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Rouyn 14 Day Long Range Forecast

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

Quebec, Canada

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

Reviewing the forecast for Rouyn Over the next 14 days and the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 19°C expected on the afternoon of Friday 3rd. The mean minimum temperature will be 5°C, dipping to its lowest on the morning of Monday 29th at -2°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain, sleet or snow. The indicators are that Tuesday 7th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 28
Apr		02:00

SSW
SSW

 11 / 18 mph 52 / 48°F 97% 1007 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SW
SW

 11 / 17 mph 53 / 50°F 94% 1008 mb
Low level cloud: 100%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

 12 / 15 mph 40 / 33°F 92% 1014 mb
Low level cloud: 100%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNW
NNW

 11 / 13 mph 35 / 27°F 82% 1019 mb
Low level cloud: 100%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NNW
NNW

 11 / 13 mph 43 / 37°F 67% 1021 mb
Low level cloud: 74%
Mid level cloud: 12%
High level cloud: 10%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

N
N

 11 / 13 mph 43 / 37°F 64% 1022 mb
Low level cloud: 65%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NNE
NNE

 6 / 10 mph 40 / 34°F 65% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 83%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNE
NNE

 9 / 14 mph 34 / 26°F 66% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr		20:00

E
E

 9 / 15 mph 39 / 33°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

E
E

 11 / 17 mph 39 / 32°F 91% 1017 mb
Low level cloud: 79%
Mid level cloud: 100%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 30
Apr		02:00

ESE
ESE

 12 / 20 mph 39 / 32°F 91% 1016 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ESE
ESE

 11 / 22 mph 38 / 30°F 89% 1015 mb
Low level cloud: 99%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

 11 / 18 mph 40 / 33°F 90% 1015 mb
Low level cloud: 93%
Mid level cloud: 50%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SE
SE

 10 / 15 mph 44 / 38°F 88% 1014 mb
Low level cloud: 100%
Mid level cloud: 63%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SE
SE

 10 / 13 mph 46 / 42°F 90% 1013 mb
Low level cloud: 100%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSE
SSE

 7 / 11 mph 46 / 42°F 92% 1013 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

 4 / 8 mph 43 / 40°F 97% 1013 mb
Low level cloud: 99%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

 4 / 7 mph 41 / 39°F 99% 1013 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May		02:00

SSW
SSW

 2 / 4 mph 43 / 43°F 99% 1013 mb
Low level cloud: 100%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SE
SE

 2 / 4 mph 44 / 43°F 99% 1013 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

S
S

 2 / 4 mph 45 / 45°F 98% 1014 mb
Low level cloud: 100%
Mid level cloud: 49%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

S
S

 4 / 5 mph 51 / 49°F 87% 1013 mb
Low level cloud: 92%
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
14:00

SSW
SSW

 7 / 9 mph 59 / 57°F 64% 1011 mb
Low level cloud: 95%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSW
SSW

 4 / 6 mph 56 / 54°F 80% 1011 mb
Low level cloud: 25%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

 10 / 15 mph 52 / 48°F 83% 1011 mb
Low level cloud: 62%
Mid level cloud: 47%
High level cloud: 20%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

 8 / 14 mph 47 / 43°F 93% 1012 mb
Low level cloud: 29%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May		02:00

SSW
SSW

 11 / 19 mph 46 / 41°F 85% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

 13 / 22 mph 45 / 39°F 75% 1012 mb
Low level cloud: 90%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

 12 / 16 mph 42 / 35°F 81% 1014 mb
Low level cloud: 85%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

 10 / 12 mph 47 / 41°F 71% 1016 mb
Low level cloud: 75%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

 9 / 11 mph 50 / 45°F 67% 1017 mb
Low level cloud: 71%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

 8 / 9 mph 50 / 46°F 69% 1018 mb
Low level cloud: 77%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

 6 / 8 mph 47 / 44°F 73% 1019 mb
Low level cloud: 85%
Mid level cloud: 27%
High level cloud: 9%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNW
NNW

 3 / 5 mph 44 / 42°F 89% 1020 mb
Low level cloud: 85%
Mid level cloud: 25%
High level cloud: 10%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May		02:00

NNE
NNE

 3 / 4 mph 43 / 42°F 93% 1021 mb
Low level cloud: 89%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

 4 / 7 mph 43 / 40°F 95% 1021 mb
Low level cloud: 53%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

 6 / 8 mph 46 / 42°F 85% 1021 mb
Low level cloud: 30%
Mid level cloud: 40%
High level cloud: 5%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ESE
ESE

 8 / 9 mph 55 / 51°F 61% 1019 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

 8 / 9 mph 63 / 61°F 47% 1017 mb
Low level cloud: 8%
Mid level cloud: 50%
High level cloud: 33%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SE
SE

 10 / 13 mph 65 / 64°F 42% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 44%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SE
SE

 7 / 13 mph 59 / 56°F 59% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

 8 / 13 mph 52 / 49°F 79% 1014 mb
Low level cloud: 60%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May		02:00

SE
SE

 11 / 17 mph 50 / 45°F 90% 1013 mb
Low level cloud: 94%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
05:00

SE
SE

 13 / 19 mph 48 / 42°F 90% 1012 mb
Low level cloud: 94%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
08:00

SE
SE

 13 / 19 mph 47 / 41°F 93% 1010 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
11:00

