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Upper Astrop 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Upper Astrop

Northamptonshire, United Kingdom

Long range weather outlook for Upper Astrop includes 14 day forecast summary:

For Upper Astrop in the coming two weeks the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 18°C expected on the afternoon of Friday 17th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Friday 24th at 6°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The current forecast indicates Friday 17th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May		15:00

SSE
SSE

 15 / 19 mph 62 / 61°F 85% 1000 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 13 / 15 mph 61 / 59°F 88% 1000 mb
Low level cloud: 43%
Mid level cloud: 24%
High level cloud: 39%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 13 / 15 mph 57 / 54°F 95% 1002 mb
Low level cloud: 92%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May		00:00

ESE
ESE

 9 / 14 mph 53 / 49°F 98% 1002 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 9 / 13 mph 52 / 49°F 98% 1003 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 9 / 13 mph 54 / 51°F 96% 1004 mb
Low level cloud: 96%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 9 / 11 mph 58 / 56°F 82% 1005 mb
Low level cloud: 75%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 9 / 11 mph 61 / 61°F 72% 1005 mb
Low level cloud: 89%
Mid level cloud: 4%
High level cloud: 57%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 6 / 8 mph 65 / 62°F 69% 1005 mb
Low level cloud: 22%
Mid level cloud: 22%
High level cloud: 33%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 7 / 9 mph 64 / 62°F 81% 1005 mb
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 3 / 6 mph 54 / 54°F 87% 1006 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

ESE
ESE

 3 / 6 mph 50 / 49°F 88% 1007 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 3 / 7 mph 47 / 46°F 90% 1007 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 96%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 3 / 4 mph 53 / 51°F 89% 1007 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 5 / 6 mph 58 / 58°F 81% 1007 mb
Low level cloud: 21%
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
12:00

NE
NE

 4 / 5 mph 61 / 60°F 80% 1007 mb
Low level cloud: 53%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 2 / 3 mph 57 / 57°F 94% 1006 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 84%
Most Significant Cloud Type: low
90%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 8 / 13 mph 54 / 51°F 97% 1006 mb
Low level cloud: 97%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

 4 / 7 mph 54 / 53°F 98% 1006 mb
Low level cloud: 89%
Mid level cloud: 69%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

N
N

 7 / 10 mph 52 / 50°F 99% 1006 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 8 / 12 mph 53 / 50°F 99% 1005 mb
Low level cloud: 100%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

ENE
ENE

 6 / 9 mph 53 / 51°F 99% 1006 mb
Low level cloud: 100%
Mid level cloud: 68%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

S
S

 6 / 8 mph 54 / 53°F 98% 1008 mb
Low level cloud: 95%
Mid level cloud: 96%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 7 / 9 mph 60 / 60°F 83% 1009 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 2 / 3 mph 65 / 62°F 77% 1010 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 20%
Most Significant Cloud Type: low
29%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

 5 / 8 mph 64 / 61°F 90% 1011 mb
Low level cloud: 20%
Mid level cloud: 23%
High level cloud: 98%
Most Significant Cloud Type: low
40%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

 7 / 14 mph 53 / 51°F 96% 1013 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 74%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NE
NE

 7 / 12 mph 51 / 48°F 98% 1013 mb
Low level cloud: 80%
Mid level cloud: 47%
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

NNE
NNE

 6 / 9 mph 50 / 48°F 98% 1014 mb
Low level cloud: 89%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 8 mph 51 / 49°F 98% 1014 mb
Low level cloud: 83%
Mid level cloud: 62%
High level cloud: 84%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 6 / 8 mph 54 / 53°F 94% 1015 mb
Low level cloud: 90%
Mid level cloud: 44%
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

NE
NE

 7 / 8 mph 58 / 57°F 87% 1015 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 6 / 7 mph 63 / 61°F 84% 1014 mb
Low level cloud: 49%
Mid level cloud: 44%
High level cloud: 87%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 7 / 9 mph 63 / 61°F 92% 1014 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 30%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 8 / 14 mph 54 / 52°F 95% 1015 mb
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: medium
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 7 / 15 mph 48 / 45°F 96% 1015 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 77%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 8 / 16 mph 46 / 42°F 96% 1015 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 39%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 8 / 13 mph 49 / 45°F 96% 1015 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 51%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 13 mph 60 / 56°F 82% 1015 mb
Low level cloud: 34%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 13 mph 64 / 63°F 69% 1014 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 11 / 16 mph 64 / 62°F 80% 1013 mb
Low level cloud: 52%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

 11 / 18 mph 60 / 56°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

 8 / 15 mph 52 / 48°F 95% 1014 mb
Low level cloud: 6%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 8 / 16 mph 47 / 44°F 97% 1014 mb
Low level cloud: 35%
Mid level cloud: 15%
High level cloud: 5%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 8 / 16 mph 47 / 44°F 96% 1014 mb
Low level cloud: 35%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 12 / 18 mph 51 / 46°F 95% 1014 mb
Low level cloud: 44%
Mid level cloud: 93%
High level cloud: 13%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 15 mph 55 / 50°F 91% 1014 mb
Low level cloud: 46%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 10 / 14 mph 55 / 52°F 86% 1013 mb
Low level cloud: 25%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 14 / 17 mph 63 / 62°F 73% 1012 mb
Low level cloud: 47%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 13 / 19 mph 59 / 55°F 81% 1012 mb
Low level cloud: 4%
Mid level cloud: 40%
High level cloud: 3%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 7 / 13 mph 50 / 47°F 95% 1012 mb
Low level cloud: 67%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May		00:00

