77% 1017 mb
Low level cloud: 73%
Mid level cloud: 54%
High level cloud: 5%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 3 / 7 mph 48 / 46°F 85% 1017 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 4 / 6 mph 51 / 49°F 92% 1018 mb
Low level cloud: 14%
Mid level cloud: 20%
High level cloud: 33%
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
Sat 25
May		00:00

ENE
ENE

 6 / 13 mph 53 / 51°F 95% 1021 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
06:00

S
S

 7 / 14 mph 42 / 37°F 89% 1024 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 15%
Most Significant Cloud Type: medium
43%
0.0 In
12:00

SSW
SSW

 14 / 28 mph 46 / 40°F 77% 1019 mb
Low level cloud: 65%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
18:00

SSW
SSW

 3 / 6 mph 53 / 53°F 73% 1018 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
62%
0.0 In
Sun 26
May		00:00

ESE
ESE

 5 / 10 mph 53 / 52°F 88% 1013 mb
Low level cloud: 93%
Mid level cloud: 80%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 5 / 11 mph 47 / 44°F 90% 1017 mb
Low level cloud: 91%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 7 / 16 mph 47 / 44°F 81% 1006 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 97%
Most Significant Cloud Type: low
74%
0.0 In
18:00

E
E

 6 / 10 mph 59 / 58°F 92% 1012 mb
Low level cloud: 25%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 27
May		00:00

WSW
WSW

 2 / 4 mph 44 / 45°F 94% 1009 mb
Low level cloud: 67%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
83%
0.0 In
06:00

ENE
ENE

 4 / 8 mph 49 / 48°F 97% 1011 mb
Low level cloud: 95%
Mid level cloud: 97%
High level cloud: 27%
Most Significant Cloud Type: low
100%
0.2 In
12:00

NW
NW

 7 / 15 mph 46 / 43°F 88% 1010 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 39%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 4 / 9 mph 52 / 51°F 98% 1010 mb
Low level cloud: 85%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Tue 28
May		00:00

NW
NW

 6 / 13 mph 44 / 41°F 99% 1011 mb
Low level cloud: 99%
Mid level cloud: 85%
High level cloud: 55%
Most Significant Cloud Type: low
100%
0.2 In
06:00

ENE
ENE

 3 / 7 mph 46 / 45°F 93% 1010 mb
Low level cloud: 24%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
36%
0.1 In
12:00

NNW
NNW

 4 / 9 mph 50 / 49°F 71% 1013 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
39%
0.1 In
18:00

NNE
NNE

 4 / 8 mph 52 / 51°F 88% 1010 mb
Low level cloud: 62%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
73%
0.3 In
Wed 29
May		00:00

SSE
SSE

 6 / 12 mph 50 / 48°F 96% 1014 mb
Low level cloud: 65%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: low
69%
0.0 In
06:00

S
S

 3 / 6 mph 45 / 44°F 95% 1011 mb
Low level cloud: 68%
Mid level cloud: 56%
High level cloud: 7%
Most Significant Cloud Type: low
88%
0.0 In
12:00

SSE
SSE

 6 / 13 mph 44 / 41°F 97% 1008 mb
Low level cloud: 95%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
18:00

SSW
SSW

 7 / 14 mph 48 / 45°F 92% 1010 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.2 In
Thu 30
May		00:00

SSW
SSW

 9 / 18 mph 45 / 40°F 97% 1005 mb
Low level cloud: 74%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
90%
0.4 In
06:00

S
S

 9 / 19 mph 43 / 38°F 94% 1010 mb
Low level cloud: 54%
Mid level cloud: 5%
High level cloud: 38%
Most Significant Cloud Type: low
60%
0.0 In
12:00

SW
SW

 13 / 27 mph 47 / 41°F 83% 1006 mb
Low level cloud: 58%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.1 In
18:00

ESE
ESE

 2 / 5 mph 49 / 49°F 93% 1006 mb
Low level cloud: 86%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Fri 31
May		00:00

SW
SW

 9 / 19 mph 45 / 40°F 95% 1009 mb
Low level cloud: 67%
Mid level cloud: 31%
High level cloud: 7%
Most Significant Cloud Type: low
78%
0.1 In
06:00

S
S

 4 / 8 mph 45 / 44°F 95% 1002 mb
Low level cloud: 51%
Mid level cloud: 49%
High level cloud: 94%
Most Significant Cloud Type: low
79%
0.3 In
12:00

SW
SW

 13 / 28 mph 49 / 44°F 74% 1011 mb
Low level cloud: 36%
Mid level cloud: 23%
High level cloud: 15%
Most Significant Cloud Type: low
46%
0.0 In
18:00

S
S

 4 / 9 mph 52 / 51°F 77% 1002 mb
Low level cloud: 49%
Mid level cloud: 32%
High level cloud: 20%
Most Significant Cloud Type: low
62%
0.1 In
Sat 01
Jun		00:00

SE
SE

 4 / 9 mph 44 / 42°F 95% 1010 mb
Low level cloud: 91%
Mid level cloud: 62%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SE
SE

 3 / 7 mph 46 / 45°F 89% 1002 mb
Low level cloud: 54%
Mid level cloud: 14%
High level cloud: 36%
Most Significant Cloud Type: low
63%
0.0 In
12:00

S
S

 10 / 21 mph 55 / 52°F 85% 1005 mb
Low level cloud: 69%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
85%
0.4 In
18:00

SW
SW

 2 / 5 mph 51 / 51°F 79% 1004 mb
Low level cloud: 25%
Mid level cloud: 19%
High level cloud: 17%
Most Significant Cloud Type: low
34%
0.2 In
Sun 02
Jun		00:00

SSE
SSE

 13 / 26 mph 52 / 47°F 87% 998 mb
Low level cloud: 88%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
06:00

E
E

 2 / 3 mph 47 / 47°F 89% 1007 mb
Low level cloud: 49%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
58%
0.0 In
12:00

SSW
SSW

 21 / 45 mph 49 / 42°F 78% 1011 mb
Low level cloud: 24%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.1 In
18:00

NW
NW

 2 / 5 mph 50 / 51°F 85% 1010 mb
Low level cloud: 23%
Mid level cloud: 48%
High level cloud: 1%
Most Significant Cloud Type: low
40%
0.2 In

Other Locations Near to Glaslyn

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