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Fawley 14 Day Long Range Forecast

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

Hampshire, United Kingdom

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

Taking a look at Fawley over the coming two weeks and the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 22°C expected on the afternoon of Monday 20th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Monday 20th at 8°C. The next 14 days will have most days seeing a little rain. It looks like Saturday 18th 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		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		03:00

E
E

 3 / 6 kts 52 / 52°F 86%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 17%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 3 / 5 kts 56 / 55°F 87%
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 4 / 6 kts 60 / 57°F 83%
Low level cloud: 53%
Mid level cloud: 10%
High level cloud: 56%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 6 / 8 kts 61 / 59°F 76%
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 3 / 5 kts 59 / 59°F 76%
Low level cloud: 0%
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

SSW
SSW

 2 / 3 kts 61 / 59°F 82%
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 81%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 3 / 5 kts 56 / 56°F 88%
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NW
NW

 4 / 8 kts 54 / 53°F 90%
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 4 / 8 kts 54 / 53°F 93%
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 8 kts 56 / 54°F 94%
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 5 / 6 kts 59 / 58°F 87%
Low level cloud: 84%
Mid level cloud: 98%
High level cloud: 65%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 6 / 8 kts 61 / 61°F 85%
Low level cloud: 77%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 7 / 9 kts 66 / 65°F 78%
Low level cloud: 79%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 6 / 8 kts 66 / 64°F 85%
Low level cloud: 33%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 4 / 9 kts 56 / 56°F 94%
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: medium
39%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 7 / 12 kts 54 / 52°F 93%
Low level cloud: 14%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 7 / 12 kts 51 / 48°F 94%
Low level cloud: 21%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 7 / 12 kts 52 / 48°F 89%
Low level cloud: 2%
Mid level cloud: 22%
High level cloud: 84%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 9 / 10 kts 62 / 61°F 80%
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 8 / 9 kts 68 / 66°F 68%
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 8 / 10 kts 66 / 65°F 75%
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 9 / 12 kts 65 / 63°F 81%
Low level cloud: 8%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 13 kts 58 / 56°F 85%
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
Mon 20
May		00:00

NNE
NNE

 7 / 15 kts 49 / 45°F 87%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 7 / 14 kts 47 / 43°F 94%
Low level cloud: 72%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 10 / 16 kts 48 / 43°F 92%
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 13 / 15 kts 63 / 62°F 76%
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 10 / 12 kts 71 / 69°F 69%
Low level cloud: 40%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 5 / 6 kts 67 / 67°F 77%
Low level cloud: 87%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 3 / 4 kts 68 / 65°F 81%
Low level cloud: 23%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 12 kts 51 / 49°F 84%
Low level cloud: 6%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 6 / 11 kts 49 / 46°F 89%
Low level cloud: 30%
Mid level cloud: 29%
High level cloud: 3%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 5 / 9 kts 47 / 45°F 93%
Low level cloud: 50%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 8 kts 51 / 48°F 91%
Low level cloud: 64%
Mid level cloud: 26%
High level cloud: 24%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 4 / 4 kts 60 / 60°F 83%
Low level cloud: 83%
Mid level cloud: 23%
High level cloud: 35%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 1 / 1 kts 62 / 62°F 81%
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 2 / 3 kts 64 / 64°F 81%
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 2 / 2 kts 67 / 64°F 85%
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 1 / 1 kts 59 / 59°F 91%
Low level cloud: 8%
Mid level cloud: 48%
High level cloud: 98%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

WNW
WNW

 5 / 8 kts 55 / 53°F 93%
Low level cloud: 17%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 6 / 10 kts 53 / 51°F 93%
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 64%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 6 / 10 kts 54 / 51°F 94%
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 92%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 8 / 11 kts 57 / 54°F 88%
Low level cloud: 19%
Mid level cloud: 63%
High level cloud: 79%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 10 / 14 kts 62 / 61°F 79%
Low level cloud: 64%
Mid level cloud: 21%
High level cloud: 14%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 12 / 17 kts 62 / 61°F 81%
Low level cloud: 29%
Mid level cloud: 13%
High level cloud: 15%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 8 / 12 kts 61 / 60°F 86%
Low level cloud: 11%
Mid level cloud: 10%
High level cloud: 34%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 6 / 10 kts 55 / 53°F 93%
Low level cloud: 8%
Mid level cloud: 17%
High level cloud: 20%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

