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Lower White River Wilder 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Lower White River Wilder

Virgin Islands, United States Of America

Long range weather outlook for Lower White River Wilder includes 14 day forecast summary:

The next 14 day outlook for Lower White River Wilder shows the average daytime maximum temperature will be around -1°C, with a high for the two weeks of 5°C expected on the afternoon of Friday 26th. The average minimum temperature will be -7°C, dipping to its lowest on the morning of Saturday 27th at -12°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain, sleet or snow. Current predictions suggest Sunday 28th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Dec		01:00

W
W

 18 / 21 mph 27 / 14°F 66% 1004 mb
Low level cloud: 49%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 15 / 17 mph 22 / 9°F 67% 1011 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 10 / 13 mph 22 / 11°F 62% 1017 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

 9 / 11 mph 26 / 17°F 53% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 5 / 6 mph 31 / 26°F 45% 1019 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 3 / 3 mph 31 / 28°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 79%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 6 mph 30 / 25°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 9 / 15 mph 29 / 20°F 63% 1013 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec		19:00

NW
NW

 12 / 15 mph 25 / 13°F 71% 1020 mb
Low level cloud: 71%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 13 / 14 mph 21 / 9°F 72% 1022 mb
Low level cloud: 69%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Dec		01:00

NW
NW

 11 / 13 mph 18 / 5°F 67% 1025 mb
Low level cloud: 49%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 10 / 12 mph 17 / 4°F 66% 1027 mb
Low level cloud: 32%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 9 / 12 mph 16 / 5°F 64% 1029 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 11 / 13 mph 21 / 9°F 57% 1030 mb
Low level cloud: 16%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 10 / 12 mph 24 / 14°F 54% 1028 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 5 / 6 mph 23 / 17°F 66% 1029 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 2%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 2 / 3 mph 19 / 19°F 83% 1028 mb
Low level cloud: 15%
Mid level cloud: 13%
High level cloud: 15%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 1 / 2 mph 19 / 19°F 83% 1027 mb
Low level cloud: 36%
Mid level cloud: 16%
High level cloud: 22%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Dec		01:00

SSE
SSE

 2 / 4 mph 19 / 17°F 86% 1026 mb
Low level cloud: 23%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 2 / 4 mph 21 / 19°F 89% 1024 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 1 / 2 mph 21 / 21°F 93% 1024 mb
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 1 / 2 mph 27 / 28°F 83% 1023 mb
Low level cloud: 41%
Mid level cloud: 100%
High level cloud: 40%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 1 / 1 mph 31 / 31°F 78% 1019 mb
Low level cloud: 39%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 2 / 3 mph 28 / 26°F 88% 1019 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 2 / 3 mph 25 / 25°F 95% 1020 mb
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 4 mph 25 / 22°F 93% 1021 mb
Low level cloud: 51%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 24
Dec		01:00

SSE
SSE

 2 / 4 mph 23 / 21°F 92% 1021 mb
Low level cloud: 54%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 2 / 2 mph 24 / 24°F 90% 1023 mb
Low level cloud: 63%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 2 / 3 mph 25 / 23°F 95% 1024 mb
Low level cloud: 66%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 4 / 4 mph 30 / 26°F 84% 1026 mb
Low level cloud: 90%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 4 mph 35 / 32°F 73% 1024 mb
Low level cloud: 96%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 2 / 4 mph 30 / 29°F 84% 1026 mb
Low level cloud: 69%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 2 / 3 mph 24 / 24°F 92% 1027 mb
Low level cloud: 37%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 2 / 4 mph 25 / 24°F 93% 1026 mb
Low level cloud: 12%
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
Thu 25
Dec		01:00

SSE
SSE

 2 / 4 mph 27 / 25°F 92% 1024 mb
Low level cloud: 8%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 2 / 3 mph 27 / 27°F 94% 1022 mb
Low level cloud: 22%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 2 / 5 mph 23 / 20°F 98% 1021 mb
Low level cloud: 35%
Mid level cloud: 3%
High level cloud: 20%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 2 / 2 mph 33 / 33°F 84% 1020 mb
Low level cloud: 21%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 3 / 3 mph 37 / 35°F 75% 1016 mb
Low level cloud: 31%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 1 / 2 mph 32 / 32°F 92% 1016 mb
Low level cloud: 87%
Mid level cloud: 23%
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

SSW
SSW

 1 / 2 mph 31 / 31°F 94% 1015 mb
Low level cloud: 78%
Mid level cloud: 41%
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

S
S

 2 / 4 mph 31 / 30°F 94% 1012 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 26
Dec		01:00

SSE
SSE

 3 / 5 mph 32 / 29°F 96% 1009 mb
Low level cloud: 94%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 3 / 6 mph 32 / 28°F 98% 1005 mb
Low level cloud: 97%
Mid level cloud: 55%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 4 / 7 mph 32 / 28°F 99% 1001 mb
Low level cloud: 99%
Mid level cloud: 22%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 1 / 3 mph 32 / 32°F 99% 998 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 10 / 19 mph 40 / 34°F 93% 995 mb
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 15 / 19 mph 33 / 23°F 74% 1004 mb
Low level cloud: 13%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 14 / 17 mph 26 / 15°F 73% 1012 mb
Low level cloud: 66%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 14 / 16 mph 22 / 9°F 71% 1018 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 27
Dec		01:00

