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Les Arcs 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Les Arcs

France

Long range weather outlook for Les Arcs includes 14 day forecast summary:

The outlook for Les Arcs in the two weeks ahead shows the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the evening of Monday 12th. The mean minimum temperature will be 11°C, dipping to its lowest on the evening of Friday 16th at 6°C. Expect the following 14 days ahead to have mixed weather with some days dry and some seeing a little rain. It looks like Monday 12th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 12
May		19:00

WNW
WNW

 5 / 8 mph 68 / 66°F 60% 1010 mb
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
22:00

WNW
WNW

 7 / 12 mph 58 / 57°F 76% 1012 mb
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
Tue 13
May		01:00

WNW
WNW

 7 / 12 mph 56 / 54°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 4 / 8 mph 54 / 54°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 28%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 1 / 3 mph 50 / 50°F 69% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 5 / 11 mph 58 / 56°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 9 / 19 mph 62 / 60°F 49% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 6 / 13 mph 60 / 57°F 57% 1013 mb
Low level cloud: 22%
Mid level cloud: 28%
High level cloud: 6%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 3 / 5 mph 56 / 55°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 3 / 6 mph 57 / 58°F 86% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May		01:00

NNE
NNE

 2 / 3 mph 57 / 57°F 87% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 55 / 55°F 92% 1015 mb
Low level cloud: 26%
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
07:00

NNE
NNE

 3 / 6 mph 50 / 49°F 79% 1016 mb
Low level cloud: 15%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 8 / 16 mph 59 / 56°F 52% 1015 mb
Low level cloud: 11%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 10 / 20 mph 59 / 56°F 52% 1015 mb
Low level cloud: 8%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 8 / 17 mph 59 / 57°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 3 / 6 mph 56 / 55°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 3 / 6 mph 58 / 59°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May		01:00

N
N

 3 / 5 mph 58 / 59°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 3 / 6 mph 57 / 57°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 20%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 2 / 4 mph 53 / 53°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 4 / 8 mph 63 / 61°F 48% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 7 / 14 mph 67 / 64°F 42% 1009 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 6 / 12 mph 66 / 64°F 46% 1008 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 8 mph 59 / 57°F 62% 1008 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 1%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 3 / 6 mph 61 / 61°F 76% 1008 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 16
May		01:00

N
N

 3 / 6 mph 61 / 61°F 79% 1008 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 50%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 3 / 6 mph 59 / 59°F 87% 1008 mb
Low level cloud: 0%
Mid level cloud: 11%
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

NE
NE

 2 / 5 mph 54 / 53°F 77% 1009 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
10:00

E
E

 13 / 27 mph 57 / 53°F 65% 1011 mb
Low level cloud: 27%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 9 / 19 mph 53 / 50°F 72% 1013 mb
Low level cloud: 75%
Mid level cloud: 31%
High level cloud: 1%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 8 / 17 mph 53 / 49°F 75% 1014 mb
Low level cloud: 39%
Mid level cloud: 65%
High level cloud: 33%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 2 / 4 mph 48 / 48°F 92% 1015 mb
Low level cloud: 17%
Mid level cloud: 76%
High level cloud: 29%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NNW
NNW

 2 / 4 mph 56 / 57°F 91% 1017 mb
Low level cloud: 1%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 17
May		01:00

NNW
NNW

 3 / 5 mph 58 / 59°F 88% 1017 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 6%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 3 / 4 mph 56 / 57°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 2 / 4 mph 49 / 48°F 81% 1018 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 5 / 11 mph 57 / 55°F 57% 1019 mb
Low level cloud: 71%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 7 / 15 mph 57 / 53°F 52% 1019 mb
Low level cloud: 43%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 1 / 2 mph 56 / 54°F 55% 1018 mb
Low level cloud: 50%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 2 / 5 mph 57 / 56°F 62% 1018 mb
Low level cloud: 6%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 3 / 5 mph 57 / 58°F 80% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 18
May		01:00

NW
NW

 4 / 7 mph 57 / 57°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 3 / 5 mph 56 / 56°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 1 / 3 mph 52 / 51°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 9 mph 60 / 58°F 50% 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
13:00

