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Forston 14 Day Long Range Forecast

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

Dorset, United Kingdom

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

Taking a look at Forston over the coming two weeks and 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 Monday 20th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Monday 20th at 8°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 18th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

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

ESE
ESE

 5 / 8 kts 54 / 52°F 83%
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 26%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 5 / 9 kts 55 / 51°F 88%
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 5 / 9 kts 56 / 52°F 88%
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 54%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 7 / 11 kts 57 / 53°F 84%
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 4 / 7 kts 57 / 55°F 82%
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 1 / 2 kts 57 / 58°F 84%
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 2 / 5 kts 55 / 56°F 85%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNW
NNW

 4 / 6 kts 56 / 56°F 88%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 99%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 5 / 9 kts 55 / 54°F 88%
Low level cloud: 3%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: medium
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 6 / 11 kts 54 / 52°F 90%
Low level cloud: 15%
Mid level cloud: 89%
High level cloud: 51%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 6 / 9 kts 57 / 55°F 92%
Low level cloud: 91%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 2 / 3 kts 60 / 60°F 89%
Low level cloud: 80%
Mid level cloud: 60%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 3 / 4 kts 63 / 61°F 86%
Low level cloud: 63%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 3 / 5 kts 64 / 61°F 90%
Low level cloud: 29%
Mid level cloud: 17%
High level cloud: 22%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 5 / 9 kts 59 / 58°F 92%
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 7 / 14 kts 55 / 52°F 94%
Low level cloud: 30%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 18 kts 52 / 48°F 93%
Low level cloud: 11%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 10 / 18 kts 52 / 47°F 90%
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 9 / 11 kts 59 / 56°F 82%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 6 / 8 kts 64 / 62°F 76%
Low level cloud: 9%
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
15:00

ENE
ENE

 0 / 1 kts 65 / 62°F 77%
Low level cloud: 25%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 5 / 9 kts 65 / 62°F 81%
Low level cloud: 38%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 9 / 19 kts 56 / 54°F 87%
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
Mon 20
May		00:00

NE
NE

 11 / 24 kts 50 / 46°F 88%
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
03:00

NE
NE

 11 / 24 kts 47 / 42°F 88%
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 13 / 25 kts 48 / 42°F 91%
Low level cloud: 27%
Mid level cloud: 18%
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

NE
NE

 13 / 15 kts 60 / 59°F 83%
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 6 / 7 kts 69 / 67°F 76%
Low level cloud: 58%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 1 / 2 kts 66 / 65°F 81%
Low level cloud: 85%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 6 kts 69 / 66°F 81%
Low level cloud: 40%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 6 / 7 kts 60 / 60°F 87%
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NE
NE

 6 / 12 kts 52 / 49°F 86%
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
03:00

NNE
NNE

 7 / 14 kts 49 / 45°F 84%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 11 kts 49 / 45°F 86%
Low level cloud: 3%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 4 / 5 kts 60 / 58°F 84%
Low level cloud: 50%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 2 / 2 kts 61 / 60°F 82%
Low level cloud: 89%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 4 / 5 kts 66 / 63°F 79%
Low level cloud: 62%
Mid level cloud: 24%
High level cloud: 19%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 7 / 9 kts 64 / 62°F 82%
Low level cloud: 21%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 10 kts 59 / 56°F 89%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

NW
NW

 7 / 12 kts 55 / 52°F 87%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 9 / 15 kts 53 / 50°F 90%
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 84%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 8 / 15 kts 53 / 49°F 92%
Low level cloud: 19%
Mid level cloud: 32%
High level cloud: 14%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 9 / 15 kts 56 / 51°F 90%
Low level cloud: 16%
Mid level cloud: 42%
High level cloud: 7%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 10 / 16 kts 58 / 55°F 82%
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 13 / 21 kts 60 / 56°F 84%
Low level cloud: 19%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 13 / 21 kts 58 / 54°F 85%
Low level cloud: 15%
Mid level cloud: 15%
High level cloud: 6%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 9 / 13 kts 57 / 53°F 88%
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

WNW
WNW

 8 / 13 kts 52 / 49°F 89%
Low level cloud: 29%
Mid level cloud: 64%
High level cloud: 25%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 9 / 13 kts 51 / 47°F 90%
Low level cloud: 48%
Mid level cloud: 29%
High level cloud: 22%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 5 / 9 kts 51 / 48°F 86%
Low level cloud: 59%
Mid level cloud: 58%
High level cloud: 77%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 2 / 4 kts 53 / 52°F 82%
Low level cloud: 61%
Mid level cloud: 96%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 4 / 5 kts 57 / 54°F 80%
Low level cloud: 48%
Mid level cloud: 27%
High level cloud: 12%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 6 / 8 kts 58 / 55°F 76%
Low level cloud: 8%
Mid level cloud: 15%
High level cloud: 6%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 5 / 9 kts 57 / 54°F 79%
Low level cloud: 3%
Mid level cloud: 20%
High level cloud: 7%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 6 / 11 kts 55 / 52°F 86%
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: medium
34%
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

