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Crawshawbooth 14 Day Long Range Forecast

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

Lancashire, United Kingdom

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

The next 14 day outlook for Crawshawbooth shows the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 15°C expected on the afternoon of Sunday 20th. The average minimum temperature will be 3°C, dipping to its lowest on the morning of Saturday 26th at -1°C. Expect the next 14 days have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Predictions are Monday 21st will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 18
Apr		18:00

ESE
ESE

 17 / 26 mph 49 / 42°F 86% 1008 mb
Low level cloud: 95%
Mid level cloud: 86%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

E
E

 18 / 26 mph 45 / 38°F 88% 1009 mb
Low level cloud: 91%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 19
Apr		00:00

E
E

 18 / 28 mph 43 / 35°F 87% 1009 mb
Low level cloud: 82%
Mid level cloud: 70%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 18 / 26 mph 43 / 35°F 84% 1009 mb
Low level cloud: 15%
Mid level cloud: 65%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 17 / 23 mph 44 / 36°F 88% 1010 mb
Low level cloud: 43%
Mid level cloud: 71%
High level cloud: 68%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 17 / 19 mph 49 / 42°F 81% 1011 mb
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 45%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 18 / 21 mph 54 / 50°F 64% 1010 mb
Low level cloud: 71%
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
15:00

E
E

 17 / 20 mph 54 / 49°F 56% 1010 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 16 / 21 mph 48 / 42°F 62% 1011 mb
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 12 / 18 mph 42 / 35°F 80% 1011 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 20
Apr		00:00

ENE
ENE

 8 / 14 mph 38 / 32°F 93% 1011 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 7 / 13 mph 36 / 31°F 96% 1010 mb
Low level cloud: 23%
Mid level cloud: 36%
High level cloud: 33%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 6 / 9 mph 38 / 32°F 95% 1010 mb
Low level cloud: 42%
Mid level cloud: 44%
High level cloud: 42%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 10 / 11 mph 48 / 43°F 66% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 10 / 11 mph 55 / 51°F 51% 1008 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 8 / 10 mph 58 / 56°F 48% 1007 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 53%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 9 / 14 mph 54 / 50°F 65% 1006 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 97%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 10 / 17 mph 45 / 40°F 83% 1008 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 27%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 21
Apr		00:00

E
E

 6 / 9 mph 44 / 41°F 86% 1007 mb
Low level cloud: 35%
Mid level cloud: 89%
High level cloud: 22%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 4 / 6 mph 44 / 42°F 91% 1006 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 4 / 6 mph 44 / 41°F 96% 1007 mb
Low level cloud: 91%
Mid level cloud: 98%
High level cloud: 70%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

ESE
ESE

 4 / 5 mph 45 / 44°F 96% 1007 mb
Low level cloud: 98%
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
12:00

SSW
SSW

 3 / 4 mph 48 / 47°F 94% 1008 mb
Low level cloud: 95%
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

W
W

 5 / 6 mph 46 / 44°F 95% 1009 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 3 / 4 mph 47 / 46°F 91% 1010 mb
Low level cloud: 90%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 3 / 5 mph 44 / 42°F 93% 1012 mb
Low level cloud: 54%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 22
Apr		00:00

SSW
SSW

 4 / 7 mph 42 / 40°F 97% 1012 mb
Low level cloud: 34%
Mid level cloud: 100%
High level cloud: 48%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 3 / 6 mph 41 / 38°F 96% 1013 mb
Low level cloud: 32%
Mid level cloud: 95%
High level cloud: 67%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 3 / 6 mph 42 / 40°F 96% 1014 mb
Low level cloud: 30%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 5 mph 51 / 49°F 78% 1014 mb
Low level cloud: 11%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 7 / 9 mph 56 / 53°F 61% 1014 mb
Low level cloud: 36%
Mid level cloud: 13%
High level cloud: 34%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 9 / 10 mph 58 / 56°F 51% 1013 mb
Low level cloud: 1%
Mid level cloud: 87%
High level cloud: 13%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 7 / 9 mph 53 / 49°F 82% 1013 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: medium
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 5 / 11 mph 45 / 43°F 86% 1014 mb
Low level cloud: 90%
Mid level cloud: 86%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 23
Apr		00:00

ENE
ENE

 8 / 17 mph 44 / 39°F 91% 1013 mb
Low level cloud: 8%
Mid level cloud: 23%
High level cloud: 36%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 10 / 19 mph 42 / 36°F 96% 1014 mb
Low level cloud: 34%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 12 / 19 mph 43 / 36°F 94% 1015 mb
Low level cloud: 45%
Mid level cloud: 35%
High level cloud: 33%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 19 / 22 mph 51 / 44°F 78% 1016 mb
Low level cloud: 58%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 15 / 18 mph 55 / 50°F 68% 1016 mb
Low level cloud: 62%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 12 / 14 mph 50 / 45°F 85% 1016 mb
Low level cloud: 91%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 13 / 16 mph 47 / 41°F 93% 1017 mb
Low level cloud: 100%
Mid level cloud: 57%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 15 / 19 mph 45 / 39°F 93% 1019 mb
Low level cloud: 98%
Mid level cloud: 52%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Apr		00:00

