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Mclean 14 Day Long Range Forecast

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

Virginia, United States Of America

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

The next 14 day outlook for Mclean shows the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 20°C expected on the afternoon of Sunday 9th. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Tuesday 11th at 0°C. The fortnight ahead will have most days seeing a little rain or snow. The current forecast indicates Monday 10th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 06
Nov		01:00

NW
NW

 14 / 16 mph 57 / 54°F 55% 1015 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

NW
NW

 12 / 18 mph 49 / 45°F 54% 1018 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
07:00

NW
NW

 9 / 11 mph 50 / 46°F 50% 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
10:00

NW
NW

 12 / 14 mph 53 / 49°F 37% 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
13:00

NW
NW

 12 / 14 mph 57 / 54°F 27% 1021 mb
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
16:00

NW
NW

 8 / 11 mph 57 / 55°F 29% 1021 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 3 / 4 mph 52 / 52°F 41% 1022 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
22:00

NE
NE

 1 / 2 mph 49 / 49°F 45% 1022 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
Fri 07
Nov		19:00

SSW
SSW

 13 / 18 mph 59 / 56°F 71% 1008 mb
Low level cloud: 14%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 11 / 18 mph 58 / 55°F 81% 1007 mb
Low level cloud: 3%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Nov		01:00

SSW
SSW

 9 / 13 mph 57 / 55°F 92% 1007 mb
Low level cloud: 29%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
60%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
04:00

WSW
WSW

 4 / 7 mph 56 / 55°F 95% 1006 mb
Low level cloud: 44%
Mid level cloud: 43%
High level cloud: 94%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 4 / 7 mph 55 / 53°F 97% 1008 mb
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 7 / 8 mph 62 / 61°F 71% 1010 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 6 / 7 mph 67 / 66°F 49% 1010 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
16:00

NE
NE

 2 / 3 mph 66 / 66°F 51% 1010 mb
Low level cloud: 5%
Mid level cloud: 75%
High level cloud: 93%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 3 / 4 mph 62 / 62°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 3 / 4 mph 60 / 60°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 09
Nov		01:00

SE
SE

 4 / 5 mph 57 / 58°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 5 / 9 mph 54 / 53°F 85% 1011 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 4 / 7 mph 55 / 54°F 92% 1010 mb
Low level cloud: 53%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 7 / 9 mph 61 / 60°F 83% 1009 mb
Low level cloud: 80%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 8 / 11 mph 68 / 67°F 69% 1007 mb
Low level cloud: 40%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 2 / 3 mph 68 / 67°F 62% 1007 mb
Low level cloud: 14%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 11 / 14 mph 62 / 62°F 66% 1009 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 16%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 12 / 16 mph 50 / 45°F 87% 1011 mb
Low level cloud: 56%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Mon 10
Nov		01:00

NW
NW

 11 / 15 mph 47 / 42°F 85% 1011 mb
Low level cloud: 49%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
04:00

NW
NW

 11 / 14 mph 43 / 37°F 89% 1012 mb
Low level cloud: 94%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

NW
NW

 10 / 14 mph 41 / 34°F 85% 1013 mb
Low level cloud: 49%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 13 / 15 mph 43 / 36°F 65% 1014 mb
Low level cloud: 74%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 13 / 15 mph 47 / 42°F 35% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 12 / 14 mph 45 / 39°F 33% 1015 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 11 / 13 mph 40 / 34°F 40% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 11 / 13 mph 38 / 31°F 42% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 11
Nov		01:00

WNW
WNW

 9 / 11 mph 35 / 28°F 43% 1020 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

W
W

 7 / 10 mph 33 / 26°F 50% 1021 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
07:00

W
W

 8 / 13 mph 33 / 25°F 61% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 11 / 13 mph 40 / 33°F 37% 1024 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

W
W

 9 / 11 mph 46 / 41°F 27% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 7 / 11 mph 46 / 42°F 29% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 13%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 10 / 14 mph 44 / 38°F 37% 1019 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 11 / 17 mph 42 / 36°F 42% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 12
Nov		01:00

SSW
SSW

 12 / 18 mph 42 / 36°F 44% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 11 / 15 mph 41 / 35°F 49% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 93%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 9 / 13 mph 41 / 34°F 52% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 9 / 11 mph 48 / 44°F 40% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 11 / 13 mph 60 / 59°F 35% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 11 / 17 mph 61 / 61°F 39% 1009 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 10 / 14 mph 57 / 55°F 50% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 8 / 12 mph 54 / 52°F 54% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 13
Nov		01:00

W
W

 10 / 16 mph 51 / 48°F 58% 1009 mb
Low level cloud: 42%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
07:00

