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Gigg 14 Day Long Range Forecast

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

Lancashire, United Kingdom

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

The outlook for Gigg in the two weeks ahead shows the average daytime maximum temperature will be around 4°C, with a high for the two weeks of 10°C expected on the evening of Thursday 8th. The average minimum temperature will be 0°C, dipping to its lowest on the morning of Monday 5th at -3°C. Expect the following 14 days ahead to remain predominantly dry. On the whole winds are likely to be moderate. Expect the strongest wind on the morning of Friday 9th, coming from a south westerly direction, and reaching around 38mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 01
Jan
15:00

NW
NW

17 / 20 mph 45 / 37°F 69% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 30%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

14 / 16 mph 43 / 36°F 69% 1008 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 61%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

16 / 18 mph 41 / 33°F 64% 1007 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 12%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 02
Jan
00:00

NW
NW

15 / 27 mph 34 / 24°F 59% 1007 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

13 / 22 mph 33 / 23°F 60% 1007 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

11 / 17 mph 32 / 23°F 62% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

16 / 24 mph 34 / 24°F 56% 1007 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

13 / 17 mph 37 / 29°F 61% 1007 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

9 / 11 mph 38 / 32°F 68% 1008 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

5 / 6 mph 37 / 33°F 79% 1009 mb
Low level cloud: 25%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

10 / 12 mph 36 / 29°F 62% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 03
Jan
00:00

NW
NW

11 / 15 mph 32 / 24°F 61% 1011 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

12 / 18 mph 30 / 21°F 56% 1011 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

12 / 18 mph 30 / 20°F 55% 1012 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

13 / 18 mph 32 / 22°F 53% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

13 / 18 mph 34 / 25°F 51% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

14 / 16 mph 35 / 26°F 49% 1014 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
18:00

NW
NW

9 / 11 mph 35 / 28°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
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

NW
NW

9 / 10 mph 33 / 26°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 04
Jan
00:00

NW
NW

9 / 12 mph 32 / 25°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

9 / 14 mph 31 / 23°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

9 / 16 mph 30 / 22°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

7 / 11 mph 31 / 25°F 58% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

10 / 14 mph 34 / 26°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 13%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

10 / 13 mph 35 / 28°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

5 / 6 mph 35 / 31°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 8 mph 33 / 28°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 05
Jan
00:00

W
W

3 / 6 mph 29 / 26°F 73% 1016 mb
Low level cloud: 20%
Mid level cloud: 44%
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

NNW
NNW

4 / 8 mph 28 / 24°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

4 / 7 mph 27 / 23°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

3 / 6 mph 29 / 26°F 65% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

4 / 6 mph 32 / 28°F 47% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

3 / 5 mph 33 / 30°F 52% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

3 / 3 mph 33 / 31°F 59% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

2 / 4 mph 31 / 30°F 58% 1024 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 06
Jan
00:00

NW
NW

2 / 4 mph 30 / 28°F 61% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 9%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

2 / 3 mph 28 / 28°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 11%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

1 / 2 mph 27 / 27°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 20%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

2 / 4 mph 29 / 28°F 69% 1026 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 19%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

2 / 4 mph 32 / 30°F 67% 1026 mb
Low level cloud: 9%
Mid level cloud: 14%
High level cloud: 43%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

3 / 5 mph 33 / 31°F 80% 1026 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 12%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

2 / 4 mph 33 / 31°F 89% 1026 mb
Low level cloud: 45%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

3 / 6 mph 30 / 27°F 92% 1027 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 07
Jan
00:00

SSW
SSW

4 / 6 mph 32 / 28°F 93% 1027 mb
Low level cloud: 14%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

4 / 8 mph 30 / 26°F 85% 1027 mb
Low level cloud: 88%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

4 / 9 mph 29 / 24°F 81% 1026 mb
Low level cloud: 96%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

5 / 9 mph 32 / 27°F 90% 1025 mb
Low level cloud: 96%
Mid level cloud: 27%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

5 / 9 mph 36 / 31°F 97% 1024 mb
Low level cloud: 97%
Mid level cloud: 47%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

6 / 11 mph 37 / 32°F 99% 1021 mb
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 55%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

8 / 14 mph 36 / 30°F 98% 1020 mb
Low level cloud: 99%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

6 / 13 mph 33 / 28°F 99% 1017 mb
Low level cloud: 100%
Mid level cloud: 63%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 08
Jan
00:00

WNW
WNW

11 / 17 mph 47 / 42°F 95% 1020 mb
Low level cloud: 89%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
95%
0.0 In
06:00