SE
SE

 12 / 17 mph 47 / 42°F 94% 1008 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
14:00

SSE
SSE

 9 / 14 mph 49 / 45°F 96% 1009 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

SSW
SSW

 9 / 11 mph 55 / 52°F 93% 1009 mb
Low level cloud: 99%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSW
SSW

 11 / 19 mph 54 / 50°F 85% 1009 mb
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
23:00

SW
SW

 13 / 22 mph 47 / 42°F 75% 1012 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 05
May		02:00

SSW
SSW

 6 / 12 mph 47 / 44°F 92% 1002 mb
Low level cloud: 7%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
0.0 In
08:00

WSW
WSW

 9 / 13 mph 38 / 31°F 92% 1009 mb
Low level cloud: 99%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
14:00

WNW
WNW

 9 / 17 mph 41 / 35°F 69% 1018 mb
Low level cloud: 88%
Mid level cloud: 8%
High level cloud: 55%
Most Significant Cloud Type: low
97%
0.0 In
20:00

WNW
WNW

 6 / 11 mph 42 / 37°F 82% 1018 mb
Low level cloud: 43%
Mid level cloud: 63%
High level cloud: 14%
Most Significant Cloud Type: low
67%
0.0 In
Mon 06
May		02:00

W
W

 4 / 8 mph 36 / 32°F 99% 1002 mb
Low level cloud: 99%
Mid level cloud: 55%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
08:00

SW
SW

 12 / 19 mph 40 / 33°F 77% 1008 mb
Low level cloud: 81%
Mid level cloud: 97%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
14:00

WSW
WSW

 8 / 11 mph 41 / 36°F 97% 997 mb
Low level cloud: 100%
Mid level cloud: 69%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
20:00

NW
NW

 4 / 6 mph 52 / 51°F 76% 1015 mb
Low level cloud: 11%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: medium
74%
0.0 In
Tue 07
May		02:00

SE
SE

 6 / 9 mph 46 / 43°F 97% 1004 mb
Low level cloud: 96%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
08:00

NNW
NNW

 4 / 5 mph 47 / 45°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
14:00

SSW
SSW

 14 / 21 mph 57 / 54°F 94% 988 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
20:00

E
E

 2 / 4 mph 56 / 58°F 55% 1012 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Wed 08
May		02:00

NNE
NNE

 9 / 13 mph 44 / 40°F 95% 990 mb
Low level cloud: 100%
Mid level cloud: 51%
High level cloud: 50%
Most Significant Cloud Type: low
100%
0.1 In
08:00

SE
SE

 8 / 12 mph 52 / 49°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
14:00

NW
NW

 12 / 18 mph 40 / 33°F 78% 1002 mb
Low level cloud: 98%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
20:00

SSE
SSE

 13 / 21 mph 56 / 53°F 65% 1006 mb
Low level cloud: 95%
Mid level cloud: 1%
High level cloud: 17%
Most Significant Cloud Type: low
97%
0.0 In
Thu 09
May		02:00

NNW
NNW

 5 / 8 mph 32 / 27°F 97% 1012 mb
Low level cloud: 98%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
08:00

S
S

 13 / 21 mph 57 / 54°F 93% 1000 mb
Low level cloud: 100%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
14:00

NNW
NNW

 10 / 15 mph 47 / 43°F 37% 1011 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
20:00

SSW
SSW

 16 / 27 mph 63 / 63°F 45% 999 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 99%
Most Significant Cloud Type: medium
34%
0.0 In
Fri 10
May		02:00

ENE
ENE

 2 / 3 mph 29 / 29°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
08:00

NW
NW

 12 / 20 mph 37 / 30°F 90% 1009 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
14:00

WNW
WNW

 10 / 15 mph 57 / 54°F 31% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
0.0 In
20:00

NW
NW

 5 / 9 mph 46 / 44°F 51% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
Sat 11
May		02:00

WSW
WSW

 10 / 16 mph 47 / 42°F 82% 1011 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
08:00

S
S

 3 / 5 mph 41 / 40°F 61% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
0.0 In
14:00

SW
SW

 9 / 13 mph 50 / 47°F 88% 1010 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
20:00

SE
SE

 5 / 10 mph 52 / 51°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 37%
High level cloud: 33%
Most Significant Cloud Type: medium
37%
0.0 In
Sun 12
May		02:00

ESE
ESE

 7 / 15 mph 46 / 43°F 94% 1004 mb
Low level cloud: 4%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: medium
61%
0.1 In
08:00

ESE
ESE

 4 / 8 mph 47 / 46°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
0.0 In
14:00

SSE
SSE

 13 / 20 mph 52 / 47°F 96% 987 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.7 In
20:00

NE
NE

 5 / 10 mph 54 / 53°F 49% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: medium
12%
0.0 In
Mon 13
May		02:00

SSW
SSW

 6 / 12 mph 47 / 44°F 95% 992 mb
Low level cloud: 96%
Mid level cloud: 84%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.2 In
08:00

NNE
NNE

 6 / 10 mph 50 / 48°F 55% 1019 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: medium
45%
0.0 In
14:00

NW
NW

 12 / 23 mph 43 / 37°F 59% 1012 mb
Low level cloud: 100%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
20:00

NNE
NNE

 3 / 6 mph 56 / 57°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
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