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Marshall 14 Day Long Range Forecast

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

Missouri, United States Of America

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

The outlook for Marshall in the two weeks ahead shows the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 31°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 17°C, dipping to its lowest on the morning of Thursday 23rd at 9°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The current forecast indicates Saturday 25th will have the most precipitation with an accumulation of around 22.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
15:00

S
S

2 / 3 mph 82 / 80°F 55% 1006 mb
Low level cloud: 5%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

3 / 6 mph 76 / 77°F 74% 1006 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

6 / 13 mph 66 / 66°F 88% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

S
S

6 / 13 mph 64 / 64°F 92% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

6 / 13 mph 62 / 62°F 93% 1008 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
06:00

SSW
SSW

5 / 10 mph 64 / 62°F 93% 1010 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

8 / 9 mph 75 / 77°F 75% 1010 mb
Low level cloud: 1%
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
12:00

SW
SW

9 / 10 mph 81 / 81°F 61% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

7 / 9 mph 84 / 83°F 56% 1010 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

4 / 6 mph 83 / 85°F 72% 1011 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
21:00

SSW
SSW

5 / 11 mph 72 / 76°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

SSW
SSW

5 / 11 mph 69 / 69°F 86% 1013 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

3 / 5 mph 68 / 68°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

5 / 11 mph 68 / 66°F 90% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

6 / 7 mph 77 / 78°F 76% 1014 mb
Low level cloud: 3%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

9 / 11 mph 84 / 85°F 61% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

9 / 12 mph 87 / 87°F 53% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

6 / 10 mph 84 / 85°F 73% 1009 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

8 / 16 mph 72 / 76°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 45%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

SSW
SSW

20 / 35 mph 69 / 69°F 88% 1009 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 89%
Most Significant Cloud Type: medium
32%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

S
S

11 / 23 mph 66 / 66°F 91% 1007 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 64%
Most Significant Cloud Type: medium
10%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSW
SSW

15 / 23 mph 69 / 67°F 89% 1009 mb
Low level cloud: 21%
Mid level cloud: 10%
High level cloud: 42%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

6 / 8 mph 73 / 69°F 84% 1011 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
58%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSE
SSE

7 / 8 mph 79 / 79°F 67% 1010 mb
Low level cloud: 13%
Mid level cloud: 12%
High level cloud: 33%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

10 / 14 mph 83 / 85°F 66% 1007 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

6 / 10 mph 84 / 84°F 78% 1006 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

8 / 17 mph 73 / 77°F 91% 1006 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
Tue 21
May
00:00

SSE
SSE

10 / 21 mph 70 / 70°F 92% 1006 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
03:00

SSE
SSE

11 / 22 mph 69 / 69°F 91% 1005 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

14 / 25 mph 71 / 69°F 88% 1004 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

20 / 27 mph 79 / 82°F 74% 1002 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

22 / 26 mph 85 / 89°F 69% 1001 mb
Low level cloud: 44%
Mid level cloud: 10%
High level cloud: 72%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

22 / 27 mph 84 / 89°F 73% 1001 mb
Low level cloud: 13%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

16 / 25 mph 80 / 84°F 82% 999 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

9 / 17 mph 72 / 76°F 91% 1002 mb
Low level cloud: 8%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: low
13%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Wed 22
May
00:00

N
N

8 / 13 mph 62 / 62°F 92% 1005 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

7 / 13 mph 58 / 57°F 94% 1004 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

4 / 8 mph 61 / 59°F 93% 1004 mb
Low level cloud: 80%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

7 / 10 mph 62 / 61°F 93% 1004 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

14 / 19 mph 60 / 60°F 94% 1006 mb
Low level cloud: 100%
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
15:00

NW
NW

15 / 17 mph 65 / 65°F 78% 1008 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
18:00

WNW
WNW

11 / 17 mph 65 / 63°F 79% 1010 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

13 / 21 mph 57 / 55°F 89% 1013 mb
Low level cloud: 43%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WNW
WNW

8 / 13 mph 51 / 49°F 97% 1016 mb
Low level cloud: 44%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 10 mph 49 / 46°F 97% 1016 mb
Low level cloud: 45%
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
06:00

NW
NW

6 / 10 mph 50 / 47°F 94% 1017 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

7 / 8 mph 62 / 60°F 72% 1019 mb
Low level cloud: 27%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

8 / 9 mph 68 / 65°F 61% 1019 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

5 / 6 mph 68 / 66°F 60% 1018 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
18:00

