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Grayling 14 Day Long Range Forecast

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

Michigan, United States Of America

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

The forecast for Grayling in the coming two weeks is predicting the average daytime maximum temperature will be around -1°C, with a high for the two weeks of 8°C expected on the afternoon of Thursday 26th. The mean minimum temperature will be -8°C, dipping to its lowest on the morning of Wednesday 18th at -15°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain or snow. The current forecast indicates Sunday 22nd 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
Wed 18
Mar
16:00

SSW
SSW

11 / 13 mph 30 / 21°F 90% 1016 mb
Low level cloud: 88%
Mid level cloud: 47%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

8 / 11 mph 29 / 22°F 96% 1017 mb
Low level cloud: 99%
Mid level cloud: 91%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

7 / 10 mph 28 / 21°F 95% 1016 mb
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 32%
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

SW
SW

5 / 9 mph 25 / 19°F 97% 1016 mb
Low level cloud: 99%
Mid level cloud: 33%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

7 / 11 mph 31 / 24°F 98% 1016 mb
Low level cloud: 99%
Mid level cloud: 15%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

5 / 8 mph 32 / 27°F 97% 1018 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

6 / 8 mph 33 / 28°F 100% 1020 mb
Low level cloud: 99%
Mid level cloud: 5%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

4 / 5 mph 34 / 31°F 100% 1021 mb
Low level cloud: 79%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

2 / 3 mph 34 / 33°F 99% 1021 mb
Low level cloud: 93%
Mid level cloud: 44%
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

SSE
SSE

2 / 5 mph 28 / 26°F 96% 1021 mb
Low level cloud: 70%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

4 / 9 mph 26 / 20°F 99% 1020 mb
Low level cloud: 81%
Mid level cloud: 6%
High level cloud: 27%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 20
Mar
01:00

SSE
SSE

7 / 11 mph 32 / 26°F 98% 1016 mb
Low level cloud: 100%
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
04:00

S
S

6 / 11 mph 33 / 27°F 100% 1013 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

1 / 1 mph 33 / 33°F 100% 1010 mb
Low level cloud: 100%
Mid level cloud: 86%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

NW
NW

5 / 8 mph 34 / 30°F 100% 1010 mb
Low level cloud: 97%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
13:00

N
N

6 / 9 mph 36 / 30°F 100% 1010 mb
Low level cloud: 94%
Mid level cloud: 44%
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

NNE
NNE

6 / 9 mph 34 / 28°F 99% 1011 mb
Low level cloud: 88%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

6 / 9 mph 33 / 28°F 94% 1014 mb
Low level cloud: 84%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

4 / 5 mph 31 / 28°F 96% 1015 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Mar
01:00

ESE
ESE

1 / 2 mph 32 / 32°F 92% 1016 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

4 / 6 mph 31 / 26°F 97% 1015 mb
Low level cloud: 95%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

4 / 6 mph 31 / 26°F 95% 1014 mb
Low level cloud: 85%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

6 / 9 mph 33 / 28°F 99% 1014 mb
Low level cloud: 97%
Mid level cloud: 22%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

6 / 8 mph 36 / 30°F 100% 1012 mb
Low level cloud: 96%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

6 / 9 mph 36 / 31°F 100% 1009 mb
Low level cloud: 99%
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
19:00

ESE
ESE

1 / 2 mph 35 / 35°F 100% 1009 mb
Low level cloud: 96%
Mid level cloud: 85%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

2 / 5 mph 33 / 31°F 100% 1010 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Mar
01:00

NNE
NNE

5 / 9 mph 33 / 29°F 100% 1011 mb
Low level cloud: 99%
Mid level cloud: 79%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

7 / 11 mph 33 / 26°F 98% 1012 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

10 / 14 mph 32 / 23°F 97% 1014 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

12 / 16 mph 28 / 17°F 95% 1017 mb
Low level cloud: 82%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

ENE
ENE

12 / 16 mph 23 / 11°F 94% 1017 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

NE
NE

11 / 15 mph 23 / 12°F 94% 1018 mb
Low level cloud: 79%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

NE
NE

11 / 15 mph 22 / 11°F 94% 1020 mb
Low level cloud: 73%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
22:00

NE
NE

9 / 13 mph 22 / 12°F 92% 1021 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 0%
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

9 / 13 mph 21 / 11°F 93% 1023 mb
Low level cloud: 100%
Mid level cloud: 82%
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

NNE
NNE

6 / 10 mph 18 / 9°F 95% 1025 mb
Low level cloud: 90%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

5 / 9 mph 13 / 5°F 97% 1028 mb
Low level cloud: 79%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

6 / 8 mph 21 / 13°F 84% 1030 mb
Low level cloud: 62%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

8 / 9 mph 27 / 19°F 75% 1029 mb
Low level cloud: 100%
Mid level cloud: 4%
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

10 / 11 mph 26 / 17°F 75% 1030 mb
Low level cloud: 90%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

4 / 8 mph 17 / 11°F 93% 1032 mb
Low level cloud: 14%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

2 / 5 mph 9 / 5°F 99% 1034 mb
Low level cloud: 23%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 24
Mar
01:00

