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Local Weather

Ystrad Mynach 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ystrad Mynach

Caerffili (Caerphilly), United Kingdom

Long range weather outlook for Ystrad Mynach includes 14 day forecast summary:

Reviewing the forecast for Ystrad Mynach Over the next 14 days and the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 25°C expected on the evening of Thursday 28th. The mean minimum temperature will be 13°C, dipping to its lowest on the morning of Saturday 30th at 7°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 24
Jun
15:00

NE
NE

3 / 4 mph 72 / 69°F 57% 1025 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

E
E

2 / 2 mph 72 / 69°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNE
NNE

0 / 0 mph 70 / 68°F 81% 1026 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
Mon 25
Jun
00:00

NNE
NNE

3 / 6 mph 58 / 59°F 84% 1026 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
03:00

NNE
NNE

3 / 7 mph 56 / 56°F 87% 1026 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
06:00

NE
NE

3 / 5 mph 59 / 58°F 82% 1026 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
09:00

E
E

2 / 3 mph 68 / 65°F 68% 1027 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
12:00

E
E

4 / 5 mph 73 / 76°F 59% 1027 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

ESE
ESE

2 / 3 mph 76 / 76°F 56% 1026 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

NNW
NNW

1 / 1 mph 76 / 77°F 65% 1026 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

NNE
NNE

4 / 4 mph 74 / 76°F 83% 1027 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
Tue 26
Jun
00:00

NE
NE

5 / 9 mph 63 / 63°F 86% 1027 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
03:00

NE
NE

5 / 10 mph 59 / 59°F 89% 1026 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
06:00

NE
NE

6 / 11 mph 61 / 59°F 87% 1026 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
09:00

ENE
ENE

9 / 11 mph 68 / 66°F 72% 1027 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
12:00

ENE
ENE

10 / 12 mph 73 / 76°F 60% 1026 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

ENE
ENE

9 / 12 mph 75 / 77°F 57% 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

ENE
ENE

9 / 11 mph 76 / 77°F 71% 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

ENE
ENE

7 / 9 mph 72 / 70°F 87% 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
Wed 27
Jun
00:00

E
E

4 / 5 mph 63 / 64°F 92% 1026 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
03:00

ENE
ENE

5 / 8 mph 58 / 58°F 93% 1026 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
06:00

ENE
ENE

9 / 14 mph 57 / 54°F 86% 1026 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
09:00

ENE
ENE

11 / 14 mph 64 / 63°F 70% 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
12:00

ENE
ENE

13 / 15 mph 71 / 70°F 61% 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

ENE
ENE

13 / 17 mph 74 / 76°F 58% 1024 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

ENE
ENE

10 / 12 mph 74 / 76°F 70% 1023 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

NE
NE

11 / 18 mph 67 / 66°F 83% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 28
Jun
00:00

NE
NE

10 / 17 mph 59 / 59°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

8 / 16 mph 53 / 51°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

9 / 16 mph 55 / 51°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

9 / 11 mph 65 / 63°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

ENE
ENE

9 / 11 mph 73 / 76°F 57% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 51%
Most Significant Cloud Type: high
51%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ENE
ENE

8 / 11 mph 76 / 77°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NE
NE

6 / 9 mph 77 / 78°F 68% 1022 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

NNE
NNE

6 / 9 mph 73 / 70°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 29
Jun
00:00

NNE
NNE

6 / 12 mph 64 / 64°F 84% 1022 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
03:00

NNE
NNE

6 / 12 mph 61 / 61°F 87% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

7 / 13 mph 61 / 59°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 31%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

ENE
ENE

10 / 13 mph 66 / 65°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 20%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

ENE
ENE

11 / 13 mph 72 / 76°F 70% 1022 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ENE
ENE

12 / 14 mph 73 / 76°F 71% 1021 mb
Low level cloud: 48%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

ENE
ENE

12 / 15 mph 69 / 68°F 76% 1020 mb
Low level cloud: 34%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ENE
ENE

9 / 15 mph 62 / 61°F 86% 1021 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 30
Jun
00:00

ENE
ENE

8 / 11 mph 54 / 51°F 92% 1022 mb
Low level cloud: 6%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

ENE
ENE

6 / 8 mph 50 / 48°F 92% 1022 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

5 / 7 mph 50 / 47°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

5 / 6 mph 59 / 57°F 61% 1021 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
12:00

NNE
NNE

5 / 6 mph 68 / 66°F 51% 1021 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

N
N

3 / 4 mph 72 / 69°F 51% 1020 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

W
W

5 / 6 mph 70 / 67°F 69% 1020 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

5 / 10 mph 62 / 60°F 90% 1021 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 01
Jul
00:00

NE
NE

8 / 14 mph 68 / 69°F 86% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
06:00

NE
NE

10 / 17 mph 62 / 62°F 86% 1018 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 89%
Most Significant Cloud Type: medium
15%
0.00 In
12:00

NNE
NNE

6 / 6 mph 76 / 79°F 69% 1015 mb
Low level cloud: 29%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
33%
0.01 In
18:00

WSW
WSW

4 / 5 mph 65 / 65°F 80% 1012 mb
Low level cloud: 19%
Mid level cloud: 30%
High level cloud: 68%
Most Significant Cloud Type: low
37%
0.02 In
Mon 02
Jul
00:00

NE
NE

10 / 17 mph 61 / 61°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 32%
Most Significant Cloud Type: medium
73%
0.00 In
06:00

