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Roanne 14 Day Long Range Forecast

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

France

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

Taking a look at Roanne over the coming two weeks and the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 15°C expected on the afternoon of Friday 19th. The mean minimum temperature will be 3°C, dipping to its lowest on the morning of Sunday 21st at 0°C. The next 14 days will have mixed weather with some days dry and some seeing a little rain. Current predictions suggest Tuesday 16th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 12
Dec		19:00

SSE
SSE

 2 / 5 mph 45 / 45°F 90% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 6 mph 43 / 41°F 90% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 13
Dec		01:00

SSW
SSW

 2 / 5 mph 41 / 40°F 90% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 34%
Most Significant Cloud Type: high
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 1 / 2 mph 40 / 40°F 91% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 73%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 1 / 2 mph 39 / 39°F 91% 1028 mb
Low level cloud: 3%
Mid level cloud: 2%
High level cloud: 92%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 1 / 2 mph 45 / 45°F 86% 1029 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 3 / 4 mph 54 / 53°F 78% 1028 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 2 / 2 mph 51 / 50°F 87% 1027 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 5 mph 41 / 40°F 94% 1028 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 2 / 4 mph 40 / 40°F 93% 1028 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Dec		01:00

SSW
SSW

 2 / 3 mph 38 / 38°F 94% 1028 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 4 / 7 mph 37 / 34°F 94% 1027 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 4 / 7 mph 36 / 34°F 94% 1027 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 7 mph 41 / 38°F 89% 1027 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 6 / 7 mph 52 / 50°F 73% 1025 mb
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
16:00

SSE
SSE

 5 / 7 mph 50 / 48°F 82% 1023 mb
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
19:00

SSE
SSE

 5 / 11 mph 42 / 39°F 89% 1023 mb
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
22:00

S
S

 5 / 11 mph 39 / 35°F 86% 1022 mb
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 15
Dec		01:00

SSE
SSE

 6 / 13 mph 38 / 33°F 83% 1021 mb
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
04:00

SSE
SSE

 7 / 14 mph 37 / 31°F 91% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 27%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 7 / 14 mph 37 / 32°F 93% 1020 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 17%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 7 / 15 mph 45 / 41°F 83% 1019 mb
Low level cloud: 47%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 10 / 11 mph 58 / 55°F 70% 1016 mb
Low level cloud: 27%
Mid level cloud: 71%
High level cloud: 22%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 8 / 14 mph 52 / 49°F 74% 1015 mb
Low level cloud: 31%
Mid level cloud: 49%
High level cloud: 96%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 9 / 18 mph 45 / 40°F 86% 1016 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 34%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 12 / 22 mph 48 / 43°F 86% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
47%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 16
Dec		01:00

SSE
SSE

 12 / 24 mph 46 / 40°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 75%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 14 / 30 mph 44 / 37°F 85% 1015 mb
Low level cloud: 8%
Mid level cloud: 67%
High level cloud: 98%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 12 / 25 mph 44 / 38°F 86% 1015 mb
Low level cloud: 12%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SSE
SSE

 6 / 9 mph 47 / 44°F 94% 1017 mb
Low level cloud: 34%
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
13:00

SSE
SSE

 4 / 5 mph 50 / 49°F 94% 1017 mb
Low level cloud: 73%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 6 / 7 mph 51 / 48°F 93% 1017 mb
Low level cloud: 36%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 6 mph 49 / 47°F 95% 1019 mb
Low level cloud: 37%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 5 / 8 mph 47 / 45°F 95% 1020 mb
Low level cloud: 26%
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
Wed 17
Dec		01:00

S
S

 4 / 7 mph 46 / 44°F 93% 1021 mb
Low level cloud: 44%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 3 / 6 mph 46 / 44°F 93% 1022 mb
Low level cloud: 42%
Mid level cloud: 71%
High level cloud: 42%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 3 / 6 mph 45 / 44°F 93% 1024 mb
Low level cloud: 42%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 3 / 5 mph 49 / 47°F 90% 1025 mb
Low level cloud: 12%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 4 / 5 mph 56 / 56°F 79% 1025 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 3 / 5 mph 52 / 51°F 86% 1025 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 10 mph 44 / 41°F 93% 1027 mb
Low level cloud: 10%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 4 / 8 mph 42 / 40°F 93% 1028 mb
Low level cloud: 3%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		01:00

S
S

 4 / 10 mph 41 / 38°F 92% 1028 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 4 / 8 mph 40 / 37°F 92% 1028 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 5 / 10 mph 39 / 35°F 92% 1028 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 5 / 9 mph 42 / 39°F 88% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 9 / 11 mph 53 / 50°F 76% 1026 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 7 / 11 mph 51 / 48°F 82% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 7 / 14 mph 43 / 38°F 92% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 7 / 15 mph 41 / 36°F 93% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 10%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 19
Dec		01:00

