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Willow Run 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Willow Run

Michigan, United States Of America

Long range weather outlook for Willow Run includes 14 day forecast summary:

Reviewing the forecast for Willow Run Over the next 14 days and the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 25°C expected on the afternoon of Sunday 22nd. The average minimum temperature will be 1°C, dipping to its lowest on the morning of Wednesday 18th at -6°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain or snow. Current predictions suggest Thursday 26th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 17
Mar		01:00

WNW
WNW

 19 / 25 mph 21 / 6°F 59% 1008 mb
Low level cloud: 68%
Mid level cloud: 89%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 18 / 21 mph 19 / 4°F 56% 1011 mb
Low level cloud: 14%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 15 / 17 mph 19 / 6°F 56% 1015 mb
Low level cloud: 22%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 14 / 16 mph 23 / 11°F 46% 1017 mb
Low level cloud: 45%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 13 / 15 mph 27 / 16°F 38% 1019 mb
Low level cloud: 2%
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
16:00

WNW
WNW

 14 / 16 mph 26 / 14°F 42% 1021 mb
Low level cloud: 19%
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

W
W

 8 / 10 mph 26 / 17°F 44% 1023 mb
Low level cloud: 1%
Mid level cloud: 48%
High level cloud: 20%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 9 / 10 mph 25 / 15°F 50% 1025 mb
Low level cloud: 10%
Mid level cloud: 46%
High level cloud: 90%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 18
Mar		19:00

S
S

 10 / 14 mph 32 / 24°F 97% 1019 mb
Low level cloud: 99%
Mid level cloud: 56%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 8 / 12 mph 33 / 26°F 97% 1019 mb
Low level cloud: 78%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 19
Mar		01:00

SSW
SSW

 6 / 11 mph 32 / 26°F 95% 1017 mb
Low level cloud: 36%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 6 / 12 mph 31 / 25°F 94% 1018 mb
Low level cloud: 67%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 3 / 5 mph 33 / 30°F 92% 1018 mb
Low level cloud: 84%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 6 / 8 mph 36 / 31°F 88% 1020 mb
Low level cloud: 93%
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
13:00

WNW
WNW

 7 / 9 mph 42 / 37°F 77% 1020 mb
Low level cloud: 95%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 8 / 11 mph 43 / 38°F 73% 1020 mb
Low level cloud: 99%
Mid level cloud: 22%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 4 / 7 mph 41 / 38°F 78% 1021 mb
Low level cloud: 90%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 2 / 2 mph 40 / 40°F 83% 1022 mb
Low level cloud: 74%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 20
Mar		01:00

S
S

 6 / 13 mph 38 / 32°F 89% 1020 mb
Low level cloud: 37%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 7 / 15 mph 37 / 31°F 94% 1017 mb
Low level cloud: 19%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 11 / 19 mph 40 / 33°F 95% 1014 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 17 / 22 mph 49 / 43°F 80% 1012 mb
Low level cloud: 18%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 13 / 18 mph 54 / 50°F 79% 1010 mb
Low level cloud: 94%
Mid level cloud: 78%
High level cloud: 55%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 5 / 10 mph 55 / 54°F 86% 1007 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 5 / 8 mph 49 / 47°F 96% 1009 mb
Low level cloud: 93%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 6 / 8 mph 46 / 42°F 97% 1010 mb
Low level cloud: 99%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Mar		01:00

N
N

 8 / 9 mph 43 / 39°F 93% 1012 mb
Low level cloud: 93%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 6 / 8 mph 39 / 35°F 92% 1012 mb
Low level cloud: 51%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 4 / 6 mph 37 / 33°F 95% 1013 mb
Low level cloud: 85%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 1 / 1 mph 43 / 43°F 80% 1014 mb
Low level cloud: 76%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 7 / 8 mph 55 / 51°F 61% 1011 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 10 / 12 mph 60 / 59°F 56% 1008 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 42%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 14 mph 52 / 49°F 82% 1007 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 6 / 12 mph 49 / 47°F 86% 1007 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Mar		01:00

SW
SW

 8 / 17 mph 49 / 46°F 85% 1006 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 8 / 17 mph 49 / 46°F 89% 1005 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 7 / 14 mph 50 / 47°F 91% 1005 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 10 / 12 mph 62 / 61°F 71% 1004 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 20 / 23 mph 74 / 76°F 50% 1000 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 19 / 27 mph 77 / 78°F 47% 998 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 18 / 20 mph 48 / 41°F 76% 1005 mb
Low level cloud: 37%
Mid level cloud: 75%
High level cloud: 17%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 17 / 19 mph 39 / 30°F 73% 1011 mb
Low level cloud: 85%
Mid level cloud: 40%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 23
Mar		01:00

