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Roundham 14 Day Long Range Forecast

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

Somerset, United Kingdom

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

The forecast for Roundham in the coming two weeks is predicting 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 Friday 24th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 8°C. The coming 14 days will have most days seeing a little rain. The indicators are that Saturday 18th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 17
May
00:00

SE
SE

1 / 3 kts 52 / 53°F 90%
Low level cloud: 7%
Mid level cloud: 51%
High level cloud: 32%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

2 / 4 kts 51 / 51°F 89%
Low level cloud: 2%
Mid level cloud: 49%
High level cloud: 50%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

3 / 5 kts 54 / 51°F 88%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 7 kts 59 / 56°F 85%
Low level cloud: 53%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

6 / 8 kts 60 / 57°F 86%
Low level cloud: 36%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

4 / 5 kts 58 / 58°F 86%
Low level cloud: 22%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

0 / 1 kts 58 / 56°F 87%
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

2 / 5 kts 53 / 53°F 87%
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 33%
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

NNW
NNW

4 / 8 kts 52 / 51°F 92%
Low level cloud: 2%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

4 / 9 kts 52 / 50°F 89%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 48%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

5 / 9 kts 55 / 53°F 94%
Low level cloud: 24%
Mid level cloud: 89%
High level cloud: 49%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

6 / 8 kts 60 / 59°F 90%
Low level cloud: 88%
Mid level cloud: 68%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

4 / 7 kts 61 / 61°F 87%
Low level cloud: 86%
Mid level cloud: 66%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NE
NE

0 / 1 kts 64 / 62°F 83%
Low level cloud: 62%
Mid level cloud: 31%
High level cloud: 79%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

3 / 5 kts 64 / 62°F 91%
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
35%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

3 / 6 kts 57 / 57°F 94%
Low level cloud: 13%
Mid level cloud: 12%
High level cloud: 4%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

6 / 13 kts 54 / 52°F 95%
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNE
NNE

7 / 14 kts 51 / 47°F 96%
Low level cloud: 28%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

8 / 13 kts 52 / 47°F 93%
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

10 / 13 kts 58 / 55°F 82%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

9 / 12 kts 64 / 63°F 72%
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

8 / 12 kts 66 / 64°F 72%
Low level cloud: 36%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

8 / 14 kts 63 / 62°F 81%
Low level cloud: 11%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

7 / 15 kts 56 / 53°F 90%
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
Mon 20
May
00:00

NNE
NNE

7 / 14 kts 52 / 49°F 93%
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

7 / 16 kts 47 / 42°F 92%
Low level cloud: 1%
Mid level cloud: 6%
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

9 / 14 kts 49 / 44°F 93%
Low level cloud: 20%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

12 / 14 kts 56 / 52°F 81%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

10 / 12 kts 63 / 61°F 75%
Low level cloud: 45%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

6 / 10 kts 63 / 62°F 76%
Low level cloud: 86%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

6 / 11 kts 62 / 60°F 84%
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

5 / 12 kts 55 / 52°F 89%
Low level cloud: 57%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NE
NE

5 / 9 kts 51 / 49°F 91%
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

5 / 10 kts 48 / 46°F 89%
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
06:00

NNE
NNE

4 / 7 kts 50 / 47°F 88%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

4 / 5 kts 58 / 56°F 76%
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
12:00

NNW
NNW

2 / 2 kts 63 / 60°F 70%
Low level cloud: 23%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

1 / 2 kts 64 / 61°F 72%
Low level cloud: 48%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

3 / 5 kts 63 / 60°F 83%
Low level cloud: 14%
Mid level cloud: 9%
High level cloud: 46%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

5 / 11 kts 54 / 50°F 87%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 57%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NW
NW

7 / 14 kts 50 / 47°F 93%
Low level cloud: 8%
Mid level cloud: 32%
High level cloud: 29%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 12 kts 50 / 47°F 93%
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

5 / 7 kts 55 / 51°F 93%
Low level cloud: 39%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

9 / 11 kts 59 / 56°F 81%
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

9 / 12 kts 62 / 61°F 77%
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

11 / 16 kts 62 / 61°F 79%
Low level cloud: 40%
Mid level cloud: 21%
High level cloud: 31%
Most Significant Cloud Type: low
51%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

7 / 12 kts 59 / 57°F 85%
Low level cloud: 26%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 10 kts 53 / 49°F 90%
Low level cloud: 15%
Mid level cloud: 14%
High level cloud: 15%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WNW
WNW

6 / 13 kts 47 / 44°F 95%
Low level cloud: 41%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 10 kts 48 / 45°F 93%
Low level cloud: 48%
Mid level cloud: 20%
High level cloud: 20%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

3 / 4 kts 50 / 49°F 91%
Low level cloud: 54%
Mid level cloud: 45%
High level cloud: 78%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

