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Canna 14 Day Long Range Forecast

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

Highland, United Kingdom

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

Reviewing the forecast for Canna Over the next 14 days and the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 23°C expected on the afternoon of Tuesday 28th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Friday 24th at 8°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 22.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 19
May
00:00

WNW
WNW

3 / 6 mph 50 / 50°F 94%
Low level cloud: 76%
Mid level cloud: 45%
High level cloud: 65%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

3 / 5 mph 51 / 50°F 95%
Low level cloud: 93%
Mid level cloud: 28%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

3 / 4 mph 52 / 52°F 91%
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

3 / 4 mph 56 / 56°F 79%
Low level cloud: 92%
Mid level cloud: 89%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

3 / 4 mph 57 / 57°F 76%
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

4 / 4 mph 62 / 60°F 71%
Low level cloud: 21%
Mid level cloud: 29%
High level cloud: 31%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

4 / 6 mph 59 / 58°F 75%
Low level cloud: 11%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

4 / 7 mph 52 / 49°F 91%
Low level cloud: 3%
Mid level cloud: 25%
High level cloud: 12%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

ENE
ENE

3 / 6 mph 48 / 48°F 91%
Low level cloud: 10%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

2 / 4 mph 48 / 49°F 91%
Low level cloud: 21%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

4 / 7 mph 52 / 50°F 87%
Low level cloud: 51%
Mid level cloud: 68%
High level cloud: 56%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

6 / 7 mph 63 / 60°F 78%
Low level cloud: 47%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

5 / 6 mph 66 / 63°F 71%
Low level cloud: 31%
Mid level cloud: 22%
High level cloud: 19%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

3 / 4 mph 67 / 64°F 71%
Low level cloud: 17%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

1 / 1 mph 65 / 62°F 76%
Low level cloud: 26%
Mid level cloud: 23%
High level cloud: 18%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

2 / 5 mph 55 / 54°F 91%
Low level cloud: 46%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NE
NE

3 / 7 mph 53 / 53°F 88%
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

2 / 4 mph 53 / 54°F 86%
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

1 / 1 mph 56 / 54°F 86%
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 31%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

1 / 1 mph 64 / 61°F 79%
Low level cloud: 44%
Mid level cloud: 29%
High level cloud: 28%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

2 / 2 mph 68 / 65°F 73%
Low level cloud: 39%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

6 / 8 mph 66 / 63°F 76%
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 48%
Most Significant Cloud Type: medium
39%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

3 / 5 mph 58 / 57°F 85%
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

S
S

1 / 1 mph 54 / 52°F 95%
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May
00:00

SSE
SSE

2 / 4 mph 53 / 54°F 96%
Low level cloud: 15%
Mid level cloud: 43%
High level cloud: 9%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

1 / 1 mph 51 / 51°F 95%
Low level cloud: 9%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 6 mph 50 / 49°F 92%
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

3 / 6 mph 53 / 53°F 85%
Low level cloud: 6%
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
12:00

NE
NE

2 / 2 mph 57 / 57°F 87%
Low level cloud: 33%
Mid level cloud: 98%
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

NNE
NNE

5 / 6 mph 61 / 59°F 92%
Low level cloud: 49%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

9 / 11 mph 57 / 55°F 96%
Low level cloud: 65%
Mid level cloud: 89%
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

N
N

11 / 13 mph 54 / 51°F 96%
Low level cloud: 73%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May
00:00

N
N

16 / 18 mph 52 / 47°F 96%
Low level cloud: 95%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

N
N

18 / 25 mph 50 / 44°F 96%
Low level cloud: 96%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
06:00

N
N

21 / 33 mph 49 / 42°F 96%
Low level cloud: 98%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

NNE
NNE

22 / 27 mph 53 / 47°F 96%
Low level cloud: 95%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

NNE
NNE

13 / 15 mph 57 / 53°F 95%
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

12 / 13 mph 58 / 56°F 93%
Low level cloud: 77%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

9 / 10 mph 57 / 54°F 92%
Low level cloud: 63%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

5 / 8 mph 54 / 52°F 96%
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

E
E

2 / 5 mph 50 / 50°F 94%
Low level cloud: 68%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

2 / 5 mph 48 / 49°F 94%
Low level cloud: 45%
Mid level cloud: 49%
High level cloud: 2%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

6 / 12 mph 47 / 45°F 95%
Low level cloud: 84%
Mid level cloud: 46%
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

SSE
SSE

10 / 19 mph 51 / 47°F 84%
Low level cloud: 91%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

13 / 15 mph 54 / 50°F 89%
Low level cloud: 90%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

19 / 21 mph 56 / 51°F 93%
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

17 / 20 mph 54 / 49°F 93%
Low level cloud: 91%
Mid level cloud: 59%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

