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Hounslow 14 Day Long Range Forecast

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

Middlesex, United Kingdom

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

For Hounslow in the coming two weeks the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 30°C expected on the afternoon of Tuesday 29th. The mean minimum temperature will be 16°C, dipping to its lowest on the morning of Monday 28th at 13°C. The coming 14 days will have mixed weather with some days dry and some seeing a little rain. Predictions are Monday 21st 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
Sun 20
Jul		18:00

SSW
SSW

 11 / 13 mph 73 / 76°F 49% 999 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 6 / 9 mph 67 / 64°F 68% 1000 mb
Low level cloud: 11%
Mid level cloud: 31%
High level cloud: 18%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 21
Jul		00:00

SE
SE

 6 / 8 mph 61 / 61°F 86% 999 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 4 / 6 mph 59 / 59°F 94% 998 mb
Low level cloud: 47%
Mid level cloud: 40%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 1 / 2 mph 63 / 60°F 90% 998 mb
Low level cloud: 50%
Mid level cloud: 28%
High level cloud: 35%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 4 / 5 mph 69 / 66°F 69% 999 mb
Low level cloud: 54%
Mid level cloud: 27%
High level cloud: 19%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 4 / 5 mph 77 / 76°F 47% 999 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 8 / 10 mph 75 / 76°F 43% 1000 mb
Low level cloud: 0%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 10 / 13 mph 75 / 76°F 47% 1002 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 27%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 10 / 14 mph 69 / 67°F 59% 1005 mb
Low level cloud: 9%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 22
Jul		00:00

W
W

 7 / 8 mph 64 / 64°F 75% 1006 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 6 / 7 mph 60 / 60°F 87% 1007 mb
Low level cloud: 18%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 7 / 9 mph 61 / 60°F 82% 1009 mb
Low level cloud: 71%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 9 / 11 mph 68 / 67°F 65% 1010 mb
Low level cloud: 92%
Mid level cloud: 79%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 8 / 9 mph 75 / 76°F 49% 1010 mb
Low level cloud: 69%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 11 / 13 mph 76 / 76°F 46% 1010 mb
Low level cloud: 28%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 8 / 10 mph 72 / 76°F 51% 1011 mb
Low level cloud: 19%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 6 / 9 mph 70 / 67°F 65% 1012 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 23
Jul		00:00

WNW
WNW

 4 / 5 mph 65 / 65°F 76% 1013 mb
Low level cloud: 8%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 4 / 6 mph 60 / 60°F 87% 1013 mb
Low level cloud: 24%
Mid level cloud: 32%
High level cloud: 37%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 6 / 8 mph 60 / 58°F 84% 1014 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 9 / 10 mph 69 / 67°F 60% 1014 mb
Low level cloud: 48%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 9 / 11 mph 74 / 76°F 42% 1013 mb
Low level cloud: 24%
Mid level cloud: 98%
High level cloud: 14%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 8 / 9 mph 76 / 76°F 44% 1013 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 9 / 10 mph 73 / 76°F 50% 1014 mb
Low level cloud: 1%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 6 / 8 mph 68 / 65°F 60% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Jul		00:00

NW
NW

 7 / 8 mph 63 / 63°F 69% 1016 mb
Low level cloud: 7%
Mid level cloud: 22%
High level cloud: 26%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 6 / 8 mph 59 / 58°F 84% 1016 mb
Low level cloud: 52%
Mid level cloud: 31%
High level cloud: 16%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 8 / 10 mph 62 / 60°F 82% 1017 mb
Low level cloud: 56%
Mid level cloud: 38%
High level cloud: 26%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 7 / 9 mph 68 / 66°F 62% 1018 mb
Low level cloud: 38%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 6 / 7 mph 73 / 76°F 48% 1017 mb
Low level cloud: 97%
Mid level cloud: 30%
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

NW
NW

 3 / 4 mph 76 / 76°F 47% 1017 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 2 / 2 mph 77 / 76°F 46% 1017 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 13%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 7 / 8 mph 70 / 67°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 100%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 25
Jul		00:00

ENE
ENE

 3 / 4 mph 65 / 65°F 78% 1019 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 3 / 5 mph 63 / 63°F 81% 1019 mb
Low level cloud: 9%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 5 / 7 mph 64 / 62°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 6 / 8 mph 72 / 69°F 46% 1020 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
12:00

NW
NW

 6 / 7 mph 80 / 77°F 31% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 6 / 7 mph 84 / 79°F 26% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 5 / 6 mph 84 / 79°F 30% 1019 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 3 / 4 mph 76 / 76°F 45% 1019 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 68%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 26
Jul		00:00