W
W

 4 / 6 kts 52 / 51°F 91%
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 15%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 3 / 5 kts 50 / 49°F 89%
Low level cloud: 34%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 4 / 6 kts 53 / 49°F 90%
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 3 / 3 kts 59 / 57°F 82%
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 44%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 6 / 7 kts 62 / 60°F 73%
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 6 / 8 kts 62 / 60°F 74%
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 4 / 6 kts 62 / 59°F 83%
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 99%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 2 / 3 kts 55 / 55°F 89%
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
48%
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

W
W

 8 / 18 kts 52 / 48°F 98%
Low level cloud: 90%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: low
99%
0.0 In
06:00

ENE
ENE

 1 / 2 kts 55 / 55°F 98%
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 9 / 20 kts 59 / 59°F 89%
Low level cloud: 92%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 9 / 20 kts 59 / 59°F 87%
Low level cloud: 58%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
Sat 25
May		00:00

NNE
NNE

 16 / 33 kts 58 / 54°F 91%
Low level cloud: 100%
Mid level cloud: 10%
High level cloud: 43%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 4 / 8 kts 59 / 59°F 89%
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

ENE
ENE

 13 / 27 kts 62 / 62°F 77%
Low level cloud: 74%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
18:00

W
W

 8 / 18 kts 63 / 63°F 83%
Low level cloud: 38%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
50%
0.0 In
Sun 26
May		00:00

ENE
ENE

 10 / 21 kts 57 / 55°F 93%
Low level cloud: 49%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
06:00

WSW
WSW

 6 / 14 kts 57 / 55°F 98%
Low level cloud: 75%
Mid level cloud: 92%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

 13 / 29 kts 62 / 62°F 94%
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 7 / 16 kts 63 / 63°F 89%
Low level cloud: 65%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: low
74%
0.1 In
Mon 27
May		00:00

NNW
NNW

 6 / 14 kts 54 / 51°F 89%
Low level cloud: 34%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
53%
0.0 In
06:00

N
N

 4 / 10 kts 57 / 57°F 85%
Low level cloud: 82%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: low
85%
0.0 In
12:00

NE
NE

 11 / 24 kts 64 / 64°F 69%
Low level cloud: 43%
Mid level cloud: 13%
High level cloud: 66%
Most Significant Cloud Type: low
55%
0.0 In
18:00

SW
SW

 7 / 16 kts 64 / 64°F 84%
Low level cloud: 52%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: low
61%
0.0 In
Tue 28
May		00:00

NNE
NNE

 7 / 16 kts 55 / 53°F 89%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 2%
Most Significant Cloud Type: medium
20%
0.2 In
06:00

S
S

 3 / 7 kts 61 / 61°F 95%
Low level cloud: 84%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
12:00

NNE
NNE

 6 / 12 kts 67 / 67°F 59%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

WNW
WNW

 9 / 20 kts 53 / 49°F 96%
Low level cloud: 80%
Mid level cloud: 86%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
Wed 29
May		00:00

ENE
ENE

 6 / 13 kts 59 / 59°F 91%
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
06:00

NW
NW

 8 / 18 kts 49 / 45°F 88%
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

E
E

 5 / 10 kts 66 / 66°F 68%
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

 10 / 21 kts 55 / 52°F 79%
Low level cloud: 1%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Thu 30
May		00:00

NE
NE

 6 / 13 kts 60 / 60°F 91%
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
06:00

NW
NW

 5 / 11 kts 51 / 49°F 86%
Low level cloud: 4%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
0.0 In
12:00

ENE
ENE

 9 / 20 kts 69 / 69°F 70%
Low level cloud: 11%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
18:00

WSW
WSW

 9 / 19 kts 59 / 56°F 75%
Low level cloud: 24%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
25%
0.0 In
Fri 31
May		00:00

NNE
NNE

 11 / 24 kts 57 / 54°F 91%
Low level cloud: 15%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
06:00

SSW
SSW

 11 / 24 kts 51 / 47°F 85%
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: low
68%
0.0 In
12:00

NE
NE

 13 / 29 kts 68 / 68°F 62%
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
18:00

SW
SW

 13 / 27 kts 56 / 52°F 98%
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

N
N

 11 / 24 kts 55 / 51°F 77%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 33%
Most Significant Cloud Type: medium
32%
0.0 In
06:00

W
W

 4 / 9 kts 55 / 54°F 88%
Low level cloud: 73%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
72%
0.1 In
12:00

N
N

 17 / 35 kts 62 / 62°F 70%
Low level cloud: 20%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
36%
0.0 In
18:00

SW
SW

 12 / 27 kts 59 / 59°F 77%
Low level cloud: 1%
Mid level cloud: 27%
High level cloud: 8%
Most Significant Cloud Type: medium
29%
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