12 / 14 mph 51 / 47°F 91%
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

SSE
SSE

8 / 12 mph 48 / 45°F 91%
Low level cloud: 10%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

6 / 11 mph 47 / 44°F 89%
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

6 / 9 mph 50 / 47°F 81%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

8 / 13 mph 54 / 51°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
12:00

SSE
SSE

10 / 15 mph 57 / 53°F 58%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 37%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

9 / 15 mph 58 / 54°F 59%
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
18:00

S
S

6 / 10 mph 56 / 53°F 66%
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 47%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 7 mph 54 / 52°F 77%
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 26
May
00:00

ENE
ENE

4 / 8 mph 53 / 52°F 73%
Low level cloud: 45%
Mid level cloud: 50%
High level cloud: 33%
Most Significant Cloud Type: low
66%
0.0 In
06:00

SSE
SSE

10 / 16 mph 52 / 48°F 92%
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

1 / 2 mph 58 / 58°F 64%
Low level cloud: 10%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
0.0 In
18:00

NNE
NNE

8 / 10 mph 62 / 62°F 73%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
Mon 27
May
00:00

ENE
ENE

5 / 9 mph 53 / 52°F 95%
Low level cloud: 35%
Mid level cloud: 54%
High level cloud: 19%
Most Significant Cloud Type: low
55%
0.0 In
06:00

NE
NE

1 / 2 mph 58 / 58°F 76%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

S
S

7 / 12 mph 57 / 56°F 78%
Low level cloud: 52%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
71%
0.0 In
18:00

N
N

7 / 14 mph 64 / 64°F 64%
Low level cloud: 2%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Tue 28
May
00:00

NNE
NNE

3 / 6 mph 52 / 51°F 88%
Low level cloud: 32%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
06:00

ENE
ENE

2 / 5 mph 58 / 59°F 79%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

SW
SW

4 / 8 mph 55 / 55°F 79%
Low level cloud: 35%
Mid level cloud: 47%
High level cloud: 3%
Most Significant Cloud Type: low
51%
0.1 In
18:00

NNE
NNE

6 / 13 mph 64 / 64°F 60%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
Wed 29
May
00:00

S
S

3 / 6 mph 50 / 50°F 94%
Low level cloud: 49%
Mid level cloud: 48%
High level cloud: 44%
Most Significant Cloud Type: low
71%
0.3 In
06:00

NE
NE

5 / 11 mph 55 / 53°F 77%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

WNW
WNW

3 / 6 mph 54 / 54°F 73%
Low level cloud: 3%
Mid level cloud: 31%
High level cloud: 14%
Most Significant Cloud Type: medium
39%
0.1 In
18:00

N
N

12 / 25 mph 57 / 54°F 73%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 30
May
00:00

N
N

5 / 10 mph 46 / 44°F 93%
Low level cloud: 17%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.1 In
06:00

NE
NE

10 / 21 mph 50 / 46°F 84%
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
12:00

NNE
NNE

5 / 10 mph 53 / 52°F 68%
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 10%
Most Significant Cloud Type: low
22%
0.0 In
18:00

NE
NE

17 / 35 mph 52 / 46°F 63%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 31
May
00:00

NNE
NNE

6 / 12 mph 44 / 41°F 87%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

NE
NE

10 / 21 mph 45 / 40°F 68%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
20%
0.0 In
12:00

NNE
NNE

5 / 11 mph 54 / 53°F 59%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

NNE
NNE

13 / 26 mph 49 / 44°F 65%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: medium
23%
0.0 In
Sat 01
Jun
00:00

E
E

3 / 6 mph 50 / 49°F 83%
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 71%
Most Significant Cloud Type: low
95%
0.0 In
06:00

N
N

6 / 13 mph 46 / 43°F 77%
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 2%
Most Significant Cloud Type: medium
72%
0.0 In
12:00

ENE
ENE

5 / 10 mph 54 / 53°F 86%
Low level cloud: 98%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

7 / 14 mph 52 / 49°F 76%
Low level cloud: 64%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
81%
0.0 In
Sun 02
Jun
00:00

ESE
ESE

5 / 11 mph 51 / 50°F 96%
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 76%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NW
NW

3 / 6 mph 48 / 47°F 85%
Low level cloud: 96%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
12:00

S
S

14 / 29 mph 57 / 54°F 94%
Low level cloud: 96%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
18:00

NW
NW

3 / 7 mph 52 / 52°F 73%
Low level cloud: 83%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
Mon 03
Jun
00:00

S
S

13 / 28 mph 52 / 47°F 94%
Low level cloud: 83%
Mid level cloud: 82%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

2 / 5 mph 49 / 50°F 77%
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
80%
0.0 In
12:00

SSW
SSW

20 / 41 mph 54 / 49°F 92%
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.5 In
18:00

NNW
NNW

2 / 3 mph 53 / 53°F 61%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: high
31%
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