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Alexandria 14 Day Long Range Forecast

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

Virginia, United States Of America

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

The outlook for Alexandria in the two weeks ahead shows the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 34°C expected on the afternoon of Friday 5th. The mean minimum temperature will be 16°C, dipping to its lowest on the morning of Saturday 13th at 12°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Predictions are Saturday 6th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 04
Sep		16:00

WNW
WNW

 11 / 13 mph 79 / 80°F 58% 1008 mb
Low level cloud: 0%
Mid level cloud: 74%
High level cloud: 36%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 7 mph 71 / 68°F 94% 1010 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 66%
Most Significant Cloud Type: medium
33%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

 5 / 8 mph 66 / 66°F 96% 1012 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 20%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 05
Sep		01:00

SSW
SSW

 3 / 6 mph 64 / 64°F 96% 1012 mb
Low level cloud: 10%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 4 / 8 mph 62 / 62°F 96% 1013 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 6 / 9 mph 67 / 65°F 92% 1014 mb
Low level cloud: 20%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 7 / 9 mph 82 / 83°F 57% 1014 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
13:00

SW
SW

 10 / 12 mph 92 / 91°F 34% 1012 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 10 / 11 mph 94 / 93°F 30% 1011 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 7 / 15 mph 84 / 83°F 47% 1012 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
22:00

S
S

 9 / 12 mph 78 / 81°F 64% 1014 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 06
Sep		01:00

S
S

 11 / 17 mph 77 / 79°F 66% 1013 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
04:00

SSW
SSW

 9 / 12 mph 76 / 79°F 66% 1013 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 5 / 6 mph 77 / 78°F 71% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 5 / 5 mph 87 / 86°F 47% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 9%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 4 / 5 mph 93 / 92°F 38% 1014 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 12 / 15 mph 78 / 79°F 72% 1014 mb
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 5 / 7 mph 71 / 68°F 95% 1016 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 91%
Most Significant Cloud Type: low
72%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
22:00

NNE
NNE

 6 / 7 mph 66 / 66°F 95% 1017 mb
Low level cloud: 86%
Mid level cloud: 49%
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 07
Sep		01:00

NNW
NNW

 6 / 8 mph 64 / 64°F 93% 1017 mb
Low level cloud: 82%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 6 / 8 mph 63 / 63°F 89% 1017 mb
Low level cloud: 21%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 4 / 6 mph 65 / 63°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 4 / 6 mph 67 / 65°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 3 / 4 mph 82 / 78°F 28% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 2 / 2 mph 83 / 78°F 24% 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
19:00

SSE
SSE

 6 / 10 mph 69 / 67°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 1 / 2 mph 65 / 65°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 08
Sep		01:00

N
N

 4 / 7 mph 62 / 62°F 56% 1022 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
04:00

N
N

 5 / 10 mph 61 / 62°F 55% 1023 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
07:00

N
N

 6 / 9 mph 63 / 61°F 57% 1025 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
10:00

NNE
NNE

 6 / 7 mph 75 / 75°F 34% 1026 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
13:00

N
N

 4 / 4 mph 81 / 77°F 27% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 4 / 4 mph 81 / 78°F 28% 1023 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
19:00

E
E

 6 / 9 mph 71 / 68°F 49% 1025 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
22:00

ENE
ENE

 5 / 10 mph 64 / 64°F 54% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 09
Sep		01:00

ENE
ENE

 3 / 6 mph 61 / 61°F 64% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 4 / 8 mph 57 / 58°F 69% 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
07:00

NE
NE

 4 / 6 mph 62 / 60°F 71% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 7 / 8 mph 75 / 76°F 41% 1029 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
13:00

E
E

 9 / 11 mph 79 / 77°F 36% 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
16:00

E
E

 10 / 12 mph 79 / 78°F 40% 1026 mb
Low level cloud: 2%
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
19:00

E
E

 7 / 8 mph 77 / 77°F 62% 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
22:00

E
E

 5 / 6 mph 65 / 65°F 76% 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
Wed 10
Sep		01:00

NE
NE

 5 / 8 mph 61 / 61°F 82% 1026 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 6 / 10 mph 60 / 60°F 89% 1026 mb
Low level cloud: 23%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 6 / 9 mph 65 / 62°F 83% 1026 mb
Low level cloud: 42%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 8 / 9 mph 68 / 68°F 72% 1025 mb
Low level cloud: 97%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 8 / 9 mph 68 / 68°F 78% 1024 mb
Low level cloud: 98%
Mid level cloud: 77%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 7 / 10 mph 64 / 64°F 95% 1022 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 6 / 9 mph 64 / 64°F 96% 1021 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 6 / 9 mph 64 / 64°F 96% 1021 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 11
Sep		01:00