SSW
SSW

 12 / 21 mph 49 / 44°F 77% 1017 mb
Low level cloud: 18%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SSE
SSE

 6 / 13 mph 37 / 32°F 95% 1021 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: low
7%
0.0 In
13:00

S
S

 12 / 14 mph 55 / 51°F 70% 1018 mb
Low level cloud: 63%
Mid level cloud: 77%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
19:00

S
S

 8 / 13 mph 50 / 47°F 82% 1020 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
0.0 In
Sat 20
Dec		01:00

NW
NW

 2 / 3 mph 52 / 53°F 97% 1022 mb
Low level cloud: 79%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSE
SSE

 2 / 3 mph 48 / 49°F 95% 1023 mb
Low level cloud: 32%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
63%
0.0 In
13:00

WNW
WNW

 9 / 13 mph 46 / 42°F 76% 1029 mb
Low level cloud: 55%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
19:00

NW
NW

 4 / 5 mph 46 / 44°F 94% 1028 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
Sun 21
Dec		01:00

NW
NW

 3 / 5 mph 39 / 37°F 90% 1031 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
07:00

NNW
NNW

 2 / 3 mph 41 / 41°F 98% 1027 mb
Low level cloud: 90%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

N
N

 7 / 9 mph 47 / 44°F 78% 1034 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

NW
NW

 2 / 3 mph 46 / 46°F 94% 1027 mb
Low level cloud: 54%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
Mon 22
Dec		01:00

NW
NW

 5 / 9 mph 36 / 32°F 93% 1035 mb
Low level cloud: 6%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
9%
0.0 In
07:00

S
S

 3 / 6 mph 36 / 34°F 95% 1026 mb
Low level cloud: 24%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
13:00

NNW
NNW

 6 / 9 mph 49 / 46°F 80% 1031 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
19:00

SSE
SSE

 4 / 6 mph 42 / 40°F 94% 1023 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
Tue 23
Dec		01:00

NW
NW

 2 / 3 mph 37 / 36°F 95% 1030 mb
Low level cloud: 26%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
29%
0.0 In
07:00

S
S

 6 / 12 mph 37 / 32°F 88% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 13%
Most Significant Cloud Type: high
12%
0.0 In
13:00

N
N

 4 / 6 mph 48 / 47°F 75% 1029 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 28%
Most Significant Cloud Type: low
25%
0.0 In
19:00

SSE
SSE

 4 / 9 mph 43 / 40°F 86% 1024 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
5%
0.0 In
Wed 24
Dec		01:00

W
W

 1 / 1 mph 36 / 36°F 93% 1032 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
10%
0.0 In
07:00

S
S

 5 / 11 mph 36 / 32°F 90% 1028 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 11%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

SSE
SSE

 5 / 7 mph 48 / 46°F 67% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
19:00

SSE
SSE

 6 / 12 mph 42 / 38°F 85% 1024 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: medium
30%
0.0 In
Thu 25
Dec		01:00

SSE
SSE

 5 / 11 mph 33 / 28°F 84% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
07:00

SSE
SSE

 6 / 12 mph 40 / 37°F 90% 1022 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
0.0 In
13:00

SE
SE

 3 / 4 mph 54 / 55°F 47% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
19:00

E
E

 1 / 2 mph 43 / 43°F 89% 1024 mb
Low level cloud: 11%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: medium
74%
0.0 In
Fri 26
Dec		01:00

WSW
WSW

 2 / 3 mph 37 / 37°F 66% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NNW
NNW

 4 / 7 mph 38 / 35°F 95% 1027 mb
Low level cloud: 22%
Mid level cloud: 8%
High level cloud: 37%
Most Significant Cloud Type: low
29%
0.0 In
13:00

NNW
NNW

 4 / 5 mph 50 / 50°F 64% 1023 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

NNW
NNW

 4 / 5 mph 44 / 42°F 94% 1026 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
Sat 27
Dec		01:00

NNW
NNW

 4 / 6 mph 39 / 35°F 99% 1027 mb
Low level cloud: 97%
Mid level cloud: 28%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NW
NW

 2 / 3 mph 32 / 32°F 96% 1022 mb
Low level cloud: 39%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
13:00

N
N

 10 / 14 mph 40 / 34°F 75% 1030 mb
Low level cloud: 60%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
19:00

NNW
NNW

 3 / 4 mph 36 / 34°F 91% 1021 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In

Other Locations Near to Roanne

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