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Upper Up 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Upper Up

Wiltshire, United Kingdom

Long range weather outlook for Upper Up includes 14 day forecast summary:

The outlook for Upper Up in the two weeks ahead shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the afternoon of Friday 24th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Tuesday 21st at 4°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 22.0mm. On the whole winds are likely to be moderate.

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

SE
SE

13 / 16 mph 63 / 62°F 67% 1004 mb
Low level cloud: 45%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

9 / 11 mph 62 / 60°F 82% 1005 mb
Low level cloud: 8%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

6 / 12 mph 52 / 50°F 92% 1006 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
Thu 16
May
00:00

E
E

5 / 10 mph 49 / 47°F 92% 1006 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 29%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

5 / 11 mph 47 / 45°F 94% 1006 mb
Low level cloud: 13%
Mid level cloud: 12%
High level cloud: 59%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

5 / 8 mph 52 / 49°F 93% 1006 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

7 / 8 mph 59 / 57°F 84% 1006 mb
Low level cloud: 36%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

8 / 11 mph 59 / 57°F 86% 1006 mb
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NE
NE

5 / 7 mph 58 / 57°F 88% 1006 mb
Low level cloud: 12%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: medium
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

6 / 8 mph 57 / 54°F 94% 1006 mb
Low level cloud: 22%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

3 / 4 mph 52 / 52°F 97% 1006 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

WSW
WSW

1 / 3 mph 49 / 49°F 96% 1006 mb
Low level cloud: 30%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

3 / 6 mph 49 / 48°F 95% 1007 mb
Low level cloud: 26%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

3 / 5 mph 54 / 52°F 94% 1007 mb
Low level cloud: 25%
Mid level cloud: 17%
High level cloud: 17%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

6 / 7 mph 61 / 60°F 81% 1009 mb
Low level cloud: 71%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

7 / 9 mph 66 / 64°F 72% 1009 mb
Low level cloud: 39%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

6 / 7 mph 67 / 64°F 70% 1010 mb
Low level cloud: 19%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

4 / 5 mph 66 / 63°F 85% 1011 mb
Low level cloud: 12%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

2 / 4 mph 54 / 55°F 90% 1012 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 72%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NW
NW

1 / 1 mph 51 / 51°F 91% 1013 mb
Low level cloud: 9%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

3 / 6 mph 50 / 50°F 93% 1013 mb
Low level cloud: 11%
Mid level cloud: 20%
High level cloud: 95%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

4 / 6 mph 55 / 52°F 94% 1014 mb
Low level cloud: 23%
Mid level cloud: 39%
High level cloud: 98%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

7 / 8 mph 61 / 61°F 87% 1014 mb
Low level cloud: 94%
Mid level cloud: 14%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

9 / 13 mph 65 / 64°F 81% 1014 mb
Low level cloud: 84%
Mid level cloud: 6%
High level cloud: 19%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

8 / 11 mph 65 / 64°F 80% 1014 mb
Low level cloud: 76%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

8 / 12 mph 64 / 62°F 89% 1014 mb
Low level cloud: 5%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

6 / 13 mph 54 / 52°F 95% 1015 mb
Low level cloud: 51%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

5 / 10 mph 53 / 51°F 97% 1016 mb
Low level cloud: 85%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 10 mph 52 / 50°F 98% 1016 mb
Low level cloud: 71%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

7 / 10 mph 53 / 50°F 97% 1016 mb
Low level cloud: 82%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 14 mph 56 / 53°F 91% 1017 mb
Low level cloud: 98%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 13 mph 58 / 55°F 86% 1017 mb
Low level cloud: 95%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

12 / 14 mph 61 / 60°F 81% 1017 mb
Low level cloud: 85%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

12 / 17 mph 59 / 56°F 87% 1017 mb
Low level cloud: 36%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 15 mph 53 / 48°F 96% 1018 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

10 / 15 mph 46 / 41°F 97% 1019 mb
Low level cloud: 64%
Mid level cloud: 2%
High level cloud: 8%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

10 / 15 mph 45 / 40°F 96% 1019 mb
Low level cloud: 85%
Mid level cloud: 7%
High level cloud: 17%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

10 / 14 mph 47 / 42°F 94% 1019 mb
Low level cloud: 94%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

13 / 15 mph 54 / 49°F 77% 1019 mb
Low level cloud: 73%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 13 mph 59 / 56°F 68% 1019 mb
Low level cloud: 55%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

11 / 13 mph 61 / 60°F 67% 1017 mb
Low level cloud: 23%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

9 / 11 mph 59 / 56°F 77% 1017 mb
Low level cloud: 8%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

7 / 14 mph 48 / 44°F 92% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

ENE
ENE

6 / 12 mph 43 / 39°F 94% 1017 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 11 mph 39 / 35°F 95% 1017 mb
Low level cloud: 17%
Mid level cloud: 43%
High level cloud: 57%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

7 / 9 mph 44 / 40°F 95% 1016 mb
Low level cloud: 73%
Mid level cloud: 54%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

7 / 8 mph 55 / 51°F 76% 1015 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 9 mph 63 / 60°F 68% 1014 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

8 / 10 mph 62 / 61°F 80% 1013 mb
Low level cloud: 68%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 10 mph 63 / 60°F 90% 1012 mb
Low level cloud: 38%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

