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Avon 14 Day Long Range Forecast

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

Hampshire, United Kingdom

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

The outlook for Avon in the two weeks ahead shows the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 32°C expected on the afternoon of Sunday 29th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Thursday 26th at 9°C. The coming 14 days will have mostly dry days although Wednesday 25th and Tuesday 24th are likely to see a little rain. Current predictions suggest Wednesday 25th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 20
Jun		18:00

ESE
ESE

 10 / 14 mph 77 / 78°F 53% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 7 / 15 mph 68 / 66°F 67% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Jun		00:00

ESE
ESE

 7 / 15 mph 64 / 64°F 66% 1019 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 8 / 17 mph 62 / 62°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 9 / 15 mph 68 / 66°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 11 / 16 mph 74 / 76°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 20%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 13 / 15 mph 79 / 79°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 11 / 14 mph 82 / 81°F 51% 1015 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 9 / 13 mph 81 / 81°F 56% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 5 / 11 mph 69 / 67°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 17%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Jun		00:00

WNW
WNW

 8 / 14 mph 59 / 57°F 96% 1014 mb
Low level cloud: 24%
Mid level cloud: 7%
High level cloud: 20%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 7 / 14 mph 55 / 53°F 96% 1015 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 7 / 11 mph 59 / 56°F 90% 1015 mb
Low level cloud: 30%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 15 mph 69 / 68°F 61% 1015 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 18 / 21 mph 72 / 76°F 55% 1014 mb
Low level cloud: 78%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 18 / 22 mph 70 / 69°F 65% 1014 mb
Low level cloud: 71%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 16 / 22 mph 68 / 66°F 60% 1013 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 13 / 21 mph 61 / 59°F 81% 1014 mb
Low level cloud: 46%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 23
Jun		00:00

WSW
WSW

 13 / 21 mph 55 / 52°F 86% 1014 mb
Low level cloud: 72%
Mid level cloud: 15%
High level cloud: 6%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 14 / 20 mph 56 / 53°F 92% 1014 mb
Low level cloud: 99%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 13 / 18 mph 55 / 51°F 80% 1015 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 17 / 19 mph 63 / 61°F 52% 1016 mb
Low level cloud: 56%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 18 / 21 mph 67 / 66°F 45% 1017 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 17 / 19 mph 67 / 66°F 48% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 15 / 20 mph 63 / 62°F 59% 1017 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 10 / 17 mph 55 / 51°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 76%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 24
Jun		00:00

WSW
WSW

 7 / 12 mph 52 / 49°F 94% 1018 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 40%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 5 / 9 mph 53 / 51°F 89% 1017 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 10 / 13 mph 57 / 55°F 82% 1016 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 11 / 15 mph 62 / 62°F 73% 1016 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 12 / 14 mph 71 / 71°F 64% 1015 mb
Low level cloud: 88%
Mid level cloud: 46%
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

W
W

 8 / 10 mph 75 / 76°F 66% 1013 mb
Low level cloud: 58%
Mid level cloud: 22%
High level cloud: 10%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 10 / 13 mph 74 / 76°F 66% 1012 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 95%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 5 / 9 mph 64 / 61°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 25
Jun		00:00

N
N

 0 / 1 mph 58 / 58°F 90% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 72%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 5 / 9 mph 59 / 59°F 82% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 5 / 8 mph 63 / 60°F 77% 1008 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 97%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 6 / 7 mph 72 / 68°F 58% 1006 mb
Low level cloud: 24%
Mid level cloud: 45%
High level cloud: 19%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 9 / 10 mph 76 / 76°F 47% 1005 mb
Low level cloud: 27%
Mid level cloud: 44%
High level cloud: 22%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 13 / 18 mph 67 / 66°F 57% 1005 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 2%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 16 / 21 mph 65 / 65°F 72% 1004 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 11 / 16 mph 54 / 51°F 96% 1006 mb
Low level cloud: 68%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 26
Jun		00:00

W
W

 12 / 19 mph 52 / 49°F 94% 1007 mb
Low level cloud: 35%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 11 / 18 mph 50 / 46°F 95% 1008 mb
Low level cloud: 37%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 12 / 17 mph 52 / 48°F 92% 1010 mb
Low level cloud: 19%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 16 / 18 mph 62 / 60°F 65% 1012 mb
Low level cloud: 66%
Mid level cloud: 23%
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

