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Chapel Hill 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Chapel Hill

Monmouthshire, United Kingdom

Long range weather outlook for Chapel Hill includes 14 day forecast summary:

Reviewing the forecast for Chapel Hill Over the next 14 days and the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 14°C expected on the afternoon of Sunday 10th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Saturday 16th at 2°C. Expect the following 14 days ahead to remain predominantly dry. On the whole winds are likely to be light. The strongest wind will be felt on the evening of Tuesday 19th, coming from a north westerly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 10
Nov		18:00

SW
SW

 5 / 7 mph 57 / 56°F 92% 1029 mb
Low level cloud: 71%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 4 / 6 mph 55 / 55°F 90% 1031 mb
Low level cloud: 81%
Mid level cloud: 69%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 11
Nov		00:00

WNW
WNW

 3 / 5 mph 53 / 53°F 93% 1031 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 5 / 8 mph 52 / 51°F 89% 1033 mb
Low level cloud: 90%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 7 / 12 mph 49 / 46°F 79% 1035 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

 6 / 9 mph 49 / 46°F 84% 1037 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 10 / 13 mph 52 / 49°F 69% 1037 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 15%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 8 / 12 mph 52 / 49°F 73% 1037 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 15%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 6 / 11 mph 47 / 44°F 87% 1038 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 7 / 12 mph 44 / 40°F 91% 1039 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 12
Nov		00:00

N
N

 6 / 11 mph 42 / 38°F 93% 1038 mb
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 6 / 11 mph 40 / 36°F 92% 1038 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 7 / 13 mph 40 / 35°F 90% 1038 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 8 / 13 mph 42 / 37°F 85% 1038 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 13 / 16 mph 48 / 42°F 77% 1038 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 11 / 16 mph 48 / 43°F 79% 1036 mb
Low level cloud: 37%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 10 / 16 mph 45 / 40°F 86% 1037 mb
Low level cloud: 7%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 14 mph 44 / 39°F 87% 1037 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 13
Nov		00:00

N
N

 8 / 12 mph 44 / 39°F 86% 1036 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 8 / 13 mph 42 / 37°F 82% 1034 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 8 / 17 mph 41 / 35°F 76% 1033 mb
Low level cloud: 40%
Mid level cloud: 95%
High level cloud: 1%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 18 mph 44 / 38°F 80% 1033 mb
Low level cloud: 96%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 11 / 13 mph 48 / 43°F 87% 1033 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 13 / 17 mph 49 / 44°F 81% 1032 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 10 / 15 mph 48 / 44°F 82% 1033 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 52%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 11 mph 46 / 42°F 89% 1034 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 14
Nov		00:00

NNE
NNE

 5 / 10 mph 42 / 38°F 92% 1033 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 4 / 8 mph 41 / 38°F 92% 1033 mb
Low level cloud: 13%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 4 / 8 mph 41 / 39°F 91% 1032 mb
Low level cloud: 5%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 4 / 6 mph 44 / 42°F 86% 1032 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 77%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 6 / 8 mph 50 / 47°F 73% 1032 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 4%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 6 / 9 mph 50 / 47°F 81% 1030 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 12 mph 45 / 42°F 92% 1030 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 12 mph 43 / 39°F 94% 1030 mb
Low level cloud: 25%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 15
Nov		00:00

NE
NE

 6 / 11 mph 42 / 38°F 96% 1030 mb
Low level cloud: 44%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 6 / 11 mph 40 / 36°F 93% 1028 mb
Low level cloud: 8%
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
06:00

NE
NE

 5 / 11 mph 38 / 34°F 93% 1028 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 4 / 6 mph 40 / 37°F 91% 1027 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 4 / 5 mph 47 / 45°F 78% 1025 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 4 / 6 mph 47 / 46°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 3 / 6 mph 42 / 40°F 91% 1023 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 3 / 6 mph 40 / 38°F 92% 1023 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
Sat 16
Nov		00:00

NE
NE

 3 / 6 mph 39 / 37°F 91% 1022 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 3 / 6 mph 37 / 36°F 90% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 91%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 4 / 9 mph 37 / 34°F 89% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 5 / 9 mph 39 / 35°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 94%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 6 / 8 mph 46 / 43°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 20%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 6 / 9 mph 47 / 44°F 84% 1019 mb
Low level cloud: 21%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 5 / 11 mph 43 / 40°F 92% 1020 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 7 / 15 mph 41 / 37°F 94% 1020 mb
Low level cloud: 55%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 17
Nov		00:00

