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Penylan 14 Day Long Range Forecast

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

Glamorgan, United Kingdom

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

For Penylan in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the afternoon of Thursday 27th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 25th at 8°C. Expect the coming 14 days to remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Sep
15:00

NW
NW

4 / 5 mph 58 / 57°F 54% 1038 mb
Low level cloud: 20%
Mid level cloud: 23%
High level cloud: 33%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNW
NNW

3 / 4 mph 56 / 56°F 62% 1038 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 15%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

N
N

4 / 6 mph 53 / 52°F 73% 1039 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 25
Sep
00:00

ENE
ENE

5 / 8 mph 49 / 47°F 79% 1038 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

E
E

4 / 8 mph 47 / 45°F 83% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 82%
Most Significant Cloud Type: high
81%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

ESE
ESE

5 / 8 mph 46 / 44°F 82% 1037 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SSE
SSE

5 / 7 mph 53 / 50°F 65% 1037 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: medium
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SSW
SSW

9 / 11 mph 59 / 57°F 60% 1036 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSW
SSW

10 / 13 mph 61 / 61°F 64% 1035 mb
Low level cloud: 14%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSW
SSW

10 / 16 mph 57 / 55°F 75% 1034 mb
Low level cloud: 26%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

11 / 16 mph 55 / 52°F 77% 1035 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 26
Sep
00:00

SSW
SSW

8 / 13 mph 53 / 51°F 77% 1034 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: medium
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SSW
SSW

7 / 11 mph 52 / 50°F 77% 1033 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: medium
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SW
SW

6 / 10 mph 52 / 50°F 76% 1033 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SW
SW

6 / 8 mph 58 / 56°F 66% 1033 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

6 / 7 mph 64 / 62°F 57% 1033 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

5 / 6 mph 65 / 64°F 57% 1032 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

2 / 4 mph 63 / 61°F 68% 1032 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

3 / 5 mph 58 / 58°F 67% 1032 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 27
Sep
00:00

S
S

3 / 6 mph 55 / 55°F 76% 1031 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SE
SE

3 / 5 mph 53 / 54°F 78% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SE
SE

3 / 7 mph 52 / 51°F 77% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SE
SE

4 / 6 mph 58 / 58°F 66% 1029 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
12:00

S
S

6 / 7 mph 66 / 65°F 64% 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

SW
SW

6 / 9 mph 68 / 67°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
18:00

W
W

3 / 6 mph 64 / 63°F 81% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

3 / 5 mph 61 / 60°F 82% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 17%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 28
Sep
00:00

N
N

6 / 12 mph 58 / 56°F 78% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NNE
NNE

10 / 18 mph 54 / 51°F 75% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 35%
Most Significant Cloud Type: high
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

12 / 20 mph 53 / 49°F 78% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

15 / 19 mph 58 / 54°F 82% 1028 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NE
NE

17 / 20 mph 61 / 61°F 76% 1029 mb
Low level cloud: 81%
Mid level cloud: 3%
High level cloud: 15%
Most Significant Cloud Type: low
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ENE
ENE

15 / 19 mph 61 / 60°F 72% 1029 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

ENE
ENE

14 / 21 mph 58 / 55°F 70% 1030 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ENE
ENE

16 / 24 mph 54 / 50°F 70% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 29
Sep
00:00

ENE
ENE

15 / 23 mph 51 / 46°F 75% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

ENE
ENE

14 / 21 mph 50 / 45°F 81% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

ENE
ENE

13 / 19 mph 49 / 44°F 84% 1031 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

E
E

13 / 16 mph 53 / 49°F 76% 1030 mb
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

E
E

12 / 14 mph 59 / 56°F 66% 1029 mb
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

E
E

11 / 14 mph 61 / 60°F 64% 1027 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

E
E

10 / 15 mph 58 / 55°F 70% 1027 mb
Low level cloud: 2%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

ENE
ENE

9 / 14 mph 54 / 51°F 77% 1028 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 13%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 30
Sep
00:00

ENE
ENE

7 / 11 mph 51 / 48°F 80% 1027 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

7 / 11 mph 49 / 46°F 84% 1026 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

9 / 15 mph 47 / 43°F 83% 1026 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 80%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NE
NE

8 / 10 mph 53 / 50°F 72% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NE
NE

6 / 7 mph 59 / 58°F 59% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNE
NNE

6 / 8 mph 62 / 61°F 58% 1027 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 30%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNE
NNE

6 / 11 mph 58 / 56°F 70% 1029 mb
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNE
NNE

10 / 15 mph 54 / 52°F 81% 1030 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 01
Oct
00:00

