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Old Coulsdon 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Old Coulsdon

Surrey, United Kingdom

Long range weather outlook for Old Coulsdon includes 14 day forecast summary:

The outlook for Old Coulsdon in the two weeks ahead shows the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 22°C expected on the afternoon of Tuesday 21st. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 21st at 7°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		18:00

WSW
WSW

 3 / 4 mph 66 / 63°F 83% 1011 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 4 / 6 mph 59 / 59°F 90% 1012 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNW
NNW

 4 / 7 mph 56 / 56°F 95% 1012 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 7 mph 54 / 53°F 97% 1012 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 5 / 7 mph 54 / 52°F 93% 1012 mb
Low level cloud: 47%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 4 / 6 mph 54 / 53°F 94% 1013 mb
Low level cloud: 63%
Mid level cloud: 79%
High level cloud: 32%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 6 / 7 mph 64 / 63°F 72% 1013 mb
Low level cloud: 91%
Mid level cloud: 94%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 7 / 9 mph 66 / 65°F 73% 1012 mb
Low level cloud: 74%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 5 / 8 mph 67 / 65°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 8 mph 59 / 59°F 93% 1014 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 14%
Most Significant Cloud Type: low
19%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 5 / 8 mph 54 / 53°F 96% 1014 mb
Low level cloud: 54%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 7 mph 51 / 50°F 97% 1014 mb
Low level cloud: 71%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 10 mph 54 / 49°F 93% 1015 mb
Low level cloud: 53%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 8 / 10 mph 63 / 62°F 69% 1016 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 9 / 10 mph 69 / 67°F 53% 1015 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 11 / 13 mph 68 / 66°F 66% 1015 mb
Low level cloud: 37%
Mid level cloud: 30%
High level cloud: 1%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 8 / 11 mph 65 / 63°F 81% 1015 mb
Low level cloud: 26%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 7 mph 62 / 62°F 89% 1016 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 6 / 6 mph 55 / 54°F 87% 1016 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
03:00

NNE
NNE

 5 / 8 mph 51 / 49°F 87% 1015 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
06:00

NNE
NNE

 7 / 11 mph 50 / 47°F 85% 1015 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 11 / 12 mph 61 / 59°F 68% 1014 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

NE
NE

 10 / 11 mph 67 / 65°F 59% 1013 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 11 / 13 mph 67 / 65°F 60% 1011 mb
Low level cloud: 33%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 9 / 10 mph 65 / 62°F 71% 1011 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 6 / 6 mph 58 / 57°F 85% 1012 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 5 / 6 mph 53 / 52°F 87% 1011 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 4 / 6 mph 49 / 48°F 85% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 7 mph 49 / 47°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 84%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 4 / 5 mph 60 / 58°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 3 / 3 mph 68 / 66°F 55% 1009 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 96%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 1 / 2 mph 71 / 67°F 51% 1008 mb
Low level cloud: 36%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 3 / 4 mph 68 / 65°F 71% 1009 mb
Low level cloud: 40%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 3 / 4 mph 58 / 59°F 86% 1010 mb
Low level cloud: 84%
Mid level cloud: 52%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

S
S

 2 / 3 mph 57 / 57°F 89% 1010 mb
Low level cloud: 57%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 2 / 3 mph 56 / 58°F 91% 1009 mb
Low level cloud: 19%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 4 / 6 mph 57 / 56°F 91% 1010 mb
Low level cloud: 13%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 6 / 8 mph 63 / 60°F 77% 1010 mb
Low level cloud: 22%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 9 / 11 mph 66 / 64°F 66% 1010 mb
Low level cloud: 25%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 7 / 10 mph 65 / 63°F 75% 1010 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNE
NNE

 6 / 8 mph 60 / 57°F 90% 1011 mb
Low level cloud: 24%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

 1 / 2 mph 56 / 56°F 91% 1012 mb
Low level cloud: 50%
Mid level cloud: 99%
High level cloud: 86%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

W
W

 5 / 8 mph 55 / 54°F 92% 1012 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 5 / 8 mph 54 / 52°F 97% 1012 mb
Low level cloud: 81%
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
06:00

W
W

 6 / 9 mph 53 / 51°F 98% 1013 mb
Low level cloud: 90%
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

NW
NW

 6 / 8 mph 53 / 51°F 94% 1014 mb
Low level cloud: 83%
Mid level cloud: 55%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WNW
WNW

 10 / 12 mph 57 / 55°F 78% 1015 mb
Low level cloud: 89%
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

WNW
WNW

 7 / 9 mph 61 / 60°F 68% 1015 mb
Low level cloud: 85%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 4 / 5 mph 62 / 60°F 78% 1015 mb
Low level cloud: 71%
Mid level cloud: 30%
High level cloud: 10%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 3 / 6 mph 55 / 55°F 91% 1017 mb
Low level cloud: 68%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		00:00

