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Llandegla 14 Day Long Range Forecast

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

Denbighshire, United Kingdom

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

The next 14 day outlook for Llandegla shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the afternoon of Tuesday 28th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Tuesday 28th at 3°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Predictions are Sunday 26th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
15:00

NW
NW

4 / 4 mph 56 / 56°F 76% 1018 mb
Low level cloud: 89%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

3 / 4 mph 54 / 53°F 89% 1019 mb
Low level cloud: 75%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

2 / 2 mph 50 / 49°F 95% 1019 mb
Low level cloud: 56%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

S
S

2 / 3 mph 46 / 46°F 96% 1019 mb
Low level cloud: 30%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

4 / 8 mph 42 / 40°F 97% 1019 mb
Low level cloud: 37%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

4 / 7 mph 49 / 46°F 94% 1018 mb
Low level cloud: 12%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

8 / 9 mph 60 / 58°F 63% 1017 mb
Low level cloud: 9%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

11 / 13 mph 64 / 63°F 56% 1016 mb
Low level cloud: 76%
Mid level cloud: 11%
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

SSE
SSE

8 / 10 mph 65 / 63°F 58% 1014 mb
Low level cloud: 31%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

4 / 5 mph 65 / 62°F 67% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

2 / 3 mph 50 / 49°F 88% 1012 mb
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 94%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

S
S

5 / 11 mph 48 / 46°F 84% 1011 mb
Low level cloud: 1%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

5 / 7 mph 48 / 46°F 94% 1010 mb
Low level cloud: 79%
Mid level cloud: 100%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

5 / 6 mph 49 / 47°F 99% 1010 mb
Low level cloud: 91%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSE
SSE

5 / 6 mph 51 / 49°F 98% 1010 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSW
SSW

6 / 8 mph 61 / 59°F 83% 1009 mb
Low level cloud: 60%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: low
87%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

6 / 8 mph 62 / 61°F 74% 1008 mb
Low level cloud: 16%
Mid level cloud: 82%
High level cloud: 80%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WSW
WSW

8 / 11 mph 59 / 56°F 81% 1009 mb
Low level cloud: 4%
Mid level cloud: 56%
High level cloud: 98%
Most Significant Cloud Type: medium
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

5 / 11 mph 48 / 45°F 96% 1010 mb
Low level cloud: 10%
Mid level cloud: 27%
High level cloud: 82%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

SW
SW

5 / 11 mph 46 / 43°F 96% 1010 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 72%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

4 / 8 mph 47 / 45°F 96% 1011 mb
Low level cloud: 69%
Mid level cloud: 58%
High level cloud: 78%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

7 / 10 mph 51 / 47°F 91% 1012 mb
Low level cloud: 71%
Mid level cloud: 51%
High level cloud: 4%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

10 / 11 mph 56 / 53°F 66% 1012 mb
Low level cloud: 12%
Mid level cloud: 17%
High level cloud: 8%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

11 / 12 mph 58 / 56°F 54% 1013 mb
Low level cloud: 7%
Mid level cloud: 72%
High level cloud: 3%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

10 / 12 mph 58 / 54°F 58% 1013 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

8 / 9 mph 57 / 54°F 61% 1014 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

4 / 9 mph 45 / 42°F 88% 1016 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
Tue 28
May
00:00

SW
SW

4 / 9 mph 40 / 37°F 93% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

4 / 8 mph 39 / 36°F 93% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

3 / 5 mph 49 / 47°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 34%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

4 / 5 mph 62 / 59°F 56% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

6 / 6 mph 66 / 65°F 49% 1014 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

5 / 6 mph 62 / 59°F 70% 1015 mb
Low level cloud: 25%
Mid level cloud: 44%
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

S
S

4 / 6 mph 56 / 55°F 86% 1015 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

4 / 6 mph 54 / 53°F 90% 1015 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May
00:00

SSE
SSE

4 / 5 mph 56 / 56°F 92% 1015 mb
Low level cloud: 93%
Mid level cloud: 45%
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

S
S

4 / 6 mph 55 / 55°F 95% 1014 mb
Low level cloud: 80%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

6 / 9 mph 54 / 52°F 94% 1013 mb
Low level cloud: 82%
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
09:00

SSE
SSE

6 / 8 mph 57 / 56°F 94% 1013 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

7 / 9 mph 60 / 60°F 89% 1013 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

8 / 9 mph 62 / 62°F 89% 1012 mb
Low level cloud: 87%
Mid level cloud: 44%
High level cloud: 80%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

6 / 7 mph 61 / 61°F 97% 1012 mb
Low level cloud: 62%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

5 / 6 mph 59 / 58°F 98% 1010 mb
Low level cloud: 76%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 30
May
00:00

SW
SW

4 / 6 mph 56 / 56°F 98% 1008 mb
Low level cloud: 98%
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
03:00

WNW
WNW

6 / 9 mph 52 / 50°F 97% 1008 mb
Low level cloud: 80%
Mid level cloud: 69%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

10 / 14 mph 52 / 48°F 92% 1009 mb
Low level cloud: 16%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

15 / 17 mph 57 / 53°F 82% 1011 mb
Low level cloud: 32%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

16 / 19 mph 60 / 56°F 76% 1012 mb
Low level cloud: 67%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

15 / 19 mph 61 / 60°F 78% 1013 mb
Low level cloud: 31%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

