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Hudson 14 Day Long Range Forecast

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

Michigan, United States Of America

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

Taking a look at Hudson over the coming two weeks and the average daytime maximum temperature will be around 3°C, with a high for the two weeks of 15°C expected on the morning of Friday 26th. The average minimum temperature will be -2°C, dipping to its lowest on the morning of Tuesday 16th at -10°C. The next 14 days will have some days seeing a little precipitation and some days with rain or snow. Predictions are Thursday 18th will have the most precipitation with an accumulation of around 16.0mm. On the whole winds are likely to be moderate.

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

SSW
SSW

13 / 21 mph 30 / 20°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

16 / 27 mph 29 / 17°F 87% 1013 mb
Low level cloud: 16%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

16 / 27 mph 30 / 18°F 89% 1012 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec
01:00

SW
SW

17 / 33 mph 31 / 19°F 89% 1010 mb
Low level cloud: 33%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

18 / 38 mph 29 / 17°F 90% 1009 mb
Low level cloud: 54%
Mid level cloud: 43%
High level cloud: 98%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

15 / 32 mph 29 / 18°F 93% 1011 mb
Low level cloud: 95%
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
10:00

WNW
WNW

15 / 28 mph 33 / 22°F 90% 1015 mb
Low level cloud: 93%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

10 / 15 mph 36 / 29°F 91% 1016 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

2 / 3 mph 37 / 35°F 96% 1018 mb
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

6 / 9 mph 34 / 29°F 98% 1019 mb
Low level cloud: 72%
Mid level cloud: 0%
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

SSE
SSE

9 / 15 mph 32 / 24°F 96% 1017 mb
Low level cloud: 26%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec
01:00

S
S

12 / 20 mph 30 / 21°F 98% 1015 mb
Low level cloud: 99%
Mid level cloud: 2%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

14 / 23 mph 34 / 25°F 97% 1012 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

17 / 28 mph 38 / 28°F 96% 1008 mb
Low level cloud: 100%
Mid level cloud: 54%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

18 / 30 mph 41 / 32°F 93% 1006 mb
Low level cloud: 90%
Mid level cloud: 80%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

19 / 32 mph 43 / 34°F 87% 1002 mb
Low level cloud: 83%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

S
S

23 / 38 mph 47 / 39°F 89% 997 mb
Low level cloud: 100%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

WSW
WSW

23 / 35 mph 47 / 39°F 93% 996 mb
Low level cloud: 81%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

WSW
WSW

14 / 22 mph 36 / 28°F 91% 998 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 19
Dec
01:00

SW
SW

11 / 17 mph 34 / 26°F 95% 997 mb
Low level cloud: 71%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

19 / 28 mph 30 / 17°F 74% 999 mb
Low level cloud: 9%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

21 / 29 mph 26 / 12°F 81% 1001 mb
Low level cloud: 71%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

19 / 24 mph 25 / 11°F 78% 1006 mb
Low level cloud: 71%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

22 / 26 mph 27 / 12°F 66% 1009 mb
Low level cloud: 53%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

19 / 25 mph 25 / 12°F 70% 1013 mb
Low level cloud: 69%
Mid level cloud: 0%
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

WNW
WNW

14 / 20 mph 23 / 11°F 72% 1017 mb
Low level cloud: 56%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

9 / 13 mph 24 / 14°F 71% 1019 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec
01:00

SW
SW

4 / 6 mph 25 / 19°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

8 / 11 mph 25 / 16°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 42%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

11 / 17 mph 26 / 15°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

16 / 22 mph 30 / 19°F 64% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

19 / 27 mph 36 / 26°F 57% 1008 mb
Low level cloud: 0%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

17 / 27 mph 38 / 28°F 59% 1007 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

13 / 23 mph 36 / 27°F 70% 1009 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

11 / 18 mph 33 / 24°F 81% 1011 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec
01:00

W
W

11 / 18 mph 30 / 21°F 89% 1014 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

13 / 21 mph 30 / 20°F 76% 1015 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
07:00

WSW
WSW

16 / 26 mph 30 / 19°F 69% 1016 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

WNW
WNW

21 / 28 mph 31 / 18°F 76% 1019 mb
Low level cloud: 79%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

21 / 24 mph 27 / 13°F 53% 1022 mb
Low level cloud: 53%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

18 / 23 mph 24 / 10°F 56% 1025 mb
Low level cloud: 96%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

15 / 21 mph 20 / 6°F 60% 1029 mb
Low level cloud: 70%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

13 / 18 mph 19 / 6°F 59% 1033 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
Mon 22
Dec
01:00

