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Port Tennant 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Port Tennant

Neath Port Talbot, United Kingdom

Long range weather outlook for Port Tennant includes 14 day forecast summary:

Over the next 14 days the Port Tennant forecast suggests the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 15°C expected on the afternoon of Sunday 27th. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Sunday 20th at 6°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Friday 18th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 18
Apr		15:00

ESE
ESE

 21 / 24 mph 51 / 44°F 95% 1003 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ESE
ESE

 20 / 23 mph 50 / 44°F 96% 1003 mb
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ESE
ESE

 17 / 21 mph 49 / 43°F 96% 1003 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 19
Apr		00:00

E
E

 16 / 26 mph 48 / 42°F 94% 1003 mb
Low level cloud: 98%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

E
E

 21 / 40 mph 47 / 40°F 92% 1002 mb
Low level cloud: 89%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

ESE
ESE

 21 / 39 mph 46 / 38°F 94% 1003 mb
Low level cloud: 97%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

E
E

 19 / 26 mph 49 / 42°F 93% 1005 mb
Low level cloud: 93%
Mid level cloud: 66%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 19 / 22 mph 51 / 45°F 86% 1006 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 17 / 22 mph 53 / 47°F 77% 1007 mb
Low level cloud: 44%
Mid level cloud: 45%
High level cloud: 80%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 12 / 18 mph 52 / 47°F 77% 1007 mb
Low level cloud: 37%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 12 / 21 mph 49 / 45°F 72% 1008 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 20
Apr		00:00

ENE
ENE

 8 / 14 mph 46 / 42°F 80% 1008 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 5%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 6 / 12 mph 44 / 40°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 31%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 7 / 11 mph 45 / 42°F 70% 1007 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 5 / 7 mph 49 / 46°F 66% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 10 / 12 mph 55 / 51°F 65% 1007 mb
Low level cloud: 7%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 12 / 13 mph 57 / 53°F 69% 1006 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 7 / 9 mph 51 / 48°F 81% 1006 mb
Low level cloud: 93%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 6 / 9 mph 49 / 46°F 83% 1007 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 21
Apr		00:00

S
S

 3 / 4 mph 49 / 48°F 88% 1006 mb
Low level cloud: 65%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 6 / 7 mph 49 / 46°F 94% 1006 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 6 / 7 mph 48 / 45°F 93% 1007 mb
Low level cloud: 99%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 7 / 10 mph 49 / 45°F 90% 1008 mb
Low level cloud: 55%
Mid level cloud: 17%
High level cloud: 1%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 16 / 21 mph 52 / 46°F 76% 1009 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 28%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 15 / 21 mph 51 / 45°F 70% 1011 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 11 / 15 mph 50 / 45°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 8 / 13 mph 47 / 42°F 90% 1014 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 22
Apr		00:00

SW
SW

 7 / 11 mph 47 / 44°F 90% 1014 mb
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 6 / 9 mph 46 / 43°F 91% 1014 mb
Low level cloud: 94%
Mid level cloud: 77%
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

SSW
SSW

 7 / 14 mph 45 / 41°F 91% 1014 mb
Low level cloud: 32%
Mid level cloud: 28%
High level cloud: 15%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 9 / 15 mph 48 / 43°F 86% 1015 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 4 / 5 mph 51 / 50°F 91% 1015 mb
Low level cloud: 98%
Mid level cloud: 80%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

SSE
SSE

 7 / 8 mph 54 / 50°F 83% 1015 mb
Low level cloud: 62%
Mid level cloud: 25%
High level cloud: 12%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 7 / 10 mph 53 / 49°F 87% 1015 mb
Low level cloud: 30%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 8 / 11 mph 49 / 46°F 92% 1016 mb
Low level cloud: 65%
Mid level cloud: 18%
High level cloud: 20%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 23
Apr		00:00

E
E

 8 / 14 mph 47 / 43°F 92% 1016 mb
Low level cloud: 53%
Mid level cloud: 33%
High level cloud: 2%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 8 / 14 mph 46 / 42°F 91% 1016 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 8 / 14 mph 46 / 42°F 90% 1017 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 9 / 13 mph 53 / 49°F 78% 1017 mb
Low level cloud: 52%
Mid level cloud: 32%
High level cloud: 16%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 9 / 12 mph 55 / 51°F 75% 1018 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 6 / 9 mph 56 / 53°F 73% 1018 mb
Low level cloud: 50%
Mid level cloud: 34%
High level cloud: 1%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 1 / 2 mph 56 / 54°F 80% 1018 mb
Low level cloud: 53%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 3 / 5 mph 49 / 49°F 89% 1020 mb
Low level cloud: 20%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Apr		00:00

NE
NE

 5 / 10 mph 47 / 44°F 89% 1020 mb
Low level cloud: 9%
Mid level cloud: 24%
High level cloud: 97%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 6 / 11 mph 46 / 42°F 90% 1020 mb
Low level cloud: 15%
Mid level cloud: 27%
High level cloud: 14%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 5 / 8 mph 46 / 43°F 89% 1021 mb
Low level cloud: 8%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 3 / 4 mph 51 / 49°F 82% 1021 mb
Low level cloud: 70%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 1 / 2 mph 56 / 54°F 72% 1021 mb
Low level cloud: 41%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 3 / 4 mph 55 / 54°F 72% 1021 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 1 / 1 mph 55 / 53°F 81% 1021 mb
Low level cloud: 39%
Mid level cloud: 32%
High level cloud: 10%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 4 / 7 mph 49 / 47°F 85% 1022 mb
Low level cloud: 50%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 25
Apr		00:00