W
W

 17 / 20 mph 67 / 66°F 49% 1014 mb
Low level cloud: 60%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 15 / 17 mph 69 / 67°F 49% 1015 mb
Low level cloud: 53%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 14 / 19 mph 67 / 66°F 52% 1017 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 6 / 11 mph 59 / 56°F 82% 1020 mb
Low level cloud: 44%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 27
Jun		00:00

SW
SW

 14 / 22 mph 61 / 61°F 94% 1018 mb
Low level cloud: 56%
Mid level cloud: 2%
High level cloud: 50%
Most Significant Cloud Type: low
62%
0.0 In
06:00

SSW
SSW

 22 / 34 mph 62 / 62°F 89% 1009 mb
Low level cloud: 100%
Mid level cloud: 16%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

 8 / 9 mph 78 / 79°F 47% 1024 mb
Low level cloud: 73%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.0 In
18:00

SW
SW

 6 / 10 mph 83 / 85°F 56% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 8%
Most Significant Cloud Type: medium
10%
0.0 In
Sat 28
Jun		00:00

S
S

 5 / 10 mph 61 / 61°F 95% 1018 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
12%
0.0 In
06:00

NW
NW

 6 / 9 mph 63 / 63°F 92% 1026 mb
Low level cloud: 50%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
12:00

NE
NE

 4 / 6 mph 83 / 82°F 38% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 90%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

WNW
WNW

 4 / 5 mph 86 / 89°F 48% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 29
Jun		00:00

NNW
NNW

 3 / 5 mph 68 / 68°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 36%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NW
NW

 3 / 4 mph 68 / 68°F 73% 1018 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

 3 / 5 mph 87 / 88°F 39% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

W
W

 6 / 9 mph 84 / 83°F 32% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 30
Jun		00:00

NNW
NNW

 3 / 4 mph 72 / 76°F 81% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NW
NW

 10 / 15 mph 63 / 63°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
0.0 In
12:00

WNW
WNW

 7 / 11 mph 86 / 86°F 40% 1013 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 54%
Most Significant Cloud Type: medium
12%
0.0 In
18:00

NW
NW

 15 / 22 mph 69 / 69°F 49% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
Tue 01
Jul		00:00

NNW
NNW

 8 / 15 mph 65 / 65°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: medium
49%
0.0 In
06:00

NE
NE

 3 / 4 mph 60 / 60°F 57% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

N
N

 12 / 21 mph 62 / 62°F 81% 1015 mb
Low level cloud: 91%
Mid level cloud: 10%
High level cloud: 16%
Most Significant Cloud Type: low
96%
0.1 In
18:00

SE
SE

 10 / 13 mph 73 / 75°F 34% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Wed 02
Jul		00:00

N
N

 12 / 22 mph 57 / 54°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

W
W

 2 / 2 mph 66 / 66°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 56%
Most Significant Cloud Type: medium
31%
0.0 In
12:00

N
N

 15 / 27 mph 65 / 65°F 42% 1017 mb
Low level cloud: 11%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
0.0 In
18:00

W
W

 19 / 27 mph 68 / 68°F 51% 1015 mb
Low level cloud: 14%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Thu 03
Jul		00:00

N
N

 8 / 15 mph 52 / 49°F 75% 1022 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

WSW
WSW

 6 / 8 mph 54 / 53°F 79% 1020 mb
Low level cloud: 12%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
39%
0.0 In
12:00

NW
NW

 10 / 17 mph 69 / 69°F 38% 1025 mb
Low level cloud: 2%
Mid level cloud: 75%
High level cloud: 6%
Most Significant Cloud Type: medium
82%
0.0 In
18:00

WNW
WNW

 15 / 21 mph 64 / 64°F 43% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
Fri 04
Jul		00:00

NW
NW

 8 / 16 mph 53 / 51°F 87% 1026 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 8%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

SW
SW

 4 / 6 mph 57 / 57°F 85% 1021 mb
Low level cloud: 15%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: low
20%
0.0 In
12:00

W
W

 9 / 15 mph 74 / 76°F 37% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

SW
SW

 15 / 22 mph 65 / 65°F 61% 1018 mb
Low level cloud: 35%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
Sat 05
Jul		00:00

NW
NW

 7 / 14 mph 57 / 55°F 95% 1023 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
4%
0.0 In
06:00

WSW
WSW

 9 / 13 mph 61 / 61°F 95% 1018 mb
Low level cloud: 68%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: low
75%
0.1 In
12:00

WSW
WSW

 6 / 12 mph 79 / 78°F 34% 1021 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
18:00

WNW
WNW

 15 / 21 mph 70 / 70°F 67% 1021 mb
Low level cloud: 71%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
72%
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