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Pencuke 14 Day Long Range Forecast

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

Cornwall, United Kingdom

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

For Pencuke in the coming two weeks 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 Thursday 30th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 28th at 7°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Friday 31st will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May
15:00

NW
NW

11 / 13 mph 59 / 56°F 88% 1011 mb
Low level cloud: 58%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

5 / 6 mph 58 / 57°F 90% 1012 mb
Low level cloud: 94%
Mid level cloud: 24%
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

WNW
WNW

8 / 15 mph 57 / 54°F 88% 1013 mb
Low level cloud: 34%
Mid level cloud: 39%
High level cloud: 13%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

NNW
NNW

15 / 24 mph 53 / 49°F 91% 1014 mb
Low level cloud: 39%
Mid level cloud: 22%
High level cloud: 16%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

18 / 28 mph 52 / 46°F 86% 1015 mb
Low level cloud: 91%
Mid level cloud: 23%
High level cloud: 9%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

16 / 24 mph 50 / 45°F 78% 1016 mb
Low level cloud: 93%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

15 / 17 mph 54 / 49°F 75% 1018 mb
Low level cloud: 91%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

15 / 17 mph 58 / 54°F 68% 1018 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

13 / 15 mph 61 / 59°F 67% 1018 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

13 / 15 mph 58 / 55°F 68% 1018 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

12 / 15 mph 55 / 51°F 74% 1019 mb
Low level cloud: 83%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

NW
NW

9 / 17 mph 50 / 47°F 75% 1019 mb
Low level cloud: 51%
Mid level cloud: 18%
High level cloud: 36%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

9 / 19 mph 49 / 45°F 76% 1019 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

9 / 19 mph 48 / 44°F 79% 1019 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

8 / 14 mph 52 / 48°F 71% 1020 mb
Low level cloud: 8%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

7 / 9 mph 54 / 52°F 69% 1020 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 91%
Most Significant Cloud Type: high
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

6 / 7 mph 57 / 54°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

4 / 4 mph 56 / 55°F 71% 1020 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
21:00

ENE
ENE

3 / 3 mph 55 / 54°F 78% 1020 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
Sat 25
May
00:00

ESE
ESE

5 / 9 mph 49 / 47°F 79% 1020 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

6 / 12 mph 46 / 44°F 78% 1018 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

6 / 12 mph 48 / 45°F 84% 1018 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
09:00

SSE
SSE

12 / 14 mph 61 / 59°F 72% 1018 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

14 / 16 mph 62 / 62°F 74% 1018 mb
Low level cloud: 69%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

13 / 15 mph 64 / 63°F 71% 1017 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

13 / 15 mph 63 / 62°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 96%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

13 / 15 mph 59 / 56°F 82% 1016 mb
Low level cloud: 6%
Mid level cloud: 62%
High level cloud: 50%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

SE
SE

13 / 18 mph 55 / 52°F 85% 1015 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 27%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

11 / 19 mph 54 / 50°F 88% 1014 mb
Low level cloud: 7%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

13 / 26 mph 54 / 48°F 90% 1014 mb
Low level cloud: 27%
Mid level cloud: 47%
High level cloud: 96%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

15 / 26 mph 57 / 52°F 87% 1013 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 23 mph 60 / 59°F 85% 1014 mb
Low level cloud: 12%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

W
W

17 / 21 mph 62 / 61°F 83% 1015 mb
Low level cloud: 41%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

15 / 17 mph 60 / 59°F 82% 1016 mb
Low level cloud: 19%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

13 / 15 mph 58 / 54°F 89% 1018 mb
Low level cloud: 44%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

W
W

14 / 26 mph 52 / 47°F 85% 1018 mb
Low level cloud: 28%
Mid level cloud: 15%
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

W
W

15 / 28 mph 51 / 46°F 83% 1019 mb
Low level cloud: 35%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

14 / 30 mph 50 / 45°F 83% 1020 mb
Low level cloud: 46%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

15 / 25 mph 53 / 48°F 79% 1021 mb
Low level cloud: 37%
Mid level cloud: 31%
High level cloud: 6%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

12 / 16 mph 55 / 52°F 66% 1022 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

9 / 11 mph 58 / 54°F 68% 1022 mb
Low level cloud: 49%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

10 / 13 mph 56 / 52°F 76% 1022 mb
Low level cloud: 50%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

6 / 10 mph 55 / 51°F 76% 1023 mb
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
00:00

SSW
SSW

6 / 12 mph 48 / 46°F 78% 1022 mb
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

8 / 16 mph 46 / 42°F 83% 1022 mb
Low level cloud: 14%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

8 / 15 mph 49 / 45°F 81% 1021 mb
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

13 / 15 mph 60 / 56°F 75% 1020 mb
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

15 / 17 mph 64 / 64°F 72% 1019 mb
Low level cloud: 73%
Mid level cloud: 42%
High level cloud: 6%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

15 / 17 mph 65 / 64°F 75% 1018 mb
Low level cloud: 45%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

15 / 17 mph 59 / 59°F 83% 1016 mb
Low level cloud: 59%
Mid level cloud: 93%
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