N
N

 3 / 6 mph 74 / 78°F 94% 1018 mb
Low level cloud: 14%
Mid level cloud: 26%
High level cloud: 33%
Most Significant Cloud Type: low
27%
0.0 In
07:00

NNW
NNW

 5 / 9 mph 69 / 69°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 78%
Most Significant Cloud Type: medium
13%
0.0 In
13:00

ENE
ENE

 9 / 13 mph 74 / 76°F 45% 1020 mb
Low level cloud: 97%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

E
E

 3 / 4 mph 80 / 82°F 55% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Fri 12
Sep		01:00

N
N

 10 / 18 mph 63 / 64°F 91% 1017 mb
Low level cloud: 87%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 7 / 15 mph 58 / 56°F 97% 1019 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 8 / 14 mph 75 / 75°F 29% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ENE
ENE

 3 / 6 mph 72 / 76°F 46% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 13
Sep		01:00

NW
NW

 4 / 6 mph 64 / 64°F 51% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

N
N

 2 / 4 mph 66 / 66°F 73% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNW
NNW

 3 / 6 mph 84 / 82°F 26% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

E
E

 4 / 7 mph 73 / 77°F 56% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 14
Sep		01:00

SSW
SSW

 3 / 6 mph 65 / 65°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
0.0 In
07:00

NE
NE

 2 / 4 mph 67 / 67°F 79% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
13:00

SW
SW

 4 / 8 mph 89 / 87°F 30% 1020 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 12%
Most Significant Cloud Type: medium
22%
0.0 In
19:00

SE
SE

 4 / 7 mph 67 / 67°F 64% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 96%
Most Significant Cloud Type: high
96%
0.0 In
Mon 15
Sep		01:00

S
S

 4 / 8 mph 69 / 69°F 67% 1021 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 9%
Most Significant Cloud Type: medium
26%
0.0 In
07:00

E
E

 2 / 4 mph 63 / 63°F 83% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

S
S

 7 / 13 mph 90 / 89°F 33% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

SSW
SSW

 3 / 5 mph 72 / 76°F 75% 1022 mb
Low level cloud: 1%
Mid level cloud: 49%
High level cloud: 86%
Most Significant Cloud Type: medium
56%
0.0 In
Tue 16
Sep		01:00

SSW
SSW

 5 / 9 mph 71 / 71°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
07:00

SSE
SSE

 3 / 4 mph 71 / 71°F 99% 1022 mb
Low level cloud: 99%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

S
S

 7 / 13 mph 91 / 92°F 35% 1018 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
19:00

SSE
SSE

 5 / 9 mph 71 / 71°F 97% 1021 mb
Low level cloud: 92%
Mid level cloud: 89%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.1 In
Wed 17
Sep		01:00

S
S

 5 / 9 mph 76 / 80°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

SE
SE

 4 / 8 mph 67 / 67°F 99% 1019 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SSE
SSE

 7 / 13 mph 90 / 92°F 39% 1016 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 11%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

E
E

 7 / 13 mph 72 / 76°F 97% 1020 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.8 In
Thu 18
Sep		01:00

ENE
ENE

 2 / 3 mph 71 / 71°F 86% 1018 mb
Low level cloud: 70%
Mid level cloud: 60%
High level cloud: 70%
Most Significant Cloud Type: low
99%
0.0 In
07:00

E
E

 6 / 11 mph 67 / 67°F 98% 1019 mb
Low level cloud: 97%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ENE
ENE

 7 / 14 mph 80 / 83°F 69% 1017 mb
Low level cloud: 94%
Mid level cloud: 29%
High level cloud: 76%
Most Significant Cloud Type: low
100%
0.0 In
19:00

ENE
ENE

 7 / 15 mph 69 / 69°F 98% 1018 mb
Low level cloud: 97%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Fri 19
Sep		01:00

ENE
ENE

 9 / 17 mph 72 / 77°F 92% 1011 mb
Low level cloud: 59%
Mid level cloud: 44%
High level cloud: 93%
Most Significant Cloud Type: low
85%
0.0 In
07:00

NE
NE

 6 / 12 mph 68 / 68°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
13:00

NNE
NNE

 17 / 33 mph 73 / 78°F 94% 1004 mb
Low level cloud: 93%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.6 In
19:00

NE
NE

 8 / 17 mph 70 / 70°F 99% 1011 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.4 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