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The Green 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for The Green

Barnsley, United Kingdom

Long range weather outlook for The Green includes 14 day forecast summary:

The forecast for The Green in the coming two weeks is predicting the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 21°C expected on the afternoon of Monday 12th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Wednesday 14th at 5°C. The coming 14 days will have mostly dry days although Monday is likely to see a little rain. The indicators are that Monday 12th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 10
May
15:00

SSE
SSE

8 / 11 mph 65 / 63°F 44% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

8 / 11 mph 63 / 61°F 60% 1017 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 3%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 6 mph 54 / 54°F 83% 1018 mb
Low level cloud: 10%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 11
May
00:00

ESE
ESE

3 / 5 mph 52 / 51°F 88% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

3 / 5 mph 49 / 48°F 88% 1017 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

3 / 4 mph 48 / 47°F 85% 1016 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 12%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

6 / 7 mph 58 / 56°F 63% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 44%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

10 / 11 mph 67 / 66°F 41% 1013 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

10 / 12 mph 69 / 67°F 40% 1011 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 36%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

10 / 14 mph 65 / 63°F 56% 1011 mb
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 62%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

4 / 6 mph 56 / 56°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 38%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
May
00:00

NE
NE

4 / 6 mph 52 / 51°F 87% 1012 mb
Low level cloud: 6%
Mid level cloud: 31%
High level cloud: 24%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

3 / 5 mph 50 / 49°F 93% 1011 mb
Low level cloud: 16%
Mid level cloud: 42%
High level cloud: 42%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 6 mph 52 / 50°F 88% 1012 mb
Low level cloud: 16%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

7 / 8 mph 63 / 60°F 64% 1012 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 10%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

12 / 14 mph 70 / 69°F 47% 1012 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 6%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

13 / 16 mph 68 / 66°F 60% 1013 mb
Low level cloud: 58%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

12 / 15 mph 63 / 62°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

7 / 9 mph 54 / 52°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May
00:00

NE
NE

6 / 7 mph 49 / 46°F 88% 1019 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 8 mph 45 / 43°F 90% 1020 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

6 / 9 mph 46 / 42°F 84% 1021 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

11 / 13 mph 58 / 54°F 61% 1021 mb
Low level cloud: 1%
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

E
E

13 / 15 mph 65 / 64°F 44% 1021 mb
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
15:00

E
E

13 / 15 mph 65 / 64°F 43% 1021 mb
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
18:00

E
E

11 / 13 mph 63 / 62°F 53% 1022 mb
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
21:00

ENE
ENE

6 / 8 mph 53 / 50°F 77% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May
00:00

NE
NE

4 / 5 mph 49 / 48°F 85% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 6 mph 45 / 43°F 88% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

4 / 6 mph 46 / 44°F 74% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 48%
Most Significant Cloud Type: high
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

6 / 7 mph 56 / 53°F 48% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

8 / 9 mph 64 / 62°F 41% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 47%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

8 / 9 mph 67 / 65°F 40% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 21%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

8 / 9 mph 66 / 64°F 50% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

4 / 4 mph 58 / 57°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May
00:00

N
N

3 / 5 mph 48 / 47°F 68% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

4 / 6 mph 47 / 46°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 64%
Most Significant Cloud Type: high
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

4 / 7 mph 48 / 47°F 60% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

8 / 9 mph 59 / 56°F 36% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

9 / 10 mph 65 / 64°F 33% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

10 / 12 mph 67 / 65°F 33% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 12 mph 64 / 63°F 45% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

6 / 7 mph 58 / 56°F 76% 1026 mb
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
Fri 16
May
00:00

NNE
NNE

7 / 11 mph 46 / 42°F 90% 1026 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

7 / 11 mph 48 / 44°F 80% 1026 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

7 / 10 mph 49 / 45°F 85% 1027 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

8 / 9 mph 58 / 55°F 64% 1027 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

8 / 9 mph 66 / 65°F 52% 1026 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

9 / 10 mph 69 / 67°F 46% 1025 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

9 / 11 mph 68 / 67°F 44% 1025 mb
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
21:00