W
W

 9 / 18 mph 57 / 55°F 98% 1010 mb
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

 3 / 7 mph 52 / 52°F 93% 1014 mb
Low level cloud: 98%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 11 / 24 mph 57 / 54°F 81% 1016 mb
Low level cloud: 93%
Mid level cloud: 99%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 7 / 15 mph 68 / 68°F 74% 1018 mb
Low level cloud: 11%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: low
15%
0.0 In
Sat 25
May		00:00

NE
NE

 15 / 31 mph 56 / 52°F 90% 1016 mb
Low level cloud: 93%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
99%
0.0 In
06:00

NW
NW

 4 / 9 mph 63 / 63°F 86% 1024 mb
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
12:00

SW
SW

 8 / 16 mph 62 / 62°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 81%
Most Significant Cloud Type: high
81%
0.0 In
18:00

SE
SE

 7 / 15 mph 71 / 71°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sun 26
May		00:00

ENE
ENE

 5 / 11 mph 60 / 60°F 89% 1014 mb
Low level cloud: 2%
Mid level cloud: 70%
High level cloud: 39%
Most Significant Cloud Type: medium
77%
0.0 In
06:00

ESE
ESE

 5 / 10 mph 61 / 61°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

E
E

 13 / 28 mph 66 / 66°F 75% 1012 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 42%
Most Significant Cloud Type: medium
84%
0.1 In
18:00

WSW
WSW

 7 / 15 mph 62 / 62°F 91% 1015 mb
Low level cloud: 43%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
79%
0.2 In
Mon 27
May		00:00

NE
NE

 11 / 23 mph 57 / 54°F 92% 1012 mb
Low level cloud: 48%
Mid level cloud: 82%
High level cloud: 33%
Most Significant Cloud Type: low
80%
0.1 In
06:00

WNW
WNW

 9 / 19 mph 54 / 51°F 87% 1016 mb
Low level cloud: 14%
Mid level cloud: 15%
High level cloud: 20%
Most Significant Cloud Type: low
21%
0.0 In
12:00

NE
NE

 13 / 26 mph 63 / 63°F 76% 1014 mb
Low level cloud: 88%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
18:00

WNW
WNW

 9 / 18 mph 60 / 60°F 58% 1019 mb
Low level cloud: 28%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Tue 28
May		00:00

NE
NE

 6 / 13 mph 58 / 57°F 94% 1014 mb
Low level cloud: 60%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
06:00

NW
NW

 4 / 9 mph 56 / 55°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SE
SE

 2 / 4 mph 74 / 77°F 57% 1012 mb
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
32%
0.0 In
18:00

W
W

 3 / 6 mph 67 / 67°F 76% 1023 mb
Low level cloud: 11%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.1 In
Wed 29
May		00:00

WSW
WSW

 4 / 8 mph 64 / 64°F 91% 1010 mb
Low level cloud: 42%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
46%
0.1 In
06:00

W
W

 2 / 4 mph 59 / 59°F 89% 1022 mb
Low level cloud: 12%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
12:00

WNW
WNW

 8 / 17 mph 64 / 64°F 78% 1009 mb
Low level cloud: 93%
Mid level cloud: 51%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

 7 / 15 mph 56 / 54°F 67% 1020 mb
Low level cloud: 85%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Thu 30
May		00:00

WNW
WNW

 8 / 17 mph 56 / 55°F 74% 1011 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
7%
0.0 In
06:00

SSW
SSW

 7 / 15 mph 53 / 51°F 96% 1018 mb
Low level cloud: 100%
Mid level cloud: 77%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 10 / 22 mph 62 / 62°F 56% 1010 mb
Low level cloud: 12%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

NNW
NNW

 7 / 15 mph 62 / 62°F 73% 1019 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 53%
Most Significant Cloud Type: low
33%
0.0 In
Fri 31
May		00:00

SSW
SSW

 6 / 12 mph 53 / 51°F 95% 1010 mb
Low level cloud: 23%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.1 In
06:00

W
W

 2 / 5 mph 60 / 60°F 79% 1022 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
0.0 In
12:00

WSW
WSW

 8 / 17 mph 65 / 65°F 50% 1009 mb
Low level cloud: 12%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
18:00

W
W

 11 / 23 mph 61 / 61°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
0.0 In
Sat 01
Jun		00:00

WNW
WNW

 7 / 14 mph 55 / 53°F 92% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.1 In
06:00

WSW
WSW

 7 / 15 mph 55 / 53°F 84% 1021 mb
Low level cloud: 85%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
88%
0.0 In
12:00

NW
NW

 8 / 16 mph 63 / 63°F 47% 1018 mb
Low level cloud: 12%
Mid level cloud: 66%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

W
W

 7 / 16 mph 70 / 70°F 65% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
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