16 / 19 mph 58 / 54°F 90% 1016 mb
Low level cloud: 96%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 29
May
00:00

N
N

4 / 9 mph 55 / 55°F 90% 1026 mb
Low level cloud: 13%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
25%
0.0 In
06:00

SSE
SSE

8 / 16 mph 51 / 47°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
12:00

NNW
NNW

2 / 5 mph 55 / 56°F 93% 1011 mb
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

13 / 28 mph 58 / 55°F 96% 1011 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
Thu 30
May
00:00

SSW
SSW

19 / 38 mph 53 / 48°F 92% 1013 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

6 / 11 mph 52 / 50°F 84% 1011 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
12:00

NW
NW

10 / 21 mph 56 / 53°F 78% 1015 mb
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
18:00

SSE
SSE

16 / 34 mph 60 / 60°F 89% 1004 mb
Low level cloud: 66%
Mid level cloud: 44%
High level cloud: 86%
Most Significant Cloud Type: low
91%
0.0 In
Fri 31
May
00:00

SSW
SSW

5 / 10 mph 52 / 51°F 73% 1013 mb
Low level cloud: 38%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.0 In
06:00

SE
SE

8 / 17 mph 53 / 51°F 92% 1003 mb
Low level cloud: 37%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.0 In
12:00

SW
SW

14 / 29 mph 55 / 51°F 80% 1012 mb
Low level cloud: 30%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.1 In
18:00

SSE
SSE

9 / 19 mph 58 / 56°F 82% 1002 mb
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 93%
Most Significant Cloud Type: low
36%
0.4 In
Sat 01
Jun
00:00

SSE
SSE

5 / 11 mph 52 / 51°F 85% 1011 mb
Low level cloud: 13%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: low
21%
0.1 In
06:00

ESE
ESE

21 / 44 mph 53 / 47°F 90% 1000 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

4 / 7 mph 57 / 57°F 78% 1010 mb
Low level cloud: 60%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSE
SSE

26 / 55 mph 56 / 51°F 77% 1005 mb
Low level cloud: 19%
Mid level cloud: 44%
High level cloud: 18%
Most Significant Cloud Type: low
36%
0.1 In
Sun 02
Jun
00:00

N
N

3 / 6 mph 52 / 52°F 87% 1009 mb
Low level cloud: 63%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.4 In
06:00

SSE
SSE

15 / 33 mph 51 / 46°F 80% 1010 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 41%
Most Significant Cloud Type: low
16%
0.0 In
12:00

NNE
NNE

17 / 36 mph 52 / 47°F 86% 1011 mb
Low level cloud: 87%
Mid level cloud: 61%
High level cloud: 79%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSE
SSE

16 / 33 mph 56 / 52°F 84% 1014 mb
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 32%
Most Significant Cloud Type: low
19%
0.1 In
Mon 03
Jun
00:00

NNW
NNW

12 / 25 mph 54 / 50°F 86% 1014 mb
Low level cloud: 24%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
06:00

SE
SE

8 / 17 mph 51 / 49°F 90% 1014 mb
Low level cloud: 48%
Mid level cloud: 86%
High level cloud: 2%
Most Significant Cloud Type: low
78%
0.0 In
12:00

WSW
WSW

13 / 26 mph 58 / 55°F 78% 1014 mb
Low level cloud: 50%
Mid level cloud: 5%
High level cloud: 61%
Most Significant Cloud Type: low
58%
0.0 In
18:00

S
S

12 / 24 mph 58 / 55°F 77% 1015 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: medium
55%
0.1 In
Tue 04
Jun
00:00

WNW
WNW

22 / 47 mph 52 / 46°F 93% 1009 mb
Low level cloud: 96%
Mid level cloud: 54%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

8 / 17 mph 51 / 48°F 88% 1014 mb
Low level cloud: 5%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
0.0 In
12:00

W
W

24 / 51 mph 56 / 50°F 73% 1013 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.1 In
18:00

SSW
SSW

11 / 23 mph 58 / 55°F 87% 1015 mb
Low level cloud: 28%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
53%
0.2 In
Wed 05
Jun
00:00

W
W

22 / 47 mph 51 / 44°F 78% 1012 mb
Low level cloud: 33%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.2 In
06:00

SSE
SSE

17 / 36 mph 55 / 50°F 95% 1012 mb
Low level cloud: 98%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
12:00

WNW
WNW

12 / 26 mph 54 / 50°F 75% 1011 mb
Low level cloud: 45%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.2 In
18:00

SW
SW

13 / 27 mph 59 / 59°F 87% 1014 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
47%
0.2 In
Thu 06
Jun
00:00

NNW
NNW

6 / 12 mph 52 / 51°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

SSW
SSW

4 / 8 mph 57 / 57°F 97% 1014 mb
Low level cloud: 100%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

NNW
NNW

10 / 21 mph 56 / 54°F 78% 1020 mb
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 30%
Most Significant Cloud Type: low
17%
0.0 In
18:00

SSW
SSW

7 / 16 mph 60 / 60°F 84% 1016 mb
Low level cloud: 1%
Mid level cloud: 28%
High level cloud: 39%
Most Significant Cloud Type: medium
32%
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