NNE
NNE

 13 / 17 mph 43 / 36°F 91% 1020 mb
Low level cloud: 89%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 16 / 20 mph 41 / 33°F 82% 1021 mb
Low level cloud: 97%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 16 / 20 mph 41 / 33°F 74% 1022 mb
Low level cloud: 90%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 17 / 19 mph 43 / 35°F 69% 1023 mb
Low level cloud: 89%
Mid level cloud: 6%
High level cloud: 20%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 15 / 17 mph 48 / 42°F 60% 1022 mb
Low level cloud: 91%
Mid level cloud: 7%
High level cloud: 34%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 16 / 18 mph 50 / 44°F 55% 1022 mb
Low level cloud: 51%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 12 / 14 mph 45 / 39°F 66% 1023 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 5 / 9 mph 36 / 32°F 79% 1024 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 25
Apr		00:00

ENE
ENE

 7 / 13 mph 42 / 37°F 95% 1026 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
06:00

ENE
ENE

 5 / 10 mph 47 / 45°F 92% 1020 mb
Low level cloud: 16%
Mid level cloud: 25%
High level cloud: 4%
Most Significant Cloud Type: low
25%
0.0 In
12:00

E
E

 8 / 13 mph 57 / 56°F 64% 1022 mb
Low level cloud: 47%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
66%
0.0 In
18:00

E
E

 10 / 18 mph 48 / 44°F 97% 1017 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 71%
Most Significant Cloud Type: low
100%
0.0 In
Sat 26
Apr		00:00

ENE
ENE

 4 / 9 mph 47 / 45°F 90% 1027 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

ESE
ESE

 2 / 3 mph 52 / 53°F 79% 1031 mb
Low level cloud: 3%
Mid level cloud: 58%
High level cloud: 14%
Most Significant Cloud Type: medium
66%
0.0 In
12:00

ENE
ENE

 7 / 14 mph 55 / 53°F 61% 1029 mb
Low level cloud: 24%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: low
30%
0.0 In
18:00

NW
NW

 4 / 8 mph 61 / 61°F 76% 1028 mb
Low level cloud: 26%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Sun 27
Apr		00:00

NNE
NNE

 1 / 1 mph 45 / 45°F 88% 1030 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
9%
0.0 In
06:00

SSW
SSW

 2 / 3 mph 50 / 50°F 91% 1029 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: low
14%
0.0 In
12:00

WNW
WNW

 7 / 11 mph 58 / 57°F 60% 1029 mb
Low level cloud: 23%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
25%
0.0 In
18:00

ENE
ENE

 5 / 11 mph 55 / 54°F 82% 1028 mb
Low level cloud: 65%
Mid level cloud: 51%
High level cloud: 1%
Most Significant Cloud Type: low
82%
0.0 In
Mon 28
Apr		00:00

W
W

 2 / 4 mph 46 / 46°F 80% 1029 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
40%
0.0 In
06:00

E
E

 3 / 6 mph 47 / 46°F 83% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

WNW
WNW

 14 / 21 mph 57 / 53°F 66% 1027 mb
Low level cloud: 35%
Mid level cloud: 32%
High level cloud: 67%
Most Significant Cloud Type: low
53%
0.0 In
18:00

NE
NE

 1 / 2 mph 66 / 66°F 63% 1025 mb
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: low
11%
0.0 In
Tue 29
Apr		00:00

WNW
WNW

 4 / 7 mph 50 / 49°F 75% 1026 mb
Low level cloud: 36%
Mid level cloud: 54%
High level cloud: 9%
Most Significant Cloud Type: low
55%
0.0 In
06:00

W
W

 2 / 5 mph 51 / 51°F 79% 1026 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: medium
26%
0.0 In
12:00

WNW
WNW

 5 / 8 mph 58 / 58°F 68% 1027 mb
Low level cloud: 91%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 6 / 12 mph 59 / 59°F 73% 1026 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
Wed 30
Apr		00:00

SSE
SSE

 2 / 2 mph 50 / 49°F 94% 1029 mb
Low level cloud: 34%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
06:00

WNW
WNW

 2 / 4 mph 52 / 53°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

WSW
WSW

 8 / 13 mph 63 / 63°F 60% 1029 mb
Low level cloud: 21%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: low
23%
0.0 In
18:00

WNW
WNW

 7 / 14 mph 56 / 54°F 76% 1027 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
Thu 01
May		00:00

SW
SW

 4 / 7 mph 50 / 48°F 92% 1029 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

N
N

 3 / 7 mph 53 / 52°F 83% 1028 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

W
W

 15 / 25 mph 56 / 53°F 63% 1030 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
0.0 In
18:00

ENE
ENE

 12 / 26 mph 53 / 49°F 77% 1028 mb
Low level cloud: 36%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
Fri 02
May		00:00

WSW
WSW

 2 / 3 mph 48 / 48°F 89% 1028 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 45%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

NE
NE

 11 / 23 mph 46 / 40°F 85% 1030 mb
Low level cloud: 91%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
12:00

SSW
SSW

 16 / 27 mph 63 / 63°F 55% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 36%
Most Significant Cloud Type: high
35%
0.0 In
18:00

NE
NE

 11 / 23 mph 50 / 45°F 68% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
0.0 In
Sat 03
May		00:00

WSW
WSW

 11 / 19 mph 43 / 37°F 94% 1016 mb
Low level cloud: 63%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: low
67%
0.0 In
06:00

NE
NE

 10 / 20 mph 43 / 38°F 69% 1029 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
86%
0.0 In
12:00

WSW
WSW

 19 / 33 mph 46 / 38°F 92% 1013 mb
Low level cloud: 90%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 8 / 16 mph 51 / 48°F 66% 1026 mb
Low level cloud: 65%
Mid level cloud: 0%
High level cloud: 60%
Most Significant Cloud Type: low
71%
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