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Mad River Glen 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Mad River Glen

Virgin Islands, United States Of America

Long range weather outlook for Mad River Glen includes 14 day forecast summary:

The outlook for Mad River Glen in the two weeks ahead shows the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 26°C expected on the afternoon of Thursday 18th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 9th at 6°C. The next 14 days will remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 09
Sep
16:00

SSE
SSE

5 / 6 mph 72 / 75°F 39% 1025 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

4 / 8 mph 60 / 59°F 68% 1026 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
22:00

SSE
SSE

4 / 8 mph 56 / 56°F 76% 1027 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
Wed 10
Sep
01:00

SSE
SSE

4 / 7 mph 53 / 52°F 88% 1027 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

SE
SE

3 / 6 mph 49 / 48°F 92% 1027 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

SE
SE

3 / 5 mph 53 / 52°F 73% 1026 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

SE
SE

4 / 4 mph 67 / 65°F 35% 1025 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

1 / 2 mph 74 / 73°F 27% 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
16:00

E
E

1 / 1 mph 74 / 74°F 32% 1021 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
19:00

WSW
WSW

1 / 1 mph 60 / 58°F 60% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

0 / 0 mph 55 / 55°F 63% 1021 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
Thu 11
Sep
01:00

SSE
SSE

1 / 2 mph 54 / 54°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

0 / 1 mph 52 / 52°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 34%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 3 mph 57 / 56°F 67% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

6 / 6 mph 69 / 67°F 48% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 6%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

8 / 9 mph 72 / 75°F 45% 1020 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

8 / 11 mph 69 / 68°F 51% 1020 mb
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

3 / 6 mph 60 / 59°F 87% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

3 / 5 mph 54 / 55°F 95% 1023 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
Fri 12
Sep
01:00

NE
NE

1 / 2 mph 51 / 51°F 83% 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
04:00

NNE
NNE

1 / 1 mph 47 / 47°F 80% 1025 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

NE
NE

1 / 1 mph 50 / 50°F 67% 1025 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

N
N

3 / 4 mph 64 / 63°F 40% 1025 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

4 / 4 mph 69 / 68°F 31% 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
16:00

NW
NW

5 / 7 mph 68 / 66°F 36% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

1 / 2 mph 57 / 56°F 63% 1023 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
22:00

W
W

0 / 1 mph 53 / 53°F 58% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 86%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 13
Sep
01:00

SSE
SSE

1 / 3 mph 53 / 53°F 58% 1023 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

2 / 5 mph 52 / 52°F 58% 1022 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 12%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

1 / 2 mph 56 / 54°F 58% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

2 / 2 mph 69 / 67°F 38% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

5 / 6 mph 73 / 75°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

3 / 4 mph 72 / 69°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 64%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

4 / 7 mph 65 / 63°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

3 / 5 mph 62 / 62°F 60% 1017 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Sep
01:00

SW
SW

2 / 5 mph 58 / 59°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

3 / 5 mph 56 / 57°F 83% 1016 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
07:00

SW
SW

2 / 4 mph 61 / 59°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

4 / 5 mph 73 / 76°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 6%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

8 / 10 mph 75 / 76°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

8 / 11 mph 71 / 69°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

3 / 6 mph 62 / 60°F 82% 1018 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

2 / 4 mph 54 / 55°F 93% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Sep
01:00

N
N

1 / 1 mph 52 / 52°F 92% 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
04:00

NNE
NNE

2 / 3 mph 49 / 49°F 94% 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
07:00

NNE
NNE

2 / 4 mph 52 / 51°F 80% 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
10:00

NNE
NNE

4 / 4 mph 65 / 63°F 47% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

4 / 4 mph 71 / 69°F 37% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

2 / 3 mph 71 / 69°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

1 / 2 mph 57 / 57°F 73% 1024 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
22:00

SE
SE

2 / 3 mph 56 / 56°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 16
Sep
01:00

SSE
SSE

3 / 6 mph 56 / 57°F 94% 1025 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
07:00

