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Lower Hartwell 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Lower Hartwell

Buckinghamshire, United Kingdom

Long range weather outlook for Lower Hartwell includes 14 day forecast summary:

The next 14 day outlook for Lower Hartwell shows the average daytime maximum temperature will be around 20°C, with a high for the two weeks of 24°C expected on the afternoon of Monday 24th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 17th at 7°C. Expect the next 14 days have most days seeing a little rain. The indicators are that Saturday 22nd will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 15
Jun		18:00

WSW
WSW

 15 / 20 mph 57 / 52°F 78% 999 mb
Low level cloud: 5%
Mid level cloud: 41%
High level cloud: 1%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 10 / 19 mph 49 / 44°F 93% 1001 mb
Low level cloud: 31%
Mid level cloud: 42%
High level cloud: 4%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 16
Jun		00:00

SSW
SSW

 13 / 21 mph 47 / 42°F 95% 1001 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 13 / 21 mph 47 / 41°F 96% 1000 mb
Low level cloud: 79%
Mid level cloud: 47%
High level cloud: 14%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 13 / 18 mph 49 / 44°F 96% 1000 mb
Low level cloud: 98%
Mid level cloud: 44%
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

 14 / 18 mph 56 / 52°F 86% 1001 mb
Low level cloud: 90%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 13 / 15 mph 64 / 62°F 64% 1002 mb
Low level cloud: 67%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 12 / 15 mph 63 / 62°F 74% 1002 mb
Low level cloud: 25%
Mid level cloud: 25%
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

WSW
WSW

 12 / 17 mph 61 / 60°F 79% 1004 mb
Low level cloud: 3%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 8 / 14 mph 53 / 50°F 93% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 30%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 17
Jun		00:00

SW
SW

 8 / 16 mph 48 / 44°F 96% 1007 mb
Low level cloud: 11%
Mid level cloud: 1%
High level cloud: 40%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 7 / 15 mph 46 / 42°F 97% 1007 mb
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 9 / 13 mph 52 / 47°F 93% 1009 mb
Low level cloud: 42%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 11 / 13 mph 62 / 60°F 74% 1009 mb
Low level cloud: 68%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 12 / 15 mph 65 / 64°F 70% 1010 mb
Low level cloud: 51%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 11 / 15 mph 66 / 64°F 71% 1011 mb
Low level cloud: 22%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 9 / 12 mph 66 / 64°F 80% 1011 mb
Low level cloud: 3%
Mid level cloud: 12%
High level cloud: 82%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 6 / 12 mph 57 / 54°F 92% 1013 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 95%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun		00:00

NNW
NNW

 4 / 9 mph 52 / 51°F 95% 1014 mb
Low level cloud: 20%
Mid level cloud: 6%
High level cloud: 26%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 5 / 11 mph 48 / 45°F 94% 1015 mb
Low level cloud: 20%
Mid level cloud: 5%
High level cloud: 35%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 6 / 9 mph 53 / 49°F 89% 1016 mb
Low level cloud: 14%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 9 / 11 mph 61 / 59°F 77% 1016 mb
Low level cloud: 21%
Mid level cloud: 1%
High level cloud: 18%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 9 / 10 mph 67 / 65°F 67% 1017 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 10 / 12 mph 66 / 65°F 72% 1017 mb
Low level cloud: 83%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 8 / 10 mph 64 / 62°F 82% 1018 mb
Low level cloud: 36%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 7 / 13 mph 55 / 51°F 95% 1021 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Jun		00:00

ENE
ENE

 6 / 11 mph 51 / 48°F 95% 1022 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 6 / 13 mph 48 / 45°F 94% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 4 / 7 mph 53 / 50°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 6 / 8 mph 62 / 60°F 71% 1024 mb
Low level cloud: 1%
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

ESE
ESE

 6 / 7 mph 69 / 66°F 61% 1023 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 8 / 9 mph 71 / 68°F 61% 1022 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 10 / 13 mph 67 / 65°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 8 / 16 mph 55 / 52°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 75%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Jun		00:00

E
E

 7 / 14 mph 50 / 47°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 18%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 6 / 13 mph 49 / 46°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 10 / 17 mph 54 / 50°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 80%
High level cloud: 87%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 9 / 12 mph 61 / 60°F 83% 1011 mb
Low level cloud: 56%
Mid level cloud: 67%
High level cloud: 4%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 10 / 13 mph 60 / 59°F 86% 1010 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 7 / 8 mph 68 / 65°F 74% 1007 mb
Low level cloud: 62%
Mid level cloud: 14%
High level cloud: 17%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 2 / 3 mph 62 / 62°F 87% 1007 mb
Low level cloud: 95%
Mid level cloud: 25%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 5 / 8 mph 61 / 60°F 94% 1006 mb
Low level cloud: 88%
Mid level cloud: 4%
High level cloud: 39%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Jun		00:00

SSW
SSW

 8 / 13 mph 56 / 54°F 96% 1007 mb
Low level cloud: 42%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 13 / 18 mph 55 / 52°F 94% 1007 mb
Low level cloud: 91%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 15 / 21 mph 56 / 52°F 90% 1007 mb
Low level cloud: 90%
Mid level cloud: 18%
High level cloud: 17%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 15 / 19 mph 60 / 60°F 82% 1008 mb
Low level cloud: 84%
Mid level cloud: 24%
High level cloud: 10%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 17 / 20 mph 65 / 64°F 68% 1009 mb
Low level cloud: 59%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 13 / 17 mph 67 / 65°F 69% 1009 mb
Low level cloud: 35%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 14 / 19 mph 60 / 56°F 77% 1010 mb
Low level cloud: 6%
Mid level cloud: 26%
High level cloud: 68%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 7 / 14 mph 53 / 50°F 91% 1011 mb
Low level cloud: 69%
Mid level cloud: 43%
High level cloud: 15%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 22
Jun		00:00

