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Ashton upon Mersey 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ashton upon Mersey

Trafford, United Kingdom

Long range weather outlook for Ashton upon Mersey includes 14 day forecast summary:

Over the next 14 days the Ashton upon Mersey forecast suggests the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 11°C expected on the afternoon of Monday 15th. The mean minimum temperature will be 5°C, dipping to its lowest on the morning of Sunday 21st at 3°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Monday 15th will have the most precipitation with an accumulation of around 25.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 13
Dec		18:00

SSW
SSW

 15 / 21 mph 47 / 41°F 80% 1020 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 15 / 24 mph 46 / 40°F 79% 1019 mb
Low level cloud: 31%
Mid level cloud: 97%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Dec		00:00

SSW
SSW

 15 / 23 mph 48 / 42°F 77% 1018 mb
Low level cloud: 71%
Mid level cloud: 73%
High level cloud: 6%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 14 / 24 mph 47 / 41°F 77% 1016 mb
Low level cloud: 56%
Mid level cloud: 73%
High level cloud: 8%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 13 / 23 mph 46 / 40°F 81% 1015 mb
Low level cloud: 83%
Mid level cloud: 93%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 13 / 21 mph 48 / 42°F 81% 1014 mb
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 14 / 17 mph 50 / 45°F 82% 1012 mb
Low level cloud: 59%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

S
S

 15 / 19 mph 51 / 46°F 68% 1009 mb
Low level cloud: 4%
Mid level cloud: 87%
High level cloud: 14%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 15 / 23 mph 50 / 44°F 69% 1006 mb
Low level cloud: 98%
Mid level cloud: 88%
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

S
S

 16 / 29 mph 48 / 42°F 74% 1005 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec		00:00

S
S

 15 / 30 mph 48 / 41°F 81% 1003 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

S
S

 13 / 28 mph 46 / 40°F 85% 1002 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 90%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

S
S

 11 / 22 mph 46 / 40°F 95% 1001 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

S
S

 10 / 19 mph 48 / 43°F 95% 1001 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

SSW
SSW

 9 / 13 mph 50 / 46°F 94% 1001 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

 4 / 4 mph 51 / 50°F 95% 1001 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
18:00

WNW
WNW

 4 / 4 mph 50 / 49°F 92% 1002 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NW
NW

 4 / 4 mph 49 / 47°F 94% 1003 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 16
Dec		00:00

WNW
WNW

 5 / 10 mph 42 / 39°F 91% 1005 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

W
W

 3 / 6 mph 41 / 39°F 90% 1007 mb
Low level cloud: 11%
Mid level cloud: 98%
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

WNW
WNW

 3 / 6 mph 40 / 38°F 87% 1009 mb
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 2 / 3 mph 42 / 42°F 85% 1011 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 2 / 3 mph 45 / 45°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 2 / 3 mph 46 / 46°F 81% 1014 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 1 / 2 mph 46 / 46°F 86% 1015 mb
Low level cloud: 3%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 1 / 1 mph 45 / 45°F 89% 1017 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		00:00

W
W

 1 / 1 mph 42 / 42°F 90% 1018 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 3 / 5 mph 39 / 38°F 95% 1018 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 5 / 8 mph 38 / 34°F 92% 1018 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 7 / 9 mph 41 / 37°F 81% 1018 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 11 / 13 mph 45 / 39°F 77% 1017 mb
Low level cloud: 21%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 13 / 14 mph 46 / 41°F 82% 1015 mb
Low level cloud: 78%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 13 / 19 mph 45 / 39°F 85% 1014 mb
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 11 / 23 mph 42 / 36°F 90% 1014 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		00:00

S
S

 10 / 14 mph 47 / 42°F 94% 1014 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

S
S

 8 / 13 mph 46 / 42°F 94% 1013 mb
Low level cloud: 100%
Mid level cloud: 92%
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

SSE
SSE

 8 / 16 mph 45 / 41°F 97% 1012 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSE
SSE

 15 / 26 mph 47 / 41°F 89% 1009 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSE
SSE

 17 / 22 mph 50 / 44°F 75% 1006 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 19 / 22 mph 51 / 45°F 70% 1003 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 18 / 23 mph 50 / 43°F 84% 1001 mb
Low level cloud: 100%
Mid level cloud: 86%
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

SSW
SSW

 17 / 32 mph 48 / 41°F 88% 999 mb
Low level cloud: 79%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		00:00

SSW
SSW

 19 / 27 mph 47 / 40°F 67% 1000 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 66%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 22 / 32 mph 44 / 35°F 64% 999 mb
Low level cloud: 95%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 21 / 30 mph 45 / 37°F 80% 1000 mb
Low level cloud: 98%
Mid level cloud: 77%
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

WSW
WSW

 20 / 29 mph 47 / 40°F 77% 1005 mb
Low level cloud: 96%
Mid level cloud: 55%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WSW
WSW

 15 / 20 mph 47 / 41°F 69% 1011 mb
Low level cloud: 85%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 11 / 16 mph 46 / 41°F 72% 1014 mb
Low level cloud: 90%
Mid level cloud: 14%
High level cloud: 20%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 6 / 9 mph 44 / 41°F 77% 1017 mb
Low level cloud: 60%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 4 / 6 mph 42 / 40°F 88% 1020 mb
Low level cloud: 29%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Dec		00:00