NNE
NNE

4 / 5 mph 62 / 60°F 64% 1027 mb
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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 17
May
00:00

E
E

3 / 3 mph 63 / 63°F 70% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
0.0 In
06:00

NE
NE

3 / 3 mph 55 / 56°F 55% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ENE
ENE

9 / 11 mph 67 / 67°F 42% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

ENE
ENE

6 / 6 mph 74 / 76°F 43% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 18
May
00:00

NNE
NNE

6 / 7 mph 56 / 55°F 72% 1034 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

N
N

7 / 8 mph 51 / 48°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

NNE
NNE

12 / 15 mph 63 / 64°F 43% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
18:00

NE
NE

8 / 11 mph 63 / 63°F 58% 1026 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
Mon 19
May
00:00

NNE
NNE

2 / 3 mph 58 / 59°F 85% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NNE
NNE

5 / 7 mph 50 / 48°F 83% 1028 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
17%
0.0 In
12:00

NNW
NNW

5 / 6 mph 73 / 75°F 36% 1029 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

E
E

8 / 11 mph 68 / 68°F 50% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 20
May
00:00

N
N

2 / 2 mph 63 / 63°F 61% 1030 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NE
NE

2 / 3 mph 59 / 58°F 68% 1027 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
12:00

NNE
NNE

4 / 6 mph 75 / 76°F 33% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ESE
ESE

9 / 13 mph 68 / 68°F 55% 1022 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Wed 21
May
00:00

WSW
WSW

3 / 4 mph 66 / 66°F 78% 1028 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NE
NE

2 / 2 mph 61 / 61°F 76% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 97%
Most Significant Cloud Type: medium
14%
0.0 In
12:00

WNW
WNW

8 / 10 mph 74 / 76°F 42% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
0.0 In
18:00

E
E

9 / 13 mph 66 / 66°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Thu 22
May
00:00

W
W

4 / 5 mph 65 / 65°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

S
S

2 / 2 mph 62 / 62°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

SW
SW

10 / 13 mph 72 / 75°F 37% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

WSW
WSW

9 / 13 mph 67 / 67°F 54% 1008 mb
Low level cloud: 7%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
64%
0.0 In
Fri 23
May
00:00

SW
SW

2 / 3 mph 64 / 64°F 83% 1016 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
06:00

SW
SW

6 / 8 mph 56 / 55°F 78% 1007 mb
Low level cloud: 38%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: low
74%
0.0 In
12:00

SSW
SSW

11 / 14 mph 69 / 69°F 31% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

SSW
SSW

10 / 16 mph 63 / 64°F 73% 1006 mb
Low level cloud: 70%
Mid level cloud: 44%
High level cloud: 8%
Most Significant Cloud Type: low
86%
0.0 In
Sat 24
May
00:00

W
W

6 / 8 mph 56 / 55°F 84% 1012 mb
Low level cloud: 31%
Mid level cloud: 26%
High level cloud: 91%
Most Significant Cloud Type: low
51%
0.0 In
06:00

S
S

9 / 13 mph 58 / 57°F 76% 1007 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: low
11%
0.0 In
12:00

SW
SW

9 / 12 mph 67 / 67°F 36% 1010 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 17%
Most Significant Cloud Type: medium
24%
0.0 In
18:00

WSW
WSW

6 / 10 mph 64 / 64°F 67% 1010 mb
Low level cloud: 40%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
Sun 25
May
00:00

SSW
SSW

4 / 5 mph 56 / 55°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

N
N

2 / 4 mph 61 / 61°F 84% 1013 mb
Low level cloud: 19%
Mid level cloud: 31%
High level cloud: 97%
Most Significant Cloud Type: low
41%
0.0 In
12:00

SSW
SSW

14 / 17 mph 56 / 52°F 73% 1007 mb
Low level cloud: 60%
Mid level cloud: 51%
High level cloud: 4%
Most Significant Cloud Type: low
78%
0.0 In
18:00

ENE
ENE

11 / 17 mph 67 / 67°F 63% 1012 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
34%
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