W
W

 2 / 3 mph 62 / 62°F 86% 1020 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 12%
Most Significant Cloud Type: medium
35%
0.0 In
06:00

SSW
SSW

 4 / 9 mph 60 / 60°F 90% 1020 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
21%
0.0 In
12:00

S
S

 10 / 21 mph 66 / 66°F 74% 1015 mb
Low level cloud: 47%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: low
54%
0.0 In
18:00

SSW
SSW

 9 / 20 mph 70 / 70°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
0.0 In
Sun 23
Jun		00:00

WSW
WSW

 6 / 13 mph 59 / 59°F 89% 1017 mb
Low level cloud: 7%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
42%
0.0 In
06:00

WSW
WSW

 12 / 26 mph 53 / 49°F 91% 1011 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
30%
0.0 In
12:00

WSW
WSW

 11 / 22 mph 64 / 64°F 72% 1018 mb
Low level cloud: 80%
Mid level cloud: 32%
High level cloud: 14%
Most Significant Cloud Type: low
92%
0.0 In
18:00

NNW
NNW

 7 / 16 mph 68 / 68°F 81% 1017 mb
Low level cloud: 15%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
Mon 24
Jun		00:00

NE
NE

 4 / 7 mph 59 / 59°F 96% 1019 mb
Low level cloud: 55%
Mid level cloud: 12%
High level cloud: 33%
Most Significant Cloud Type: low
62%
0.0 In
06:00

ENE
ENE

 3 / 6 mph 62 / 62°F 90% 1019 mb
Low level cloud: 17%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
12:00

NNE
NNE

 2 / 4 mph 70 / 70°F 73% 1021 mb
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 21%
Most Significant Cloud Type: low
57%
0.0 In
18:00

NNW
NNW

 2 / 5 mph 71 / 71°F 78% 1018 mb
Low level cloud: 67%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
Tue 25
Jun		00:00

N
N

 1 / 3 mph 62 / 62°F 88% 1022 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 6%
Most Significant Cloud Type: medium
30%
0.0 In
06:00

W
W

 4 / 9 mph 64 / 64°F 86% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ENE
ENE

 7 / 15 mph 72 / 76°F 67% 1023 mb
Low level cloud: 60%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
64%
0.0 In
18:00

NNW
NNW

 3 / 6 mph 76 / 79°F 75% 1022 mb
Low level cloud: 29%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
Wed 26
Jun		00:00

ENE
ENE

 4 / 9 mph 62 / 62°F 94% 1025 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
8%
0.0 In
06:00

NE
NE

 4 / 9 mph 66 / 66°F 90% 1025 mb
Low level cloud: 29%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
46%
0.0 In
12:00

NE
NE

 15 / 31 mph 67 / 67°F 65% 1023 mb
Low level cloud: 34%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
35%
0.0 In
18:00

E
E

 6 / 14 mph 71 / 71°F 85% 1024 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.1 In
Thu 27
Jun		00:00

NE
NE

 11 / 22 mph 53 / 49°F 97% 1022 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 34%
Most Significant Cloud Type: low
31%
0.0 In
06:00

ESE
ESE

 4 / 9 mph 60 / 60°F 83% 1023 mb
Low level cloud: 18%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NE
NE

 14 / 29 mph 64 / 64°F 81% 1020 mb
Low level cloud: 95%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
18:00

E
E

 8 / 16 mph 73 / 77°F 78% 1019 mb
Low level cloud: 14%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
Fri 28
Jun		00:00

NNE
NNE

 10 / 22 mph 53 / 50°F 98% 1019 mb
Low level cloud: 50%
Mid level cloud: 47%
High level cloud: 1%
Most Significant Cloud Type: low
66%
0.0 In
06:00

WNW
WNW

 8 / 17 mph 61 / 61°F 93% 1016 mb
Low level cloud: 64%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
12:00

ENE
ENE

 13 / 28 mph 75 / 78°F 64% 1017 mb
Low level cloud: 58%
Mid level cloud: 11%
High level cloud: 13%
Most Significant Cloud Type: low
63%
0.0 In
18:00

NNW
NNW

 12 / 25 mph 61 / 61°F 77% 1014 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.1 In
Sat 29
Jun		00:00

NE
NE

 8 / 17 mph 62 / 62°F 96% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

NNW
NNW

 11 / 22 mph 54 / 50°F 96% 1013 mb
Low level cloud: 90%
Mid level cloud: 9%
High level cloud: 13%
Most Significant Cloud Type: low
95%
0.0 In
12:00

ENE
ENE

 14 / 30 mph 78 / 81°F 61% 1018 mb
Low level cloud: 3%
Mid level cloud: 10%
High level cloud: 27%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

NNE
NNE

 16 / 34 mph 65 / 65°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.1 In
Sun 30
Jun		00:00

NE
NE

 9 / 19 mph 62 / 62°F 95% 1018 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
9%
0.0 In
06:00

N
N

 12 / 24 mph 56 / 53°F 85% 1018 mb
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 84%
Most Significant Cloud Type: medium
58%
0.0 In
12:00

ENE
ENE

 13 / 28 mph 78 / 81°F 65% 1017 mb
Low level cloud: 35%
Mid level cloud: 21%
High level cloud: 8%
Most Significant Cloud Type: low
43%
0.0 In
18:00

N
N

 14 / 30 mph 66 / 66°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
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