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Clervaux 14 Day Long Range Forecast

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

Luxembourg

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

The forecast for Clervaux in the coming two weeks is predicting the average daytime maximum temperature will be around 6°C, with a high for the two weeks of 8°C expected on the afternoon of Thursday 12th. The mean minimum temperature will be 2°C, dipping to its lowest on the afternoon of Sunday 15th at -3°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain or snow. It looks like Sunday 15th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 05
Feb		19:00

ESE
ESE

 6 / 10 mph 39 / 34°F 90% 989 mb
Low level cloud: 72%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 6 / 10 mph 38 / 33°F 92% 988 mb
Low level cloud: 26%
Mid level cloud: 23%
High level cloud: 69%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 06
Feb		01:00

ESE
ESE

 4 / 7 mph 37 / 33°F 89% 988 mb
Low level cloud: 6%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 9 mph 35 / 31°F 86% 989 mb
Low level cloud: 28%
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
07:00

ESE
ESE

 4 / 8 mph 35 / 31°F 87% 990 mb
Low level cloud: 48%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 6 / 8 mph 38 / 33°F 84% 991 mb
Low level cloud: 89%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 5 / 6 mph 40 / 37°F 95% 992 mb
Low level cloud: 99%
Mid level cloud: 83%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 4 / 5 mph 41 / 39°F 99% 994 mb
Low level cloud: 99%
Mid level cloud: 90%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSW
SSW

 5 / 10 mph 39 / 36°F 97% 996 mb
Low level cloud: 90%
Mid level cloud: 76%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 6 / 13 mph 37 / 33°F 98% 998 mb
Low level cloud: 99%
Mid level cloud: 68%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 07
Feb		01:00

SSW
SSW

 5 / 8 mph 41 / 38°F 99% 1000 mb
Low level cloud: 99%
Mid level cloud: 89%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 7 / 11 mph 41 / 37°F 94% 1001 mb
Low level cloud: 85%
Mid level cloud: 91%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 5 / 9 mph 40 / 36°F 89% 1002 mb
Low level cloud: 29%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 7 / 10 mph 40 / 35°F 91% 1004 mb
Low level cloud: 79%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 7 / 10 mph 42 / 37°F 85% 1005 mb
Low level cloud: 100%
Mid level cloud: 22%
High level cloud: 88%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 6 / 9 mph 44 / 40°F 80% 1005 mb
Low level cloud: 52%
Mid level cloud: 14%
High level cloud: 65%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 9 mph 40 / 37°F 92% 1007 mb
Low level cloud: 86%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 8 mph 41 / 38°F 93% 1008 mb
Low level cloud: 26%
Mid level cloud: 57%
High level cloud: 33%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 08
Feb		01:00

SSE
SSE

 4 / 7 mph 41 / 38°F 93% 1008 mb
Low level cloud: 23%
Mid level cloud: 58%
High level cloud: 99%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 3 / 6 mph 40 / 38°F 91% 1009 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 2 / 3 mph 40 / 40°F 89% 1009 mb
Low level cloud: 14%
Mid level cloud: 40%
High level cloud: 20%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 1 / 2 mph 43 / 42°F 86% 1010 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 2 / 4 mph 45 / 44°F 78% 1010 mb
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 10%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 3 / 4 mph 45 / 44°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 18%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 4 / 6 mph 44 / 42°F 89% 1011 mb
Low level cloud: 2%
Mid level cloud: 28%
High level cloud: 13%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 4 / 6 mph 42 / 40°F 92% 1011 mb
Low level cloud: 12%
Mid level cloud: 23%
High level cloud: 12%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 09
Feb		01:00

E
E

 4 / 7 mph 37 / 35°F 94% 1011 mb
Low level cloud: 26%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 3 / 6 mph 36 / 33°F 96% 1011 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 3 / 5 mph 35 / 33°F 94% 1011 mb
Low level cloud: 32%
Mid level cloud: 61%
High level cloud: 12%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 4 / 6 mph 38 / 34°F 85% 1011 mb
Low level cloud: 11%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 7 / 9 mph 42 / 37°F 73% 1010 mb
Low level cloud: 32%
Mid level cloud: 32%
High level cloud: 15%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 6 / 9 mph 42 / 37°F 73% 1008 mb
Low level cloud: 21%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 9 mph 37 / 33°F 89% 1009 mb
Low level cloud: 43%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 5 / 8 mph 35 / 31°F 90% 1009 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 94%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 10
Feb		01:00

SE
SE

 4 / 7 mph 34 / 31°F 89% 1008 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 63%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 4 / 7 mph 33 / 30°F 91% 1007 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 60%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 4 / 8 mph 32 / 28°F 91% 1006 mb
Low level cloud: 13%
Mid level cloud: 97%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 7 / 11 mph 35 / 29°F 83% 1005 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 12 / 16 mph 40 / 33°F 74% 1001 mb
Low level cloud: 21%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 11 / 16 mph 41 / 35°F 76% 998 mb
Low level cloud: 54%
Mid level cloud: 58%
High level cloud: 8%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 10 / 16 mph 38 / 31°F 92% 996 mb
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 9 / 14 mph 39 / 32°F 98% 993 mb
Low level cloud: 100%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 11
Feb		01:00

