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Gelyn 14 Day Long Range Forecast

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

Gwynedd, United Kingdom

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

Taking a look at Gelyn over the coming two weeks and the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 18°C expected on the afternoon of Thursday 27th. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Wednesday 26th at 3°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Sunday 23rd will have the most precipitation with an accumulation of around 79.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the afternoon of Sunday 23rd, coming from a northerly direction, and reaching around 35mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 18
Sep
18:00

SW
SW

22 / 29 mph 59 / 55°F 97% 1004 mb
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
21:00

SW
SW

18 / 24 mph 57 / 53°F 97% 1006 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
Wed 19
Sep
00:00

SW
SW

15 / 22 mph 54 / 50°F 96% 1007 mb
Low level cloud: 55%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: low
58%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

SSW
SSW

14 / 22 mph 52 / 48°F 95% 1007 mb
Low level cloud: 45%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
52%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
06:00

SSW
SSW

17 / 26 mph 53 / 49°F 95% 1006 mb
Low level cloud: 90%
Mid level cloud: 24%
High level cloud: 52%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
09:00

SSW
SSW

28 / 36 mph 58 / 53°F 91% 1004 mb
Low level cloud: 92%
Mid level cloud: 32%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

SW
SW

30 / 38 mph 58 / 52°F 96% 1005 mb
Low level cloud: 96%
Mid level cloud: 83%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
15:00

WSW
WSW

23 / 27 mph 56 / 51°F 70% 1007 mb
Low level cloud: 34%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: low
39%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

19 / 27 mph 52 / 46°F 72% 1010 mb
Low level cloud: 37%
Mid level cloud: 26%
High level cloud: 98%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

17 / 24 mph 52 / 46°F 69% 1011 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 49%
Most Significant Cloud Type: low
59%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 20
Sep
00:00

WSW
WSW

13 / 18 mph 48 / 43°F 96% 1011 mb
Low level cloud: 93%
Mid level cloud: 88%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
03:00

WSW
WSW

6 / 7 mph 48 / 45°F 98% 1010 mb
Low level cloud: 94%
Mid level cloud: 84%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
06:00

SW
SW

2 / 3 mph 48 / 47°F 97% 1010 mb
Low level cloud: 76%
Mid level cloud: 70%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
09:00

SW
SW

2 / 3 mph 52 / 52°F 88% 1010 mb
Low level cloud: 36%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
63%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SE
SE

3 / 3 mph 52 / 51°F 90% 1009 mb
Low level cloud: 48%
Mid level cloud: 87%
High level cloud: 99%
Most Significant Cloud Type: low
90%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
15:00

E
E

4 / 5 mph 51 / 50°F 96% 1006 mb
Low level cloud: 74%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
18:00

ESE
ESE

6 / 8 mph 49 / 47°F 98% 1001 mb
Low level cloud: 88%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.34 In of precipitation over the past 3 hours.
0.34 In
21:00

SE
SE

6 / 11 mph 48 / 45°F 99% 996 mb
Low level cloud: 95%
Mid level cloud: 88%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.19 In of precipitation over the past 3 hours.
0.19 In
Fri 21
Sep
00:00

NW
NW

22 / 34 mph 49 / 42°F 95% 995 mb
Low level cloud: 87%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.13 In of precipitation over the past 3 hours.
0.13 In
03:00

WNW
WNW

16 / 21 mph 45 / 38°F 95% 1000 mb
Low level cloud: 91%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
06:00

W
W

14 / 25 mph 43 / 35°F 90% 1003 mb
Low level cloud: 35%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
09:00

W
W

19 / 22 mph 49 / 42°F 81% 1005 mb
Low level cloud: 29%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

W
W

23 / 29 mph 50 / 43°F 77% 1007 mb
Low level cloud: 81%
Mid level cloud: 96%
High level cloud: 65%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
15:00

W
W

20 / 25 mph 52 / 46°F 78% 1010 mb
Low level cloud: 83%
Mid level cloud: 47%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
18:00

W
W

14 / 26 mph 47 / 41°F 86% 1013 mb
Low level cloud: 33%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
21:00

W
W

13 / 24 mph 45 / 38°F 89% 1016 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
Sat 22
Sep
00:00

