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Ton-y-pistyll 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ton-y-pistyll

Caerffili (Caerphilly), United Kingdom

Long range weather outlook for Ton-y-pistyll includes 14 day forecast summary:

The outlook for Ton-y-pistyll in the two weeks ahead shows the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 14°C expected on the afternoon of Wednesday 2nd. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Saturday 28th at 3°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Predictions are Friday 27th will have the most precipitation with an accumulation of around 23.0mm. On the whole winds are likely to be moderate. The strongest wind will be felt on the afternoon of Monday 30th, coming from a north easterly direction, and reaching around 35mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 25
Apr
18:00

W
W

20 / 29 mph 48 / 41°F 76% 1012 mb
Low level cloud: 12%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

16 / 26 mph 44 / 37°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 26
Apr
00:00

W
W

14 / 25 mph 43 / 35°F 83% 1015 mb
Low level cloud: 6%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

13 / 22 mph 41 / 34°F 87% 1015 mb
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

12 / 19 mph 42 / 35°F 86% 1017 mb
Low level cloud: 38%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

16 / 19 mph 48 / 41°F 74% 1017 mb
Low level cloud: 35%
Mid level cloud: 12%
High level cloud: 87%
Most Significant Cloud Type: low
49%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

18 / 22 mph 51 / 45°F 68% 1017 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: low
18%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
15:00

WSW
WSW

17 / 20 mph 51 / 45°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 80%
Most Significant Cloud Type: medium
34%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

12 / 17 mph 48 / 42°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 90%
Most Significant Cloud Type: medium
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

5 / 8 mph 44 / 41°F 85% 1014 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 92%
Most Significant Cloud Type: medium
89%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 27
Apr
00:00

SSE
SSE

4 / 6 mph 43 / 40°F 94% 1012 mb
Low level cloud: 90%
Mid level cloud: 86%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
03:00

ESE
ESE

8 / 11 mph 42 / 37°F 97% 1008 mb
Low level cloud: 91%
Mid level cloud: 88%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
06:00

ENE
ENE

14 / 20 mph 40 / 33°F 97% 1003 mb
Low level cloud: 96%
Mid level cloud: 89%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.24 In of precipitation over the past 3 hours.
0.24 In
09:00

NE
NE

19 / 28 mph 41 / 32°F 96% 1001 mb
Low level cloud: 95%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.27 In of precipitation over the past 3 hours.
0.27 In
12:00

NNE
NNE

22 / 31 mph 42 / 32°F 93% 1003 mb
Low level cloud: 91%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.17 In of precipitation over the past 3 hours.
0.17 In
15:00

N
N

19 / 23 mph 47 / 40°F 82% 1006 mb
Low level cloud: 63%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
18:00

NNW
NNW

10 / 15 mph 48 / 42°F 79% 1010 mb
Low level cloud: 11%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

WNW
WNW

9 / 16 mph 41 / 36°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 35%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 28
Apr
00:00

WNW
WNW

6 / 12 mph 39 / 34°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 97%
Most Significant Cloud Type: medium
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WNW
WNW

2 / 3 mph 37 / 37°F 81% 1015 mb
Low level cloud: 2%
Mid level cloud: 83%
High level cloud: 7%
Most Significant Cloud Type: medium
89%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

S
S

3 / 5 mph 41 / 38°F 84% 1016 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SSW
SSW

5 / 6 mph 48 / 45°F 76% 1017 mb
Low level cloud: 19%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

WSW
WSW

8 / 11 mph 52 / 48°F 68% 1016 mb
Low level cloud: 2%
Mid level cloud: 40%
High level cloud: 6%
Most Significant Cloud Type: medium
45%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
15:00

WSW
WSW

8 / 10 mph 53 / 49°F 63% 1015 mb
Low level cloud: 9%
Mid level cloud: 22%
High level cloud: 31%
Most Significant Cloud Type: low
20%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
18:00

W
W

5 / 6 mph 52 / 49°F 75% 1014 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 80%
Most Significant Cloud Type: medium
32%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

NW
NW

3 / 7 mph 43 / 42°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 65%
High level cloud: 85%
Most Significant Cloud Type: medium
68%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 29
Apr
00:00

N
N

5 / 10 mph 40 / 36°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 86%
Most Significant Cloud Type: medium
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NNE
NNE

6 / 13 mph 38 / 33°F 93% 1013 mb
Low level cloud: 10%
Mid level cloud: 85%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

7 / 12 mph 39 / 34°F 92% 1012 mb
Low level cloud: 26%
Mid level cloud: 76%
High level cloud: 35%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

