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Alverstoke 14 Day Long Range Forecast

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

Hampshire, United Kingdom

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

The outlook for Alverstoke in the two weeks ahead shows the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the afternoon of Friday 24th. 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. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 19.0mm. On the whole winds are likely to be moderate.

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

ESE
ESE

 11 / 13 mph 62 / 60°F 80% 1005 mb
Low level cloud: 27%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 13 / 16 mph 61 / 59°F 83% 1005 mb
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 13 / 18 mph 58 / 55°F 88% 1006 mb
Low level cloud: 10%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

E
E

 9 / 14 mph 57 / 54°F 91% 1006 mb
Low level cloud: 17%
Mid level cloud: 9%
High level cloud: 72%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 6 / 11 mph 55 / 53°F 91% 1006 mb
Low level cloud: 16%
Mid level cloud: 69%
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

E
E

 5 / 9 mph 55 / 52°F 91% 1006 mb
Low level cloud: 34%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 6 / 8 mph 58 / 55°F 87% 1006 mb
Low level cloud: 26%
Mid level cloud: 45%
High level cloud: 53%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 7 / 9 mph 60 / 59°F 83% 1006 mb
Low level cloud: 9%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 6 / 7 mph 64 / 61°F 79% 1006 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 3 / 4 mph 63 / 61°F 80% 1006 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 13%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 3 / 4 mph 59 / 59°F 83% 1006 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

SSW
SSW

 3 / 4 mph 57 / 57°F 79% 1007 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 1 / 2 mph 54 / 55°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 2 / 4 mph 55 / 54°F 75% 1008 mb
Low level cloud: 9%
Mid level cloud: 10%
High level cloud: 28%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 5 / 9 mph 56 / 54°F 78% 1009 mb
Low level cloud: 33%
Mid level cloud: 15%
High level cloud: 47%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 9 / 13 mph 58 / 55°F 82% 1010 mb
Low level cloud: 15%
Mid level cloud: 27%
High level cloud: 82%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 7 / 9 mph 60 / 58°F 80% 1011 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 4 / 5 mph 60 / 59°F 81% 1011 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 2 / 3 mph 57 / 58°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNE
NNE

 2 / 2 mph 56 / 56°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 93%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 3 / 5 mph 55 / 56°F 82% 1013 mb
Low level cloud: 0%
Mid level cloud: 37%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 5 / 8 mph 55 / 53°F 85% 1013 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 60%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 3 / 5 mph 58 / 57°F 85% 1014 mb
Low level cloud: 27%
Mid level cloud: 35%
High level cloud: 54%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 6 / 9 mph 62 / 60°F 84% 1014 mb
Low level cloud: 36%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

 6 / 8 mph 65 / 62°F 83% 1014 mb
Low level cloud: 6%
Mid level cloud: 25%
High level cloud: 60%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 4 / 6 mph 64 / 61°F 87% 1014 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 2 / 3 mph 59 / 59°F 89% 1014 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NE
NE

 9 / 15 mph 55 / 52°F 93% 1014 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 27%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 15 mph 54 / 51°F 92% 1014 mb
Low level cloud: 34%
Mid level cloud: 52%
High level cloud: 4%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 10 / 15 mph 55 / 51°F 90% 1015 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 15 mph 56 / 52°F 88% 1016 mb
Low level cloud: 32%
Mid level cloud: 44%
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

NE
NE

 9 / 10 mph 61 / 60°F 83% 1016 mb
Low level cloud: 75%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 7 / 9 mph 66 / 64°F 71% 1015 mb
Low level cloud: 50%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 11 / 14 mph 63 / 62°F 83% 1015 mb
Low level cloud: 8%
Mid level cloud: 32%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 12 / 20 mph 55 / 52°F 91% 1017 mb
Low level cloud: 21%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 15 / 23 mph 50 / 45°F 93% 1017 mb
Low level cloud: 57%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 15 / 22 mph 49 / 43°F 90% 1017 mb
Low level cloud: 29%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 14 / 20 mph 50 / 44°F 86% 1018 mb
Low level cloud: 10%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 13 / 15 mph 58 / 54°F 75% 1018 mb
Low level cloud: 43%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 11 / 12 mph 64 / 62°F 69% 1017 mb
Low level cloud: 29%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 9 / 11 mph 65 / 64°F 69% 1016 mb
Low level cloud: 75%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 7 / 8 mph 64 / 62°F 78% 1016 mb
Low level cloud: 54%
Mid level cloud: 26%
High level cloud: 1%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 8 / 13 mph 54 / 52°F 83% 1017 mb
Low level cloud: 13%
Mid level cloud: 15%
High level cloud: 5%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NE
NE

 10 / 17 mph 49 / 45°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 38%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 10 / 18 mph 46 / 42°F 85% 1015 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 11 / 17 mph 48 / 42°F 83% 1015 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 9 / 11 mph 60 / 57°F 69% 1014 mb
Low level cloud: 36%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 8 / 10 mph 65 / 64°F 74% 1013 mb
Low level cloud: 56%
Mid level cloud: 47%
High level cloud: 49%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 8 / 10 mph 67 / 66°F 80% 1012 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 7 / 11 mph 67 / 65°F 90% 1011 mb
Low level cloud: 22%
Mid level cloud: 25%
High level cloud: 34%
Most Significant Cloud Type: low
35%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ENE
ENE