ENE
ENE

10 / 15 mph 52 / 48°F 83% 1027 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
14%
0.00 In
12:00

W
W

9 / 10 mph 70 / 70°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 53%
Most Significant Cloud Type: medium
19%
0.00 In
18:00

WSW
WSW

5 / 6 mph 75 / 78°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.02 In
Tue 03
Jul
00:00

NW
NW

7 / 12 mph 58 / 56°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 83%
Most Significant Cloud Type: medium
7%
0.00 In
06:00

SSE
SSE

3 / 3 mph 63 / 63°F 90% 1022 mb
Low level cloud: 28%
Mid level cloud: 34%
High level cloud: 2%
Most Significant Cloud Type: low
40%
0.00 In
12:00

WNW
WNW

10 / 11 mph 66 / 66°F 64% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 13%
Most Significant Cloud Type: medium
10%
0.00 In
18:00

NW
NW

5 / 7 mph 70 / 69°F 78% 1019 mb
Low level cloud: 28%
Mid level cloud: 29%
High level cloud: 10%
Most Significant Cloud Type: low
39%
0.04 In
Wed 04
Jul
00:00

NW
NW

7 / 11 mph 57 / 56°F 95% 1021 mb
Low level cloud: 29%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
45%
0.00 In
06:00

ENE
ENE

6 / 8 mph 60 / 60°F 92% 1018 mb
Low level cloud: 7%
Mid level cloud: 19%
High level cloud: 91%
Most Significant Cloud Type: medium
42%
0.00 In
12:00

NW
NW

6 / 10 mph 66 / 66°F 77% 1024 mb
Low level cloud: 69%
Mid level cloud: 41%
High level cloud: 7%
Most Significant Cloud Type: low
84%
0.01 In
18:00

ENE
ENE

7 / 10 mph 72 / 76°F 69% 1015 mb
Low level cloud: 3%
Mid level cloud: 21%
High level cloud: 36%
Most Significant Cloud Type: medium
31%
0.02 In
Thu 05
Jul
00:00

NNW
NNW

5 / 8 mph 63 / 63°F 95% 1025 mb
Low level cloud: 47%
Mid level cloud: 32%
High level cloud: 13%
Most Significant Cloud Type: low
60%
0.01 In
06:00

ENE
ENE

5 / 7 mph 58 / 57°F 87% 1016 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 40%
Most Significant Cloud Type: medium
26%
0.01 In
12:00

W
W

4 / 6 mph 68 / 68°F 77% 1025 mb
Low level cloud: 63%
Mid level cloud: 49%
High level cloud: 17%
Most Significant Cloud Type: low
81%
0.00 In
18:00

W
W

10 / 16 mph 66 / 66°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 16%
Most Significant Cloud Type: medium
13%
0.01 In
Fri 06
Jul
00:00

WNW
WNW

6 / 8 mph 63 / 64°F 94% 1024 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
13%
0.00 In
06:00

SW
SW

6 / 8 mph 58 / 57°F 95% 1016 mb
Low level cloud: 56%
Mid level cloud: 51%
High level cloud: 50%
Most Significant Cloud Type: low
80%
0.01 In
12:00

W
W

9 / 15 mph 68 / 68°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.00 In
18:00

NW
NW

15 / 21 mph 60 / 60°F 78% 1018 mb
Low level cloud: 41%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.15 In
Sat 07
Jul
00:00

W
W

7 / 11 mph 57 / 55°F 96% 1022 mb
Low level cloud: 41%
Mid level cloud: 20%
High level cloud: 46%
Most Significant Cloud Type: low
53%
0.00 In
06:00

NW
NW

15 / 19 mph 50 / 45°F 78% 1022 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.00 In
12:00

WSW
WSW

15 / 22 mph 62 / 62°F 89% 1018 mb
Low level cloud: 64%
Mid level cloud: 47%
High level cloud: 2%
Most Significant Cloud Type: low
80%
0.08 In
18:00

NNW
NNW

12 / 17 mph 57 / 55°F 79% 1024 mb
Low level cloud: 73%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.01 In
Sun 08
Jul
00:00

WNW
WNW

8 / 13 mph 56 / 54°F 97% 1017 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.07 In
06:00

N
N

6 / 8 mph 53 / 52°F 91% 1028 mb
Low level cloud: 43%
Mid level cloud: 41%
High level cloud: 5%
Most Significant Cloud Type: low
58%
0.01 In
12:00

NW
NW

10 / 15 mph 57 / 55°F 73% 1020 mb
Low level cloud: 64%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
65%
0.00 In
18:00

N
N

5 / 8 mph 63 / 63°F 77% 1028 mb
Low level cloud: 44%
Mid level cloud: 32%
High level cloud: 1%
Most Significant Cloud Type: low
55%
0.01 In
Mon 09
Jul
00:00

NW
NW

8 / 12 mph 54 / 51°F 90% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
0.00 In
06:00

NNE
NNE

5 / 6 mph 56 / 55°F 87% 1030 mb
Low level cloud: 4%
Mid level cloud: 41%
High level cloud: 2%
Most Significant Cloud Type: medium
51%
0.00 In
12:00

WNW
WNW

12 / 15 mph 64 / 64°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.00 In
18:00

N
N

8 / 12 mph 70 / 70°F 70% 1028 mb
Low level cloud: 40%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
46%
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