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Hamilton 14 Day Long Range Forecast

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

Missouri, United States Of America

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

The next 14 day outlook for Hamilton shows the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 30°C expected on the afternoon of Tuesday 21st. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Thursday 23rd at 8°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Current predictions suggest Sunday 26th will have the most precipitation with an accumulation of around 46.0mm. On the whole winds are likely to be moderate.

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

S
S

5 / 10 mph 61 / 61°F 84% 1009 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

4 / 9 mph 60 / 60°F 90% 1008 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
06:00

SW
SW

3 / 7 mph 63 / 61°F 92% 1008 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

2 / 2 mph 75 / 76°F 73% 1008 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

4 / 5 mph 80 / 78°F 54% 1007 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

4 / 6 mph 80 / 79°F 57% 1006 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

9 / 15 mph 75 / 76°F 78% 1006 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

7 / 15 mph 66 / 66°F 86% 1007 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
Sat 18
May
15:00

SW
SW

9 / 12 mph 83 / 84°F 60% 1009 mb
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

5 / 9 mph 82 / 83°F 75% 1010 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

6 / 13 mph 70 / 70°F 88% 1012 mb
Low level cloud: 36%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NE
NE

7 / 14 mph 66 / 66°F 92% 1013 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 10 mph 63 / 63°F 95% 1014 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

2 / 4 mph 68 / 65°F 95% 1014 mb
Low level cloud: 39%
Mid level cloud: 7%
High level cloud: 96%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

10 / 12 mph 75 / 77°F 80% 1013 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 15%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

10 / 12 mph 82 / 82°F 63% 1013 mb
Low level cloud: 36%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

11 / 14 mph 83 / 83°F 58% 1010 mb
Low level cloud: 8%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

7 / 13 mph 80 / 81°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

10 / 21 mph 72 / 72°F 86% 1009 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 99%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

SSW
SSW

19 / 33 mph 68 / 68°F 89% 1006 mb
Low level cloud: 3%
Mid level cloud: 56%
High level cloud: 12%
Most Significant Cloud Type: medium
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSW
SSW

4 / 7 mph 64 / 64°F 93% 1007 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 17%
Most Significant Cloud Type: low
25%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

S
S

4 / 7 mph 67 / 64°F 97% 1008 mb
Low level cloud: 55%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

8 / 10 mph 72 / 76°F 84% 1009 mb
Low level cloud: 69%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

12 / 13 mph 78 / 80°F 68% 1009 mb
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

9 / 13 mph 74 / 78°F 83% 1007 mb
Low level cloud: 87%
Mid level cloud: 83%
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

SSE
SSE

10 / 16 mph 80 / 81°F 81% 1005 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

7 / 15 mph 73 / 77°F 92% 1006 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

S
S

10 / 21 mph 70 / 70°F 88% 1004 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

13 / 22 mph 69 / 69°F 93% 1003 mb
Low level cloud: 25%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

17 / 28 mph 70 / 68°F 92% 1002 mb
Low level cloud: 18%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

22 / 28 mph 78 / 80°F 79% 1000 mb
Low level cloud: 52%
Mid level cloud: 5%
High level cloud: 92%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

21 / 25 mph 81 / 85°F 78% 1000 mb
Low level cloud: 42%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

18 / 23 mph 85 / 91°F 70% 999 mb
Low level cloud: 4%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

13 / 24 mph 79 / 80°F 77% 1000 mb
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

13 / 22 mph 63 / 63°F 81% 1004 mb
Low level cloud: 4%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNE
NNE

6 / 11 mph 56 / 55°F 90% 1005 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

6 / 12 mph 54 / 52°F 92% 1005 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

6 / 8 mph 58 / 55°F 91% 1005 mb
Low level cloud: 53%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

10 / 14 mph 57 / 54°F 92% 1005 mb
Low level cloud: 100%
Mid level cloud: 79%
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

NW
NW

12 / 18 mph 57 / 54°F 92% 1007 mb
Low level cloud: 56%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

15 / 19 mph 65 / 64°F 73% 1008 mb
Low level cloud: 73%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

15 / 22 mph 63 / 62°F 79% 1010 mb
Low level cloud: 59%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

12 / 20 mph 53 / 49°F 90% 1014 mb
Low level cloud: 38%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

NW
NW

9 / 15 mph 50 / 46°F 96% 1016 mb
Low level cloud: 26%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

8 / 15 mph 47 / 43°F 95% 1016 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

6 / 11 mph 49 / 45°F 92% 1018 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

8 / 9 mph 59 / 56°F 71% 1019 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 24%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

6 / 7 mph 66 / 63°F 62% 1019 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