13 / 15 mph 60 / 56°F 78% 1014 mb
Low level cloud: 22%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

10 / 14 mph 53 / 48°F 92% 1017 mb
Low level cloud: 54%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 31
May
00:00

SSE
SSE

8 / 17 mph 55 / 53°F 95% 1005 mb
Low level cloud: 13%
Mid level cloud: 51%
High level cloud: 3%
Most Significant Cloud Type: medium
88%
0.0 In
06:00

SSW
SSW

3 / 7 mph 55 / 56°F 95% 1003 mb
Low level cloud: 11%
Mid level cloud: 28%
High level cloud: 6%
Most Significant Cloud Type: low
21%
0.0 In
12:00

WNW
WNW

11 / 24 mph 62 / 62°F 61% 1008 mb
Low level cloud: 64%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: low
80%
0.0 In
18:00

NNW
NNW

11 / 22 mph 59 / 59°F 85% 1018 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
Sat 01
Jun
00:00

NW
NW

17 / 36 mph 47 / 40°F 79% 1011 mb
Low level cloud: 70%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: low
75%
0.0 In
06:00

WNW
WNW

8 / 17 mph 53 / 51°F 88% 1018 mb
Low level cloud: 81%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
12:00

WNW
WNW

11 / 24 mph 59 / 59°F 67% 1023 mb
Low level cloud: 93%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

8 / 17 mph 62 / 62°F 67% 1023 mb
Low level cloud: 15%
Mid level cloud: 32%
High level cloud: 17%
Most Significant Cloud Type: low
27%
0.0 In
Sun 02
Jun
00:00

WSW
WSW

4 / 9 mph 53 / 53°F 86% 1023 mb
Low level cloud: 58%
Mid level cloud: 84%
High level cloud: 32%
Most Significant Cloud Type: low
90%
0.0 In
06:00

W
W

3 / 7 mph 56 / 56°F 82% 1024 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
95%
0.0 In
12:00

WSW
WSW

6 / 12 mph 59 / 58°F 87% 1022 mb
Low level cloud: 97%
Mid level cloud: 60%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

10 / 20 mph 61 / 61°F 73% 1024 mb
Low level cloud: 49%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
Mon 03
Jun
00:00

WNW
WNW

15 / 32 mph 55 / 51°F 91% 1020 mb
Low level cloud: 96%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
98%
0.0 In
06:00

NW
NW

13 / 26 mph 51 / 47°F 89% 1025 mb
Low level cloud: 90%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
12:00

NW
NW

21 / 43 mph 57 / 53°F 54% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

11 / 22 mph 59 / 59°F 79% 1024 mb
Low level cloud: 82%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: low
84%
0.0 In
Tue 04
Jun
00:00

NW
NW

14 / 29 mph 48 / 43°F 86% 1019 mb
Low level cloud: 81%
Mid level cloud: 3%
High level cloud: 94%
Most Significant Cloud Type: low
93%
0.0 In
06:00

WNW
WNW

13 / 26 mph 51 / 47°F 91% 1020 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
12:00

NW
NW

16 / 33 mph 57 / 53°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
45%
0.0 In
18:00

NW
NW

12 / 25 mph 56 / 53°F 69% 1019 mb
Low level cloud: 36%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: low
37%
0.0 In
Wed 05
Jun
00:00

WNW
WNW

9 / 20 mph 46 / 41°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

W
W

13 / 27 mph 51 / 47°F 85% 1016 mb
Low level cloud: 88%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

15 / 31 mph 53 / 49°F 59% 1008 mb
Low level cloud: 85%
Mid level cloud: 66%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

10 / 22 mph 57 / 54°F 62% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 06
Jun
00:00

WNW
WNW

10 / 21 mph 45 / 40°F 94% 1003 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WNW
WNW

7 / 15 mph 51 / 49°F 83% 1021 mb
Low level cloud: 34%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
38%
0.0 In
12:00

SSE
SSE

8 / 17 mph 49 / 46°F 97% 994 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
18:00

W
W

8 / 17 mph 57 / 55°F 75% 1017 mb
Low level cloud: 89%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Fri 07
Jun
00:00

NNW
NNW

8 / 17 mph 46 / 41°F 95% 1004 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.3 In
06:00

NNE
NNE

4 / 8 mph 52 / 51°F 92% 1018 mb
Low level cloud: 39%
Mid level cloud: 1%
High level cloud: 14%
Most Significant Cloud Type: low
40%
0.0 In
12:00

NW
NW

14 / 28 mph 54 / 50°F 80% 1007 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: low
92%
0.0 In
18:00

N
N

3 / 6 mph 57 / 58°F 66% 1018 mb
Low level cloud: 65%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.0 In
Sat 08
Jun
00:00

NNW
NNW

10 / 20 mph 51 / 47°F 97% 1009 mb
Low level cloud: 93%
Mid level cloud: 81%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.2 In
06:00

E
E

1 / 1 mph 49 / 49°F 93% 1017 mb
Low level cloud: 82%
Mid level cloud: 71%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

11 / 22 mph 62 / 62°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 22%
Most Significant Cloud Type: medium
34%
0.1 In
18:00

NNW
NNW

2 / 5 mph 55 / 56°F 82% 1016 mb
Low level cloud: 80%
Mid level cloud: 53%
High level cloud: 12%
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