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Ruthven Water 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ruthven Water

Perth and Kinross, United Kingdom

Long range weather outlook for Ruthven Water includes 14 day forecast summary:

Over the next 14 days the Ruthven Water forecast suggests the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 23°C expected on the afternoon of Saturday 18th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Tuesday 21st at 5°C. Expect the next 14 days 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 12.0mm. On the whole winds are likely to be light.

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

NNE
NNE

4 / 9 kts 50 / 48°F 93%
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

NNE
NNE

4 / 9 kts 47 / 44°F 90%
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 2%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

3 / 6 kts 54 / 51°F 80%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

3 / 4 kts 59 / 57°F 78%
Low level cloud: 19%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

4 / 5 kts 67 / 65°F 73%
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

7 / 8 kts 71 / 69°F 66%
Low level cloud: 14%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

5 / 6 kts 67 / 64°F 80%
Low level cloud: 14%
Mid level cloud: 15%
High level cloud: 11%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

2 / 6 kts 52 / 50°F 96%
Low level cloud: 31%
Mid level cloud: 16%
High level cloud: 10%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNE
NNE

2 / 4 kts 48 / 49°F 97%
Low level cloud: 44%
Mid level cloud: 18%
High level cloud: 14%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

1 / 2 kts 47 / 47°F 97%
Low level cloud: 42%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

1 / 1 kts 56 / 54°F 92%
Low level cloud: 35%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

3 / 3 kts 67 / 65°F 75%
Low level cloud: 14%
Mid level cloud: 28%
High level cloud: 19%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

5 / 5 kts 73 / 69°F 67%
Low level cloud: 44%
Mid level cloud: 16%
High level cloud: 14%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

6 / 7 kts 70 / 68°F 72%
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 47%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

5 / 6 kts 66 / 63°F 81%
Low level cloud: 31%
Mid level cloud: 31%
High level cloud: 10%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

3 / 5 kts 54 / 52°F 95%
Low level cloud: 44%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

ESE
ESE

2 / 3 kts 52 / 52°F 94%
Low level cloud: 54%
Mid level cloud: 85%
High level cloud: 9%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

1 / 2 kts 51 / 52°F 96%
Low level cloud: 71%
Mid level cloud: 74%
High level cloud: 16%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

2 / 2 kts 53 / 53°F 94%
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

3 / 4 kts 57 / 56°F 90%
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

4 / 5 kts 56 / 55°F 85%
Low level cloud: 93%
Mid level cloud: 43%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

4 / 5 kts 59 / 58°F 77%
Low level cloud: 75%
Mid level cloud: 32%
High level cloud: 43%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

4 / 5 kts 59 / 56°F 80%
Low level cloud: 50%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

3 / 4 kts 53 / 50°F 90%
Low level cloud: 23%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

ENE
ENE

2 / 3 kts 50 / 50°F 90%
Low level cloud: 61%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

2 / 3 kts 46 / 45°F 92%
Low level cloud: 47%
Mid level cloud: 29%
High level cloud: 35%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

2 / 2 kts 52 / 50°F 88%
Low level cloud: 42%
Mid level cloud: 40%
High level cloud: 21%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

4 / 4 kts 58 / 57°F 76%
Low level cloud: 90%
Mid level cloud: 23%
High level cloud: 8%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

5 / 6 kts 63 / 61°F 68%
Low level cloud: 76%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

6 / 7 kts 64 / 63°F 52%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 77%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

4 / 5 kts 63 / 60°F 61%
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

2 / 5 kts 45 / 43°F 80%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

2 / 6 kts 41 / 40°F 80%
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 16%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

2 / 5 kts 41 / 39°F 83%
Low level cloud: 60%
Mid level cloud: 30%
High level cloud: 13%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

2 / 3 kts 50 / 50°F 71%
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

1 / 2 kts 56 / 57°F 72%
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

2 / 3 kts 59 / 59°F 80%
Low level cloud: 90%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

3 / 4 kts 63 / 61°F 78%
Low level cloud: 72%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

3 / 3 kts 61 / 59°F 89%
Low level cloud: 72%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

3 / 5 kts 55 / 53°F 97%
Low level cloud: 74%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NE
NE

2 / 3 kts 52 / 52°F 97%
Low level cloud: 67%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

1 / 1 kts 51 / 51°F 97%
Low level cloud: 63%
Mid level cloud: 31%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

0 / 1 kts 55 / 54°F 94%
Low level cloud: 68%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

2 / 3 kts 64 / 61°F 78%
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

3 / 4 kts 61 / 60°F 84%
Low level cloud: 64%
Mid level cloud: 100%
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

SSW
SSW

2 / 2 kts 57 / 58°F 94%
Low level cloud: 49%
Mid level cloud: 98%
High level cloud: 93%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WSW
WSW