NW
NW

9 / 13 mph 53 / 49°F 77% 1029 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: low
4%
0.00 In
06:00

NW
NW

17 / 27 mph 48 / 42°F 79% 1013 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.00 In
12:00

NNE
NNE

15 / 18 mph 57 / 53°F 61% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

W
W

19 / 27 mph 60 / 60°F 83% 1023 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.00 In
Tue 02
Oct
00:00

WNW
WNW

9 / 12 mph 52 / 49°F 75% 1032 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 9%
Most Significant Cloud Type: medium
13%
0.00 In
06:00

NW
NW

5 / 9 mph 47 / 45°F 74% 1031 mb
Low level cloud: 14%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
81%
0.00 In
12:00

W
W

9 / 11 mph 64 / 64°F 68% 1031 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.00 In
18:00

N
N

3 / 4 mph 63 / 63°F 84% 1030 mb
Low level cloud: 84%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.00 In
Wed 03
Oct
00:00

WSW
WSW

3 / 3 mph 62 / 62°F 80% 1029 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.00 In
06:00

NE
NE

8 / 13 mph 53 / 50°F 93% 1031 mb
Low level cloud: 41%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.00 In
12:00

SSW
SSW

7 / 8 mph 70 / 70°F 65% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
3%
0.00 In
18:00

N
N

6 / 7 mph 66 / 66°F 83% 1028 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.00 In
Thu 04
Oct
00:00

NW
NW

4 / 5 mph 58 / 58°F 87% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
0.00 In
06:00

NNE
NNE

5 / 6 mph 56 / 55°F 91% 1027 mb
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.00 In
12:00

N
N

5 / 6 mph 62 / 62°F 65% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
0.00 In
18:00

NNE
NNE

9 / 11 mph 59 / 59°F 82% 1028 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.00 In
Fri 05
Oct
00:00

WNW
WNW

6 / 8 mph 56 / 55°F 91% 1029 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: low
9%
0.00 In
06:00

NE
NE

7 / 10 mph 47 / 44°F 83% 1029 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.00 In
12:00

WNW
WNW

17 / 20 mph 61 / 61°F 82% 1027 mb
Low level cloud: 71%
Mid level cloud: 1%
High level cloud: 14%
Most Significant Cloud Type: low
73%
0.00 In
18:00

N
N

5 / 6 mph 65 / 65°F 75% 1027 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.00 In
Sat 06
Oct
00:00

WNW
WNW

13 / 19 mph 55 / 51°F 83% 1028 mb
Low level cloud: 53%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
60%
0.00 In
06:00

NE
NE

5 / 7 mph 55 / 54°F 91% 1027 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.00 In
12:00

NW
NW

13 / 18 mph 56 / 53°F 73% 1029 mb
Low level cloud: 52%
Mid level cloud: 27%
High level cloud: 14%
Most Significant Cloud Type: low
63%
0.00 In
18:00

NNE
NNE

2 / 3 mph 70 / 70°F 84% 1025 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.00 In
Sun 07
Oct
00:00

NW
NW

7 / 11 mph 56 / 54°F 93% 1028 mb
Low level cloud: 45%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.02 In
06:00

E
E

3 / 4 mph 59 / 60°F 87% 1025 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: medium
9%
0.00 In
12:00

SSE
SSE

5 / 6 mph 57 / 56°F 76% 1031 mb
Low level cloud: 69%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
70%
0.00 In
18:00

SSW
SSW

2 / 2 mph 69 / 69°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
Mon 08
Oct
00:00

SSW
SSW

9 / 11 mph 55 / 52°F 92% 1030 mb
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: low
44%
0.00 In
06:00

SE
SE

4 / 6 mph 56 / 56°F 87% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: medium
4%
0.00 In
12:00

S
S

11 / 13 mph 65 / 65°F 76% 1027 mb
Low level cloud: 40%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
42%
0.00 In
18:00

SE
SE

4 / 5 mph 70 / 70°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 7%
Most Significant Cloud Type: medium
21%
0.00 In
Tue 09
Oct
00:00

S
S

11 / 23 mph 49 / 45°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 42%
Most Significant Cloud Type: high
41%
0.00 In
06:00

ENE
ENE

6 / 8 mph 61 / 61°F 95% 1010 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 47%
Most Significant Cloud Type: low
74%
0.19 In
12:00

SSW
SSW

15 / 17 mph 70 / 70°F 62% 1013 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: medium
19%
0.00 In
18:00

WSW
WSW

7 / 11 mph 65 / 65°F 93% 1006 mb
Low level cloud: 44%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.34 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