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Brombil 14 Day Long Range Forecast

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

Neath Port Talbot, United Kingdom

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

The next 14 day outlook for Brombil shows the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 29°C expected on the afternoon of Sunday 17th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Thursday 21st at 10°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The indicators are that Tuesday 19th 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 16
Aug		18:00

E
E

 13 / 15 mph 78 / 79°F 55% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 13 / 26 mph 66 / 65°F 61% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 17
Aug		00:00

E
E

 17 / 31 mph 61 / 61°F 64% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 13 / 23 mph 57 / 54°F 74% 1024 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
06:00

E
E

 14 / 25 mph 54 / 50°F 77% 1024 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
09:00

E
E

 19 / 21 mph 70 / 69°F 55% 1023 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
12:00

ESE
ESE

 16 / 18 mph 81 / 80°F 44% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 12 / 13 mph 84 / 83°F 40% 1021 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
18:00

E
E

 9 / 13 mph 81 / 79°F 47% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 7 / 15 mph 65 / 65°F 58% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: high
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Aug		00:00

E
E

 10 / 20 mph 62 / 62°F 72% 1021 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

E
E

 13 / 24 mph 60 / 60°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 58%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 16 / 28 mph 58 / 55°F 86% 1020 mb
Low level cloud: 8%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 17 / 19 mph 67 / 66°F 71% 1020 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 84%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 14 / 16 mph 79 / 80°F 56% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 90%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 11 / 13 mph 83 / 82°F 50% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 9 / 12 mph 81 / 80°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 10 / 14 mph 73 / 77°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 19
Aug		00:00

ENE
ENE

 13 / 16 mph 69 / 69°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 10 / 17 mph 62 / 62°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 32%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 9 / 16 mph 59 / 60°F 79% 1015 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 45%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 11 / 12 mph 72 / 76°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 47%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 10 / 12 mph 78 / 78°F 58% 1014 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 97%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 3 / 4 mph 78 / 78°F 63% 1014 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 93%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 5 / 10 mph 67 / 65°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 9 / 19 mph 64 / 64°F 72% 1015 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Aug		00:00

ENE
ENE

 13 / 21 mph 59 / 59°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 12 / 19 mph 56 / 52°F 85% 1016 mb
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 71%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 10 / 15 mph 55 / 52°F 85% 1017 mb
Low level cloud: 23%
Mid level cloud: 7%
High level cloud: 30%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 13 / 15 mph 68 / 67°F 64% 1017 mb
Low level cloud: 24%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 5 / 6 mph 75 / 77°F 54% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 5 / 6 mph 76 / 77°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 17%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 6 / 7 mph 75 / 77°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 11 / 22 mph 60 / 60°F 64% 1017 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
Thu 21
Aug		00:00

ENE
ENE

 10 / 18 mph 58 / 56°F 62% 1018 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
03:00

ENE
ENE

 8 / 14 mph 53 / 51°F 76% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 5 / 10 mph 50 / 49°F 77% 1020 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
09:00

ENE
ENE

 1 / 1 mph 65 / 63°F 60% 1020 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
12:00

SW
SW

 5 / 5 mph 69 / 67°F 57% 1020 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

W
W

 8 / 9 mph 72 / 76°F 57% 1019 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

W
W

 9 / 11 mph 72 / 76°F 68% 1019 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

NNW
NNW

 7 / 12 mph 60 / 60°F 74% 1020 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
Fri 22
Aug		00:00

N
N

 6 / 12 mph 56 / 55°F 77% 1020 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
03:00

NNE
NNE

 4 / 8 mph 52 / 51°F 78% 1019 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
06:00

N
N

 3 / 6 mph 52 / 52°F 78% 1019 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 5 / 6 mph 70 / 68°F 69% 1019 mb
Low level cloud: 25%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 11 mph 75 / 77°F 68% 1018 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 10 / 12 mph 76 / 78°F 75% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 10 / 12 mph 75 / 77°F 79% 1017 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 6 / 11 mph 60 / 60°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 23
Aug		00:00

NE
NE

 6 / 9 mph 54 / 53°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

E
E

 6 / 11 mph 56 / 55°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

W
W

 6 / 7 mph 72 / 76°F 52% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NNW
NNW

 18 / 30 mph 67 / 67°F 57% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
0.0 In
Sun 24
Aug		00:00