8 / 14 mph 54 / 51°F 97% 1013 mb
Low level cloud: 77%
Mid level cloud: 24%
High level cloud: 9%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May
00:00

WSW
WSW

7 / 14 mph 51 / 49°F 97% 1010 mb
Low level cloud: 38%
Mid level cloud: 43%
High level cloud: 45%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

6 / 14 mph 51 / 48°F 94% 1012 mb
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

8 / 17 mph 56 / 54°F 96% 1011 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

8 / 16 mph 60 / 60°F 88% 1013 mb
Low level cloud: 68%
Mid level cloud: 37%
High level cloud: 1%
Most Significant Cloud Type: low
81%
0.0 In
Thu 23
May
00:00

NNE
NNE

4 / 9 mph 53 / 52°F 97% 1014 mb
Low level cloud: 60%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

6 / 12 mph 55 / 54°F 95% 1020 mb
Low level cloud: 29%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
33%
0.0 In
12:00

NNW
NNW

16 / 33 mph 51 / 46°F 95% 1021 mb
Low level cloud: 88%
Mid level cloud: 95%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

7 / 16 mph 62 / 62°F 94% 1017 mb
Low level cloud: 76%
Mid level cloud: 25%
High level cloud: 21%
Most Significant Cloud Type: low
87%
0.0 In
Fri 24
May
00:00

NNE
NNE

15 / 32 mph 51 / 46°F 97% 1020 mb
Low level cloud: 98%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
06:00

NNE
NNE

9 / 18 mph 49 / 45°F 95% 1019 mb
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
12:00

E
E

7 / 14 mph 60 / 60°F 91% 1021 mb
Low level cloud: 93%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

11 / 24 mph 63 / 63°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May
00:00

S
S

4 / 8 mph 57 / 57°F 94% 1021 mb
Low level cloud: 7%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
06:00

NNE
NNE

6 / 12 mph 52 / 50°F 92% 1020 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
10%
0.0 In
12:00

SSW
SSW

9 / 19 mph 65 / 65°F 74% 1019 mb
Low level cloud: 92%
Mid level cloud: 0%
High level cloud: 39%
Most Significant Cloud Type: low
97%
0.0 In
18:00

NNW
NNW

2 / 4 mph 73 / 77°F 78% 1016 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 22%
Most Significant Cloud Type: low
24%
0.0 In
Sun 26
May
00:00

ENE
ENE

1 / 3 mph 58 / 58°F 91% 1019 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

N
N

5 / 11 mph 56 / 56°F 91% 1017 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

ENE
ENE

12 / 25 mph 68 / 68°F 84% 1017 mb
Low level cloud: 95%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
18:00

NW
NW

7 / 14 mph 64 / 64°F 86% 1017 mb
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
53%
0.0 In
Mon 27
May
00:00

NE
NE

13 / 27 mph 57 / 54°F 97% 1018 mb
Low level cloud: 56%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: low
57%
0.1 In
06:00

NNW
NNW

8 / 17 mph 50 / 47°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 84%
Most Significant Cloud Type: high
83%
0.0 In
12:00

NE
NE

19 / 40 mph 62 / 62°F 66% 1018 mb
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
18:00

NNW
NNW

9 / 18 mph 62 / 62°F 80% 1019 mb
Low level cloud: 76%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
80%
0.0 In
Tue 28
May
00:00

N
N

15 / 31 mph 52 / 47°F 83% 1012 mb
Low level cloud: 9%
Mid level cloud: 49%
High level cloud: 53%
Most Significant Cloud Type: medium
75%
0.0 In
06:00

N
N

8 / 17 mph 49 / 46°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

NNE
NNE

13 / 26 mph 56 / 53°F 90% 1006 mb
Low level cloud: 93%
Mid level cloud: 29%
High level cloud: 83%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NW
NW

8 / 17 mph 58 / 56°F 79% 1021 mb
Low level cloud: 65%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
73%
0.0 In
Wed 29
May
00:00

ENE
ENE

4 / 9 mph 55 / 55°F 98% 1007 mb
Low level cloud: 57%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
76%
0.1 In
06:00

WSW
WSW

6 / 12 mph 51 / 49°F 92% 1020 mb
Low level cloud: 17%
Mid level cloud: 5%
High level cloud: 95%
Most Significant Cloud Type: low
30%
0.0 In
12:00

ESE
ESE

3 / 7 mph 60 / 60°F 94% 1006 mb
Low level cloud: 86%
Mid level cloud: 24%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.2 In
18:00

WSW
WSW

14 / 29 mph 55 / 51°F 77% 1017 mb
Low level cloud: 1%
Mid level cloud: 95%
High level cloud: 87%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 30
May
00:00

S
S

4 / 8 mph 58 / 59°F 95% 1007 mb
Low level cloud: 10%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: low
17%
0.0 In
06:00

WSW
WSW

9 / 18 mph 54 / 51°F 93% 1015 mb
Low level cloud: 86%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: low
98%
0.0 In
12:00

SW
SW

6 / 12 mph 60 / 60°F 88% 1007 mb
Low level cloud: 9%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

W
W

10 / 21 mph 59 / 59°F 83% 1014 mb
Low level cloud: 48%
Mid level cloud: 9%
High level cloud: 13%
Most Significant Cloud Type: low
53%
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