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Hudnall 14 Day Long Range Forecast

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

Hertfordshire, United Kingdom

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

Over the next 14 days the Hudnall forecast suggests the average daytime maximum temperature will be around 6°C, with a high for the two weeks of 11°C expected on the morning of Monday 25th. The average minimum temperature will be 2°C, dipping to its lowest on the morning of Wednesday 20th at -2°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain or sleet. Current predictions suggest Sunday 24th will have the most precipitation with an accumulation of around 23.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 15
Nov		15:00

WSW
WSW

 6 / 9 mph 48 / 45°F 85% 1025 mb
Low level cloud: 6%
Mid level cloud: 2%
High level cloud: 69%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 6 / 8 mph 47 / 44°F 94% 1025 mb
Low level cloud: 15%
Mid level cloud: 1%
High level cloud: 75%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 7 / 10 mph 44 / 40°F 95% 1024 mb
Low level cloud: 13%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 16
Nov		00:00

WSW
WSW

 6 / 9 mph 43 / 40°F 94% 1023 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 6 / 12 mph 42 / 37°F 94% 1022 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 7 / 14 mph 40 / 36°F 95% 1021 mb
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 7 / 13 mph 43 / 39°F 90% 1020 mb
Low level cloud: 65%
Mid level cloud: 3%
High level cloud: 94%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 8 / 14 mph 46 / 42°F 87% 1018 mb
Low level cloud: 91%
Mid level cloud: 12%
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

WSW
WSW

 9 / 15 mph 48 / 43°F 92% 1017 mb
Low level cloud: 55%
Mid level cloud: 90%
High level cloud: 14%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 7 / 13 mph 46 / 42°F 97% 1016 mb
Low level cloud: 87%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 7 / 12 mph 44 / 40°F 89% 1017 mb
Low level cloud: 92%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 17
Nov		00:00

WNW
WNW

 8 / 13 mph 44 / 40°F 84% 1016 mb
Low level cloud: 27%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 9 / 14 mph 43 / 38°F 89% 1015 mb
Low level cloud: 21%
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
06:00

W
W

 10 / 17 mph 41 / 35°F 89% 1015 mb
Low level cloud: 51%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 10 / 15 mph 43 / 37°F 87% 1015 mb
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 14 / 19 mph 46 / 40°F 67% 1015 mb
Low level cloud: 8%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 13 / 20 mph 44 / 38°F 70% 1015 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 9 / 16 mph 40 / 35°F 80% 1016 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 9 / 16 mph 38 / 32°F 87% 1018 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Nov		00:00

W
W

 6 / 11 mph 36 / 31°F 91% 1018 mb
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 9 mph 36 / 31°F 93% 1017 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 7 / 11 mph 37 / 32°F 91% 1013 mb
Low level cloud: 98%
Mid level cloud: 60%
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

SE
SE

 8 / 13 mph 40 / 34°F 98% 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
12:00

WSW
WSW

 9 / 14 mph 45 / 40°F 97% 1005 mb
Low level cloud: 99%
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
15:00

WSW
WSW

 7 / 12 mph 45 / 41°F 98% 1002 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 71%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 15 / 24 mph 49 / 43°F 96% 999 mb
Low level cloud: 100%
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

 7 / 11 mph 43 / 39°F 97% 998 mb
Low level cloud: 99%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 19
Nov		00:00

N
N

 13 / 18 mph 37 / 28°F 96% 999 mb
Low level cloud: 100%
Mid level cloud: 75%
High level cloud: 83%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNW
NNW

 13 / 19 mph 36 / 27°F 97% 1002 mb
Low level cloud: 98%
Mid level cloud: 43%
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

NNW
NNW

 14 / 20 mph 34 / 24°F 96% 1005 mb
Low level cloud: 96%
Mid level cloud: 38%
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

NW
NW

 12 / 17 mph 34 / 26°F 88% 1008 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 12 / 16 mph 38 / 30°F 66% 1009 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
15:00

NW
NW

 8 / 11 mph 37 / 31°F 71% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 6 / 9 mph 32 / 27°F 85% 1009 mb
Low level cloud: 12%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 5 / 9 mph 32 / 26°F 82% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Nov		00:00

NW
NW

 7 / 11 mph 31 / 24°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 8 / 13 mph 31 / 23°F 76% 1010 mb
Low level cloud: 0%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 7 / 12 mph 31 / 24°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 8 / 13 mph 33 / 25°F 72% 1011 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 16 / 22 mph 38 / 28°F 66% 1010 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 17 / 26 mph 37 / 27°F 67% 1010 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 10 / 17 mph 33 / 25°F 81% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 10 / 17 mph 32 / 24°F 77% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 21
Nov		00:00

WSW
WSW

 12 / 17 mph 34 / 25°F 72% 1011 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 9 / 16 mph 33 / 25°F 71% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 9 / 17 mph 32 / 24°F 70% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 6 / 10 mph 34 / 29°F 67% 1005 mb
Low level cloud: 0%
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
12:00