 12 / 15 mph 57 / 54°F 92% 1012 mb
Low level cloud: 42%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
60%
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

W
W

 11 / 22 mph 55 / 52°F 94% 1011 mb
Low level cloud: 40%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
06:00

E
E

 4 / 8 mph 55 / 55°F 90% 1012 mb
Low level cloud: 61%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
12:00

NNW
NNW

 7 / 15 mph 59 / 59°F 95% 1011 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 8 / 17 mph 62 / 62°F 83% 1012 mb
Low level cloud: 37%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
55%
0.0 In
Thu 23
May		00:00

WNW
WNW

 4 / 8 mph 64 / 64°F 88% 1013 mb
Low level cloud: 13%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
06:00

WSW
WSW

 4 / 9 mph 59 / 59°F 88% 1022 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

NNW
NNW

 20 / 41 mph 56 / 51°F 92% 1019 mb
Low level cloud: 93%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 4 / 8 mph 62 / 62°F 86% 1017 mb
Low level cloud: 27%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
43%
0.0 In
Fri 24
May		00:00

ENE
ENE

 14 / 28 mph 55 / 52°F 98% 1017 mb
Low level cloud: 100%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
06:00

NNE
NNE

 13 / 27 mph 53 / 49°F 87% 1017 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
5%
0.0 In
12:00

SSE
SSE

 8 / 16 mph 58 / 57°F 82% 1021 mb
Low level cloud: 13%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
16%
0.0 In
18:00

ENE
ENE

 10 / 20 mph 64 / 64°F 79% 1016 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
Sat 25
May		00:00

ESE
ESE

 3 / 6 mph 66 / 66°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NNE
NNE

 11 / 22 mph 52 / 48°F 86% 1018 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: high
96%
0.0 In
12:00

S
S

 7 / 15 mph 63 / 63°F 78% 1020 mb
Low level cloud: 36%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
37%
0.0 In
18:00

N
N

 7 / 15 mph 64 / 64°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
Sun 26
May		00:00

NNW
NNW

 6 / 13 mph 57 / 56°F 82% 1019 mb
Low level cloud: 29%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
46%
0.0 In
06:00

NNE
NNE

 6 / 13 mph 57 / 56°F 82% 1016 mb
Low level cloud: 61%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
12:00

E
E

 11 / 23 mph 66 / 66°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.1 In
18:00

NW
NW

 5 / 11 mph 67 / 67°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
Mon 27
May		00:00

NE
NE

 18 / 37 mph 59 / 55°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.1 In
06:00

N
N

 11 / 23 mph 53 / 50°F 77% 1019 mb
Low level cloud: 62%
Mid level cloud: 45%
High level cloud: 65%
Most Significant Cloud Type: low
85%
0.0 In
12:00

ENE
ENE

 21 / 44 mph 60 / 60°F 61% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
18:00

NW
NW

 9 / 19 mph 61 / 61°F 74% 1018 mb
Low level cloud: 12%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
Tue 28
May		00:00

NNE
NNE

 22 / 46 mph 55 / 50°F 76% 1009 mb
Low level cloud: 74%
Mid level cloud: 54%
High level cloud: 48%
Most Significant Cloud Type: low
99%
0.0 In
06:00

NNW
NNW

 11 / 24 mph 53 / 49°F 78% 1020 mb
Low level cloud: 82%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: low
83%
0.0 In
12:00

E
E

 11 / 23 mph 60 / 60°F 79% 1005 mb
Low level cloud: 44%
Mid level cloud: 79%
High level cloud: 34%
Most Significant Cloud Type: low
75%
0.1 In
18:00

NNW
NNW

 9 / 18 mph 61 / 61°F 70% 1021 mb
Low level cloud: 17%
Mid level cloud: 2%
High level cloud: 21%
Most Significant Cloud Type: low
20%
0.0 In
Wed 29
May		00:00

ENE
ENE

 9 / 18 mph 56 / 54°F 90% 1006 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.1 In
06:00

WNW
WNW

 7 / 15 mph 54 / 52°F 79% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

SE
SE

 7 / 15 mph 60 / 60°F 87% 1006 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 93%
Most Significant Cloud Type: low
46%
0.0 In
18:00

WSW
WSW

 15 / 32 mph 60 / 60°F 79% 1017 mb
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 21%
Most Significant Cloud Type: low
22%
0.0 In
Thu 30
May		00:00

ESE
ESE

 5 / 11 mph 58 / 58°F 90% 1007 mb
Low level cloud: 11%
Mid level cloud: 63%
High level cloud: 59%
Most Significant Cloud Type: medium
95%
0.0 In
06:00

W
W

 12 / 25 mph 54 / 50°F 86% 1016 mb
Low level cloud: 40%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
54%
0.0 In
12:00

SW
SW

 10 / 21 mph 60 / 60°F 78% 1007 mb
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 41%
Most Significant Cloud Type: medium
57%
0.0 In
18:00

W
W

 11 / 22 mph 61 / 61°F 82% 1014 mb
Low level cloud: 60%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: low
67%
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