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Shalcombe 14 Day Long Range Forecast

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

Hampshire, United Kingdom

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

For Shalcombe in the coming two weeks the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 22°C expected on the afternoon of Monday 20th. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Tuesday 21st at 8°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 28th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

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

W
W

 4 / 6 mph 66 / 63°F 89% 1012 mb
Low level cloud: 32%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 5 / 7 mph 61 / 61°F 91% 1013 mb
Low level cloud: 31%
Mid level cloud: 22%
High level cloud: 56%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 7 / 11 mph 57 / 55°F 96% 1013 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 65%
Most Significant Cloud Type: low
65%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNE
NNE

 9 / 15 mph 52 / 50°F 90% 1012 mb
Low level cloud: 8%
Mid level cloud: 24%
High level cloud: 10%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 7 / 12 mph 53 / 49°F 90% 1013 mb
Low level cloud: 16%
Mid level cloud: 18%
High level cloud: 8%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 7 / 9 mph 60 / 58°F 84% 1014 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 7 / 9 mph 65 / 63°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 6 / 10 mph 66 / 63°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ENE
ENE

 4 / 6 mph 65 / 62°F 86% 1013 mb
Low level cloud: 19%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

 9 / 14 mph 60 / 60°F 88% 1014 mb
Low level cloud: 5%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NE
NE

 9 / 15 mph 56 / 53°F 92% 1014 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 10 / 18 mph 52 / 49°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 12 / 19 mph 52 / 47°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 14 / 16 mph 62 / 61°F 76% 1013 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
12:00

ENE
ENE

 13 / 14 mph 70 / 68°F 72% 1012 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
15:00

ENE
ENE

 12 / 16 mph 69 / 68°F 80% 1011 mb
Low level cloud: 43%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 10 / 14 mph 68 / 66°F 86% 1010 mb
Low level cloud: 4%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

 9 / 15 mph 56 / 54°F 92% 1011 mb
Low level cloud: 22%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 13 / 21 mph 52 / 47°F 90% 1010 mb
Low level cloud: 8%
Mid level cloud: 15%
High level cloud: 2%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 12 / 21 mph 48 / 43°F 85% 1009 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
06:00

NNE
NNE

 11 / 19 mph 49 / 44°F 85% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 10 / 15 mph 55 / 50°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 100%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 6 / 6 mph 63 / 63°F 75% 1008 mb
Low level cloud: 5%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 2 / 3 mph 66 / 66°F 74% 1008 mb
Low level cloud: 35%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 6 / 7 mph 67 / 65°F 83% 1008 mb
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 6 / 8 mph 62 / 62°F 90% 1009 mb
Low level cloud: 32%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

NNW
NNW

 7 / 11 mph 57 / 56°F 90% 1008 mb
Low level cloud: 35%
Mid level cloud: 53%
High level cloud: 99%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 7 / 12 mph 55 / 53°F 91% 1008 mb
Low level cloud: 35%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 9 / 16 mph 54 / 51°F 89% 1008 mb
Low level cloud: 15%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 12 / 20 mph 57 / 54°F 81% 1008 mb
Low level cloud: 49%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 11 / 15 mph 63 / 61°F 79% 1008 mb
Low level cloud: 37%
Mid level cloud: 36%
High level cloud: 99%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 11 / 16 mph 65 / 63°F 82% 1008 mb
Low level cloud: 35%
Mid level cloud: 15%
High level cloud: 33%
Most Significant Cloud Type: low
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 11 / 15 mph 64 / 62°F 85% 1008 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 10 / 11 mph 60 / 60°F 87% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

WSW
WSW

 10 / 12 mph 57 / 55°F 92% 1009 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 11 / 14 mph 55 / 52°F 93% 1009 mb
Low level cloud: 37%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 11 / 21 mph 54 / 49°F 91% 1010 mb
Low level cloud: 27%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 13 / 21 mph 58 / 53°F 85% 1011 mb
Low level cloud: 35%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 11 / 13 mph 62 / 61°F 81% 1012 mb
Low level cloud: 30%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 9 / 10 mph 65 / 63°F 81% 1013 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 6 / 7 mph 65 / 62°F 83% 1013 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 11%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 5 / 5 mph 60 / 60°F 89% 1015 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 55%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

E
E

 2 / 3 mph 58 / 59°F 90% 1015 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 4 / 6 mph 54 / 54°F 89% 1015 mb
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 57%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 4 / 7 mph 54 / 53°F 89% 1015 mb
Low level cloud: 13%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 6 / 8 mph 62 / 59°F 80% 1015 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 48%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 11 mph 64 / 62°F 77% 1015 mb
Low level cloud: 11%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 10 / 14 mph 62 / 60°F 82% 1016 mb
Low level cloud: 20%
Mid level cloud: 26%
High level cloud: 37%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 9 / 14 mph 62 / 60°F 85% 1016 mb
Low level cloud: 19%
Mid level cloud: 20%
High level cloud: 16%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 9 / 15 mph 58 / 55°F 92% 1018 mb
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May		00:00

NNE
NNE

 19 / 39 mph 58 / 54°F 90% 1015 mb
Low level cloud: 99%
Mid level cloud: 13%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 6 / 12 mph 58 / 57°F 87% 1024 mb
Low level cloud: 5%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

SW
SW

 11 / 22 mph 55 / 52°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 99%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

ESE
ESE

 9 / 19 mph 63 / 63°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sun 26
May		00:00