4 / 6 mph 70 / 67°F 57% 1018 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

3 / 4 mph 69 / 66°F 68% 1017 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
21:00

SSE
SSE

4 / 8 mph 58 / 58°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
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

12 / 26 mph 66 / 66°F 97% 1013 mb
Low level cloud: 77%
Mid level cloud: 0%
High level cloud: 50%
Most Significant Cloud Type: low
82%
0.0 In
06:00

ENE
ENE

9 / 18 mph 64 / 64°F 96% 1006 mb
Low level cloud: 27%
Mid level cloud: 6%
High level cloud: 17%
Most Significant Cloud Type: low
31%
0.0 In
12:00

SSW
SSW

15 / 32 mph 81 / 87°F 73% 1000 mb
Low level cloud: 88%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
18:00

NW
NW

12 / 26 mph 70 / 70°F 75% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May
00:00

S
S

22 / 46 mph 75 / 79°F 82% 1000 mb
Low level cloud: 45%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
06:00

SE
SE

3 / 7 mph 65 / 65°F 98% 1004 mb
Low level cloud: 92%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

18 / 38 mph 82 / 87°F 76% 1004 mb
Low level cloud: 98%
Mid level cloud: 34%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

20 / 42 mph 76 / 80°F 84% 1005 mb
Low level cloud: 5%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
Sun 26
May
00:00

SW
SW

9 / 19 mph 69 / 69°F 93% 1006 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.2 In
06:00

S
S

9 / 19 mph 68 / 68°F 97% 1006 mb
Low level cloud: 93%
Mid level cloud: 74%
High level cloud: 15%
Most Significant Cloud Type: low
100%
1.7 In
12:00

NNW
NNW

3 / 6 mph 72 / 76°F 93% 1007 mb
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 43%
Most Significant Cloud Type: low
100%
0.3 In
18:00

NNE
NNE

7 / 15 mph 74 / 77°F 84% 1009 mb
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.3 In
Mon 27
May
00:00

NNE
NNE

9 / 20 mph 57 / 55°F 97% 1011 mb
Low level cloud: 99%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.6 In
06:00

NE
NE

7 / 14 mph 58 / 57°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 75%
Most Significant Cloud Type: medium
18%
0.0 In
12:00

NNE
NNE

10 / 21 mph 61 / 61°F 91% 1016 mb
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ENE
ENE

7 / 14 mph 71 / 71°F 75% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 28
May
00:00

NNE
NNE

8 / 16 mph 58 / 56°F 91% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.1 In
06:00

ENE
ENE

6 / 13 mph 60 / 60°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 58%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ENE
ENE

11 / 24 mph 64 / 64°F 70% 1020 mb
Low level cloud: 48%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
18:00

ENE
ENE

9 / 18 mph 69 / 69°F 80% 1015 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 22%
Most Significant Cloud Type: medium
38%
0.0 In
Wed 29
May
00:00

NNE
NNE

6 / 13 mph 54 / 53°F 95% 1023 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.1 In
06:00

NNW
NNW

10 / 21 mph 58 / 56°F 97% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.2 In
12:00

NE
NE

7 / 15 mph 68 / 68°F 61% 1023 mb
Low level cloud: 56%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
18:00

NNW
NNW

7 / 14 mph 63 / 63°F 81% 1018 mb
Low level cloud: 19%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.6 In
Thu 30
May
00:00

SE
SE

7 / 15 mph 55 / 54°F 89% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NW
NW

9 / 18 mph 54 / 52°F 93% 1018 mb
Low level cloud: 4%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
12:00

SSE
SSE

14 / 29 mph 70 / 70°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
18:00

NW
NW

6 / 13 mph 68 / 68°F 79% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 31
May
00:00

SSE
SSE

9 / 18 mph 59 / 57°F 90% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NNW
NNW

8 / 16 mph 54 / 52°F 95% 1018 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.1 In
12:00

SSE
SSE

15 / 31 mph 62 / 62°F 88% 1020 mb
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
51%
0.0 In
18:00

N
N

9 / 19 mph 63 / 63°F 70% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
Sat 01
Jun
00:00

SE
SE

16 / 34 mph 63 / 63°F 91% 1016 mb
Low level cloud: 4%
Mid level cloud: 34%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.1 In
06:00

N
N

6 / 14 mph 50 / 48°F 91% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

S
S

21 / 43 mph 74 / 78°F 72% 1014 mb
Low level cloud: 45%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.2 In
18:00

NE
NE

3 / 6 mph 67 / 67°F 66% 1024 mb
Low level cloud: 25%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
25%
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