SE
SE

2 / 3 mph 59 / 59°F 97% 1023 mb
Low level cloud: 63%
Mid level cloud: 86%
High level cloud: 18%
Most Significant Cloud Type: low
95%
0.0 In
13:00

NNW
NNW

10 / 11 mph 67 / 67°F 62% 1017 mb
Low level cloud: 36%
Mid level cloud: 21%
High level cloud: 38%
Most Significant Cloud Type: low
47%
0.0 In
19:00

NE
NE

2 / 3 mph 62 / 62°F 94% 1020 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
39%
0.0 In
Wed 17
Sep
01:00

SSE
SSE

3 / 6 mph 55 / 55°F 92% 1024 mb
Low level cloud: 14%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
0.0 In
07:00

SSE
SSE

1 / 2 mph 64 / 64°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

SSW
SSW

5 / 5 mph 81 / 81°F 41% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

S
S

3 / 7 mph 66 / 66°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Thu 18
Sep
01:00

S
S

5 / 10 mph 62 / 62°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

SSE
SSE

3 / 5 mph 60 / 60°F 80% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SW
SW

5 / 6 mph 83 / 83°F 41% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

S
S

4 / 8 mph 65 / 65°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 19
Sep
01:00

SSW
SSW

5 / 10 mph 65 / 65°F 82% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

SSE
SSE

3 / 5 mph 60 / 60°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NW
NW

7 / 9 mph 76 / 78°F 56% 1014 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 29%
Most Significant Cloud Type: medium
79%
0.0 In
19:00

S
S

5 / 10 mph 67 / 67°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: medium
25%
0.0 In
Sat 20
Sep
01:00

NE
NE

2 / 5 mph 48 / 48°F 71% 1022 mb
Low level cloud: 39%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
61%
0.0 In
07:00

WNW
WNW

3 / 4 mph 60 / 60°F 96% 1012 mb
Low level cloud: 92%
Mid level cloud: 61%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SE
SE

6 / 7 mph 51 / 49°F 97% 1026 mb
Low level cloud: 88%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

NNW
NNW

2 / 3 mph 57 / 58°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 21
Sep
01:00

SE
SE

5 / 8 mph 45 / 42°F 95% 1025 mb
Low level cloud: 60%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.0 In
07:00

NNW
NNW

1 / 1 mph 53 / 53°F 66% 1018 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

7 / 9 mph 58 / 57°F 78% 1022 mb
Low level cloud: 89%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNE
NNE

1 / 2 mph 58 / 58°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 22
Sep
01:00

SE
SE

5 / 9 mph 55 / 54°F 99% 1018 mb
Low level cloud: 70%
Mid level cloud: 14%
High level cloud: 92%
Most Significant Cloud Type: low
86%
0.0 In
07:00

SE
SE

2 / 3 mph 55 / 56°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

SW
SW

7 / 10 mph 71 / 71°F 61% 1015 mb
Low level cloud: 34%
Mid level cloud: 32%
High level cloud: 63%
Most Significant Cloud Type: low
52%
0.0 In
19:00

S
S

4 / 9 mph 61 / 61°F 61% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Tue 23
Sep
01:00

ESE
ESE

2 / 3 mph 61 / 61°F 98% 1014 mb
Low level cloud: 43%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.0 In
07:00

S
S

4 / 5 mph 59 / 59°F 79% 1021 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 9%
Most Significant Cloud Type: medium
22%
0.0 In
13:00

NW
NW

6 / 9 mph 63 / 63°F 89% 1012 mb
Low level cloud: 83%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
19:00

SW
SW

2 / 3 mph 68 / 68°F 91% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.1 In
Wed 24
Sep
01:00

NW
NW

4 / 5 mph 55 / 55°F 95% 1017 mb
Low level cloud: 81%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
07:00

SE
SE

1 / 2 mph 63 / 63°F 94% 1024 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
13:00

W
W

2 / 3 mph 60 / 60°F 83% 1018 mb
Low level cloud: 25%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SSE
SSE

2 / 4 mph 71 / 71°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
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