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Hetherson Green 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Hetherson Green

Cheshire, United Kingdom

Long range weather outlook for Hetherson Green includes 14 day forecast summary:

The outlook for Hetherson Green in the two weeks ahead shows the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 17°C expected on the afternoon of Sunday 9th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 6th at 5°C. Expect the following 14 days ahead to remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun
15:00

NNE
NNE

9 / 11 mph 63 / 60°F 76% 1028 mb
Low level cloud: 61%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

8 / 9 mph 62 / 60°F 80% 1029 mb
Low level cloud: 15%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

6 / 12 mph 54 / 51°F 94% 1030 mb
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Jun
00:00

NW
NW

6 / 11 mph 50 / 47°F 97% 1030 mb
Low level cloud: 29%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 11 mph 48 / 46°F 96% 1029 mb
Low level cloud: 21%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

7 / 10 mph 53 / 49°F 91% 1029 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

12 / 13 mph 58 / 55°F 70% 1029 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
12:00

NW
NW

13 / 15 mph 63 / 61°F 71% 1028 mb
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

15 / 17 mph 62 / 62°F 76% 1027 mb
Low level cloud: 76%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

13 / 15 mph 61 / 59°F 85% 1027 mb
Low level cloud: 55%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

6 / 12 mph 53 / 50°F 94% 1027 mb
Low level cloud: 72%
Mid level cloud: 14%
High level cloud: 75%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun
00:00

WNW
WNW

7 / 10 mph 54 / 52°F 88% 1025 mb
Low level cloud: 91%
Mid level cloud: 23%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

6 / 11 mph 52 / 50°F 97% 1024 mb
Low level cloud: 76%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

8 / 12 mph 55 / 53°F 93% 1023 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

11 / 13 mph 59 / 56°F 86% 1022 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

11 / 13 mph 59 / 57°F 85% 1021 mb
Low level cloud: 90%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

11 / 13 mph 58 / 55°F 88% 1021 mb
Low level cloud: 81%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

10 / 13 mph 58 / 56°F 87% 1019 mb
Low level cloud: 84%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

3 / 5 mph 56 / 57°F 91% 1018 mb
Low level cloud: 97%
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
Tue 04
Jun
00:00

SSW
SSW

7 / 12 mph 55 / 53°F 85% 1015 mb
Low level cloud: 93%
Mid level cloud: 30%
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

SW
SW

10 / 15 mph 55 / 52°F 88% 1012 mb
Low level cloud: 45%
Mid level cloud: 83%
High level cloud: 32%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

10 / 15 mph 57 / 53°F 91% 1011 mb
Low level cloud: 51%
Mid level cloud: 18%
High level cloud: 18%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

11 / 16 mph 56 / 52°F 82% 1010 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

15 / 18 mph 55 / 51°F 87% 1010 mb
Low level cloud: 68%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

14 / 18 mph 55 / 51°F 69% 1011 mb
Low level cloud: 2%
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
18:00

WNW
WNW

11 / 16 mph 55 / 51°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

5 / 10 mph 50 / 47°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 05
Jun
00:00

WSW
WSW

7 / 15 mph 43 / 39°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

6 / 13 mph 44 / 40°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

8 / 11 mph 47 / 42°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

11 / 13 mph 54 / 50°F 60% 1015 mb
Low level cloud: 61%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

11 / 14 mph 56 / 52°F 66% 1015 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

15 / 17 mph 56 / 52°F 64% 1015 mb
Low level cloud: 42%
Mid level cloud: 63%
High level cloud: 97%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

11 / 15 mph 55 / 51°F 70% 1016 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 54%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

7 / 14 mph 48 / 44°F 80% 1017 mb
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 44%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Jun
00:00

WSW
WSW

8 / 16 mph 43 / 38°F 90% 1017 mb
Low level cloud: 24%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

6 / 13 mph 42 / 38°F 95% 1018 mb
Low level cloud: 22%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

9 / 12 mph 48 / 43°F 87% 1018 mb
Low level cloud: 15%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

14 / 16 mph 55 / 50°F 70% 1019 mb
Low level cloud: 52%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

13 / 16 mph 56 / 52°F 65% 1019 mb
Low level cloud: 67%
Mid level cloud: 51%
High level cloud: 7%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

15 / 18 mph 57 / 53°F 61% 1019 mb
Low level cloud: 26%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

12 / 16 mph 55 / 51°F 75% 1019 mb
Low level cloud: 38%
Mid level cloud: 42%
High level cloud: 4%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

7 / 15 mph 47 / 42°F 87% 1020 mb
Low level cloud: 42%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Jun
00:00

WSW
WSW

7 / 12 mph 49 / 46°F 80% 1020 mb
Low level cloud: 25%
Mid level cloud: 41%
High level cloud: 6%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

6 / 13 mph 44 / 40°F 93% 1020 mb
Low level cloud: 26%
Mid level cloud: 21%
High level cloud: 2%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

5 / 7 mph 50 / 47°F 86% 1020 mb
Low level cloud: 39%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

8 / 9 mph 55 / 52°F 77% 1020 mb
Low level cloud: 82%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

12 / 14 mph 60 / 56°F 60% 1020 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

12 / 14 mph 58 / 54°F 60% 1020 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