NW
NW

9 / 12 mph 19 / 8°F 60% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

7 / 10 mph 19 / 10°F 68% 1037 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 30%
Most Significant Cloud Type: high
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

6 / 8 mph 19 / 11°F 72% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

5 / 6 mph 21 / 15°F 64% 1040 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
13:00

ESE
ESE

5 / 6 mph 26 / 20°F 52% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

7 / 9 mph 27 / 19°F 49% 1037 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
19:00

SSE
SSE

8 / 11 mph 25 / 17°F 58% 1036 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

9 / 15 mph 24 / 15°F 59% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 23
Dec
01:00

SSW
SSW

12 / 21 mph 34 / 25°F 72% 1017 mb
Low level cloud: 85%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SW
SW

10 / 19 mph 34 / 27°F 93% 1017 mb
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WNW
WNW

21 / 25 mph 24 / 9°F 73% 1023 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
19:00

SW
SW

8 / 17 mph 39 / 33°F 99% 1013 mb
Low level cloud: 97%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
Wed 24
Dec
01:00

WSW
WSW

11 / 23 mph 41 / 35°F 98% 1014 mb
Low level cloud: 100%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

8 / 13 mph 42 / 37°F 93% 1017 mb
Low level cloud: 86%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
13:00

ESE
ESE

8 / 11 mph 38 / 32°F 91% 1021 mb
Low level cloud: 95%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

E
E

6 / 11 mph 34 / 29°F 97% 1019 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
Thu 25
Dec
01:00

SSW
SSW

10 / 21 mph 46 / 41°F 99% 1011 mb
Low level cloud: 100%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.1 In
07:00

ENE
ENE

4 / 7 mph 37 / 34°F 98% 1019 mb
Low level cloud: 94%
Mid level cloud: 5%
High level cloud: 30%
Most Significant Cloud Type: low
99%
0.0 In
13:00

WSW
WSW

17 / 25 mph 59 / 56°F 82% 1007 mb
Low level cloud: 51%
Mid level cloud: 2%
High level cloud: 42%
Most Significant Cloud Type: low
56%
0.0 In
19:00

ESE
ESE

8 / 17 mph 38 / 33°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 56%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
Fri 26
Dec
01:00

NNW
NNW

9 / 13 mph 38 / 31°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
07:00

WSW
WSW

18 / 31 mph 59 / 55°F 86% 1005 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
48%
0.1 In
13:00

WSW
WSW

13 / 16 mph 41 / 34°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
19:00

WNW
WNW

11 / 17 mph 45 / 39°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: high
33%
0.0 In
Sat 27
Dec
01:00

NW
NW

19 / 29 mph 31 / 19°F 72% 1021 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
07:00

E
E

8 / 13 mph 35 / 28°F 88% 1015 mb
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
28%
0.0 In
13:00

W
W

12 / 15 mph 35 / 27°F 47% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SE
SE

6 / 12 mph 39 / 34°F 99% 999 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
Sun 28
Dec
01:00

WSW
WSW

16 / 25 mph 34 / 24°F 49% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

W
W

21 / 33 mph 32 / 20°F 74% 1009 mb
Low level cloud: 64%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.1 In
13:00

SW
SW

10 / 15 mph 33 / 25°F 98% 1007 mb
Low level cloud: 98%
Mid level cloud: 89%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.3 In
19:00

NW
NW

12 / 19 mph 37 / 29°F 74% 1017 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
0.0 In
Mon 29
Dec
01:00

ENE
ENE

9 / 16 mph 29 / 21°F 97% 1013 mb
Low level cloud: 99%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

7 / 12 mph 26 / 18°F 67% 1022 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
13:00

E
E

12 / 15 mph 34 / 26°F 89% 1016 mb
Low level cloud: 99%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SE
SE

5 / 9 mph 32 / 26°F 55% 1022 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 69%
Most Significant Cloud Type: medium
46%
0.0 In
Tue 30
Dec
01:00

NE
NE

11 / 16 mph 30 / 21°F 92% 1012 mb
Low level cloud: 88%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSW
SSW

12 / 20 mph 32 / 23°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
0.0 In
13:00

NE
NE

7 / 9 mph 34 / 28°F 83% 1011 mb
Low level cloud: 33%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
19:00

NW
NW

14 / 22 mph 35 / 25°F 83% 1015 mb
Low level cloud: 12%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
15%
0.0 In
Wed 31
Dec
01:00

SSW
SSW

2 / 4 mph 32 / 30°F 91% 1011 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNE
NNE

9 / 14 mph 26 / 17°F 69% 1027 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
50%
0.0 In
13:00

NW
NW

15 / 19 mph 32 / 22°F 85% 1014 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

E
E

12 / 19 mph 27 / 17°F 76% 1027 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
13%
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