NNW
NNW

 8 / 9 mph 70 / 70°F 64% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 13%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 8 / 9 mph 64 / 64°F 69% 1021 mb
Low level cloud: 15%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 7 / 9 mph 64 / 62°F 66% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 8 / 9 mph 72 / 70°F 51% 1022 mb
Low level cloud: 10%
Mid level cloud: 8%
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

NW
NW

 9 / 10 mph 80 / 78°F 38% 1021 mb
Low level cloud: 16%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 10 / 11 mph 84 / 80°F 32% 1020 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 13%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 10 / 11 mph 84 / 80°F 29% 1019 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 12 / 14 mph 71 / 71°F 48% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 27
Jul		00:00

NW
NW

 7 / 15 mph 69 / 69°F 61% 1022 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

WNW
WNW

 4 / 9 mph 65 / 65°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

WSW
WSW

 5 / 10 mph 82 / 81°F 39% 1021 mb
Low level cloud: 18%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: low
22%
0.0 In
18:00

NNW
NNW

 11 / 23 mph 79 / 79°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: medium
24%
0.0 In
Mon 28
Jul		00:00

W
W

 9 / 19 mph 60 / 60°F 77% 1009 mb
Low level cloud: 51%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
06:00

WNW
WNW

 6 / 12 mph 62 / 62°F 70% 1020 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
0.0 In
12:00

WNW
WNW

 14 / 30 mph 75 / 76°F 38% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
18:00

W
W

 10 / 20 mph 79 / 80°F 47% 1021 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: medium
43%
0.0 In
Tue 29
Jul		00:00

S
S

 2 / 3 mph 74 / 77°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

NE
NE

 5 / 10 mph 67 / 67°F 68% 1023 mb
Low level cloud: 1%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
0.0 In
12:00

WNW
WNW

 6 / 13 mph 82 / 81°F 38% 1023 mb
Low level cloud: 20%
Mid level cloud: 15%
High level cloud: 5%
Most Significant Cloud Type: low
26%
0.0 In
18:00

SSE
SSE

 7 / 15 mph 78 / 79°F 48% 1022 mb
Low level cloud: 4%
Mid level cloud: 50%
High level cloud: 5%
Most Significant Cloud Type: medium
59%
0.0 In
Wed 30
Jul		00:00

NNW
NNW

 6 / 12 mph 74 / 77°F 66% 1023 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
06:00

SSW
SSW

 5 / 11 mph 68 / 68°F 66% 1022 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
0.0 In
12:00

NW
NW

 5 / 10 mph 79 / 80°F 44% 1022 mb
Low level cloud: 80%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: low
88%
0.0 In
18:00

S
S

 9 / 19 mph 86 / 85°F 34% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: medium
9%
0.0 In
Thu 31
Jul		00:00

WNW
WNW

 7 / 14 mph 76 / 78°F 56% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

WSW
WSW

 4 / 9 mph 74 / 77°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

WSW
WSW

 5 / 9 mph 92 / 91°F 28% 1019 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 20%
Most Significant Cloud Type: medium
15%
0.0 In
18:00

W
W

 7 / 14 mph 91 / 90°F 32% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Fri 01
Aug		00:00

W
W

 5 / 10 mph 80 / 80°F 44% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
06:00

NNW
NNW

 8 / 17 mph 67 / 67°F 64% 1018 mb
Low level cloud: 73%
Mid level cloud: 21%
High level cloud: 20%
Most Significant Cloud Type: low
82%
0.0 In
12:00

WSW
WSW

 9 / 17 mph 91 / 88°F 22% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

N
N

 10 / 20 mph 84 / 81°F 24% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 02
Aug		00:00

N
N

 11 / 20 mph 72 / 76°F 45% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 18%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NE
NE

 6 / 14 mph 68 / 68°F 62% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

N
N

 3 / 7 mph 83 / 80°F 26% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 99%
Most Significant Cloud Type: medium
25%
0.0 In
18:00

E
E

 12 / 25 mph 74 / 76°F 39% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 03
Aug		00:00

SE
SE

 6 / 12 mph 74 / 77°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

ENE
ENE

 8 / 17 mph 67 / 67°F 73% 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

SE
SE

 7 / 14 mph 89 / 85°F 21% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

E
E

 9 / 20 mph 79 / 78°F 31% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 04
Aug		00:00

ESE
ESE

 2 / 5 mph 80 / 81°F 50% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NE
NE

 6 / 12 mph 70 / 70°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

 6 / 11 mph 94 / 91°F 22% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

E
E

 8 / 16 mph 91 / 88°F 25% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
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