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Llandawke 14 Day Long Range Forecast

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

Carmarthenshire, United Kingdom

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

Taking a look at Llandawke over the coming two weeks and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 20°C expected on the afternoon of Monday 3rd. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 25th at 8°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Current predictions suggest Tuesday 28th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
15:00

SSE
SSE

14 / 16 mph 62 / 62°F 69% 1013 mb
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

15 / 22 mph 54 / 50°F 89% 1012 mb
Low level cloud: 89%
Mid level cloud: 98%
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

10 / 15 mph 50 / 46°F 93% 1011 mb
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Sun 26
May
00:00

ESE
ESE

16 / 21 mph 53 / 48°F 93% 1008 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSE
SSE

14 / 25 mph 52 / 47°F 94% 1007 mb
Low level cloud: 92%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

11 / 23 mph 52 / 46°F 92% 1008 mb
Low level cloud: 21%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
31%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

16 / 28 mph 54 / 49°F 87% 1008 mb
Low level cloud: 11%
Mid level cloud: 27%
High level cloud: 15%
Most Significant Cloud Type: low
22%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WSW
WSW

14 / 20 mph 57 / 53°F 86% 1010 mb
Low level cloud: 37%
Mid level cloud: 43%
High level cloud: 72%
Most Significant Cloud Type: low
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

17 / 23 mph 58 / 54°F 85% 1010 mb
Low level cloud: 43%
Mid level cloud: 22%
High level cloud: 69%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

18 / 23 mph 57 / 52°F 88% 1011 mb
Low level cloud: 38%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

17 / 21 mph 55 / 49°F 89% 1012 mb
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

W
W

17 / 25 mph 51 / 46°F 87% 1013 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 20%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

10 / 17 mph 50 / 46°F 82% 1013 mb
Low level cloud: 6%
Mid level cloud: 62%
High level cloud: 98%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

6 / 12 mph 50 / 46°F 80% 1014 mb
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

14 / 23 mph 52 / 47°F 76% 1014 mb
Low level cloud: 33%
Mid level cloud: 12%
High level cloud: 10%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

13 / 18 mph 56 / 51°F 70% 1014 mb
Low level cloud: 6%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

14 / 16 mph 57 / 53°F 74% 1014 mb
Low level cloud: 32%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

13 / 18 mph 56 / 51°F 79% 1015 mb
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

8 / 13 mph 54 / 50°F 90% 1015 mb
Low level cloud: 46%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
00:00

SSW
SSW

8 / 12 mph 55 / 53°F 96% 1014 mb
Low level cloud: 98%
Mid level cloud: 73%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

13 / 25 mph 53 / 49°F 99% 1012 mb
Low level cloud: 99%
Mid level cloud: 68%
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

SW
SW

16 / 33 mph 52 / 47°F 98% 1012 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 90%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

SW
SW

18 / 31 mph 55 / 51°F 97% 1012 mb
Low level cloud: 99%
Mid level cloud: 47%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

22 / 26 mph 59 / 55°F 97% 1011 mb
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

SW
SW

21 / 26 mph 60 / 60°F 98% 1010 mb
Low level cloud: 100%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

20 / 26 mph 59 / 55°F 98% 1009 mb
Low level cloud: 92%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

22 / 34 mph 56 / 51°F 84% 1009 mb
Low level cloud: 89%
Mid level cloud: 1%
High level cloud: 7%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May
00:00

WSW
WSW

22 / 30 mph 55 / 50°F 90% 1009 mb
Low level cloud: 68%
Mid level cloud: 44%
High level cloud: 41%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

20 / 31 mph 54 / 49°F 89% 1009 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

18 / 31 mph 54 / 48°F 88% 1009 mb
Low level cloud: 39%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

19 / 26 mph 56 / 51°F 85% 1010 mb
Low level cloud: 84%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

20 / 27 mph 58 / 54°F 80% 1010 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

19 / 25 mph 60 / 55°F 83% 1011 mb
Low level cloud: 27%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

18 / 28 mph 59 / 54°F 83% 1011 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

16 / 25 mph 57 / 52°F 85% 1012 mb
Low level cloud: 8%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
00:00

NW
NW

15 / 24 mph 53 / 49°F 88% 1013 mb
Low level cloud: 32%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

13 / 19 mph 52 / 47°F 91% 1014 mb
Low level cloud: 24%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

15 / 23 mph 52 / 46°F 90% 1015 mb
Low level cloud: 34%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

17 / 22 mph 54 / 49°F 81% 1016 mb
Low level cloud: 87%
Mid level cloud: 40%
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

NW
NW

15 / 17 mph 57 / 53°F 77% 1016 mb
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

17 / 21 mph 59 / 55°F 78% 1016 mb
Low level cloud: 71%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

17 / 24 mph 57 / 53°F 80% 1018 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

21 / 27 mph 55 / 49°F 82% 1019 mb
Low level cloud: 18%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
00:00

NNW
NNW

21 / 24 mph 54 / 48°F 81% 1020 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

20 / 25 mph 52 / 47°F 77% 1020 mb
Low level cloud: 86%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

18 / 25 mph 52 / 46°F 82% 1021 mb
Low level cloud: 73%
Mid level cloud: 4%
High level cloud: 21%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

21 / 26 mph 54 / 49°F 78% 1021 mb
Low level cloud: 91%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

20 / 23 mph 57 / 52°F 80% 1022 mb
Low level cloud: 75%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

