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Ballelby 14 Day Long Range Forecast

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

Dumfries and Galloway, United Kingdom

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

Over the next 14 days the Ballelby forecast suggests the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 18°C expected on the afternoon of Saturday 21st. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 26th at 6°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Tuesday 24th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate. Expect the strongest wind on the afternoon of Thursday 26th, coming from a north westerly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 19
Apr
18:00

SSW
SSW

13 / 18 mph 54 / 49°F 91% 1023 mb
Low level cloud: 13%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

12 / 20 mph 51 / 47°F 92% 1024 mb
Low level cloud: 9%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 20
Apr
00:00

SW
SW

11 / 20 mph 50 / 46°F 93% 1024 mb
Low level cloud: 22%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

6 / 13 mph 50 / 47°F 92% 1024 mb
Low level cloud: 43%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WNW
WNW

7 / 14 mph 49 / 46°F 78% 1025 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

7 / 11 mph 51 / 48°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

9 / 12 mph 53 / 49°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

9 / 12 mph 55 / 51°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SW
SW

8 / 12 mph 55 / 51°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

6 / 10 mph 53 / 51°F 74% 1025 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 21
Apr
00:00

S
S

5 / 8 mph 53 / 52°F 74% 1025 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SE
SE

6 / 11 mph 51 / 49°F 74% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

ESE
ESE

10 / 19 mph 48 / 44°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

ESE
ESE

11 / 13 mph 54 / 50°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: medium
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SE
SE

9 / 10 mph 61 / 59°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 35%
Most Significant Cloud Type: medium
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSE
SSE

4 / 4 mph 64 / 62°F 77% 1016 mb
Low level cloud: 28%
Mid level cloud: 21%
High level cloud: 81%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSE
SSE

5 / 6 mph 62 / 60°F 81% 1013 mb
Low level cloud: 20%
Mid level cloud: 16%
High level cloud: 82%
Most Significant Cloud Type: low
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

S
S

9 / 13 mph 55 / 53°F 89% 1012 mb
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 85%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 22
Apr
00:00

SSW
SSW

13 / 26 mph 49 / 44°F 94% 1011 mb
Low level cloud: 29%
Mid level cloud: 28%
High level cloud: 85%
Most Significant Cloud Type: low
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

10 / 21 mph 47 / 42°F 92% 1010 mb
Low level cloud: 13%
Mid level cloud: 73%
High level cloud: 83%
Most Significant Cloud Type: medium
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
06:00

W
W

10 / 20 mph 46 / 41°F 87% 1009 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
36%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

11 / 13 mph 49 / 44°F 94% 1009 mb
Low level cloud: 62%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

SW
SW

13 / 15 mph 53 / 47°F 86% 1009 mb
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

16 / 18 mph 54 / 49°F 83% 1009 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SW
SW

15 / 20 mph 53 / 47°F 82% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

14 / 22 mph 50 / 45°F 82% 1011 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 23
Apr
00:00

WSW
WSW

19 / 29 mph 48 / 41°F 85% 1012 mb
Low level cloud: 7%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

21 / 30 mph 47 / 39°F 87% 1012 mb
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

21 / 32 mph 46 / 38°F 86% 1013 mb
Low level cloud: 21%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

20 / 25 mph 48 / 41°F 84% 1013 mb
Low level cloud: 30%
Mid level cloud: 33%
High level cloud: 84%
Most Significant Cloud Type: low
51%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SW
SW

21 / 24 mph 50 / 43°F 91% 1013 mb
Low level cloud: 91%
Mid level cloud: 77%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
15:00

SW
SW

20 / 34 mph 51 / 44°F 90% 1012 mb
Low level cloud: 29%
Mid level cloud: 83%
High level cloud: 93%
Most Significant Cloud Type: low
69%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

17 / 28 mph 50 / 44°F 88% 1013 mb
Low level cloud: 24%
Mid level cloud: 84%
High level cloud: 78%
Most Significant Cloud Type: medium
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

