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Penmaenan 14 Day Long Range Forecast

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

Gwynedd, United Kingdom

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

Over the next 14 days the Penmaenan forecast suggests the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 14°C expected on the afternoon of Thursday 28th. The average minimum temperature will be 4°C, dipping to its lowest on the morning of Sunday 31st at 1°C. Expect the coming 14 days to have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The indicators are that Saturday 30th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 24
Mar
15:00

W
W

16 / 19 mph 49 / 43°F 70% 1030 mb
Low level cloud: 78%
Mid level cloud: 33%
High level cloud: 2%
Most Significant Cloud Type: low
90%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

15 / 22 mph 47 / 40°F 80% 1029 mb
Low level cloud: 30%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
45%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

WNW
WNW

15 / 25 mph 44 / 37°F 86% 1031 mb
Low level cloud: 66%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
77%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Mon 25
Mar
00:00

NW
NW

15 / 24 mph 43 / 36°F 80% 1032 mb
Low level cloud: 36%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: low
38%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

NW
NW

15 / 23 mph 42 / 35°F 76% 1032 mb
Low level cloud: 69%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNW
NNW

14 / 21 mph 42 / 35°F 73% 1033 mb
Low level cloud: 51%
Mid level cloud: 7%
High level cloud: 13%
Most Significant Cloud Type: low
54%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNW
NNW

13 / 15 mph 47 / 41°F 68% 1035 mb
Low level cloud: 44%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: low
49%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NNW
NNW

9 / 10 mph 49 / 45°F 64% 1035 mb
Low level cloud: 14%
Mid level cloud: 21%
High level cloud: 5%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNW
NNW

8 / 9 mph 50 / 46°F 64% 1035 mb
Low level cloud: 7%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NW
NW

6 / 9 mph 45 / 41°F 77% 1035 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: low
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

5 / 11 mph 39 / 35°F 88% 1037 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 26
Mar
00:00

WSW
WSW

6 / 13 mph 38 / 34°F 89% 1037 mb
Low level cloud: 9%
Mid level cloud: 37%
High level cloud: 91%
Most Significant Cloud Type: medium
65%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

8 / 16 mph 38 / 33°F 90% 1036 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 53%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

9 / 17 mph 40 / 34°F 91% 1036 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

9 / 11 mph 49 / 45°F 81% 1036 mb
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 43%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

10 / 12 mph 53 / 48°F 71% 1035 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

10 / 11 mph 53 / 49°F 67% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

6 / 9 mph 47 / 43°F 81% 1034 mb
Low level cloud: 75%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
75%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

6 / 12 mph 42 / 38°F 91% 1035 mb
Low level cloud: 66%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 27
Mar
00:00

W
W

6 / 14 mph 40 / 36°F 89% 1035 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

7 / 14 mph 39 / 35°F 90% 1035 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

7 / 14 mph 39 / 34°F 92% 1035 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

8 / 9 mph 49 / 46°F 81% 1035 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
36%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

8 / 9 mph 53 / 49°F 72% 1036 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: low
29%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

8 / 9 mph 53 / 50°F 71% 1035 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

5 / 8 mph 47 / 45°F 85% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

5 / 10 mph 40 / 37°F 93% 1037 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 28
Mar
00:00

W
W

5 / 10 mph 40 / 36°F 93% 1038 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

4 / 10 mph 39 / 35°F 92% 1038 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SW
SW

4 / 9 mph 38 / 35°F 92% 1038 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

4 / 4 mph 51 / 49°F 78% 1038 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

4 / 5 mph 58 / 56°F 63% 1037 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

4 / 5 mph 58 / 57°F 65% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SW
SW

5 / 9 mph 49 / 47°F 81% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

9 / 18 mph 41 / 36°F 86% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 29
Mar
00:00

SSW
SSW

10 / 21 mph 42 / 36°F 81% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

11 / 23 mph 42 / 36°F 81% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SW
SW

11 / 22 mph 41 / 35°F 81% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SW
SW

10 / 12 mph 52 / 47°F 72% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SW
SW

11 / 13 mph 56 / 53°F 62% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

12 / 14 mph 56 / 52°F 62% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SW
SW

12 / 18 mph 49 / 44°F 72% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 35%
Most Significant Cloud Type: high
34%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

14 / 23 mph 46 / 40°F 85% 1028 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 81%
Most Significant Cloud Type: high
81%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 30
Mar
00:00

SW
SW

14 / 20 mph 47 / 40°F 91% 1026 mb
Low level cloud: 66%
Mid level cloud: 5%
High level cloud: 88%
Most Significant Cloud Type: low
78%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

11 / 15 mph 48 / 44°F 90% 1025 mb
Low level cloud: 49%
Mid level cloud: 64%
High level cloud: 90%
Most Significant Cloud Type: low
82%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

9 / 17 mph 44 / 39°F 95% 1025 mb
Low level cloud: 74%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

6 / 7 mph 48 / 45°F 93% 1026 mb
Low level cloud: 91%
Mid level cloud: 80%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

N
N

8 / 9 mph 45 / 41°F 92% 1026 mb
Low level cloud: 90%
Mid level cloud: 76%
High level cloud: 77%
Most Significant Cloud Type: low
100%
Expect 0.07 In of precipitation over the past 3 hours.
0.07 In
15:00

NNW
NNW

8 / 10 mph 43 / 39°F 86% 1026 mb
Low level cloud: 73%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
18:00

NNW
NNW

10 / 15 mph 43 / 37°F 76% 1028 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
21:00