NNW
NNW

 2 / 4 mph 33 / 32°F 100% 1010 mb
Low level cloud: 98%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 7 / 13 mph 28 / 21°F 88% 1017 mb
Low level cloud: 40%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
13:00

NNW
NNW

 5 / 6 mph 29 / 24°F 85% 1010 mb
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
81%
0.0 In
19:00

NNW
NNW

 8 / 13 mph 17 / 6°F 80% 1024 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
Sun 28
Dec		01:00

SE
SE

 4 / 4 mph 25 / 20°F 87% 1018 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
45%
0.0 In
07:00

SSE
SSE

 9 / 12 mph 21 / 11°F 92% 1015 mb
Low level cloud: 69%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 10 / 12 mph 29 / 20°F 84% 1008 mb
Low level cloud: 71%
Mid level cloud: 80%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
19:00

WNW
WNW

 1 / 1 mph 19 / 19°F 81% 1030 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 6%
Most Significant Cloud Type: medium
27%
0.0 In
Mon 29
Dec		01:00

NE
NE

 1 / 2 mph 25 / 25°F 97% 1023 mb
Low level cloud: 79%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 1 / 2 mph 14 / 14°F 88% 1030 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

NNW
NNW

 7 / 8 mph 34 / 28°F 74% 1024 mb
Low level cloud: 98%
Mid level cloud: 10%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SE
SE

 2 / 5 mph 24 / 21°F 84% 1028 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: medium
89%
0.0 In
Tue 30
Dec		01:00

NNW
NNW

 9 / 13 mph 20 / 10°F 86% 1031 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
07:00

ESE
ESE

 4 / 6 mph 27 / 22°F 97% 1017 mb
Low level cloud: 80%
Mid level cloud: 95%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.3 In
13:00

NNW
NNW

 9 / 10 mph 29 / 20°F 55% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

NW
NW

 11 / 15 mph 31 / 22°F 86% 1022 mb
Low level cloud: 72%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.1 In
Wed 31
Dec		01:00

NNW
NNW

 1 / 2 mph 19 / 19°F 93% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
0.0 In
07:00

NW
NW

 3 / 6 mph 15 / 10°F 98% 1030 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
13:00

SSE
SSE

 3 / 4 mph 34 / 32°F 56% 1028 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 49%
Most Significant Cloud Type: medium
25%
0.0 In
19:00

SE
SE

 0 / 0 mph 30 / 30°F 95% 1030 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
36%
0.0 In
Thu 01
Jan		01:00

SE
SE

 2 / 4 mph 26 / 23°F 88% 1026 mb
Low level cloud: 0%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: medium
87%
0.0 In
07:00

SSW
SSW

 2 / 4 mph 24 / 22°F 98% 1029 mb
Low level cloud: 91%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
91%
0.0 In
13:00

SE
SE

 2 / 2 mph 37 / 37°F 65% 1024 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 97%
Most Significant Cloud Type: low
85%
0.0 In
19:00

W
W

 0 / 1 mph 29 / 29°F 98% 1025 mb
Low level cloud: 73%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: low
75%
0.0 In
Fri 02
Jan		01:00

SE
SE

 1 / 1 mph 31 / 31°F 89% 1023 mb
Low level cloud: 16%
Mid level cloud: 40%
High level cloud: 37%
Most Significant Cloud Type: low
34%
0.0 In
07:00

N
N

 2 / 5 mph 23 / 20°F 99% 1030 mb
Low level cloud: 83%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
85%
0.0 In
13:00

SSE
SSE

 3 / 4 mph 41 / 40°F 71% 1018 mb
Low level cloud: 21%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: low
31%
0.0 In
19:00

SE
SE

 6 / 9 mph 31 / 25°F 85% 1035 mb
Low level cloud: 99%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
Sat 03
Jan		01:00

SE
SE

 3 / 7 mph 29 / 25°F 95% 1014 mb
Low level cloud: 50%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
70%
0.0 In
07:00

ESE
ESE

 3 / 6 mph 21 / 17°F 97% 1037 mb
Low level cloud: 39%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
13:00

ESE
ESE

 3 / 4 mph 33 / 30°F 96% 1008 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SE
SE

 3 / 6 mph 29 / 25°F 95% 1034 mb
Low level cloud: 83%
Mid level cloud: 50%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
Sun 04
Jan		01:00

NE
NE

 0 / 0 mph 33 / 33°F 99% 1006 mb
Low level cloud: 90%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
07:00

S
S

 2 / 4 mph 31 / 29°F 98% 1031 mb
Low level cloud: 83%
Mid level cloud: 100%
High level cloud: 83%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 4 / 5 mph 35 / 32°F 87% 1010 mb
Low level cloud: 89%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
91%
0.0 In
19:00

NNW
NNW

 1 / 2 mph 35 / 35°F 99% 1031 mb
Low level cloud: 64%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
81%
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