NE
NE

2 / 3 mph 69 / 66°F 67% 1018 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
21:00

S
S

2 / 4 mph 60 / 60°F 80% 1020 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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
00:00

SSE
SSE

11 / 22 mph 65 / 65°F 96% 1014 mb
Low level cloud: 40%
Mid level cloud: 19%
High level cloud: 40%
Most Significant Cloud Type: low
51%
0.0 In
06:00

ESE
ESE

6 / 13 mph 67 / 67°F 98% 1006 mb
Low level cloud: 72%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

17 / 36 mph 80 / 85°F 76% 1001 mb
Low level cloud: 62%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
18:00

NW
NW

12 / 26 mph 75 / 80°F 90% 1007 mb
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
Sat 25
May
00:00

S
S

18 / 38 mph 76 / 79°F 70% 1003 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
06:00

SSW
SSW

14 / 29 mph 65 / 65°F 89% 1006 mb
Low level cloud: 48%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: low
53%
0.0 In
12:00

SSW
SSW

21 / 44 mph 84 / 90°F 69% 1006 mb
Low level cloud: 23%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: low
26%
0.0 In
18:00

S
S

15 / 32 mph 78 / 83°F 80% 1006 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 39%
Most Significant Cloud Type: medium
64%
0.0 In
Sun 26
May
00:00

SE
SE

12 / 25 mph 69 / 69°F 93% 1007 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 79%
Most Significant Cloud Type: medium
19%
0.5 In
06:00

SSW
SSW

12 / 26 mph 70 / 70°F 93% 1007 mb
Low level cloud: 84%
Mid level cloud: 48%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.8 In
12:00

SSW
SSW

12 / 26 mph 77 / 82°F 86% 1007 mb
Low level cloud: 85%
Mid level cloud: 75%
High level cloud: 58%
Most Significant Cloud Type: low
100%
0.4 In
18:00

W
W

7 / 15 mph 76 / 80°F 85% 1008 mb
Low level cloud: 29%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.1 In
Mon 27
May
00:00

NE
NE

7 / 14 mph 64 / 64°F 98% 1010 mb
Low level cloud: 73%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.6 In
06:00

ENE
ENE

10 / 20 mph 63 / 63°F 92% 1013 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
11%
0.4 In
12:00

NNE
NNE

13 / 27 mph 59 / 56°F 96% 1014 mb
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
18:00

ENE
ENE

7 / 16 mph 68 / 68°F 81% 1014 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.1 In
Tue 28
May
00:00

NNE
NNE

8 / 17 mph 60 / 60°F 95% 1017 mb
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NE
NE

7 / 15 mph 60 / 60°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 33%
Most Significant Cloud Type: medium
22%
0.0 In
12:00

NE
NE

11 / 23 mph 62 / 62°F 81% 1020 mb
Low level cloud: 63%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
18:00

ESE
ESE

11 / 23 mph 69 / 69°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
Wed 29
May
00:00

N
N

8 / 17 mph 56 / 54°F 96% 1022 mb
Low level cloud: 64%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.2 In
06:00

NNE
NNE

7 / 15 mph 57 / 55°F 94% 1017 mb
Low level cloud: 30%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.1 In
12:00

NE
NE

9 / 18 mph 68 / 69°F 57% 1023 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NNW
NNW

5 / 11 mph 63 / 64°F 82% 1017 mb
Low level cloud: 87%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.3 In
Thu 30
May
00:00

ESE
ESE

6 / 12 mph 56 / 55°F 86% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

W
W

7 / 15 mph 55 / 53°F 94% 1018 mb
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
12:00

SE
SE

13 / 28 mph 71 / 71°F 59% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

WNW
WNW

8 / 17 mph 68 / 68°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
Fri 31
May
00:00

SE
SE

9 / 18 mph 59 / 57°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NW
NW

6 / 13 mph 55 / 54°F 91% 1017 mb
Low level cloud: 4%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
0.0 In
12:00

SSE
SSE

14 / 29 mph 64 / 64°F 87% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.1 In
18:00

N
N

10 / 21 mph 64 / 64°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
Sat 01
Jun
00:00

SSE
SSE

11 / 23 mph 62 / 62°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 96%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

N
N

5 / 11 mph 51 / 50°F 92% 1025 mb
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

SSE
SSE

19 / 39 mph 73 / 77°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 1%
Most Significant Cloud Type: medium
31%
0.1 In
18:00

NNE
NNE

4 / 9 mph 67 / 67°F 69% 1024 mb
Low level cloud: 11%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
12%
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