S
S

 10 / 16 mph 40 / 34°F 98% 990 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

WSW
WSW

 12 / 25 mph 39 / 31°F 98% 989 mb
Low level cloud: 99%
Mid level cloud: 68%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 19 / 41 mph 39 / 29°F 95% 990 mb
Low level cloud: 92%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

WSW
WSW

 19 / 32 mph 43 / 34°F 88% 992 mb
Low level cloud: 91%
Mid level cloud: 21%
High level cloud: 15%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 16 / 22 mph 46 / 39°F 80% 992 mb
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 52%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 16 / 19 mph 46 / 40°F 91% 994 mb
Low level cloud: 89%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 15 / 18 mph 44 / 37°F 81% 996 mb
Low level cloud: 97%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 14 / 19 mph 42 / 34°F 89% 998 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 12
Feb		01:00

SW
SW

 16 / 29 mph 40 / 32°F 94% 988 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 17 / 36 mph 36 / 26°F 97% 997 mb
Low level cloud: 100%
Mid level cloud: 72%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNE
NNE

 17 / 23 mph 28 / 15°F 71% 1001 mb
Low level cloud: 9%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SW
SW

 8 / 13 mph 40 / 35°F 97% 996 mb
Low level cloud: 99%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 13
Feb		01:00

NW
NW

 2 / 3 mph 38 / 38°F 93% 1000 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

 4 / 7 mph 39 / 35°F 97% 994 mb
Low level cloud: 85%
Mid level cloud: 64%
High level cloud: 90%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

 18 / 28 mph 43 / 35°F 84% 998 mb
Low level cloud: 51%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
80%
0.0 In
19:00

W
W

 15 / 26 mph 34 / 25°F 89% 999 mb
Low level cloud: 69%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
Sat 14
Feb		01:00

NW
NW

 9 / 17 mph 39 / 33°F 96% 985 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 13 / 24 mph 29 / 19°F 94% 998 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

 8 / 15 mph 41 / 36°F 97% 989 mb
Low level cloud: 98%
Mid level cloud: 68%
High level cloud: 73%
Most Significant Cloud Type: low
100%
0.2 In
19:00

WNW
WNW

 14 / 27 mph 33 / 23°F 90% 1006 mb
Low level cloud: 69%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.1 In
Sun 15
Feb		01:00

NE
NE

 7 / 15 mph 29 / 22°F 97% 991 mb
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NW
NW

 5 / 10 mph 25 / 19°F 95% 1013 mb
Low level cloud: 88%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: low
91%
0.0 In
13:00

N
N

 16 / 32 mph 34 / 24°F 96% 995 mb
Low level cloud: 74%
Mid level cloud: 98%
High level cloud: 59%
Most Significant Cloud Type: low
100%
0.6 In
19:00

NE
NE

 6 / 11 mph 27 / 21°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 16
Feb		01:00

WNW
WNW

 5 / 10 mph 18 / 10°F 93% 1010 mb
Low level cloud: 57%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: low
58%
0.0 In
07:00

NE
NE

 4 / 7 mph 25 / 21°F 83% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

SSW
SSW

 15 / 31 mph 30 / 19°F 98% 1005 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NE
NE

 6 / 11 mph 28 / 22°F 85% 1014 mb
Low level cloud: 8%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
Tue 17
Feb		01:00

SE
SE

 5 / 10 mph 23 / 17°F 100% 1003 mb
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
07:00

NE
NE

 14 / 27 mph 19 / 5°F 82% 1009 mb
Low level cloud: 23%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
13:00

SW
SW

 14 / 28 mph 35 / 26°F 100% 990 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
19:00

NNE
NNE

 15 / 28 mph 24 / 11°F 70% 1010 mb
Low level cloud: 9%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
69%
0.0 In
Wed 18
Feb		01:00

W
W

 17 / 34 mph 27 / 15°F 98% 989 mb
Low level cloud: 98%
Mid level cloud: 94%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.2 In
07:00

NNE
NNE

 13 / 26 mph 18 / 4°F 80% 1016 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
13:00

NNW
NNW

 17 / 34 mph 33 / 22°F 91% 1010 mb
Low level cloud: 63%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NE
NE

 6 / 12 mph 22 / 15°F 71% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 19
Feb		01:00

N
N

 4 / 8 mph 22 / 17°F 99% 1029 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
40%
0.0 In
07:00

E
E

 5 / 9 mph 20 / 13°F 89% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

 9 / 19 mph 31 / 23°F 79% 1031 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 5%
Most Significant Cloud Type: medium
32%
0.0 In
19:00

ESE
ESE

 8 / 15 mph 26 / 18°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 20
Feb		01:00

SSE
SSE

 5 / 10 mph 28 / 22°F 90% 1030 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 17%
Most Significant Cloud Type: medium
19%
0.0 In
07:00

SSE
SSE

 4 / 9 mph 25 / 20°F 71% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
0.0 In
13:00

S
S

 6 / 13 mph 35 / 29°F 92% 1028 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 91%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

S
S

 4 / 8 mph 33 / 29°F 70% 1031 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In

Other Locations Near to Clervaux

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