SSW
SSW

 3 / 4 mph 37 / 36°F 65% 1001 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 5 / 6 mph 39 / 35°F 70% 998 mb
Low level cloud: 84%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 10 / 12 mph 38 / 31°F 92% 999 mb
Low level cloud: 47%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 18 / 28 mph 35 / 24°F 77% 1002 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 22
Nov		00:00

NW
NW

 19 / 34 mph 35 / 25°F 89% 1001 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 9 / 19 mph 26 / 17°F 93% 1012 mb
Low level cloud: 5%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: medium
31%
0.0 In
12:00

WSW
WSW

 11 / 15 mph 35 / 28°F 89% 1010 mb
Low level cloud: 14%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

W
W

 6 / 8 mph 36 / 30°F 93% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sat 23
Nov		00:00

SW
SW

 5 / 9 mph 33 / 29°F 91% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 85%
Most Significant Cloud Type: high
84%
0.0 In
06:00

SSW
SSW

 6 / 13 mph 35 / 29°F 83% 1012 mb
Low level cloud: 86%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 8 / 11 mph 37 / 31°F 89% 1009 mb
Low level cloud: 29%
Mid level cloud: 98%
High level cloud: 66%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NNW
NNW

 13 / 18 mph 37 / 29°F 100% 997 mb
Low level cloud: 97%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sun 24
Nov		00:00

E
E

 14 / 23 mph 37 / 28°F 99% 1004 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.3 In
06:00

NE
NE

 10 / 21 mph 34 / 26°F 95% 1009 mb
Low level cloud: 66%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

 10 / 18 mph 44 / 38°F 99% 1000 mb
Low level cloud: 99%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.5 In
18:00

ESE
ESE

 19 / 36 mph 39 / 29°F 98% 999 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.8 In
Mon 25
Nov		00:00

S
S

 21 / 34 mph 55 / 50°F 87% 993 mb
Low level cloud: 50%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
85%
0.0 In
06:00

S
S

 15 / 28 mph 52 / 48°F 83% 990 mb
Low level cloud: 0%
Mid level cloud: 95%
High level cloud: 40%
Most Significant Cloud Type: medium
96%
0.1 In
12:00

S
S

 27 / 41 mph 58 / 53°F 79% 985 mb
Low level cloud: 81%
Mid level cloud: 56%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 26 / 42 mph 57 / 52°F 84% 986 mb
Low level cloud: 62%
Mid level cloud: 93%
High level cloud: 79%
Most Significant Cloud Type: low
100%
0.0 In
Tue 26
Nov		00:00

SSW
SSW

 23 / 37 mph 47 / 39°F 76% 993 mb
Low level cloud: 23%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.1 In
06:00

SSW
SSW

 14 / 26 mph 44 / 37°F 82% 990 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

S
S

 13 / 20 mph 49 / 44°F 77% 992 mb
Low level cloud: 18%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
36%
0.0 In
18:00

SW
SW

 24 / 38 mph 48 / 40°F 73% 993 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
Wed 27
Nov		00:00

S
S

 15 / 25 mph 45 / 38°F 82% 990 mb
Low level cloud: 20%
Mid level cloud: 31%
High level cloud: 97%
Most Significant Cloud Type: low
42%
0.0 In
06:00

SSW
SSW

 11 / 18 mph 42 / 35°F 87% 991 mb
Low level cloud: 63%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 9 / 15 mph 48 / 44°F 89% 983 mb
Low level cloud: 66%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
86%
0.2 In
18:00

WSW
WSW

 18 / 30 mph 38 / 29°F 81% 992 mb
Low level cloud: 33%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
40%
0.7 In
Thu 28
Nov		00:00

WSW
WSW

 10 / 17 mph 46 / 41°F 93% 990 mb
Low level cloud: 22%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.1 In
06:00

SW
SW

 9 / 18 mph 36 / 29°F 91% 999 mb
Low level cloud: 39%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
66%
0.0 In
12:00

NW
NW

 15 / 27 mph 41 / 33°F 94% 997 mb
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 3 / 5 mph 45 / 44°F 90% 1007 mb
Low level cloud: 79%
Mid level cloud: 97%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.0 In
Fri 29
Nov		00:00

W
W

 7 / 13 mph 36 / 31°F 86% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

NE
NE

 12 / 20 mph 39 / 32°F 92% 1007 mb
Low level cloud: 95%
Mid level cloud: 93%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 14 / 26 mph 40 / 32°F 76% 1009 mb
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.0 In
18:00

ENE
ENE

 23 / 38 mph 42 / 33°F 95% 1004 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
Sat 30
Nov		00:00

NW
NW

 14 / 26 mph 34 / 24°F 78% 1018 mb
Low level cloud: 23%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
06:00

NE
NE

 17 / 28 mph 38 / 29°F 96% 1011 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 72%
Most Significant Cloud Type: low
100%
0.7 In
12:00

NNE
NNE

 12 / 22 mph 40 / 33°F 81% 1023 mb
Low level cloud: 44%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
18:00

NE
NE

 11 / 19 mph 42 / 36°F 78% 1022 mb
Low level cloud: 65%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
66%
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