1 / 1 kts 55 / 55°F 83%
Low level cloud: 67%
Mid level cloud: 69%
High level cloud: 20%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

3 / 3 kts 57 / 57°F 81%
Low level cloud: 79%
Mid level cloud: 48%
High level cloud: 18%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

3 / 4 kts 60 / 58°F 79%
Low level cloud: 47%
Mid level cloud: 25%
High level cloud: 8%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

3 / 4 kts 60 / 58°F 84%
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

5 / 12 kts 53 / 50°F 91%
Low level cloud: 16%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
00:00

WNW
WNW

6 / 14 kts 56 / 54°F 97%
Low level cloud: 94%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
96%
0.0 In
06:00

NNE
NNE

7 / 16 kts 50 / 47°F 96%
Low level cloud: 87%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

10 / 21 kts 61 / 61°F 83%
Low level cloud: 11%
Mid level cloud: 7%
High level cloud: 81%
Most Significant Cloud Type: low
23%
0.0 In
18:00

ESE
ESE

11 / 23 kts 58 / 55°F 90%
Low level cloud: 70%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
Sat 25
May
00:00

N
N

12 / 25 kts 56 / 52°F 97%
Low level cloud: 75%
Mid level cloud: 47%
High level cloud: 7%
Most Significant Cloud Type: low
92%
0.0 In
06:00

NW
NW

4 / 9 kts 53 / 51°F 81%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

NE
NE

12 / 26 kts 60 / 60°F 88%
Low level cloud: 91%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

6 / 12 kts 61 / 61°F 90%
Low level cloud: 62%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
77%
0.0 In
Sun 26
May
00:00

ENE
ENE

7 / 16 kts 53 / 50°F 96%
Low level cloud: 100%
Mid level cloud: 74%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WSW
WSW

4 / 9 kts 56 / 56°F 97%
Low level cloud: 90%
Mid level cloud: 58%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

12 / 26 kts 58 / 55°F 94%
Low level cloud: 91%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

7 / 16 kts 62 / 62°F 92%
Low level cloud: 72%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
Mon 27
May
00:00

NE
NE

3 / 7 kts 50 / 49°F 91%
Low level cloud: 6%
Mid level cloud: 42%
High level cloud: 9%
Most Significant Cloud Type: medium
60%
0.0 In
06:00

NNW
NNW

3 / 7 kts 56 / 56°F 91%
Low level cloud: 4%
Mid level cloud: 21%
High level cloud: 7%
Most Significant Cloud Type: medium
33%
0.0 In
12:00

NNE
NNE

8 / 18 kts 63 / 63°F 83%
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
18:00

SSW
SSW

1 / 3 kts 63 / 63°F 91%
Low level cloud: 72%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
Tue 28
May
00:00

NNE
NNE

7 / 14 kts 51 / 48°F 92%
Low level cloud: 45%
Mid level cloud: 23%
High level cloud: 4%
Most Significant Cloud Type: low
53%
0.1 In
06:00

SSW
SSW

6 / 13 kts 57 / 56°F 97%
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

4 / 9 kts 65 / 65°F 69%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
17%
0.0 In
18:00

NW
NW

13 / 27 kts 51 / 46°F 89%
Low level cloud: 22%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
33%
0.1 In
Wed 29
May
00:00

NNE
NNE

6 / 12 kts 54 / 52°F 89%
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

NW
NW

9 / 20 kts 48 / 43°F 89%
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

E
E

4 / 9 kts 65 / 65°F 73%
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
12%
0.0 In
18:00

WNW
WNW

12 / 25 kts 55 / 51°F 77%
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: medium
19%
0.0 In
Thu 30
May
00:00

NE
NE

6 / 13 kts 54 / 52°F 91%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
11%
0.0 In
06:00

NW
NW

5 / 10 kts 50 / 48°F 87%
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
12:00

ENE
ENE

9 / 20 kts 65 / 65°F 74%
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
18:00

WSW
WSW

5 / 11 kts 59 / 58°F 80%
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 21%
Most Significant Cloud Type: low
11%
0.0 In
Fri 31
May
00:00

NNE
NNE

9 / 20 kts 55 / 52°F 96%
Low level cloud: 49%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
06:00

S
S

15 / 33 kts 51 / 45°F 95%
Low level cloud: 95%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

14 / 30 kts 65 / 65°F 73%
Low level cloud: 34%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
18:00

WSW
WSW

7 / 16 kts 58 / 56°F 94%
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
Sat 01
Jun
00:00

NNE
NNE

8 / 18 kts 52 / 49°F 90%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

WSW
WSW

4 / 9 kts 53 / 52°F 87%
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
12:00

N
N

15 / 33 kts 63 / 63°F 67%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
18:00

SW
SW

15 / 33 kts 54 / 49°F 82%
Low level cloud: 4%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
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