9 / 11 mph 58 / 55°F 68% 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

W
W

4 / 7 mph 53 / 51°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 08
Jun
00:00

W
W

4 / 8 mph 47 / 46°F 92% 1015 mb
Low level cloud: 24%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
06:00

NNW
NNW

11 / 21 mph 47 / 42°F 97% 1009 mb
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

7 / 12 mph 65 / 65°F 62% 1019 mb
Low level cloud: 23%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: low
25%
0.0 In
18:00

NW
NW

8 / 12 mph 67 / 67°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 09
Jun
00:00

E
E

8 / 12 mph 54 / 52°F 81% 1020 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
77%
0.0 In
06:00

SE
SE

6 / 9 mph 56 / 55°F 89% 1021 mb
Low level cloud: 34%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: low
39%
0.0 In
12:00

SE
SE

7 / 12 mph 67 / 67°F 65% 1024 mb
Low level cloud: 15%
Mid level cloud: 23%
High level cloud: 47%
Most Significant Cloud Type: low
28%
0.0 In
18:00

NNW
NNW

4 / 7 mph 64 / 64°F 78% 1015 mb
Low level cloud: 52%
Mid level cloud: 29%
High level cloud: 5%
Most Significant Cloud Type: low
62%
0.0 In
Mon 10
Jun
00:00

SE
SE

7 / 13 mph 57 / 56°F 94% 1021 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
47%
0.0 In
06:00

WNW
WNW

11 / 18 mph 49 / 44°F 91% 1009 mb
Low level cloud: 72%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.1 In
12:00

SSE
SSE

8 / 13 mph 70 / 70°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
20%
0.0 In
18:00

NNW
NNW

12 / 22 mph 54 / 51°F 81% 1013 mb
Low level cloud: 36%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
Tue 11
Jun
00:00

SE
SE

8 / 15 mph 59 / 57°F 94% 1016 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
21%
0.0 In
06:00

NW
NW

8 / 14 mph 50 / 47°F 83% 1016 mb
Low level cloud: 11%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
12:00

SSE
SSE

16 / 26 mph 74 / 77°F 64% 1011 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 78%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

NNW
NNW

10 / 20 mph 59 / 57°F 81% 1020 mb
Low level cloud: 54%
Mid level cloud: 13%
High level cloud: 5%
Most Significant Cloud Type: low
58%
0.1 In
Wed 12
Jun
00:00

SSE
SSE

10 / 17 mph 66 / 66°F 92% 1008 mb
Low level cloud: 72%
Mid level cloud: 32%
High level cloud: 95%
Most Significant Cloud Type: low
94%
0.0 In
06:00

WNW
WNW

8 / 15 mph 51 / 48°F 92% 1022 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
55%
0.0 In
12:00

NW
NW

11 / 19 mph 65 / 65°F 61% 1015 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
1%
0.0 In
18:00

NW
NW

10 / 20 mph 59 / 57°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
0.0 In
Thu 13
Jun
00:00

SSW
SSW

2 / 4 mph 58 / 59°F 82% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

5 / 10 mph 52 / 51°F 90% 1022 mb
Low level cloud: 88%
Mid level cloud: 3%
High level cloud: 44%
Most Significant Cloud Type: low
94%
0.0 In
12:00

SSW
SSW

8 / 14 mph 68 / 68°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
16%
0.0 In
18:00

WNW
WNW

1 / 3 mph 65 / 65°F 75% 1020 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 79%
Most Significant Cloud Type: low
30%
0.0 In
Fri 14
Jun
00:00

N
N

4 / 7 mph 55 / 55°F 82% 1014 mb
Low level cloud: 66%
Mid level cloud: 53%
High level cloud: 82%
Most Significant Cloud Type: low
93%
0.0 In
06:00

WNW
WNW

10 / 20 mph 50 / 46°F 89% 1017 mb
Low level cloud: 31%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
12:00

NW
NW

5 / 9 mph 67 / 67°F 72% 1013 mb
Low level cloud: 77%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
92%
0.0 In
18:00

NNW
NNW

9 / 19 mph 60 / 60°F 79% 1015 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
Sat 15
Jun
00:00

NNW
NNW

5 / 10 mph 58 / 57°F 81% 1013 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 98%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

WSW
WSW

2 / 5 mph 55 / 56°F 87% 1016 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 49%
Most Significant Cloud Type: medium
26%
0.0 In
12:00

WSW
WSW

6 / 11 mph 68 / 68°F 64% 1012 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: low
34%
0.0 In
18:00

WSW
WSW

5 / 10 mph 64 / 64°F 84% 1014 mb
Low level cloud: 32%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
53%
0.1 In
Sun 16
Jun
00:00

SSW
SSW

9 / 16 mph 59 / 59°F 92% 1011 mb
Low level cloud: 86%
Mid level cloud: 45%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

11 / 22 mph 50 / 46°F 92% 1014 mb
Low level cloud: 23%
Mid level cloud: 87%
High level cloud: 55%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SSW
SSW

13 / 25 mph 62 / 62°F 92% 1008 mb
Low level cloud: 90%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSW
SSW

13 / 27 mph 56 / 53°F 91% 1014 mb
Low level cloud: 93%
Mid level cloud: 26%
High level cloud: 9%
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