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Llannon 14 Day Long Range Forecast

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

Carmarthenshire, United Kingdom

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

Over the next 14 days the Llannon forecast suggests the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 29°C expected on the afternoon of Tuesday 12th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Thursday 21st at 11°C. Expect the next 14 days have mostly dry days although Thursday is likely to see a little rain. It looks like Thursday 14th 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
Tue 12
Aug		18:00

WSW
WSW

 7 / 15 mph 75 / 76°F 66% 1011 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 5 / 11 mph 68 / 68°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 13
Aug		00:00

S
S

 4 / 7 mph 64 / 64°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 3 / 6 mph 62 / 62°F 96% 1013 mb
Low level cloud: 53%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 3 / 5 mph 65 / 62°F 96% 1013 mb
Low level cloud: 55%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 4 / 4 mph 70 / 68°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 20%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 8 / 10 mph 72 / 76°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 10 / 12 mph 71 / 70°F 73% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 7 / 9 mph 69 / 67°F 83% 1014 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 4 / 7 mph 63 / 63°F 96% 1015 mb
Low level cloud: 51%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 14
Aug		00:00

S
S

 4 / 6 mph 62 / 62°F 97% 1015 mb
Low level cloud: 70%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 9 / 15 mph 61 / 61°F 97% 1015 mb
Low level cloud: 91%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 10 / 19 mph 60 / 60°F 97% 1015 mb
Low level cloud: 92%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 11 / 17 mph 64 / 63°F 93% 1017 mb
Low level cloud: 61%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 14 / 18 mph 67 / 66°F 83% 1018 mb
Low level cloud: 77%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 13 / 15 mph 69 / 68°F 81% 1020 mb
Low level cloud: 54%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 10 / 12 mph 68 / 66°F 86% 1021 mb
Low level cloud: 27%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 5 / 6 mph 65 / 65°F 93% 1022 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 15
Aug		00:00

NNE
NNE

 4 / 7 mph 62 / 62°F 92% 1024 mb
Low level cloud: 9%
Mid level cloud: 4%
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

 5 / 10 mph 60 / 60°F 92% 1024 mb
Low level cloud: 6%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 6 / 12 mph 59 / 60°F 90% 1024 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 5 / 6 mph 71 / 69°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 2 / 2 mph 76 / 77°F 59% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 2 / 3 mph 79 / 78°F 54% 1024 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 8 / 13 mph 78 / 78°F 60% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 19 mph 67 / 67°F 79% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 16
Aug		00:00

ENE
ENE

 12 / 24 mph 66 / 66°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 9 / 20 mph 62 / 62°F 82% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 8 / 14 mph 62 / 62°F 84% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 11 / 14 mph 71 / 70°F 62% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 11 / 15 mph 77 / 78°F 51% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 10 / 16 mph 82 / 81°F 44% 1023 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 10 / 20 mph 80 / 80°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 14 / 28 mph 73 / 76°F 50% 1022 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 67%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 17
Aug		00:00

E
E

 15 / 27 mph 68 / 67°F 58% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 12 / 23 mph 62 / 62°F 71% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 10 / 19 mph 60 / 60°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 15 / 19 mph 72 / 70°F 52% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 12 / 17 mph 78 / 78°F 44% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 9 / 14 mph 82 / 80°F 38% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 8 / 13 mph 82 / 81°F 44% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 11 / 24 mph 69 / 69°F 49% 1019 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
Mon 18
Aug		00:00

E
E

 10 / 20 mph 65 / 65°F 53% 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
03:00

ENE
ENE

 9 / 17 mph 59 / 57°F 67% 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

 9 / 16 mph 56 / 54°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 12 / 16 mph 69 / 68°F 52% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 13 / 17 mph 75 / 77°F 43% 1017 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
15:00

E
E

 9 / 15 mph 79 / 78°F 37% 1015 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
18:00

ENE
ENE

 7 / 15 mph 79 / 78°F 44% 1014 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
21:00

ENE
ENE

 14 / 27 mph 71 / 71°F 44% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 19
Aug		00:00

ENE
ENE

 7 / 12 mph 61 / 61°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NE
NE

 10 / 18 mph 58 / 56°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ESE
ESE

 15 / 24 mph 73 / 76°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 9%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

W
W

 8 / 15 mph 72 / 72°F 68% 1013 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
0.0 In
Wed 20
Aug		00:00

NNE
NNE

 6 / 11 mph 65 / 65°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

NE
NE

 4 / 7 mph 66 / 66°F 77% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 31%
Most Significant Cloud Type: medium
23%
0.0 In
12:00

S
S

 2 / 3 mph 77 / 79°F 52% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
0.0 In
18:00

NW
NW

 3 / 4 mph 74 / 77°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
33%
0.0 In
Thu 21
Aug		00:00

NE
NE

 8 / 16 mph 63 / 63°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NE
NE

 8 / 15 mph 52 / 49°F 91% 1018 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
12:00

WSW
WSW

 8 / 11 mph 74 / 77°F 53% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

N
N

 6 / 9 mph 73 / 76°F 48% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
8%
0.0 In
Fri 22
Aug		00:00

WSW
WSW

 2 / 3 mph 65 / 65°F 78% 1013 mb
Low level cloud: 3%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: medium
33%
0.0 In
06:00

ENE
ENE

 7 / 13 mph 53 / 51°F 77% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

NW
NW

 14 / 19 mph 64 / 64°F 57% 1016 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 91%
Most Significant Cloud Type: low
25%
0.0 In
18:00

NW
NW

 5 / 8 mph 72 / 76°F 55% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
Sat 23
Aug		00:00

WNW
WNW

 12 / 19 mph 56 / 53°F 83% 1016 mb
Low level cloud: 17%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

E
E

 5 / 9 mph 60 / 60°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
12:00

WNW
WNW

 17 / 24 mph 60 / 60°F 59% 1013 mb
Low level cloud: 89%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
18:00

NNW
NNW

 9 / 14 mph 72 / 72°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
Sun 24
Aug		00:00

N
N

 7 / 13 mph 54 / 52°F 94% 1016 mb
Low level cloud: 40%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
06:00

E
E

 5 / 7 mph 64 / 64°F 71% 1025 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 86%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

NW
NW

 3 / 4 mph 70 / 71°F 48% 1022 mb
Low level cloud: 2%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
18:00

NW
NW

 7 / 12 mph 71 / 71°F 56% 1023 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 52%
Most Significant Cloud Type: medium
14%
0.0 In
Mon 25
Aug		00:00

N
N

 6 / 11 mph 57 / 56°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

 5 / 10 mph 61 / 61°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

SW
SW

 11 / 16 mph 67 / 67°F 65% 1023 mb
Low level cloud: 20%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
18:00

NNW
NNW

 13 / 20 mph 67 / 67°F 58% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 26
Aug		00:00

SW
SW

 7 / 10 mph 63 / 63°F 98% 1021 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 90%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

 5 / 9 mph 58 / 58°F 69% 1025 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 22%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

N
N

 13 / 18 mph 59 / 56°F 86% 1020 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

 13 / 18 mph 65 / 65°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: medium
45%
0.0 In
Wed 27
Aug		00:00

W
W

 3 / 4 mph 57 / 58°F 82% 1020 mb
Low level cloud: 8%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
17%
0.0 In
06:00

WNW
WNW

 16 / 23 mph 61 / 61°F 88% 1018 mb
Low level cloud: 98%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 17 / 26 mph 64 / 64°F 80% 1016 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 13 / 19 mph 68 / 68°F 56% 1018 mb
Low level cloud: 3%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
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