21 / 24 mph 59 / 54°F 73% 1022 mb
Low level cloud: 39%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

18 / 22 mph 57 / 53°F 79% 1022 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

16 / 20 mph 55 / 50°F 76% 1024 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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun
00:00

NW
NW

14 / 29 mph 51 / 46°F 76% 1014 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 30%
Most Significant Cloud Type: medium
21%
0.0 In
06:00

N
N

11 / 24 mph 52 / 48°F 90% 1019 mb
Low level cloud: 27%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
28%
0.0 In
12:00

W
W

9 / 18 mph 57 / 55°F 75% 1025 mb
Low level cloud: 86%
Mid level cloud: 31%
High level cloud: 6%
Most Significant Cloud Type: low
97%
0.0 In
18:00

NNW
NNW

7 / 14 mph 60 / 60°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 91%
Most Significant Cloud Type: medium
16%
0.0 In
Sun 02
Jun
00:00

WNW
WNW

4 / 8 mph 54 / 53°F 93% 1025 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 68%
Most Significant Cloud Type: low
84%
0.0 In
06:00

NNW
NNW

10 / 20 mph 54 / 51°F 92% 1026 mb
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
78%
0.0 In
12:00

NNW
NNW

15 / 32 mph 62 / 62°F 73% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

N
N

12 / 26 mph 62 / 62°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 03
Jun
00:00

N
N

8 / 18 mph 52 / 49°F 92% 1025 mb
Low level cloud: 36%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
06:00

N
N

7 / 15 mph 53 / 51°F 90% 1023 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
12:00

N
N

11 / 22 mph 61 / 61°F 85% 1023 mb
Low level cloud: 67%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
18:00

N
N

11 / 22 mph 64 / 64°F 85% 1022 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
0.0 In
Tue 04
Jun
00:00

NNW
NNW

7 / 15 mph 50 / 47°F 92% 1019 mb
Low level cloud: 32%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
49%
0.0 In
06:00

NNE
NNE

6 / 13 mph 56 / 55°F 92% 1022 mb
Low level cloud: 14%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
12:00

NNW
NNW

17 / 36 mph 55 / 50°F 77% 1016 mb
Low level cloud: 81%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
18:00

ENE
ENE

11 / 24 mph 62 / 62°F 79% 1023 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
Wed 05
Jun
00:00

NW
NW

10 / 21 mph 47 / 42°F 81% 1010 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
06:00

NE
NE

9 / 19 mph 53 / 49°F 90% 1024 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 19%
Most Significant Cloud Type: low
14%
0.0 In
12:00

NNW
NNW

12 / 25 mph 56 / 53°F 71% 1006 mb
Low level cloud: 35%
Mid level cloud: 44%
High level cloud: 8%
Most Significant Cloud Type: low
51%
0.1 In
18:00

ENE
ENE

5 / 11 mph 66 / 66°F 80% 1022 mb
Low level cloud: 44%
Mid level cloud: 8%
High level cloud: 18%
Most Significant Cloud Type: low
48%
0.0 In
Thu 06
Jun
00:00

NNW
NNW

8 / 16 mph 51 / 48°F 86% 1005 mb
Low level cloud: 97%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

8 / 17 mph 53 / 51°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

SE
SE

10 / 21 mph 54 / 51°F 82% 1005 mb
Low level cloud: 34%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.1 In
18:00

NE
NE

11 / 23 mph 67 / 67°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Fri 07
Jun
00:00

NNE
NNE

4 / 9 mph 58 / 58°F 85% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 11%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

NNE
NNE

9 / 19 mph 52 / 49°F 86% 1015 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 14%
Most Significant Cloud Type: medium
23%
0.0 In
12:00

WSW
WSW

8 / 17 mph 57 / 56°F 82% 1008 mb
Low level cloud: 8%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
11%
0.0 In
18:00

NNE
NNE

10 / 21 mph 67 / 67°F 85% 1012 mb
Low level cloud: 16%
Mid level cloud: 23%
High level cloud: 2%
Most Significant Cloud Type: low
24%
0.0 In
Sat 08
Jun
00:00

WNW
WNW

3 / 6 mph 53 / 53°F 91% 1008 mb
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
89%
0.1 In
06:00

NE
NE

8 / 17 mph 56 / 54°F 92% 1011 mb
Low level cloud: 62%
Mid level cloud: 28%
High level cloud: 39%
Most Significant Cloud Type: low
76%
0.0 In
12:00

SSW
SSW

9 / 19 mph 55 / 53°F 90% 1008 mb
Low level cloud: 66%
Mid level cloud: 82%
High level cloud: 33%
Most Significant Cloud Type: low
98%
0.1 In
18:00

NNE
NNE

10 / 22 mph 63 / 63°F 95% 1009 mb
Low level cloud: 65%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sun 09
Jun
00:00

S
S

10 / 20 mph 54 / 51°F 83% 1010 mb
Low level cloud: 50%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: low
58%
0.1 In
06:00

ENE
ENE

4 / 9 mph 60 / 60°F 96% 1008 mb
Low level cloud: 84%
Mid level cloud: 32%
High level cloud: 16%
Most Significant Cloud Type: low
97%
0.1 In
12:00

S
S

13 / 28 mph 57 / 55°F 75% 1010 mb
Low level cloud: 16%
Mid level cloud: 6%
High level cloud: 93%
Most Significant Cloud Type: low
29%
0.0 In
18:00

NNW
NNW

1 / 3 mph 65 / 65°F 90% 1008 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
70%
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