NNE
NNE

 2 / 3 mph 49 / 50°F 75% 1017 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
51%
0.0 In
06:00

NNE
NNE

 8 / 14 mph 42 / 37°F 88% 1017 mb
Low level cloud: 11%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

E
E

 8 / 12 mph 50 / 46°F 92% 1012 mb
Low level cloud: 95%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 2 / 2 mph 47 / 47°F 82% 1012 mb
Low level cloud: 51%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
Mon 18
Nov		00:00

N
N

 17 / 27 mph 36 / 26°F 76% 1008 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

NW
NW

 3 / 5 mph 43 / 42°F 85% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
0.0 In
12:00

W
W

 9 / 11 mph 45 / 41°F 77% 1023 mb
Low level cloud: 74%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
91%
0.0 In
18:00

WNW
WNW

 13 / 15 mph 52 / 48°F 83% 1013 mb
Low level cloud: 20%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Tue 19
Nov		00:00

WSW
WSW

 15 / 23 mph 50 / 45°F 92% 1009 mb
Low level cloud: 89%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 14 / 30 mph 45 / 38°F 85% 1011 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 29 / 42 mph 46 / 37°F 72% 995 mb
Low level cloud: 1%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.2 In
18:00

NW
NW

 13 / 16 mph 52 / 47°F 80% 1009 mb
Low level cloud: 81%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
Wed 20
Nov		00:00

NW
NW

 17 / 28 mph 40 / 31°F 65% 1002 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

E
E

 5 / 9 mph 39 / 35°F 80% 1008 mb
Low level cloud: 97%
Mid level cloud: 92%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

 17 / 26 mph 42 / 34°F 65% 1010 mb
Low level cloud: 6%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

N
N

 11 / 15 mph 45 / 39°F 97% 994 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.9 In
Thu 21
Nov		00:00

WNW
WNW

 9 / 18 mph 34 / 27°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

WNW
WNW

 6 / 9 mph 38 / 34°F 80% 995 mb
Low level cloud: 86%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.1 In
12:00

NW
NW

 13 / 22 mph 38 / 29°F 68% 1013 mb
Low level cloud: 44%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
59%
0.0 In
18:00

NW
NW

 5 / 6 mph 40 / 37°F 84% 999 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 22
Nov		00:00

W
W

 5 / 9 mph 34 / 29°F 74% 1011 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
06:00

NNE
NNE

 6 / 9 mph 32 / 27°F 94% 1001 mb
Low level cloud: 31%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
35%
0.0 In
12:00

WSW
WSW

 5 / 9 mph 42 / 38°F 58% 1007 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

NNE
NNE

 13 / 17 mph 37 / 28°F 86% 1000 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
90%
0.0 In
Sat 23
Nov		00:00

N
N

 4 / 6 mph 35 / 32°F 90% 1007 mb
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

N
N

 13 / 22 mph 31 / 21°F 61% 1001 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
0.0 In
12:00

SW
SW

 4 / 8 mph 43 / 40°F 62% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

WNW
WNW

 3 / 4 mph 42 / 41°F 62% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
0.0 In
Sun 24
Nov		00:00

ENE
ENE

 3 / 6 mph 34 / 31°F 69% 1008 mb
Low level cloud: 31%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
06:00

E
E

 7 / 10 mph 32 / 26°F 96% 1004 mb
Low level cloud: 83%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.1 In
12:00

E
E

 8 / 15 mph 40 / 35°F 59% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

SSW
SSW

 3 / 5 mph 35 / 32°F 93% 1010 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 88%
Most Significant Cloud Type: medium
21%
0.0 In
Mon 25
Nov		00:00

E
E

 14 / 24 mph 34 / 24°F 74% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
0.0 In
06:00

S
S

 4 / 8 mph 40 / 37°F 96% 1007 mb
Low level cloud: 82%
Mid level cloud: 32%
High level cloud: 6%
Most Significant Cloud Type: low
93%
0.1 In
12:00

E
E

 22 / 39 mph 42 / 33°F 65% 1000 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: medium
54%
0.0 In
18:00

SW
SW

 17 / 27 mph 48 / 42°F 95% 1004 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.1 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