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Amersham Common 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Amersham Common

Buckinghamshire, United Kingdom

Long range weather outlook for Amersham Common includes 14 day forecast summary:

The outlook for Amersham Common in the two weeks ahead shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 20°C expected on the afternoon of Friday 24th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 21st at 5°C. The fortnight ahead will have most days seeing a little rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
May		18:00

S
S

 6 / 8 mph 65 / 63°F 71% 1005 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 19%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 4 / 6 mph 58 / 59°F 82% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

E
E

 5 / 8 mph 54 / 54°F 90% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 47%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 3 / 6 mph 52 / 52°F 91% 1006 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 4 / 7 mph 53 / 52°F 88% 1006 mb
Low level cloud: 12%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 6 / 9 mph 56 / 55°F 81% 1006 mb
Low level cloud: 34%
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

N
N

 5 / 8 mph 56 / 55°F 82% 1006 mb
Low level cloud: 9%
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

NW
NW

 7 / 10 mph 56 / 54°F 83% 1006 mb
Low level cloud: 14%
Mid level cloud: 100%
High level cloud: 60%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 6 / 8 mph 56 / 54°F 88% 1006 mb
Low level cloud: 39%
Mid level cloud: 73%
High level cloud: 99%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 5 / 8 mph 53 / 51°F 95% 1006 mb
Low level cloud: 33%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

WSW
WSW

 4 / 8 mph 51 / 50°F 94% 1006 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 6 / 10 mph 50 / 48°F 97% 1007 mb
Low level cloud: 48%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 5 / 9 mph 53 / 49°F 91% 1008 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 7 / 9 mph 60 / 58°F 67% 1009 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
12:00

SSW
SSW

 6 / 8 mph 65 / 64°F 62% 1010 mb
Low level cloud: 67%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 6 / 9 mph 67 / 64°F 69% 1010 mb
Low level cloud: 27%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 3 / 4 mph 66 / 63°F 79% 1011 mb
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 51%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 2 / 4 mph 58 / 59°F 88% 1012 mb
Low level cloud: 22%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

W
W

 2 / 4 mph 56 / 57°F 91% 1013 mb
Low level cloud: 15%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 4 / 6 mph 54 / 54°F 92% 1013 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 4 / 6 mph 55 / 54°F 91% 1014 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 8 / 10 mph 61 / 60°F 79% 1014 mb
Low level cloud: 69%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 7 / 9 mph 67 / 65°F 67% 1014 mb
Low level cloud: 40%
Mid level cloud: 17%
High level cloud: 81%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 9 / 13 mph 67 / 65°F 70% 1013 mb
Low level cloud: 45%
Mid level cloud: 25%
High level cloud: 7%
Most Significant Cloud Type: low
54%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

 10 / 14 mph 63 / 61°F 85% 1014 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 8 / 13 mph 55 / 52°F 96% 1015 mb
Low level cloud: 25%
Mid level cloud: 38%
High level cloud: 13%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 7 / 11 mph 52 / 50°F 96% 1015 mb
Low level cloud: 49%
Mid level cloud: 66%
High level cloud: 6%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 10 mph 51 / 49°F 95% 1015 mb
Low level cloud: 64%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 9 / 13 mph 52 / 48°F 95% 1016 mb
Low level cloud: 75%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 12 / 16 mph 53 / 49°F 88% 1016 mb
Low level cloud: 94%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 11 / 14 mph 61 / 60°F 74% 1016 mb
Low level cloud: 84%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 14 / 19 mph 62 / 61°F 74% 1016 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 14 / 19 mph 58 / 54°F 83% 1016 mb
Low level cloud: 32%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 13 / 19 mph 49 / 44°F 91% 1018 mb
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 13 / 18 mph 49 / 44°F 82% 1018 mb
Low level cloud: 96%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 13 / 18 mph 49 / 44°F 79% 1018 mb
Low level cloud: 81%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 13 / 17 mph 49 / 43°F 84% 1019 mb
Low level cloud: 47%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 13 / 16 mph 54 / 50°F 67% 1019 mb
Low level cloud: 10%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 12 / 14 mph 59 / 56°F 59% 1018 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 13 / 16 mph 61 / 59°F 58% 1017 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 11 / 13 mph 58 / 54°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 8 / 11 mph 49 / 46°F 88% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 7 / 11 mph 44 / 40°F 95% 1017 mb
Low level cloud: 45%
Mid level cloud: 30%
High level cloud: 22%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 6 / 11 mph 44 / 40°F 94% 1016 mb
Low level cloud: 29%
Mid level cloud: 99%
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

NNE
NNE

 8 / 11 mph 48 / 43°F 87% 1016 mb
Low level cloud: 15%
Mid level cloud: 28%
High level cloud: 21%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 9 / 11 mph 58 / 54°F 67% 1015 mb
Low level cloud: 42%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 11 / 14 mph 59 / 59°F 74% 1014 mb
Low level cloud: 78%
Mid level cloud: 81%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 10 / 13 mph 61 / 61°F 76% 1012 mb
Low level cloud: 82%
Mid level cloud: 48%
High level cloud: 8%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 10 / 14 mph 59 / 56°F 90% 1012 mb
Low level cloud: 89%
Mid level cloud: 31%
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