W
W

12 / 23 mph 44 / 38°F 87% 1017 mb
Low level cloud: 17%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

11 / 21 mph 43 / 37°F 85% 1019 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 61%
Most Significant Cloud Type: low
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

7 / 16 mph 41 / 36°F 85% 1020 mb
Low level cloud: 20%
Mid level cloud: 3%
High level cloud: 31%
Most Significant Cloud Type: low
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

9 / 10 mph 51 / 47°F 72% 1021 mb
Low level cloud: 21%
Mid level cloud: 5%
High level cloud: 37%
Most Significant Cloud Type: low
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

8 / 9 mph 55 / 52°F 63% 1020 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 81%
Most Significant Cloud Type: medium
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSW
SSW

6 / 7 mph 53 / 51°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 79%
High level cloud: 99%
Most Significant Cloud Type: medium
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SE
SE

5 / 7 mph 46 / 44°F 97% 1016 mb
Low level cloud: 46%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
87%
Expect 0.12 In of precipitation over the past 3 hours.
0.12 In
21:00

ESE
ESE

14 / 19 mph 46 / 40°F 97% 1008 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.24 In of precipitation over the past 3 hours.
0.24 In
Sun 23
Sep
00:00

SSE
SSE

15 / 23 mph 52 / 47°F 98% 997 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.61 In of precipitation over the past 3 hours.
0.61 In
03:00

SW
SW

27 / 40 mph 61 / 61°F 98% 987 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 1.95 In of precipitation over the past 3 hours.
1.95 In
06:00

SSW
SSW

20 / 31 mph 54 / 49°F 95% 976 mb
Low level cloud: 94%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.19 In of precipitation over the past 3 hours.
0.19 In
09:00

NW
NW

14 / 18 mph 56 / 53°F 97% 978 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.14 In of precipitation over the past 3 hours.
0.14 In
12:00

N
N

35 / 46 mph 46 / 35°F 91% 993 mb
Low level cloud: 90%
Mid level cloud: 90%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.14 In of precipitation over the past 3 hours.
0.14 In
15:00

NNW
NNW

28 / 42 mph 46 / 36°F 85% 1008 mb
Low level cloud: 78%
Mid level cloud: 74%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
18:00

NNW
NNW

21 / 35 mph 46 / 38°F 71% 1016 mb
Low level cloud: 5%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

NNW
NNW

17 / 30 mph 45 / 38°F 64% 1023 mb
Low level cloud: 9%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 24
Sep
00:00

NNW
NNW

14 / 25 mph 43 / 36°F 65% 1028 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

NNW
NNW

11 / 21 mph 41 / 35°F 72% 1031 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

NNW
NNW

8 / 17 mph 39 / 33°F 79% 1033 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNW
NNW

11 / 12 mph 50 / 46°F 66% 1035 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NW
NW

8 / 10 mph 54 / 51°F 65% 1036 mb
Low level cloud: 37%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

8 / 9 mph 53 / 49°F 74% 1035 mb
Low level cloud: 59%
Mid level cloud: 24%
High level cloud: 6%
Most Significant Cloud Type: low
68%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WNW
WNW

4 / 8 mph 43 / 40°F 85% 1036 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: medium
49%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

3 / 6 mph 38 / 37°F 89% 1037 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 9%
Most Significant Cloud Type: medium
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 25
Sep
00:00

NNW
NNW

2 / 4 mph 40 / 39°F 92% 1037 mb
Low level cloud: 5%
Mid level cloud: 22%
High level cloud: 77%
Most Significant Cloud Type: medium
37%
0.00 In
06:00

ESE
ESE

2 / 3 mph 36 / 36°F 88% 1040 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.00 In
12:00

SSE
SSE

5 / 5 mph 58 / 57°F 52% 1037 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

SW
SW

6 / 7 mph 56 / 55°F 95% 1030 mb
Low level cloud: 37%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.00 In
Wed 26
Sep
00:00

WNW
WNW

14 / 20 mph 50 / 45°F 93% 1019 mb
Low level cloud: 90%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: low
97%
0.17 In
06:00

NNW
NNW

2 / 3 mph 54 / 56°F 99% 1029 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.00 In
12:00

SSW
SSW

7 / 8 mph 60 / 60°F 70% 1030 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
0.00 In
18:00