NNW
NNW

8 / 17 mph 39 / 33°F 80% 1031 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 31
Mar
00:00

S
S

9 / 18 mph 46 / 42°F 88% 1014 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
11%
0.00 In
06:00

SSW
SSW

8 / 16 mph 46 / 42°F 90% 1017 mb
Low level cloud: 37%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.00 In
12:00

WNW
WNW

8 / 9 mph 48 / 44°F 86% 1016 mb
Low level cloud: 80%
Mid level cloud: 62%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.02 In
18:00

WSW
WSW

10 / 12 mph 53 / 49°F 93% 1018 mb
Low level cloud: 88%
Mid level cloud: 59%
High level cloud: 39%
Most Significant Cloud Type: low
100%
0.01 In
Mon 01
Apr
00:00

NNW
NNW

6 / 11 mph 39 / 35°F 89% 1019 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.00 In
06:00

NNW
NNW

5 / 9 mph 42 / 38°F 93% 1024 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.00 In
12:00

WSW
WSW

19 / 21 mph 50 / 44°F 71% 1026 mb
Low level cloud: 74%
Mid level cloud: 19%
High level cloud: 80%
Most Significant Cloud Type: low
90%
0.01 In
18:00

SW
SW

14 / 16 mph 52 / 47°F 86% 1023 mb
Low level cloud: 64%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: low
67%
0.00 In
Tue 02
Apr
00:00

W
W

17 / 26 mph 45 / 38°F 79% 1024 mb
Low level cloud: 52%
Mid level cloud: 21%
High level cloud: 78%
Most Significant Cloud Type: low
68%
0.01 In
06:00

WSW
WSW

11 / 19 mph 43 / 37°F 89% 1021 mb
Low level cloud: 74%
Mid level cloud: 57%
High level cloud: 68%
Most Significant Cloud Type: low
100%
0.00 In
12:00

WNW
WNW

19 / 22 mph 51 / 45°F 72% 1024 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
59%
0.01 In
18:00

SW
SW

14 / 18 mph 50 / 45°F 80% 1016 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.00 In
Wed 03
Apr
00:00

WSW
WSW

6 / 12 mph 40 / 36°F 92% 1030 mb
Low level cloud: 36%
Mid level cloud: 4%
High level cloud: 39%
Most Significant Cloud Type: low
42%
0.00 In
06:00

SW
SW

15 / 21 mph 46 / 40°F 85% 1010 mb
Low level cloud: 46%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.00 In
12:00

SW
SW

9 / 11 mph 53 / 50°F 69% 1030 mb
Low level cloud: 64%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.00 In
18:00

W
W

11 / 15 mph 53 / 49°F 85% 1006 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 57%
Most Significant Cloud Type: low
80%
0.06 In
Thu 04
Apr
00:00

SSW
SSW

12 / 21 mph 42 / 36°F 92% 1029 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
23%
0.00 In
06:00

WSW
WSW

14 / 20 mph 40 / 32°F 70% 1008 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
0.00 In
12:00

S
S

10 / 12 mph 59 / 57°F 55% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

WSW
WSW

11 / 15 mph 46 / 41°F 68% 1010 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
0.03 In
Fri 05
Apr
00:00

SSE
SSE

12 / 21 mph 43 / 36°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
0.00 In
06:00

NW
NW

6 / 10 mph 37 / 33°F 86% 1016 mb
Low level cloud: 57%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.05 In
12:00

SW
SW

9 / 11 mph 50 / 47°F 89% 1009 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
77%
0.03 In
18:00

SW
SW

13 / 16 mph 45 / 38°F 62% 1012 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 48%
Most Significant Cloud Type: medium
50%
0.01 In
Sat 06
Apr
00:00

SW
SW

9 / 16 mph 38 / 31°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.09 In
06:00

W
W

17 / 27 mph 40 / 32°F 81% 1006 mb
Low level cloud: 19%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.07 In
12:00

WNW
WNW

13 / 17 mph 46 / 40°F 60% 1010 mb
Low level cloud: 21%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.18 In
18:00

W
W

22 / 35 mph 43 / 34°F 73% 1006 mb
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.13 In
Sun 07
Apr
00:00

SSW
SSW

6 / 12 mph 34 / 28°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 80%
Most Significant Cloud Type: medium
30%
0.01 In
06:00

W
W

20 / 25 mph 42 / 33°F 74% 1011 mb
Low level cloud: 33%
Mid level cloud: 15%
High level cloud: 42%
Most Significant Cloud Type: low
43%
0.01 In
12:00

NW
NW

4 / 6 mph 48 / 46°F 66% 1009 mb
Low level cloud: 25%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.04 In
18:00

SW
SW

19 / 26 mph 51 / 44°F 94% 1008 mb
Low level cloud: 74%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
90%
0.14 In
Mon 08
Apr
00:00

SW
SW

6 / 13 mph 35 / 29°F 80% 1008 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
69%
0.01 In
06:00

SW
SW

17 / 22 mph 53 / 48°F 94% 1004 mb
Low level cloud: 59%
Mid level cloud: 38%
High level cloud: 10%
Most Significant Cloud Type: low
73%
0.07 In
12:00

SE
SE

9 / 11 mph 47 / 43°F 84% 1000 mb
Low level cloud: 60%
Mid level cloud: 59%
High level cloud: 6%
Most Significant Cloud Type: low
81%
0.20 In
18:00

SW
SW

23 / 30 mph 50 / 43°F 67% 1002 mb
Low level cloud: 8%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
0.07 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