WSW
WSW

16 / 26 mph 48 / 42°F 89% 1014 mb
Low level cloud: 14%
Mid level cloud: 89%
High level cloud: 77%
Most Significant Cloud Type: medium
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Tue 24
Apr
00:00

WSW
WSW

12 / 14 mph 49 / 44°F 96% 1013 mb
Low level cloud: 69%
Mid level cloud: 92%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.12 In of precipitation over the past 3 hours.
0.12 In
03:00

SW
SW

5 / 7 mph 47 / 45°F 95% 1011 mb
Low level cloud: 79%
Mid level cloud: 80%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
06:00

SSE
SSE

13 / 20 mph 46 / 40°F 94% 1008 mb
Low level cloud: 91%
Mid level cloud: 82%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
09:00

SW
SW

20 / 34 mph 49 / 42°F 96% 1006 mb
Low level cloud: 92%
Mid level cloud: 78%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.23 In of precipitation over the past 3 hours.
0.23 In
12:00

WSW
WSW

14 / 17 mph 52 / 48°F 97% 1006 mb
Low level cloud: 92%
Mid level cloud: 73%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.10 In of precipitation over the past 3 hours.
0.10 In
15:00

WNW
WNW

10 / 12 mph 55 / 51°F 89% 1007 mb
Low level cloud: 30%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

10 / 14 mph 53 / 49°F 84% 1008 mb
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
21:00

WSW
WSW

7 / 11 mph 50 / 47°F 85% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 25
Apr
00:00

W
W

18 / 28 mph 47 / 40°F 86% 1010 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

WSW
WSW

22 / 32 mph 46 / 38°F 85% 1010 mb
Low level cloud: 30%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

23 / 34 mph 46 / 37°F 80% 1010 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

23 / 33 mph 47 / 39°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

22 / 31 mph 48 / 41°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

21 / 32 mph 49 / 42°F 74% 1012 mb
Low level cloud: 30%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

21 / 36 mph 48 / 41°F 74% 1013 mb
Low level cloud: 5%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
59%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

WSW
WSW

20 / 32 mph 47 / 40°F 78% 1015 mb
Low level cloud: 4%
Mid level cloud: 27%
High level cloud: 85%
Most Significant Cloud Type: medium
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 26
Apr
00:00

W
W

23 / 33 mph 46 / 38°F 81% 1008 mb
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
19%
0.03 In
06:00

WSW
WSW

21 / 31 mph 46 / 38°F 78% 1012 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In
12:00

NNW
NNW

15 / 21 mph 48 / 41°F 66% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

NW
NW

9 / 15 mph 50 / 47°F 77% 1019 mb
Low level cloud: 53%
Mid level cloud: 24%
High level cloud: 89%
Most Significant Cloud Type: low
71%
0.03 In
Fri 27
Apr
00:00

W
W

22 / 32 mph 46 / 38°F 78% 1011 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.00 In
06:00

WSW
WSW

17 / 24 mph 45 / 38°F 80% 1011 mb
Low level cloud: 2%
Mid level cloud: 81%
High level cloud: 5%
Most Significant Cloud Type: medium
85%
0.02 In
12:00

SSW
SSW

17 / 19 mph 51 / 46°F 79% 1022 mb
Low level cloud: 50%
Mid level cloud: 87%
High level cloud: 85%
Most Significant Cloud Type: low
90%
0.01 In
18:00

ESE
ESE

5 / 6 mph 46 / 44°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 83%
High level cloud: 20%
Most Significant Cloud Type: medium
84%
0.00 In
Sat 28
Apr
00:00

SW
SW

17 / 24 mph 47 / 40°F 87% 1011 mb
Low level cloud: 18%
Mid level cloud: 79%
High level cloud: 88%
Most Significant Cloud Type: medium
100%
0.02 In
06:00

ENE
ENE

13 / 19 mph 44 / 38°F 89% 1008 mb
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.08 In
12:00

SW
SW

16 / 18 mph 51 / 46°F 80% 1004 mb
Low level cloud: 3%
Mid level cloud: 26%
High level cloud: 41%
Most Significant Cloud Type: medium
34%
0.04 In
18:00