NNW
NNW

3 / 6 mph 47 / 47°F 91% 1033 mb
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
25%
0.00 In
Thu 27
Sep
00:00

ESE
ESE

4 / 9 mph 41 / 38°F 95% 1033 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
11%
0.00 In
06:00

ENE
ENE

3 / 6 mph 40 / 38°F 89% 1035 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.00 In
12:00

S
S

5 / 6 mph 63 / 63°F 68% 1033 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: low
1%
0.00 In
18:00

NE
NE

3 / 7 mph 53 / 53°F 88% 1035 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.00 In
Fri 28
Sep
00:00

ESE
ESE

5 / 11 mph 43 / 40°F 93% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.00 In
06:00

E
E

2 / 4 mph 47 / 47°F 89% 1035 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.00 In
12:00

SE
SE

12 / 13 mph 60 / 60°F 67% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.00 In
18:00

NNE
NNE

5 / 10 mph 57 / 56°F 92% 1035 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.00 In
Sat 29
Sep
00:00

SE
SE

13 / 25 mph 47 / 42°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
06:00

NE
NE

3 / 7 mph 51 / 50°F 95% 1036 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.00 In
12:00

SSE
SSE

15 / 17 mph 58 / 55°F 72% 1008 mb
Low level cloud: 14%
Mid level cloud: 45%
High level cloud: 72%
Most Significant Cloud Type: medium
87%
0.00 In
18:00

NNE
NNE

6 / 13 mph 55 / 54°F 87% 1035 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
3%
0.00 In
Sun 30
Sep
00:00

SE
SE

13 / 20 mph 47 / 42°F 94% 1001 mb
Low level cloud: 73%
Mid level cloud: 69%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.18 In
06:00

E
E

4 / 9 mph 47 / 46°F 90% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
12:00

SW
SW

6 / 8 mph 55 / 53°F 88% 996 mb
Low level cloud: 35%
Mid level cloud: 21%
High level cloud: 46%
Most Significant Cloud Type: low
48%
0.39 In
18:00

ENE
ENE

6 / 13 mph 54 / 52°F 83% 1033 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.00 In
Mon 01
Oct
00:00

SSW
SSW

10 / 17 mph 46 / 41°F 92% 996 mb
Low level cloud: 46%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.00 In
06:00

ENE
ENE

6 / 12 mph 44 / 40°F 94% 1033 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.00 In
12:00

SW
SW

14 / 18 mph 55 / 51°F 79% 998 mb
Low level cloud: 17%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
32%
0.03 In
18:00

ENE
ENE

6 / 8 mph 55 / 54°F 89% 1032 mb
Low level cloud: 60%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
62%
0.01 In
Tue 02
Oct
00:00

WSW
WSW

9 / 15 mph 46 / 42°F 89% 1000 mb
Low level cloud: 16%
Mid level cloud: 48%
High level cloud: 1%
Most Significant Cloud Type: medium
92%
0.15 In
06:00

ENE
ENE

6 / 11 mph 45 / 42°F 97% 1032 mb
Low level cloud: 63%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.00 In
12:00

WNW
WNW

18 / 31 mph 47 / 40°F 86% 1009 mb
Low level cloud: 44%
Mid level cloud: 26%
High level cloud: 19%
Most Significant Cloud Type: low
55%
0.16 In
18:00

NE
NE

5 / 9 mph 54 / 53°F 93% 1030 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.00 In
Wed 03
Oct
00:00

WNW
WNW

9 / 18 mph 43 / 38°F 83% 1022 mb
Low level cloud: 18%
Mid level cloud: 45%
High level cloud: 44%
Most Significant Cloud Type: low
39%
0.06 In
06:00

ENE
ENE

6 / 10 mph 48 / 46°F 96% 1028 mb
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
69%
0.00 In
12:00

SSE
SSE

9 / 12 mph 47 / 43°F 94% 1021 mb
Low level cloud: 86%
Mid level cloud: 83%
High level cloud: 45%
Most Significant Cloud Type: low
100%
0.13 In
18:00

SSE
SSE

2 / 4 mph 58 / 59°F 84% 1026 mb
Low level cloud: 71%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
71%
0.01 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