WNW
WNW

 11 / 14 mph 48 / 43°F 55% 1015 mb
Low level cloud: 4%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
13:00

WNW
WNW

 12 / 14 mph 55 / 52°F 40% 1015 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 48%
Most Significant Cloud Type: low
14%
0.0 In
19:00

WNW
WNW

 5 / 6 mph 59 / 60°F 51% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 65%
Most Significant Cloud Type: medium
4%
0.0 In
Fri 14
Nov		01:00

NW
NW

 8 / 11 mph 47 / 44°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

WNW
WNW

 8 / 14 mph 42 / 36°F 66% 1017 mb
Low level cloud: 10%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
13:00

NW
NW

 11 / 18 mph 51 / 46°F 38% 1016 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: low
8%
0.0 In
19:00

SSW
SSW

 3 / 5 mph 58 / 58°F 49% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: medium
23%
0.0 In
Sat 15
Nov		01:00

SSE
SSE

 3 / 5 mph 46 / 45°F 44% 1015 mb
Low level cloud: 27%
Mid level cloud: 78%
High level cloud: 33%
Most Significant Cloud Type: low
58%
0.0 In
07:00

SSW
SSW

 7 / 11 mph 48 / 45°F 53% 1004 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
0.0 In
13:00

WSW
WSW

 5 / 7 mph 51 / 49°F 76% 1000 mb
Low level cloud: 71%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.1 In
19:00

WSW
WSW

 4 / 6 mph 59 / 59°F 75% 1001 mb
Low level cloud: 13%
Mid level cloud: 43%
High level cloud: 7%
Most Significant Cloud Type: medium
80%
0.0 In
Sun 16
Nov		01:00

N
N

 7 / 11 mph 46 / 42°F 77% 1007 mb
Low level cloud: 59%
Mid level cloud: 46%
High level cloud: 84%
Most Significant Cloud Type: low
84%
0.0 In
07:00

S
S

 14 / 23 mph 57 / 53°F 85% 990 mb
Low level cloud: 52%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
79%
0.0 In
13:00

NNW
NNW

 4 / 5 mph 49 / 48°F 46% 1009 mb
Low level cloud: 55%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
77%
0.0 In
19:00

SSW
SSW

 9 / 15 mph 54 / 51°F 89% 990 mb
Low level cloud: 10%
Mid level cloud: 59%
High level cloud: 93%
Most Significant Cloud Type: medium
90%
0.1 In
Mon 17
Nov		01:00

SSE
SSE

 5 / 8 mph 45 / 42°F 82% 1004 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 13 / 25 mph 39 / 31°F 61% 998 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
13:00

NNW
NNW

 13 / 19 mph 48 / 42°F 63% 1007 mb
Low level cloud: 58%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
19:00

WNW
WNW

 14 / 26 mph 43 / 37°F 52% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 18
Nov		01:00

NW
NW

 3 / 5 mph 47 / 46°F 73% 1016 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: low
7%
0.0 In
07:00

WNW
WNW

 9 / 17 mph 36 / 29°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
0.0 In
13:00

NNW
NNW

 6 / 9 mph 50 / 48°F 42% 1020 mb
Low level cloud: 25%
Mid level cloud: 18%
High level cloud: 32%
Most Significant Cloud Type: low
35%
0.0 In
19:00

N
N

 3 / 6 mph 49 / 48°F 52% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
0.0 In
Wed 19
Nov		01:00

N
N

 2 / 4 mph 46 / 46°F 69% 1024 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

S
S

 4 / 7 mph 42 / 39°F 60% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 86%
Most Significant Cloud Type: medium
9%
0.0 In
13:00

NNW
NNW

 3 / 4 mph 53 / 54°F 45% 1025 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 83%
Most Significant Cloud Type: medium
19%
0.0 In
19:00

SSE
SSE

 5 / 9 mph 54 / 53°F 55% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 20
Nov		01:00

NNE
NNE

 3 / 5 mph 43 / 42°F 66% 1026 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

SE
SE

 2 / 4 mph 45 / 46°F 69% 1025 mb
Low level cloud: 2%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: medium
33%
0.0 In
13:00

SSE
SSE

 2 / 4 mph 53 / 53°F 46% 1024 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SE
SE

 4 / 8 mph 63 / 63°F 51% 1023 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
Fri 21
Nov		01:00

SSE
SSE

 3 / 5 mph 43 / 41°F 80% 1022 mb
Low level cloud: 43%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
70%
0.0 In
07:00

S
S

 4 / 7 mph 53 / 53°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: medium
12%
0.0 In
13:00

SE
SE

 3 / 4 mph 47 / 47°F 95% 1021 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SSE
SSE

 6 / 11 mph 59 / 58°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: high
87%
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