SSW
SSW

 13 / 19 mph 47 / 41°F 76% 1010 mb
Low level cloud: 68%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
69%
0.0 In
06:00

SSW
SSW

 11 / 16 mph 43 / 37°F 80% 1013 mb
Low level cloud: 50%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
12:00

S
S

 19 / 31 mph 50 / 43°F 81% 1008 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 83%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 11 / 16 mph 47 / 42°F 85% 1021 mb
Low level cloud: 71%
Mid level cloud: 6%
High level cloud: 71%
Most Significant Cloud Type: low
81%
0.0 In
Sun 21
Dec		00:00

W
W

 13 / 27 mph 46 / 39°F 80% 1014 mb
Low level cloud: 71%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
06:00

S
S

 5 / 7 mph 41 / 38°F 90% 1028 mb
Low level cloud: 39%
Mid level cloud: 89%
High level cloud: 33%
Most Significant Cloud Type: low
73%
0.0 In
12:00

NNW
NNW

 2 / 2 mph 43 / 43°F 63% 1022 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 14%
Most Significant Cloud Type: medium
69%
0.0 In
18:00

SSE
SSE

 3 / 4 mph 46 / 45°F 81% 1022 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
Mon 22
Dec		00:00

W
W

 9 / 14 mph 44 / 40°F 90% 1015 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
06:00

ESE
ESE

 1 / 2 mph 44 / 44°F 85% 1024 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 10 / 16 mph 45 / 40°F 87% 1015 mb
Low level cloud: 98%
Mid level cloud: 31%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 2 / 4 mph 50 / 50°F 89% 1026 mb
Low level cloud: 28%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
Tue 23
Dec		00:00

WSW
WSW

 7 / 12 mph 45 / 41°F 96% 1019 mb
Low level cloud: 89%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
06:00

NW
NW

 2 / 3 mph 39 / 39°F 82% 1027 mb
Low level cloud: 66%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
66%
0.0 In
12:00

WSW
WSW

 3 / 4 mph 47 / 46°F 92% 1022 mb
Low level cloud: 72%
Mid level cloud: 5%
High level cloud: 38%
Most Significant Cloud Type: low
78%
0.0 In
18:00

NNE
NNE

 1 / 2 mph 51 / 51°F 89% 1028 mb
Low level cloud: 18%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
Wed 24
Dec		00:00

SE
SE

 3 / 5 mph 45 / 44°F 88% 1026 mb
Low level cloud: 90%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

 3 / 4 mph 43 / 41°F 84% 1030 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

SSE
SSE

 4 / 6 mph 47 / 46°F 89% 1028 mb
Low level cloud: 83%
Mid level cloud: 10%
High level cloud: 6%
Most Significant Cloud Type: low
86%
0.0 In
18:00

ENE
ENE

 4 / 5 mph 44 / 42°F 87% 1032 mb
Low level cloud: 78%
Mid level cloud: 1%
High level cloud: 39%
Most Significant Cloud Type: low
82%
0.0 In
Thu 25
Dec		00:00

S
S

 6 / 11 mph 43 / 39°F 96% 1027 mb
Low level cloud: 53%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
56%
0.0 In
06:00

NE
NE

 5 / 7 mph 40 / 37°F 87% 1033 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
61%
0.0 In
12:00

NW
NW

 9 / 14 mph 44 / 40°F 82% 1031 mb
Low level cloud: 62%
Mid level cloud: 99%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 8 / 12 mph 43 / 38°F 84% 1030 mb
Low level cloud: 89%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
Fri 26
Dec		00:00

NNE
NNE

 4 / 7 mph 45 / 43°F 80% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

ENE
ENE

 13 / 19 mph 40 / 32°F 64% 1029 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
12:00

N
N

 1 / 1 mph 46 / 46°F 60% 1042 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ENE
ENE

 16 / 23 mph 41 / 33°F 68% 1025 mb
Low level cloud: 81%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
Sat 27
Dec		00:00

S
S

 2 / 3 mph 42 / 42°F 71% 1043 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

E
E

 12 / 18 mph 38 / 30°F 74% 1026 mb
Low level cloud: 62%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
12:00

SSW
SSW

 2 / 4 mph 42 / 42°F 72% 1043 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
0.0 In
18:00

E
E

 10 / 14 mph 41 / 35°F 72% 1029 mb
Low level cloud: 82%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
Sun 28
Dec		00:00

SSW
SSW

 2 / 3 mph 36 / 36°F 79% 1041 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 98%
Most Significant Cloud Type: high
98%
0.0 In
06:00

ENE
ENE

 12 / 17 mph 34 / 26°F 95% 1026 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 2 / 3 mph 43 / 44°F 83% 1042 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
22%
0.0 In
18:00

ESE
ESE

 11 / 16 mph 38 / 31°F 85% 1026 mb
Low level cloud: 52%
Mid level cloud: 56%
High level cloud: 12%
Most Significant Cloud Type: low
72%
0.0 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