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Sipson 14 Day Long Range Forecast

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

Hillingdon, United Kingdom

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

The next 14 day outlook for Sipson shows the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 23°C expected on the afternoon of Saturday 25th. The mean minimum temperature will be 12°C, dipping to its lowest on the morning of Monday 20th at 9°C. Expect the following 14 days ahead to have most days seeing a little rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		03:00

S
S

 2 / 4 kts 53 / 53°F 94%
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 0 / 1 kts 55 / 53°F 89%
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 2 / 2 kts 64 / 61°F 69%
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 1 / 2 kts 69 / 68°F 55%
Low level cloud: 84%
Mid level cloud: 17%
High level cloud: 8%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 3 / 4 kts 70 / 68°F 53%
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 2 / 3 kts 67 / 66°F 72%
Low level cloud: 61%
Mid level cloud: 52%
High level cloud: 73%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 3 / 5 kts 60 / 60°F 89%
Low level cloud: 3%
Mid level cloud: 50%
High level cloud: 34%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

N
N

 4 / 7 kts 57 / 56°F 95%
Low level cloud: 26%
Mid level cloud: 89%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 6 kts 55 / 54°F 96%
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 6 / 8 kts 55 / 52°F 91%
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 5 / 7 kts 56 / 54°F 93%
Low level cloud: 65%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 6 / 7 kts 62 / 61°F 80%
Low level cloud: 99%
Mid level cloud: 27%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 6 / 7 kts 65 / 64°F 76%
Low level cloud: 83%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 9 kts 66 / 64°F 87%
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 6 / 8 kts 57 / 55°F 94%
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 5 / 7 kts 53 / 51°F 96%
Low level cloud: 42%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 7 kts 51 / 49°F 96%
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 5 / 7 kts 53 / 49°F 90%
Low level cloud: 20%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 8 / 9 kts 63 / 62°F 66%
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 10 / 12 kts 68 / 66°F 58%
Low level cloud: 51%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 11 / 13 kts 68 / 66°F 58%
Low level cloud: 67%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 9 / 11 kts 67 / 66°F 65%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 8 / 9 kts 58 / 56°F 76%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 7 / 9 kts 51 / 48°F 90%
Low level cloud: 45%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 7 / 9 kts 50 / 47°F 89%
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 8 / 11 kts 51 / 46°F 84%
Low level cloud: 23%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 10 / 11 kts 59 / 56°F 66%
Low level cloud: 14%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 10 / 12 kts 65 / 64°F 55%
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 10 / 12 kts 66 / 64°F 55%
Low level cloud: 9%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 8 / 9 kts 61 / 60°F 67%
Low level cloud: 47%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 8 kts 53 / 51°F 81%
Low level cloud: 66%
Mid level cloud: 78%
High level cloud: 3%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

N
N

 5 / 6 kts 52 / 50°F 86%
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 3 / 5 kts 51 / 50°F 89%
Low level cloud: 92%
Mid level cloud: 29%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 3 / 4 kts 53 / 52°F 88%
Low level cloud: 92%
Mid level cloud: 25%
High level cloud: 30%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 2 / 3 kts 56 / 56°F 82%
Low level cloud: 94%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 1 / 2 kts 63 / 61°F 68%
Low level cloud: 75%
Mid level cloud: 25%
High level cloud: 12%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 4 / 5 kts 62 / 62°F 67%
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 4 / 5 kts 62 / 62°F 74%
Low level cloud: 23%
Mid level cloud: 73%
High level cloud: 14%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 2 / 3 kts 59 / 59°F 84%
Low level cloud: 33%
Mid level cloud: 39%
High level cloud: 32%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

NW
NW

 3 / 5 kts 57 / 57°F 88%
Low level cloud: 45%
Mid level cloud: 31%
High level cloud: 17%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 3 / 5 kts 56 / 55°F 88%
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 4 / 6 kts 55 / 54°F 88%
Low level cloud: 65%
Mid level cloud: 100%
High level cloud: 53%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 6 / 7 kts 56 / 55°F 82%
Low level cloud: 10%
Mid level cloud: 75%
High level cloud: 47%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 9 / 11 kts 62 / 62°F 76%
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 7 / 10 kts 65 / 62°F 76%
Low level cloud: 40%
Mid level cloud: 33%
High level cloud: 32%
Most Significant Cloud Type: low
55%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 6 / 8 kts 64 / 62°F 84%
Low level cloud: 13%
Mid level cloud: 30%
High level cloud: 8%
Most Significant Cloud Type: low
24%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 5 / 8 kts 56 / 55°F 95%
Low level cloud: 12%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

W
W

 4 / 6 kts 53 / 52°F 96%
Low level cloud: 19%
Mid level cloud: 8%
High level cloud: 30%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 3 / 5 kts 50 / 49°F 95%
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 2 / 3 kts 54 / 52°F 89%
Low level cloud: 18%
Mid level cloud: 46%
High level cloud: 31%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 2 / 2 kts 63 / 62°F 69%
Low level cloud: 60%
Mid level cloud: 45%
High level cloud: 46%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 2 / 3 kts 64 / 63°F 70%
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
99%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