10 / 12 mph 47 / 43°F 82% 1012 mb
Low level cloud: 20%
Mid level cloud: 86%
High level cloud: 82%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

ENE
ENE

12 / 16 mph 49 / 44°F 72% 1011 mb
Low level cloud: 11%
Mid level cloud: 91%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
15:00

ENE
ENE

13 / 19 mph 46 / 40°F 82% 1010 mb
Low level cloud: 31%
Mid level cloud: 74%
High level cloud: 85%
Most Significant Cloud Type: low
67%
Expect 0.07 In of precipitation over the past 3 hours.
0.07 In
18:00

NE
NE

16 / 24 mph 44 / 36°F 84% 1010 mb
Low level cloud: 1%
Mid level cloud: 73%
High level cloud: 79%
Most Significant Cloud Type: medium
78%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
21:00

NE
NE

19 / 30 mph 40 / 31°F 84% 1011 mb
Low level cloud: 45%
Mid level cloud: 75%
High level cloud: 33%
Most Significant Cloud Type: low
75%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Mon 30
Apr
00:00

NNE
NNE

22 / 33 mph 40 / 30°F 86% 1009 mb
Low level cloud: 73%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

NNE
NNE

22 / 34 mph 39 / 29°F 88% 1008 mb
Low level cloud: 64%
Mid level cloud: 88%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
06:00

NNE
NNE

26 / 40 mph 38 / 27°F 89% 1006 mb
Low level cloud: 81%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
09:00

NNE
NNE

31 / 44 mph 40 / 29°F 88% 1004 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
12:00

NNE
NNE

35 / 40 mph 42 / 31°F 89% 1003 mb
Low level cloud: 93%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
15:00

NNE
NNE

29 / 34 mph 43 / 33°F 90% 1003 mb
Low level cloud: 91%
Mid level cloud: 84%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
18:00

NNE
NNE

25 / 28 mph 42 / 33°F 92% 1004 mb
Low level cloud: 87%
Mid level cloud: 91%
High level cloud: 52%
Most Significant Cloud Type: low
100%
Expect 0.11 In of precipitation over the past 3 hours.
0.11 In
21:00

NNE
NNE

20 / 26 mph 41 / 32°F 93% 1005 mb
Low level cloud: 92%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
Tue 01
May
00:00

NE
NE

14 / 20 mph 41 / 33°F 95% 1005 mb
Low level cloud: 85%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

NE
NE

10 / 16 mph 41 / 35°F 97% 1004 mb
Low level cloud: 71%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
06:00

NE
NE

10 / 14 mph 41 / 34°F 96% 1005 mb
Low level cloud: 76%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

ENE
ENE

11 / 13 mph 47 / 41°F 88% 1006 mb
Low level cloud: 81%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

E
E

11 / 15 mph 51 / 46°F 81% 1007 mb
Low level cloud: 56%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
15:00

ESE
ESE

9 / 11 mph 53 / 49°F 79% 1007 mb
Low level cloud: 43%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
18:00

E
E

7 / 9 mph 53 / 49°F 84% 1007 mb
Low level cloud: 7%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

NE
NE

7 / 14 mph 45 / 41°F 92% 1009 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 02
May
00:00

WNW
WNW

6 / 12 mph 41 / 37°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
20%
0.00 In
06:00

SW
SW

13 / 26 mph 42 / 35°F 85% 1003 mb
Low level cloud: 10%
Mid level cloud: 81%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
0.00 In
12:00

ESE
ESE

8 / 9 mph 57 / 55°F 78% 1009 mb
Low level cloud: 64%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.02 In
18:00

SE
SE

9 / 12 mph 50 / 46°F 94% 996 mb
Low level cloud: 91%
Mid level cloud: 78%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.06 In
Thu 03
May
00:00

NW
NW

9 / 15 mph 40 / 34°F 87% 1009 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 22%
Most Significant Cloud Type: medium
25%
0.00 In
06:00

W
W

13 / 21 mph 42 / 35°F 83% 991 mb
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.04 In
12:00

W
W

6 / 7 mph 53 / 51°F 90% 1005 mb
Low level cloud: 62%
Mid level cloud: 67%
High level cloud: 22%
Most Significant Cloud Type: low
88%
0.01 In
18:00

WSW
WSW

11 / 12 mph 53 / 50°F 83% 1003 mb
Low level cloud: 33%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
36%
0.01 In
Fri 04
May
00:00

NW
NW

9 / 16 mph 42 / 37°F 92% 1007 mb
Low level cloud: 46%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.00 In
06:00