E
E

 3 / 6 mph 62 / 62°F 93% 1014 mb
Low level cloud: 45%
Mid level cloud: 74%
High level cloud: 66%
Most Significant Cloud Type: low
79%
0.0 In
06:00

ESE
ESE

 9 / 19 mph 57 / 55°F 93% 1019 mb
Low level cloud: 16%
Mid level cloud: 57%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SW
SW

 17 / 35 mph 57 / 53°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

SSE
SSE

 8 / 17 mph 61 / 61°F 97% 1011 mb
Low level cloud: 81%
Mid level cloud: 80%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.0 In
Mon 27
May		00:00

WSW
WSW

 10 / 21 mph 58 / 56°F 93% 1017 mb
Low level cloud: 22%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
06:00

S
S

 4 / 9 mph 56 / 55°F 91% 1011 mb
Low level cloud: 58%
Mid level cloud: 100%
High level cloud: 72%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

 19 / 39 mph 59 / 55°F 85% 1017 mb
Low level cloud: 38%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: low
45%
0.0 In
18:00

ENE
ENE

 7 / 15 mph 61 / 61°F 88% 1008 mb
Low level cloud: 10%
Mid level cloud: 78%
High level cloud: 58%
Most Significant Cloud Type: medium
100%
0.1 In
Tue 28
May		00:00

SW
SW

 22 / 46 mph 56 / 51°F 97% 1014 mb
Low level cloud: 90%
Mid level cloud: 74%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WSW
WSW

 13 / 28 mph 53 / 49°F 93% 1010 mb
Low level cloud: 76%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
94%
0.1 In
12:00

SW
SW

 17 / 36 mph 58 / 55°F 82% 1014 mb
Low level cloud: 2%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
0.0 In
18:00

WSW
WSW

 11 / 23 mph 57 / 55°F 86% 1012 mb
Low level cloud: 44%
Mid level cloud: 76%
High level cloud: 11%
Most Significant Cloud Type: low
71%
0.1 In
Wed 29
May		00:00

WSW
WSW

 25 / 52 mph 56 / 50°F 97% 1010 mb
Low level cloud: 100%
Mid level cloud: 92%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.3 In
06:00

WSW
WSW

 11 / 24 mph 53 / 49°F 85% 1013 mb
Low level cloud: 83%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: low
87%
0.0 In
12:00

WSW
WSW

 17 / 36 mph 57 / 53°F 82% 1014 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
31%
0.2 In
18:00

SW
SW

 12 / 25 mph 57 / 55°F 89% 1014 mb
Low level cloud: 16%
Mid level cloud: 56%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 30
May		00:00

WNW
WNW

 10 / 20 mph 57 / 55°F 82% 1015 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 27%
Most Significant Cloud Type: medium
30%
0.0 In
06:00

SSE
SSE

 2 / 5 mph 58 / 60°F 89% 1012 mb
Low level cloud: 85%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 8 / 18 mph 58 / 56°F 77% 1017 mb
Low level cloud: 4%
Mid level cloud: 28%
High level cloud: 29%
Most Significant Cloud Type: medium
41%
0.0 In
18:00

SSW
SSW

 7 / 15 mph 63 / 64°F 93% 1007 mb
Low level cloud: 68%
Mid level cloud: 47%
High level cloud: 76%
Most Significant Cloud Type: low
93%
0.0 In
Fri 31
May		00:00

WNW
WNW

 5 / 11 mph 59 / 58°F 90% 1019 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 39%
Most Significant Cloud Type: medium
80%
0.0 In
06:00

SSW
SSW

 12 / 24 mph 55 / 52°F 90% 1005 mb
Low level cloud: 33%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
49%
0.0 In
12:00

SW
SW

 6 / 13 mph 61 / 61°F 80% 1019 mb
Low level cloud: 2%
Mid level cloud: 68%
High level cloud: 39%
Most Significant Cloud Type: medium
74%
0.0 In
18:00

SSW
SSW

 8 / 18 mph 63 / 63°F 80% 1005 mb
Low level cloud: 13%
Mid level cloud: 17%
High level cloud: 15%
Most Significant Cloud Type: low
20%
0.0 In
Sat 01
Jun		00:00

SSE
SSE

 5 / 11 mph 59 / 59°F 91% 1018 mb
Low level cloud: 87%
Mid level cloud: 98%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

 11 / 22 mph 55 / 51°F 90% 1005 mb
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: low
30%
0.0 In
12:00

SW
SW

 11 / 22 mph 61 / 61°F 89% 1017 mb
Low level cloud: 86%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: low
90%
0.1 In
18:00

SSW
SSW

 12 / 25 mph 58 / 55°F 81% 1008 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Sun 02
Jun		00:00

E
E

 13 / 28 mph 60 / 60°F 89% 1010 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 98%
Most Significant Cloud Type: medium
86%
0.0 In
06:00

SSW
SSW

 13 / 28 mph 55 / 51°F 87% 1010 mb
Low level cloud: 17%
Mid level cloud: 56%
High level cloud: 65%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

WSW
WSW

 20 / 43 mph 65 / 65°F 87% 1006 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 48%
Most Significant Cloud Type: low
22%
0.0 In
18:00

SW
SW

 18 / 38 mph 58 / 54°F 90% 1012 mb
Low level cloud: 35%
Mid level cloud: 53%
High level cloud: 99%
Most Significant Cloud Type: low
65%
0.1 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