SW
SW

1 / 2 mph 7 / 7°F 99% 1034 mb
Low level cloud: 15%
Mid level cloud: 2%
High level cloud: 8%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

3 / 6 mph 5 / -1°F 99% 1033 mb
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 64%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

5 / 10 mph 14 / 6°F 97% 1032 mb
Low level cloud: 19%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

9 / 11 mph 25 / 15°F 84% 1030 mb
Low level cloud: 3%
Mid level cloud: 97%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

11 / 13 mph 31 / 22°F 85% 1027 mb
Low level cloud: 3%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

10 / 13 mph 33 / 25°F 89% 1025 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

7 / 13 mph 28 / 21°F 89% 1025 mb
Low level cloud: 19%
Mid level cloud: 19%
High level cloud: 72%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

5 / 10 mph 27 / 21°F 91% 1026 mb
Low level cloud: 41%
Mid level cloud: 58%
High level cloud: 38%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 25
Mar
01:00

E
E

5 / 7 mph 30 / 24°F 92% 1020 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
79%
0.0 In
07:00

E
E

11 / 15 mph 30 / 21°F 77% 1026 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 52%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

ESE
ESE

12 / 17 mph 32 / 23°F 77% 1017 mb
Low level cloud: 74%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.0 In
19:00

ESE
ESE

12 / 16 mph 26 / 16°F 67% 1031 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
Thu 26
Mar
01:00

SSE
SSE

13 / 19 mph 32 / 23°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
07:00

SE
SE

14 / 25 mph 36 / 27°F 99% 1001 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

13 / 19 mph 41 / 33°F 96% 1000 mb
Low level cloud: 100%
Mid level cloud: 59%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NW
NW

13 / 19 mph 35 / 26°F 98% 1001 mb
Low level cloud: 98%
Mid level cloud: 69%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
Fri 27
Mar
01:00

N
N

13 / 17 mph 16 / 2°F 79% 1022 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
07:00

N
N

12 / 16 mph 7 / -9°F 87% 1025 mb
Low level cloud: 100%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

NW
NW

10 / 14 mph 21 / 10°F 41% 1033 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

NNW
NNW

9 / 12 mph 11 / -2°F 79% 1034 mb
Low level cloud: 57%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
Sat 28
Mar
01:00

SSW
SSW

7 / 10 mph 22 / 14°F 56% 1031 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
07:00

S
S

4 / 6 mph 12 / 4°F 90% 1031 mb
Low level cloud: 85%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WNW
WNW

15 / 21 mph 34 / 24°F 55% 1023 mb
Low level cloud: 59%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
19:00

NNW
NNW

9 / 13 mph 18 / 8°F 80% 1026 mb
Low level cloud: 31%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.1 In
Sun 29
Mar
01:00

NNW
NNW

11 / 16 mph 21 / 9°F 71% 1035 mb
Low level cloud: 89%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
07:00

NNW
NNW

10 / 15 mph 10 / -4°F 90% 1031 mb
Low level cloud: 95%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

4 / 6 mph 30 / 25°F 33% 1041 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
19:00

NNW
NNW

9 / 13 mph 15 / 4°F 77% 1034 mb
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
Mon 30
Mar
01:00

SSE
SSE

8 / 11 mph 25 / 17°F 59% 1040 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 34%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

W
W

3 / 4 mph 9 / 4°F 85% 1038 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

S
S

13 / 19 mph 37 / 29°F 33% 1033 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 78%
Most Significant Cloud Type: medium
87%
0.0 In
19:00

NNW
NNW

2 / 4 mph 23 / 20°F 88% 1035 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
Tue 31
Mar
01:00

SSE
SSE

12 / 19 mph 32 / 23°F 63% 1025 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: medium
16%
0.0 In
07:00

SE
SE

8 / 13 mph 19 / 9°F 80% 1036 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: high
98%
0.0 In
13:00

SSE
SSE

12 / 19 mph 38 / 31°F 98% 1011 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SE
SE

14 / 21 mph 30 / 20°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 52%
High level cloud: 9%
Most Significant Cloud Type: medium
51%
0.0 In
Wed 01
Apr
01:00

SW
SW

7 / 15 mph 33 / 27°F 94% 1008 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
4%
0.3 In
07:00

SE
SE

15 / 23 mph 35 / 25°F 98% 1012 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
13:00

WNW
WNW

12 / 18 mph 41 / 34°F 78% 1006 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
19:00

S
S

7 / 12 mph 36 / 31°F 99% 1005 mb
Low level cloud: 97%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Thu 02
Apr
01:00

NW
NW

11 / 17 mph 34 / 26°F 93% 1013 mb
Low level cloud: 100%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SW
SW

6 / 8 mph 33 / 28°F 98% 1007 mb
Low level cloud: 98%
Mid level cloud: 47%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNE
NNE

8 / 12 mph 44 / 40°F 60% 1020 mb
Low level cloud: 100%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNW
NNW

2 / 3 mph 35 / 35°F 100% 1013 mb
Low level cloud: 94%
Mid level cloud: 51%
High level cloud: 67%
Most Significant Cloud Type: low
100%
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