 10 / 21 kts 51 / 46°F 97%
Low level cloud: 97%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

 4 / 9 kts 54 / 52°F 98%
Low level cloud: 97%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

 10 / 21 kts 58 / 56°F 86%
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 59%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

E
E

 13 / 29 kts 57 / 54°F 92%
Low level cloud: 77%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
86%
0.0 In
Sat 25
May		00:00

N
N

 13 / 28 kts 57 / 54°F 94%
Low level cloud: 50%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: low
59%
0.0 In
06:00

NW
NW

 5 / 11 kts 53 / 51°F 79%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

ENE
ENE

 9 / 20 kts 60 / 60°F 89%
Low level cloud: 91%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

 10 / 21 kts 59 / 56°F 92%
Low level cloud: 78%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
Sun 26
May		00:00

ENE
ENE

 13 / 29 kts 54 / 50°F 94%
Low level cloud: 87%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.1 In
06:00

WSW
WSW

 7 / 16 kts 56 / 53°F 98%
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 69%
Most Significant Cloud Type: low
100%
0.1 In
12:00

E
E

 13 / 29 kts 59 / 56°F 96%
Low level cloud: 90%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 7 / 14 kts 60 / 60°F 94%
Low level cloud: 88%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Mon 27
May		00:00

NNE
NNE

 4 / 9 kts 53 / 52°F 86%
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
59%
0.0 In
06:00

NNW
NNW

 6 / 12 kts 55 / 53°F 88%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 82%
Most Significant Cloud Type: medium
17%
0.0 In
12:00

NE
NE

 8 / 18 kts 60 / 60°F 86%
Low level cloud: 34%
Mid level cloud: 51%
High level cloud: 9%
Most Significant Cloud Type: low
53%
0.1 In
18:00

WSW
WSW

 6 / 13 kts 62 / 62°F 90%
Low level cloud: 67%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
Tue 28
May		00:00

NE
NE

 10 / 20 kts 54 / 50°F 89%
Low level cloud: 47%
Mid level cloud: 30%
High level cloud: 9%
Most Significant Cloud Type: low
58%
0.2 In
06:00

SSW
SSW

 7 / 16 kts 53 / 49°F 95%
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
99%
0.0 In
12:00

NE
NE

 2 / 5 kts 62 / 62°F 70%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
18:00

NW
NW

 17 / 35 kts 60 / 60°F 86%
Low level cloud: 41%
Mid level cloud: 45%
High level cloud: 93%
Most Significant Cloud Type: low
68%
0.2 In
Wed 29
May		00:00

NE
NE

 8 / 18 kts 54 / 51°F 89%
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

 12 / 26 kts 49 / 43°F 81%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ESE
ESE

 6 / 12 kts 61 / 61°F 77%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 34%
Most Significant Cloud Type: high
33%
0.0 In
18:00

NW
NW

 13 / 29 kts 55 / 51°F 75%
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
26%
0.0 In
Thu 30
May		00:00

NE
NE

 7 / 15 kts 55 / 53°F 87%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: high
41%
0.0 In
06:00

NW
NW

 8 / 17 kts 50 / 46°F 82%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

E
E

 7 / 16 kts 64 / 64°F 78%
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
18:00

WSW
WSW

 11 / 24 kts 56 / 53°F 83%
Low level cloud: 26%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: low
28%
0.0 In
Fri 31
May		00:00

NE
NE

 12 / 26 kts 58 / 56°F 94%
Low level cloud: 29%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
06:00

SSW
SSW

 15 / 32 kts 54 / 49°F 91%
Low level cloud: 91%
Mid level cloud: 84%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

 14 / 30 kts 66 / 66°F 73%
Low level cloud: 16%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
18:00

SW
SW

 11 / 24 kts 58 / 55°F 98%
Low level cloud: 87%
Mid level cloud: 94%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

NNE
NNE

 11 / 24 kts 55 / 51°F 86%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 10%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

W
W

 7 / 16 kts 53 / 50°F 87%
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
12:00

N
N

 16 / 34 kts 60 / 60°F 69%
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
0.0 In
18:00

SW
SW

 15 / 33 kts 59 / 55°F 79%
Low level cloud: 1%
Mid level cloud: 53%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
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