NNW
NNW

 2 / 2 mph 66 / 66°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

E
E

 7 / 11 mph 57 / 56°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

WSW
WSW

 14 / 19 mph 67 / 67°F 80% 1017 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: low
17%
0.0 In
18:00

WSW
WSW

 8 / 13 mph 71 / 71°F 79% 1018 mb
Low level cloud: 22%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
Mon 25
Aug		00:00

WSW
WSW

 3 / 4 mph 66 / 66°F 86% 1019 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

SSW
SSW

 7 / 12 mph 61 / 61°F 84% 1018 mb
Low level cloud: 92%
Mid level cloud: 41%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 8 / 10 mph 67 / 67°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

SSW
SSW

 17 / 29 mph 64 / 64°F 96% 1014 mb
Low level cloud: 99%
Mid level cloud: 85%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.6 In
Tue 26
Aug		00:00

WSW
WSW

 4 / 6 mph 70 / 70°F 88% 1013 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
0.0 In
06:00

SSW
SSW

 0 / 1 mph 61 / 61°F 88% 1013 mb
Low level cloud: 46%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
12:00

WSW
WSW

 6 / 8 mph 70 / 70°F 80% 1009 mb
Low level cloud: 48%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
91%
0.0 In
18:00

WSW
WSW

 10 / 16 mph 67 / 67°F 79% 1009 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 99%
Most Significant Cloud Type: medium
15%
0.0 In
Wed 27
Aug		00:00

WSW
WSW

 13 / 19 mph 58 / 56°F 86% 1008 mb
Low level cloud: 71%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.2 In
06:00

SW
SW

 17 / 31 mph 59 / 55°F 90% 1007 mb
Low level cloud: 55%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.1 In
12:00

WSW
WSW

 18 / 34 mph 63 / 63°F 76% 1010 mb
Low level cloud: 38%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.2 In
18:00

SW
SW

 22 / 47 mph 64 / 64°F 87% 1004 mb
Low level cloud: 66%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.2 In
Thu 28
Aug		00:00

W
W

 13 / 27 mph 57 / 54°F 84% 1011 mb
Low level cloud: 53%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
70%
0.2 In
06:00

WSW
WSW

 21 / 45 mph 59 / 55°F 87% 1001 mb
Low level cloud: 87%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
12:00

WSW
WSW

 13 / 28 mph 64 / 64°F 59% 1010 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: medium
32%
0.1 In
18:00

WNW
WNW

 14 / 30 mph 60 / 60°F 81% 1007 mb
Low level cloud: 14%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.2 In
Fri 29
Aug		00:00

NW
NW

 7 / 15 mph 59 / 58°F 80% 1014 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 69%
Most Significant Cloud Type: medium
24%
0.0 In
06:00

WNW
WNW

 10 / 21 mph 55 / 52°F 88% 1014 mb
Low level cloud: 60%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
12:00

WSW
WSW

 16 / 33 mph 61 / 61°F 67% 1018 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 51%
Most Significant Cloud Type: low
16%
0.0 In
18:00

WSW
WSW

 9 / 19 mph 62 / 62°F 74% 1016 mb
Low level cloud: 14%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
18%
0.0 In
Sat 30
Aug		00:00

WSW
WSW

 23 / 47 mph 63 / 63°F 97% 1017 mb
Low level cloud: 99%
Mid level cloud: 49%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SW
SW

 17 / 36 mph 63 / 63°F 93% 1011 mb
Low level cloud: 83%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.8 In
12:00

W
W

 16 / 34 mph 63 / 63°F 94% 1019 mb
Low level cloud: 95%
Mid level cloud: 89%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

 14 / 30 mph 62 / 62°F 86% 1012 mb
Low level cloud: 44%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.1 In
Sun 31
Aug		00:00

WSW
WSW

 19 / 40 mph 59 / 55°F 96% 1018 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 29%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

 11 / 23 mph 55 / 52°F 89% 1017 mb
Low level cloud: 7%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
68%
0.0 In
12:00

W
W

 11 / 23 mph 63 / 63°F 96% 1016 mb
Low level cloud: 92%
Mid level cloud: 91%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.2 In
18:00

N
N

 14 / 29 mph 59 / 56°F 70% 1023 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
7%
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