NNW
NNW

25 / 32 mph 46 / 37°F 87% 1008 mb
Low level cloud: 90%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.03 In
Sun 29
Apr
00:00

WNW
WNW

20 / 29 mph 45 / 37°F 78% 1004 mb
Low level cloud: 77%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
90%
0.02 In
06:00

NW
NW

15 / 21 mph 44 / 37°F 84% 1012 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
64%
0.04 In
12:00

WSW
WSW

14 / 16 mph 48 / 43°F 69% 1004 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: medium
18%
0.00 In
18:00

SSW
SSW

19 / 27 mph 48 / 42°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 10%
Most Significant Cloud Type: medium
43%
0.00 In
Mon 30
Apr
00:00

NW
NW

20 / 32 mph 45 / 37°F 76% 1005 mb
Low level cloud: 18%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.03 In
06:00

SSE
SSE

28 / 57 mph 43 / 32°F 83% 997 mb
Low level cloud: 77%
Mid level cloud: 47%
High level cloud: 76%
Most Significant Cloud Type: low
100%
0.07 In
12:00

NW
NW

27 / 39 mph 47 / 38°F 80% 1005 mb
Low level cloud: 51%
Mid level cloud: 27%
High level cloud: 4%
Most Significant Cloud Type: low
60%
0.01 In
18:00

S
S

19 / 22 mph 50 / 44°F 79% 991 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 16%
Most Significant Cloud Type: medium
31%
0.32 In
Tue 01
May
00:00

N
N

31 / 50 mph 45 / 35°F 76% 1011 mb
Low level cloud: 26%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.00 In
06:00

SE
SE

27 / 36 mph 46 / 37°F 78% 988 mb
Low level cloud: 36%
Mid level cloud: 44%
High level cloud: 34%
Most Significant Cloud Type: low
55%
0.00 In
12:00

N
N

18 / 21 mph 48 / 41°F 67% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
0.00 In
18:00

SSE
SSE

26 / 41 mph 51 / 44°F 79% 985 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 54%
Most Significant Cloud Type: medium
11%
0.12 In
Wed 02
May
00:00

NNW
NNW

11 / 16 mph 45 / 40°F 75% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: medium
6%
0.00 In
06:00

SSE
SSE

26 / 49 mph 45 / 36°F 82% 989 mb
Low level cloud: 16%
Mid level cloud: 15%
High level cloud: 51%
Most Significant Cloud Type: low
27%
0.07 In
12:00

SW
SW

13 / 15 mph 47 / 42°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 16%
Most Significant Cloud Type: medium
73%
0.00 In
18:00

SSE
SSE

22 / 45 mph 47 / 39°F 80% 993 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
0.02 In
Thu 03
May
00:00

SW
SW

20 / 41 mph 45 / 37°F 92% 1024 mb
Low level cloud: 85%
Mid level cloud: 62%
High level cloud: 54%
Most Significant Cloud Type: low
100%
0.05 In
06:00

SSE
SSE

24 / 43 mph 47 / 39°F 83% 994 mb
Low level cloud: 15%
Mid level cloud: 31%
High level cloud: 61%
Most Significant Cloud Type: low
33%
0.00 In
12:00

NW
NW

12 / 24 mph 45 / 39°F 79% 1029 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: high
20%
0.07 In
18:00

SW
SW

25 / 48 mph 48 / 41°F 81% 998 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 55%
Most Significant Cloud Type: medium
47%
0.04 In
Fri 04
May
00:00

N
N

8 / 12 mph 49 / 46°F 75% 1034 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 21%
Most Significant Cloud Type: medium
5%
0.00 In
06:00

SW
SW

10 / 14 mph 47 / 42°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: medium
11%
0.07 In
12:00

SSW
SSW

5 / 7 mph 51 / 49°F 70% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: medium
4%
0.00 In
18:00

NE
NE

9 / 15 mph 48 / 44°F 69% 1013 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 35%
Most Significant Cloud Type: medium
17%
0.00 In

Other Locations Near to Ballelby

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