SSE
SSE

 9 / 18 mph 65 / 63°F 39% 1021 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 7 / 14 mph 64 / 61°F 49% 1020 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 3 / 6 mph 60 / 60°F 66% 1021 mb
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 3 / 6 mph 59 / 59°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 19
May		01:00

NW
NW

 4 / 8 mph 67 / 67°F 77% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

NE
NE

 3 / 7 mph 53 / 53°F 80% 1022 mb
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 99%
Most Significant Cloud Type: low
25%
0.0 In
13:00

ESE
ESE

 6 / 12 mph 58 / 58°F 72% 1018 mb
Low level cloud: 44%
Mid level cloud: 11%
High level cloud: 37%
Most Significant Cloud Type: low
51%
0.0 In
19:00

ESE
ESE

 5 / 10 mph 63 / 64°F 72% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 20
May		01:00

NE
NE

 6 / 12 mph 62 / 62°F 87% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

NNE
NNE

 3 / 6 mph 51 / 50°F 80% 1016 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
16%
0.0 In
13:00

E
E

 14 / 30 mph 56 / 52°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 43%
Most Significant Cloud Type: medium
63%
0.0 In
19:00

E
E

 5 / 11 mph 69 / 69°F 64% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.0 In
Wed 21
May		01:00

WNW
WNW

 7 / 15 mph 60 / 60°F 93% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.1 In
07:00

NE
NE

 9 / 19 mph 60 / 60°F 81% 1018 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 93%
Most Significant Cloud Type: medium
53%
0.0 In
13:00

SSE
SSE

 3 / 6 mph 67 / 67°F 42% 1011 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 6%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

E
E

 7 / 14 mph 54 / 53°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: medium
50%
0.0 In
Thu 22
May		01:00

NNW
NNW

 3 / 6 mph 65 / 65°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

ENE
ENE

 4 / 8 mph 52 / 52°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 32%
Most Significant Cloud Type: medium
41%
0.0 In
13:00

SSE
SSE

 5 / 11 mph 65 / 65°F 44% 1013 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 36%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

ESE
ESE

 4 / 9 mph 58 / 57°F 74% 1016 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
10%
0.0 In
Fri 23
May		01:00

NW
NW

 3 / 7 mph 66 / 66°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 49%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

WSW
WSW

 1 / 2 mph 55 / 55°F 78% 1016 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
18%
0.0 In
13:00

SE
SE

 9 / 19 mph 65 / 65°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

SE
SE

 3 / 7 mph 63 / 63°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
Sat 24
May		01:00

NW
NW

 1 / 3 mph 69 / 69°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

ENE
ENE

 3 / 5 mph 55 / 55°F 81% 1014 mb
Low level cloud: 40%
Mid level cloud: 5%
High level cloud: 95%
Most Significant Cloud Type: low
52%
0.0 In
13:00

SSE
SSE

 9 / 19 mph 66 / 66°F 48% 1014 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
19:00

SSE
SSE

 3 / 7 mph 64 / 64°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
8%
0.0 In
Sun 25
May		01:00

N
N

 2 / 5 mph 68 / 68°F 79% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 71%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

SE
SE

 1 / 3 mph 56 / 56°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 92%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

SE
SE

 10 / 20 mph 65 / 65°F 46% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

S
S

 3 / 7 mph 64 / 64°F 60% 1012 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 26
May		01:00

NNE
NNE

 3 / 7 mph 67 / 67°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

ESE
ESE

 2 / 4 mph 58 / 60°F 69% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 16%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

ESE
ESE

 9 / 20 mph 66 / 66°F 43% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 37%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

SE
SE

 5 / 11 mph 59 / 58°F 67% 1012 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
0.0 In
Tue 27
May		01:00

NE
NE

 4 / 9 mph 67 / 67°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: medium
28%
0.0 In
07:00

N
N

 1 / 2 mph 54 / 54°F 79% 1011 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
45%
0.0 In
13:00

ESE
ESE

 11 / 22 mph 68 / 68°F 41% 1017 mb
Low level cloud: 0%
Mid level cloud: 94%
High level cloud: 31%
Most Significant Cloud Type: medium
95%
0.0 In
19:00

W
W

 4 / 9 mph 67 / 67°F 61% 1007 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 94%
Most Significant Cloud Type: medium
15%
0.1 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