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Chorleywood Bottom 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Chorleywood Bottom

Hertfordshire, United Kingdom

Long range weather outlook for Chorleywood Bottom includes 14 day forecast summary:

For Chorleywood Bottom in the coming two weeks the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 17°C expected on the afternoon of Tuesday 7th. The mean minimum temperature will be 7°C, dipping to its lowest on the morning of Sunday 28th at 3°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Sunday 28th will have the most precipitation with an accumulation of around 31.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 28
Apr		18:00

SW
SW

 11 / 16 mph 48 / 43°F 84% 1010 mb
Low level cloud: 3%
Mid level cloud: 38%
High level cloud: 76%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 7 / 12 mph 44 / 40°F 93% 1012 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr		00:00

SSW
SSW

 7 / 11 mph 42 / 38°F 92% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 8 / 15 mph 39 / 34°F 94% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 9 / 15 mph 42 / 36°F 94% 1014 mb
Low level cloud: 7%
Mid level cloud: 35%
High level cloud: 92%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 17 / 23 mph 51 / 45°F 76% 1015 mb
Low level cloud: 72%
Mid level cloud: 24%
High level cloud: 32%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 19 / 24 mph 55 / 50°F 63% 1014 mb
Low level cloud: 63%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 18 / 24 mph 55 / 50°F 68% 1014 mb
Low level cloud: 15%
Mid level cloud: 29%
High level cloud: 97%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 15 / 22 mph 53 / 48°F 76% 1014 mb
Low level cloud: 8%
Mid level cloud: 23%
High level cloud: 26%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 10 / 17 mph 49 / 44°F 84% 1015 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 30
Apr		00:00

SSE
SSE

 9 / 15 mph 48 / 43°F 87% 1014 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 7 / 13 mph 46 / 42°F 94% 1014 mb
Low level cloud: 6%
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
06:00

SE
SE

 7 / 12 mph 47 / 43°F 91% 1013 mb
Low level cloud: 47%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 14 / 19 mph 54 / 50°F 76% 1011 mb
Low level cloud: 22%
Mid level cloud: 96%
High level cloud: 36%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 14 / 18 mph 56 / 53°F 74% 1010 mb
Low level cloud: 78%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 13 / 17 mph 59 / 56°F 69% 1009 mb
Low level cloud: 58%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 9 / 11 mph 59 / 56°F 76% 1009 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 7 / 11 mph 51 / 49°F 94% 1010 mb
Low level cloud: 21%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May		00:00

SSE
SSE

 4 / 8 mph 50 / 49°F 92% 1010 mb
Low level cloud: 31%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 2 / 3 mph 48 / 48°F 95% 1010 mb
Low level cloud: 38%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 2 / 3 mph 50 / 49°F 93% 1010 mb
Low level cloud: 30%
Mid level cloud: 19%
High level cloud: 83%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 6 / 8 mph 56 / 55°F 77% 1010 mb
Low level cloud: 21%
Mid level cloud: 62%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 8 / 11 mph 58 / 57°F 78% 1009 mb
Low level cloud: 71%
Mid level cloud: 100%
High level cloud: 71%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 4 / 6 mph 56 / 55°F 94% 1008 mb
Low level cloud: 79%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

E
E

 4 / 6 mph 55 / 54°F 96% 1008 mb
Low level cloud: 97%
Mid level cloud: 99%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 4 / 8 mph 54 / 53°F 97% 1007 mb
Low level cloud: 70%
Mid level cloud: 92%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May		00:00

N
N

 9 / 15 mph 50 / 46°F 98% 1005 mb
Low level cloud: 82%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 10 / 16 mph 48 / 43°F 98% 1004 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 9 / 17 mph 47 / 42°F 98% 1002 mb
Low level cloud: 96%
Mid level cloud: 66%
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

 4 / 6 mph 49 / 48°F 98% 1002 mb
Low level cloud: 100%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 10 mph 52 / 49°F 98% 1003 mb
Low level cloud: 90%
Mid level cloud: 96%
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

 13 / 15 mph 54 / 50°F 95% 1004 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 15 / 17 mph 53 / 48°F 92% 1006 mb
Low level cloud: 94%
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
21:00

WSW
WSW

 14 / 19 mph 50 / 45°F 92% 1008 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May		00:00

WSW
WSW

 13 / 19 mph 47 / 41°F 93% 1009 mb
Low level cloud: 57%
Mid level cloud: 41%
High level cloud: 11%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 13 / 19 mph 45 / 39°F 93% 1010 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 12 / 18 mph 46 / 40°F 91% 1010 mb
Low level cloud: 28%
Mid level cloud: 31%
High level cloud: 99%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 17 mph 52 / 47°F 72% 1011 mb
Low level cloud: 1%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 12 / 17 mph 56 / 51°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 11 / 15 mph 58 / 55°F 65% 1010 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 11 / 15 mph 57 / 53°F 79% 1011 mb
Low level cloud: 13%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 7 / 11 mph 50 / 47°F 92% 1012 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 35%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May		00:00