NNE
NNE

 17 / 21 mph 34 / 24°F 74% 1016 mb
Low level cloud: 100%
Mid level cloud: 6%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 15 / 20 mph 32 / 22°F 70% 1019 mb
Low level cloud: 100%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 14 / 19 mph 31 / 20°F 66% 1023 mb
Low level cloud: 100%
Mid level cloud: 2%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 13 / 15 mph 35 / 25°F 52% 1025 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 12 / 13 mph 40 / 33°F 42% 1026 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 11 / 13 mph 42 / 35°F 34% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 11 / 13 mph 39 / 32°F 39% 1029 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
22:00

NNE
NNE

 10 / 13 mph 30 / 21°F 43% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 85%
Most Significant Cloud Type: high
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 24
Mar		01:00

ENE
ENE

 6 / 8 mph 34 / 29°F 59% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 7 / 10 mph 29 / 22°F 57% 1035 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

ESE
ESE

 17 / 22 mph 37 / 27°F 32% 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

SSE
SSE

 18 / 25 mph 41 / 33°F 88% 1020 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Wed 25
Mar		01:00

SSE
SSE

 9 / 12 mph 39 / 33°F 98% 1018 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 68%
Most Significant Cloud Type: low
100%
0.0 In
07:00

E
E

 11 / 17 mph 35 / 27°F 49% 1025 mb
Low level cloud: 0%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
98%
0.0 In
13:00

SE
SE

 13 / 17 mph 42 / 35°F 65% 1016 mb
Low level cloud: 93%
Mid level cloud: 82%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
19:00

E
E

 10 / 13 mph 40 / 33°F 44% 1031 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
Thu 26
Mar		01:00

SE
SE

 14 / 24 mph 38 / 29°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

SE
SE

 12 / 19 mph 38 / 30°F 74% 1014 mb
Low level cloud: 52%
Mid level cloud: 96%
High level cloud: 70%
Most Significant Cloud Type: low
94%
0.0 In
13:00

SSW
SSW

 23 / 35 mph 50 / 43°F 90% 1005 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 78%
Most Significant Cloud Type: low
100%
0.4 In
19:00

NNW
NNW

 11 / 16 mph 49 / 44°F 92% 1007 mb
Low level cloud: 66%
Mid level cloud: 100%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.5 In
Fri 27
Mar		01:00

W
W

 14 / 25 mph 45 / 38°F 71% 1009 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.3 In
07:00

NW
NW

 5 / 7 mph 35 / 31°F 100% 1021 mb
Low level cloud: 95%
Mid level cloud: 55%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.6 In
13:00

WNW
WNW

 21 / 28 mph 36 / 25°F 47% 1016 mb
Low level cloud: 12%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

NNW
NNW

 11 / 16 mph 35 / 27°F 73% 1030 mb
Low level cloud: 78%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: low
83%
0.1 In
Sat 28
Mar		01:00

NW
NW

 15 / 21 mph 24 / 11°F 48% 1025 mb
Low level cloud: 33%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
07:00

NNE
NNE

 2 / 3 mph 33 / 31°F 65% 1037 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

 14 / 20 mph 29 / 18°F 29% 1027 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SW
SW

 6 / 9 mph 37 / 32°F 58% 1033 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Sun 29
Mar		01:00

W
W

 4 / 6 mph 27 / 22°F 46% 1028 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
46%
0.0 In
07:00

SW
SW

 10 / 15 mph 33 / 25°F 56% 1034 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
13:00

NW
NW

 14 / 20 mph 27 / 15°F 24% 1031 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

WSW
WSW

 8 / 12 mph 45 / 41°F 65% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 30
Mar		01:00

ESE
ESE

 4 / 5 mph 31 / 27°F 29% 1034 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
07:00

SW
SW

 7 / 14 mph 38 / 32°F 67% 1032 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 82%
Most Significant Cloud Type: medium
51%
0.0 In
13:00

SE
SE

 15 / 22 mph 32 / 22°F 32% 1028 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SE
SE

 16 / 24 mph 43 / 36°F 82% 1017 mb
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Tue 31
Mar		01:00

SSE
SSE

 15 / 22 mph 31 / 20°F 98% 1013 mb
Low level cloud: 93%
Mid level cloud: 99%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.2 In
07:00

WSW
WSW

 22 / 36 mph 58 / 54°F 90% 994 mb
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.8 In
13:00

WSW
WSW

 15 / 22 mph 35 / 26°F 99% 1008 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.4 In
19:00

NW
NW

 19 / 33 mph 35 / 25°F 72% 1017 mb
Low level cloud: 19%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: low
19%
0.1 In
Wed 01
Apr		01:00

W
W

 14 / 21 mph 32 / 22°F 87% 1016 mb
Low level cloud: 89%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
07:00

NW
NW

 10 / 18 mph 30 / 21°F 75% 1022 mb
Low level cloud: 68%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
13:00

NW
NW

 11 / 16 mph 39 / 32°F 62% 1022 mb
Low level cloud: 99%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
19:00

NW
NW

 7 / 13 mph 39 / 34°F 53% 1022 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: medium
43%
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