SSE
SSE

4 / 5 mph 46 / 44°F 95% 1004 mb
Low level cloud: 55%
Mid level cloud: 81%
High level cloud: 90%
Most Significant Cloud Type: low
94%
0.01 In
12:00

WNW
WNW

13 / 17 mph 50 / 46°F 65% 1012 mb
Low level cloud: 66%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
75%
0.00 In
18:00

WSW
WSW

13 / 20 mph 50 / 45°F 89% 1005 mb
Low level cloud: 42%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.09 In
Sat 05
May
00:00

WSW
WSW

10 / 17 mph 44 / 38°F 88% 1014 mb
Low level cloud: 22%
Mid level cloud: 89%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
0.01 In
06:00

WNW
WNW

6 / 8 mph 47 / 43°F 93% 1012 mb
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.00 In
12:00

WSW
WSW

16 / 27 mph 51 / 46°F 95% 1011 mb
Low level cloud: 89%
Mid level cloud: 66%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.19 In
18:00

W
W

12 / 21 mph 49 / 44°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: medium
4%
0.01 In
Sun 06
May
00:00

WSW
WSW

12 / 23 mph 51 / 46°F 96% 1015 mb
Low level cloud: 74%
Mid level cloud: 27%
High level cloud: 43%
Most Significant Cloud Type: low
88%
0.03 In
06:00

SSW
SSW

6 / 8 mph 45 / 41°F 94% 1021 mb
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 17%
Most Significant Cloud Type: low
25%
0.00 In
12:00

WSW
WSW

12 / 21 mph 54 / 51°F 92% 1020 mb
Low level cloud: 83%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.03 In
18:00

SSW
SSW

10 / 16 mph 53 / 50°F 85% 1019 mb
Low level cloud: 63%
Mid level cloud: 27%
High level cloud: 20%
Most Significant Cloud Type: low
75%
0.01 In
Mon 07
May
00:00

WSW
WSW

6 / 8 mph 53 / 52°F 97% 1022 mb
Low level cloud: 65%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.01 In
06:00

S
S

16 / 25 mph 51 / 46°F 94% 1017 mb
Low level cloud: 78%
Mid level cloud: 55%
High level cloud: 56%
Most Significant Cloud Type: low
100%
0.04 In
12:00

WSW
WSW

2 / 2 mph 59 / 58°F 82% 1025 mb
Low level cloud: 68%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.01 In
18:00

SW
SW

9 / 14 mph 52 / 49°F 91% 1016 mb
Low level cloud: 66%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.28 In
Tue 08
May
00:00

NE
NE

6 / 10 mph 55 / 53°F 94% 1023 mb
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
37%
0.01 In
06:00

W
W

3 / 3 mph 48 / 48°F 92% 1019 mb
Low level cloud: 13%
Mid level cloud: 26%
High level cloud: 40%
Most Significant Cloud Type: low
26%
0.00 In
12:00

ENE
ENE

14 / 20 mph 61 / 61°F 84% 1022 mb
Low level cloud: 62%
Mid level cloud: 11%
High level cloud: 15%
Most Significant Cloud Type: low
67%
0.01 In
18:00

WNW
WNW

8 / 9 mph 52 / 49°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 38%
Most Significant Cloud Type: medium
24%
0.01 In
Wed 09
May
00:00

ENE
ENE

16 / 24 mph 53 / 49°F 90% 1023 mb
Low level cloud: 52%
Mid level cloud: 20%
High level cloud: 45%
Most Significant Cloud Type: low
64%
0.02 In
06:00

N
N

7 / 9 mph 45 / 42°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
0.00 In
12:00

ENE
ENE

18 / 27 mph 57 / 53°F 80% 1025 mb
Low level cloud: 44%
Mid level cloud: 32%
High level cloud: 59%
Most Significant Cloud Type: low
62%
0.01 In
18:00

NE
NE

13 / 23 mph 52 / 48°F 84% 1024 mb
Low level cloud: 72%
Mid level cloud: 28%
High level cloud: 15%
Most Significant Cloud Type: low
83%
0.01 In
Thu 10
May
00:00

ENE
ENE

15 / 23 mph 43 / 36°F 76% 1027 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.00 In
06:00

NE
NE

12 / 20 mph 45 / 39°F 90% 1026 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
16%
0.00 In
12:00

ENE
ENE

19 / 27 mph 54 / 48°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
0.00 In
18:00

ENE
ENE

8 / 11 mph 63 / 63°F 84% 1023 mb
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.00 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