NE
NE

 8 / 12 mph 53 / 51°F 91% 1013 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 43%
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
Wed 22
May		00:00

SW
SW

 8 / 17 mph 52 / 49°F 98% 1009 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
73%
0.0 In
06:00

NE
NE

 5 / 10 mph 51 / 50°F 91% 1013 mb
Low level cloud: 47%
Mid level cloud: 74%
High level cloud: 17%
Most Significant Cloud Type: low
75%
0.0 In
12:00

NNW
NNW

 4 / 10 mph 57 / 57°F 97% 1010 mb
Low level cloud: 100%
Mid level cloud: 51%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

 10 / 21 mph 60 / 60°F 85% 1012 mb
Low level cloud: 74%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
Thu 23
May		00:00

NNE
NNE

 4 / 9 mph 54 / 54°F 97% 1013 mb
Low level cloud: 59%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
06:00

SSW
SSW

 5 / 11 mph 58 / 58°F 89% 1021 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
0.0 In
12:00

NNW
NNW

 19 / 40 mph 52 / 46°F 97% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 40%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 7 / 15 mph 64 / 64°F 84% 1017 mb
Low level cloud: 23%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
Fri 24
May		00:00

NNE
NNE

 13 / 28 mph 52 / 48°F 98% 1019 mb
Low level cloud: 98%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
06:00

NNE
NNE

 11 / 23 mph 52 / 48°F 91% 1018 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
12:00

SE
SE

 2 / 4 mph 61 / 61°F 93% 1021 mb
Low level cloud: 92%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 13 / 26 mph 63 / 63°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
Sat 25
May		00:00

SSW
SSW

 4 / 9 mph 63 / 63°F 94% 1021 mb
Low level cloud: 12%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
06:00

NNE
NNE

 9 / 20 mph 52 / 49°F 89% 1019 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 29%
Most Significant Cloud Type: low
21%
0.0 In
12:00

SSW
SSW

 6 / 12 mph 68 / 68°F 64% 1019 mb
Low level cloud: 60%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
62%
0.0 In
18:00

NNE
NNE

 5 / 11 mph 66 / 66°F 73% 1016 mb
Low level cloud: 17%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
34%
0.0 In
Sun 26
May		00:00

NNW
NNW

 3 / 6 mph 67 / 67°F 89% 1019 mb
Low level cloud: 9%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
06:00

NNE
NNE

 6 / 13 mph 55 / 53°F 66% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ENE
ENE

 13 / 26 mph 72 / 72°F 69% 1017 mb
Low level cloud: 44%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
18:00

NNW
NNW

 4 / 9 mph 71 / 71°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
Mon 27
May		00:00

ENE
ENE

 12 / 24 mph 57 / 54°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
0.1 In
06:00

NW
NW

 9 / 19 mph 51 / 48°F 81% 1019 mb
Low level cloud: 11%
Mid level cloud: 40%
High level cloud: 91%
Most Significant Cloud Type: medium
73%
0.0 In
12:00

NE
NE

 19 / 39 mph 61 / 61°F 61% 1017 mb
Low level cloud: 63%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
18:00

NW
NW

 13 / 26 mph 60 / 60°F 72% 1018 mb
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 36%
Most Significant Cloud Type: medium
37%
0.0 In
Tue 28
May		00:00

NNE
NNE

 19 / 39 mph 51 / 45°F 93% 1011 mb
Low level cloud: 84%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 13 / 27 mph 47 / 41°F 86% 1020 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
23%
0.0 In
12:00

NNE
NNE

 7 / 16 mph 58 / 57°F 82% 1005 mb
Low level cloud: 68%
Mid level cloud: 20%
High level cloud: 21%
Most Significant Cloud Type: low
77%
0.1 In
18:00

NNW
NNW

 11 / 23 mph 59 / 59°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 29
May		00:00

ENE
ENE

 4 / 7 mph 58 / 58°F 97% 1007 mb
Low level cloud: 55%
Mid level cloud: 49%
High level cloud: 15%
Most Significant Cloud Type: low
73%
0.1 In
06:00

W
W

 9 / 18 mph 52 / 49°F 81% 1020 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

SSW
SSW

 4 / 9 mph 65 / 65°F 78% 1006 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.3 In
18:00

W
W

 14 / 28 mph 57 / 54°F 72% 1016 mb
Low level cloud: 18%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 30
May		00:00

WSW
WSW

 4 / 9 mph 64 / 64°F 88% 1007 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
06:00

WSW
WSW

 10 / 21 mph 52 / 49°F 90% 1015 mb
Low level cloud: 79%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 10 / 21 mph 59 / 59°F 83% 1006 mb
Low level cloud: 1%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: medium
55%
0.0 In
18:00

N
N

 4 / 9 mph 62 / 62°F 84% 1013 mb
Low level cloud: 70%
Mid level cloud: 48%
High level cloud: 17%
Most Significant Cloud Type: low
88%
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