 1 / 2 kts 62 / 62°F 81%
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 4 / 6 kts 62 / 59°F 92%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 86%
Most Significant Cloud Type: medium
49%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NW
NW

 3 / 5 kts 57 / 57°F 93%
Low level cloud: 1%
Mid level cloud: 24%
High level cloud: 17%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		00:00

WNW
WNW

 6 / 14 kts 57 / 56°F 98%
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

 2 / 4 kts 53 / 53°F 93%
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 8 / 18 kts 61 / 61°F 74%
Low level cloud: 98%
Mid level cloud: 62%
High level cloud: 68%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 6 / 13 kts 69 / 69°F 67%
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
6%
0.0 In
Sat 25
May		00:00

NE
NE

 11 / 24 kts 57 / 53°F 91%
Low level cloud: 74%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
06:00

NW
NW

 2 / 5 kts 65 / 65°F 85%
Low level cloud: 14%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
12:00

ENE
ENE

 13 / 29 kts 69 / 69°F 56%
Low level cloud: 59%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: low
66%
0.0 In
18:00

WNW
WNW

 7 / 15 kts 70 / 70°F 65%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 97%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 26
May		00:00

ENE
ENE

 6 / 13 kts 60 / 60°F 89%
Low level cloud: 24%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
06:00

WSW
WSW

 4 / 9 kts 60 / 60°F 94%
Low level cloud: 76%
Mid level cloud: 94%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

 9 / 20 kts 65 / 65°F 70%
Low level cloud: 97%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NW
NW

 5 / 10 kts 67 / 67°F 90%
Low level cloud: 65%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
80%
0.1 In
Mon 27
May		00:00

NNE
NNE

 4 / 10 kts 61 / 61°F 95%
Low level cloud: 36%
Mid level cloud: 25%
High level cloud: 47%
Most Significant Cloud Type: low
50%
0.1 In
06:00

NNW
NNW

 3 / 6 kts 58 / 58°F 79%
Low level cloud: 68%
Mid level cloud: 10%
High level cloud: 20%
Most Significant Cloud Type: low
74%
0.0 In
12:00

NE
NE

 10 / 22 kts 69 / 69°F 60%
Low level cloud: 80%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 4 / 9 kts 73 / 77°F 63%
Low level cloud: 43%
Mid level cloud: 19%
High level cloud: 15%
Most Significant Cloud Type: low
51%
0.0 In
Tue 28
May		00:00

NNE
NNE

 6 / 12 kts 60 / 60°F 77%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
0.1 In
06:00

SW
SW

 4 / 9 kts 62 / 62°F 87%
Low level cloud: 66%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
12:00

NNE
NNE

 6 / 13 kts 72 / 76°F 47%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 74%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

NW
NW

 8 / 18 kts 54 / 51°F 94%
Low level cloud: 76%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Wed 29
May		00:00

NNE
NNE

 4 / 9 kts 62 / 62°F 88%
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: low
15%
0.0 In
06:00

WNW
WNW

 7 / 15 kts 52 / 49°F 84%
Low level cloud: 9%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
12:00

NE
NE

 5 / 11 kts 74 / 76°F 43%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

WNW
WNW

 7 / 14 kts 59 / 59°F 72%
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
Thu 30
May		00:00

NE
NE

 5 / 10 kts 61 / 61°F 94%
Low level cloud: 51%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
06:00

WNW
WNW

 4 / 10 kts 56 / 55°F 79%
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

NE
NE

 9 / 20 kts 73 / 76°F 51%
Low level cloud: 46%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
18:00

W
W

 3 / 6 kts 68 / 68°F 59%
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
10%
0.0 In
Fri 31
May		00:00

NNE
NNE

 8 / 17 kts 61 / 61°F 84%
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
06:00

SSW
SSW

 7 / 15 kts 50 / 47°F 84%
Low level cloud: 15%
Mid level cloud: 22%
High level cloud: 26%
Most Significant Cloud Type: low
25%
0.0 In
12:00

NE
NE

 12 / 26 kts 70 / 70°F 48%
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
18:00

SSW
SSW

 9 / 19 kts 54 / 51°F 98%
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

N
N

 10 / 21 kts 56 / 54°F 74%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

W
W

 4 / 8 kts 62 / 62°F 91%
Low level cloud: 18%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.1 In
12:00

NNE
NNE

 14 / 30 kts 66 / 66°F 60%
Low level cloud: 63%
Mid level cloud: 35%
High level cloud: 7%
Most Significant Cloud Type: low
75%
0.0 In
18:00

SSW
SSW

 10 / 22 kts 62 / 62°F 64%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
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