W
W

25 / 43 mph 48 / 40°F 93% 1012 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

27 / 40 mph 43 / 32°F 80% 997 mb
Low level cloud: 11%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: medium
87%
0.0 In
18:00

WSW
WSW

11 / 17 mph 48 / 43°F 97% 1010 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 09
Jan
00:00

WSW
WSW

4 / 5 mph 43 / 41°F 99% 1011 mb
Low level cloud: 89%
Mid level cloud: 58%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

17 / 28 mph 39 / 29°F 83% 1002 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

15 / 30 mph 38 / 30°F 73% 1008 mb
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
0.0 In
18:00

WNW
WNW

18 / 31 mph 41 / 32°F 81% 1003 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.0 In
Sat 10
Jan
00:00

W
W

10 / 21 mph 37 / 29°F 88% 1006 mb
Low level cloud: 23%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.1 In
06:00

W
W

3 / 6 mph 34 / 32°F 85% 1004 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.1 In
12:00

WNW
WNW

11 / 23 mph 38 / 31°F 77% 1010 mb
Low level cloud: 3%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.0 In
18:00

NW
NW

9 / 17 mph 39 / 33°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.1 In
Sun 11
Jan
00:00

WNW
WNW

9 / 19 mph 38 / 32°F 89% 1014 mb
Low level cloud: 20%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
26%
0.1 In
06:00

SW
SW

3 / 6 mph 37 / 35°F 88% 1019 mb
Low level cloud: 10%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: low
15%
0.0 In
12:00

SSE
SSE

6 / 12 mph 39 / 34°F 87% 1013 mb
Low level cloud: 20%
Mid level cloud: 82%
High level cloud: 94%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

SW
SW

13 / 25 mph 42 / 35°F 88% 1009 mb
Low level cloud: 99%
Mid level cloud: 58%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
Mon 12
Jan
00:00

SW
SW

16 / 34 mph 41 / 33°F 88% 991 mb
Low level cloud: 92%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
06:00

WSW
WSW

12 / 24 mph 43 / 36°F 98% 996 mb
Low level cloud: 99%
Mid level cloud: 88%
High level cloud: 53%
Most Significant Cloud Type: low
100%
0.4 In
12:00

WSW
WSW

21 / 45 mph 44 / 35°F 68% 989 mb
Low level cloud: 56%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.1 In
18:00

W
W

13 / 25 mph 49 / 44°F 92% 996 mb
Low level cloud: 82%
Mid level cloud: 88%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.6 In
Tue 13
Jan
00:00

WSW
WSW

20 / 42 mph 40 / 31°F 76% 993 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WNW
WNW

9 / 18 mph 39 / 33°F 89% 1008 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
12:00

WSW
WSW

19 / 40 mph 43 / 34°F 70% 997 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNW
NNW

2 / 3 mph 52 / 52°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
0.0 In
Wed 14
Jan
00:00

W
W

5 / 11 mph 46 / 43°F 87% 1004 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
27%
0.0 In
06:00

ESE
ESE

4 / 8 mph 37 / 35°F 81% 1022 mb
Low level cloud: 18%
Mid level cloud: 47%
High level cloud: 98%
Most Significant Cloud Type: low
46%
0.0 In
12:00

NE
NE

4 / 9 mph 47 / 45°F 83% 999 mb
Low level cloud: 39%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
85%
0.0 In
18:00

SSE
SSE

8 / 17 mph 42 / 37°F 93% 1017 mb
Low level cloud: 53%
Mid level cloud: 95%
High level cloud: 93%
Most Significant Cloud Type: low
97%
0.0 In
Thu 15
Jan
00:00

NE
NE

18 / 39 mph 36 / 25°F 89% 997 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SW
SW

4 / 9 mph 43 / 40°F 99% 1015 mb
Low level cloud: 97%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
12:00

N
N

17 / 36 mph 40 / 31°F 67% 1014 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
18:00

S
S

3 / 5 mph 49 / 49°F 97% 1019 mb
Low level cloud: 63%
Mid level cloud: 67%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
Fri 16
Jan
00:00

N
N

3 / 7 mph 44 / 42°F 84% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
0.0 In
06:00

SSW
SSW

13 / 27 mph 43 / 36°F 94% 1010 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.3 In
12:00

SSE
SSE

7 / 15 mph 39 / 34°F 68% 1029 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

S
S

5 / 10 mph 52 / 51°F 98% 1011 mb
Low level cloud: 84%
Mid level cloud: 35%
High level cloud: 85%
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