ENE
ENE

 9 / 17 mph 45 / 41°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
0.0 In
06:00

E
E

 5 / 8 mph 50 / 48°F 78% 1017 mb
Low level cloud: 22%
Mid level cloud: 100%
High level cloud: 87%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

ESE
ESE

 11 / 21 mph 56 / 54°F 77% 1020 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
7%
0.0 In
18:00

W
W

 11 / 18 mph 55 / 51°F 88% 1017 mb
Low level cloud: 6%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
0.0 In
Sat 26
Apr		00:00

NNE
NNE

 5 / 8 mph 51 / 49°F 92% 1024 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
55%
0.0 In
06:00

ENE
ENE

 5 / 8 mph 49 / 48°F 84% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
0.0 In
12:00

ESE
ESE

 3 / 6 mph 57 / 58°F 59% 1028 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

NW
NW

 2 / 4 mph 57 / 57°F 80% 1028 mb
Low level cloud: 41%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
Sun 27
Apr		00:00

ESE
ESE

 4 / 8 mph 50 / 48°F 81% 1031 mb
Low level cloud: 93%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
95%
0.0 In
06:00

ENE
ENE

 1 / 3 mph 52 / 52°F 87% 1029 mb
Low level cloud: 15%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
12:00

SSW
SSW

 6 / 10 mph 54 / 53°F 69% 1032 mb
Low level cloud: 74%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
75%
0.0 In
18:00

WNW
WNW

 5 / 10 mph 56 / 56°F 80% 1028 mb
Low level cloud: 64%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
65%
0.0 In
Mon 28
Apr		00:00

N
N

 1 / 2 mph 53 / 53°F 82% 1031 mb
Low level cloud: 90%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
06:00

NNW
NNW

 2 / 5 mph 52 / 52°F 76% 1027 mb
Low level cloud: 33%
Mid level cloud: 78%
High level cloud: 3%
Most Significant Cloud Type: low
60%
0.0 In
12:00

SSW
SSW

 6 / 11 mph 58 / 57°F 68% 1029 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
18:00

NNW
NNW

 2 / 3 mph 57 / 57°F 83% 1026 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
84%
0.0 In
Tue 29
Apr		00:00

W
W

 3 / 6 mph 51 / 51°F 89% 1028 mb
Low level cloud: 25%
Mid level cloud: 0%
High level cloud: 78%
Most Significant Cloud Type: low
34%
0.0 In
06:00

ENE
ENE

 3 / 6 mph 55 / 55°F 88% 1026 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
12:00

SW
SW

 6 / 10 mph 56 / 55°F 76% 1028 mb
Low level cloud: 30%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
18:00

WNW
WNW

 5 / 10 mph 59 / 59°F 79% 1026 mb
Low level cloud: 21%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
Wed 30
Apr		00:00

NNW
NNW

 2 / 3 mph 49 / 49°F 86% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
06:00

SSE
SSE

 2 / 3 mph 57 / 57°F 83% 1027 mb
Low level cloud: 13%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
12:00

S
S

 4 / 7 mph 58 / 58°F 71% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 29%
Most Significant Cloud Type: high
29%
0.0 In
18:00

NNW
NNW

 9 / 18 mph 57 / 55°F 77% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 36%
Most Significant Cloud Type: high
36%
0.0 In
Thu 01
May		00:00

SE
SE

 3 / 5 mph 53 / 54°F 87% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 39%
Most Significant Cloud Type: high
38%
0.0 In
06:00

NNE
NNE

 6 / 14 mph 49 / 46°F 80% 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

S
S

 5 / 9 mph 61 / 61°F 61% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
0.0 In
18:00

NNE
NNE

 3 / 7 mph 61 / 60°F 77% 1026 mb
Low level cloud: 40%
Mid level cloud: 29%
High level cloud: 6%
Most Significant Cloud Type: low
50%
0.0 In
Fri 02
May		00:00

NE
NE

 2 / 4 mph 57 / 58°F 83% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

ENE
ENE

 10 / 20 mph 44 / 39°F 82% 1027 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

SW
SW

 4 / 7 mph 65 / 65°F 67% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ENE
ENE

 11 / 23 mph 54 / 51°F 77% 1027 mb
Low level cloud: 76%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
Sat 03
May		00:00

N
N

 6 / 11 mph 52 / 50°F 89% 1030 mb
Low level cloud: 68%
Mid level cloud: 46%
High level cloud: 58%
Most Significant Cloud Type: low
91%
0.0 In
06:00

NE
NE

 8 / 17 mph 42 / 37°F 85% 1028 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
12:00

N
N

 4 / 8 mph 56 / 55°F 60% 1033 mb
Low level cloud: 58%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.2 In
18:00

ENE
ENE

 12 / 24 mph 53 / 49°F 72% 1025 mb
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 47%
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