3 / 5 kts 55 / 54°F 97%
Low level cloud: 37%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

4 / 6 kts 53 / 51°F 98%
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Thu 23
May
00:00

W
W

4 / 6 kts 52 / 50°F 98%
Low level cloud: 51%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

WSW
WSW

3 / 6 kts 50 / 49°F 96%
Low level cloud: 52%
Mid level cloud: 78%
High level cloud: 31%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

WSW
WSW

3 / 5 kts 51 / 50°F 95%
Low level cloud: 68%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

1 / 2 kts 59 / 59°F 85%
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

3 / 4 kts 60 / 59°F 82%
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

4 / 5 kts 63 / 61°F 78%
Low level cloud: 61%
Mid level cloud: 45%
High level cloud: 30%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

5 / 6 kts 57 / 56°F 88%
Low level cloud: 70%
Mid level cloud: 75%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

3 / 4 kts 52 / 51°F 96%
Low level cloud: 85%
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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
00:00

W
W

5 / 10 kts 39 / 35°F 89%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

W
W

4 / 9 kts 48 / 45°F 87%
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

E
E

11 / 17 kts 58 / 55°F 71%
Low level cloud: 83%
Mid level cloud: 1%
High level cloud: 66%
Most Significant Cloud Type: low
91%
0.0 In
18:00

E
E

5 / 9 kts 64 / 64°F 69%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May
00:00

NNE
NNE

4 / 8 kts 46 / 43°F 98%
Low level cloud: 51%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

4 / 8 kts 54 / 53°F 84%
Low level cloud: 23%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
42%
0.0 In
12:00

E
E

10 / 16 kts 65 / 65°F 61%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

SSW
SSW

5 / 11 kts 56 / 54°F 95%
Low level cloud: 96%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sun 26
May
00:00

NNE
NNE

4 / 8 kts 44 / 41°F 90%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

WSW
WSW

4 / 8 kts 52 / 51°F 92%
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
0.0 In
12:00

ENE
ENE

8 / 13 kts 65 / 65°F 57%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SW
SW

4 / 9 kts 63 / 64°F 71%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
0.0 In
Mon 27
May
00:00

NNE
NNE

3 / 6 kts 45 / 43°F 87%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
0.0 In
06:00

SW
SW

5 / 10 kts 51 / 49°F 81%
Low level cloud: 70%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: low
79%
0.0 In
12:00

E
E

5 / 8 kts 66 / 66°F 57%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
0.0 In
18:00

SW
SW

6 / 13 kts 60 / 60°F 86%
Low level cloud: 33%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
Tue 28
May
00:00

NNE
NNE

0 / 1 kts 49 / 49°F 94%
Low level cloud: 51%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
06:00

S
S

2 / 4 kts 48 / 48°F 94%
Low level cloud: 65%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SE
SE

4 / 7 kts 65 / 65°F 71%
Low level cloud: 49%
Mid level cloud: 2%
High level cloud: 22%
Most Significant Cloud Type: low
52%
0.0 In
18:00

W
W

7 / 15 kts 55 / 53°F 66%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
0.1 In
Wed 29
May
00:00

E
E

1 / 3 kts 48 / 49°F 94%
Low level cloud: 28%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
43%
0.0 In
06:00

SW
SW

3 / 6 kts 46 / 44°F 88%
Low level cloud: 65%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
12:00

E
E

5 / 8 kts 66 / 66°F 68%
Low level cloud: 72%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
18:00

WNW
WNW

7 / 16 kts 54 / 51°F 75%
Low level cloud: 5%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: medium
32%
0.1 In
Thu 30
May
00:00

NE
NE

3 / 6 kts 47 / 45°F 97%
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

3 / 7 kts 49 / 47°F 84%
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
58%
0.0 In
12:00

ESE
ESE

5 / 9 kts 67 / 67°F 64%
Low level cloud: 22%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
18:00

SW
SW

8 / 18 kts 57 / 55°F 72%
Low level cloud: 13%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
30%
0.0 In
Fri 31
May
00:00

NNE
NNE

1 / 3 kts 51 / 52°F 85%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

SSE
SSE

4 / 9 kts 49 / 47°F 98%
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SE
SE

4 / 6 kts 71 / 71°F 56%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

WSW
WSW

6 / 13 kts 59 / 58°F 74%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.2 In
Sat 01
Jun
00:00

NE
NE

1 / 3 kts 50 / 51°F 79%
Low level cloud: 3%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: medium
51%
0.0 In
06:00

S
S

3 / 8 kts 50 / 49°F 92%
Low level cloud: 41%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
12:00

ESE
ESE

4 / 7 kts 68 / 68°F 63%
Low level cloud: 26%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
29%
0.0 In
18:00

SSW
SSW

3 / 8 kts 58 / 57°F 77%
Low level cloud: 7%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
0.1 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