S
S

 6 / 9 mph 47 / 45°F 94% 1011 mb
Low level cloud: 16%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 4 / 9 mph 45 / 43°F 95% 1010 mb
Low level cloud: 24%
Mid level cloud: 66%
High level cloud: 29%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 5 / 9 mph 47 / 45°F 95% 1009 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 6 / 9 mph 50 / 47°F 90% 1008 mb
Low level cloud: 65%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 11 / 15 mph 53 / 50°F 80% 1007 mb
Low level cloud: 95%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 8 / 11 mph 54 / 50°F 81% 1006 mb
Low level cloud: 69%
Mid level cloud: 30%
High level cloud: 6%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 9 / 14 mph 53 / 49°F 87% 1006 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

 8 / 14 mph 48 / 44°F 96% 1007 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 05
May		00:00

SSW
SSW

 7 / 13 mph 54 / 52°F 94% 1006 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

 12 / 22 mph 44 / 38°F 96% 1011 mb
Low level cloud: 82%
Mid level cloud: 33%
High level cloud: 36%
Most Significant Cloud Type: low
97%
0.0 In
12:00

WSW
WSW

 10 / 20 mph 59 / 57°F 66% 1011 mb
Low level cloud: 40%
Mid level cloud: 26%
High level cloud: 5%
Most Significant Cloud Type: low
49%
0.0 In
18:00

NW
NW

 8 / 16 mph 66 / 66°F 85% 1012 mb
Low level cloud: 67%
Mid level cloud: 30%
High level cloud: 7%
Most Significant Cloud Type: low
78%
0.0 In
Mon 06
May		00:00

N
N

 6 / 11 mph 45 / 42°F 89% 1023 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
06:00

NNE
NNE

 13 / 28 mph 44 / 37°F 92% 1010 mb
Low level cloud: 93%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 12 / 23 mph 55 / 52°F 61% 1019 mb
Low level cloud: 71%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
74%
0.0 In
18:00

NNW
NNW

 6 / 14 mph 62 / 62°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 93%
Most Significant Cloud Type: medium
34%
0.0 In
Tue 07
May		00:00

NNW
NNW

 5 / 11 mph 54 / 53°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

 8 / 17 mph 50 / 47°F 89% 1018 mb
Low level cloud: 72%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
12:00

NE
NE

 5 / 11 mph 62 / 62°F 67% 1024 mb
Low level cloud: 79%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
79%
0.0 In
18:00

NNE
NNE

 11 / 24 mph 55 / 52°F 86% 1021 mb
Low level cloud: 39%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
Wed 08
May		00:00

ENE
ENE

 5 / 10 mph 56 / 55°F 90% 1029 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

ENE
ENE

 9 / 18 mph 48 / 44°F 96% 1026 mb
Low level cloud: 74%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
12:00

NE
NE

 11 / 23 mph 61 / 61°F 64% 1029 mb
Low level cloud: 44%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
18:00

E
E

 11 / 24 mph 57 / 55°F 80% 1027 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
Thu 09
May		00:00

NE
NE

 8 / 17 mph 49 / 45°F 92% 1031 mb
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
06:00

ENE
ENE

 9 / 20 mph 49 / 45°F 88% 1028 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
12:00

NE
NE

 19 / 39 mph 59 / 55°F 60% 1029 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
8%
0.0 In
18:00

E
E

 13 / 26 mph 53 / 49°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
Fri 10
May		00:00

NNE
NNE

 12 / 24 mph 47 / 42°F 91% 1028 mb
Low level cloud: 65%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
66%
0.0 In
06:00

E
E

 13 / 28 mph 47 / 41°F 85% 1024 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

 16 / 33 mph 61 / 61°F 66% 1025 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
18:00

E
E

 16 / 33 mph 54 / 50°F 67% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 11
May		00:00

NE
NE

 10 / 21 mph 51 / 47°F 93% 1023 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
06:00

E
E

 12 / 25 mph 50 / 46°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

ENE
ENE

 15 / 32 mph 64 / 64°F 60% 1019 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
5%
0.0 In
18:00

E
E

 13 / 28 mph 58 / 55°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 12
May		00:00

NE
NE

 11 / 23 mph 49 / 44°F 93% 1018 mb
Low level cloud: 21%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
06:00

ENE
ENE

 12 / 26 mph 53 / 49°F 92% 1020 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
12:00

ENE
ENE

 15 / 30 mph 62 / 62°F 69% 1015 mb
Low level cloud: 80%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
96%
0.0 In
18:00

ENE
ENE

 13 / 28 mph 59 / 56°F 67% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 13
May		00:00

NE
NE

 13 / 27 mph 44 / 38°F 84% 1015 mb
Low level cloud: 5%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

NE
NE

 10 / 22 mph 51 / 47°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

ENE
ENE

 16 / 34 mph 57 / 53°F 65% 1012 mb
Low level cloud: 40%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
58%
0.0 In
18:00

ENE
ENE

 11 / 23 mph 64 / 65°F 71% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
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