S
S

 5 / 11 mph 50 / 48°F 98% 1014 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

 5 / 10 mph 51 / 50°F 92% 1024 mb
Low level cloud: 74%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
12:00

ESE
ESE

 9 / 19 mph 51 / 47°F 98% 1013 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.3 In
Wed 22
May		00:00

W
W

 9 / 19 mph 50 / 46°F 96% 1009 mb
Low level cloud: 32%
Mid level cloud: 58%
High level cloud: 86%
Most Significant Cloud Type: low
62%
0.0 In
06:00

NE
NE

 5 / 11 mph 49 / 47°F 92% 1013 mb
Low level cloud: 76%
Mid level cloud: 49%
High level cloud: 7%
Most Significant Cloud Type: low
94%
0.0 In
12:00

N
N

 7 / 15 mph 56 / 55°F 99% 1011 mb
Low level cloud: 100%
Mid level cloud: 73%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

 10 / 21 mph 55 / 52°F 88% 1013 mb
Low level cloud: 94%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
Thu 23
May		00:00

SSW
SSW

 2 / 5 mph 56 / 57°F 99% 1010 mb
Low level cloud: 89%
Mid level cloud: 27%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

 9 / 19 mph 44 / 39°F 88% 1016 mb
Low level cloud: 91%
Mid level cloud: 76%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 7 / 14 mph 63 / 64°F 84% 1012 mb
Low level cloud: 80%
Mid level cloud: 90%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

 9 / 18 mph 54 / 51°F 82% 1016 mb
Low level cloud: 58%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
74%
0.0 In
Fri 24
May		00:00

SSW
SSW

 5 / 11 mph 54 / 53°F 96% 1014 mb
Low level cloud: 39%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: low
52%
0.2 In
06:00

NNW
NNW

 6 / 13 mph 48 / 45°F 95% 1019 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 9 / 18 mph 61 / 62°F 81% 1017 mb
Low level cloud: 93%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
98%
0.0 In
18:00

NE
NE

 8 / 17 mph 51 / 48°F 90% 1023 mb
Low level cloud: 44%
Mid level cloud: 95%
High level cloud: 66%
Most Significant Cloud Type: low
84%
0.0 In
Sat 25
May		00:00

SW
SW

 5 / 11 mph 54 / 53°F 94% 1020 mb
Low level cloud: 3%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
28%
0.1 In
06:00

E
E

 7 / 15 mph 43 / 39°F 92% 1025 mb
Low level cloud: 23%
Mid level cloud: 29%
High level cloud: 40%
Most Significant Cloud Type: low
38%
0.0 In
12:00

NNW
NNW

 3 / 7 mph 68 / 68°F 69% 1022 mb
Low level cloud: 58%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
18:00

ESE
ESE

 7 / 14 mph 52 / 49°F 93% 1021 mb
Low level cloud: 83%
Mid level cloud: 89%
High level cloud: 63%
Most Significant Cloud Type: low
100%
0.0 In
Sun 26
May		00:00

NW
NW

 2 / 4 mph 59 / 60°F 89% 1023 mb
Low level cloud: 32%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

ESE
ESE

 9 / 19 mph 47 / 43°F 97% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 4 / 8 mph 70 / 70°F 74% 1023 mb
Low level cloud: 39%
Mid level cloud: 6%
High level cloud: 47%
Most Significant Cloud Type: low
46%
0.1 In
18:00

SE
SE

 8 / 16 mph 56 / 55°F 95% 1015 mb
Low level cloud: 92%
Mid level cloud: 82%
High level cloud: 52%
Most Significant Cloud Type: low
100%
0.1 In
Mon 27
May		00:00

SSW
SSW

 4 / 7 mph 60 / 60°F 90% 1022 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
37%
0.1 In
06:00

SSW
SSW

 6 / 13 mph 55 / 54°F 98% 1013 mb
Low level cloud: 94%
Mid level cloud: 18%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SSW
SSW

 6 / 13 mph 70 / 70°F 73% 1022 mb
Low level cloud: 29%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: low
34%
0.0 In
18:00

SSE
SSE

 11 / 22 mph 54 / 51°F 98% 1011 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.3 In
Tue 28
May		00:00

NE
NE

 6 / 14 mph 55 / 54°F 98% 1023 mb
Low level cloud: 54%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
81%
0.0 In
06:00

SSE
SSE

 7 / 15 mph 57 / 55°F 97% 1008 mb
Low level cloud: 33%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
12:00

ENE
ENE

 10 / 21 mph 63 / 63°F 81% 1022 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 9 / 19 mph 68 / 68°F 87% 1004 mb
Low level cloud: 15%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
22%
0.0 In
Wed 29
May		00:00

ENE
ENE

 11 / 23 mph 51 / 47°F 89% 1022 mb
Low level cloud: 94%
Mid level cloud: 24%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ESE
ESE

 1 / 2 mph 61 / 61°F 87% 1001 mb
Low level cloud: 60%
Mid level cloud: 41%
High level cloud: 36%
Most Significant Cloud Type: low
78%
0.0 In
12:00

E
E

 11 / 23 mph 58 / 55°F 77% 1020 mb
Low level cloud: 97%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 11 / 23 mph 54 / 51°F 97% 999 mb
Low level cloud: 73%
Mid level cloud: 56%
High level cloud: 34%
Most Significant Cloud Type: low
96%
0.2 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