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Savannah 14 Day Long Range Forecast

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

Missouri, United States Of America

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

Over the next 14 days the Savannah forecast suggests 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 Saturday 18th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Thursday 23rd at 8°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 25th will have the most precipitation with an accumulation of around 29.0mm. 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

6 / 12 mph 64 / 64°F 81% 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
03:00

S
S

5 / 11 mph 60 / 60°F 89% 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 60 / 60°F 87% 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
09:00

S
S

4 / 5 mph 73 / 76°F 67% 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
12:00

SSE
SSE

5 / 6 mph 78 / 77°F 50% 1007 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

7 / 9 mph 80 / 78°F 49% 1006 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

7 / 11 mph 77 / 78°F 70% 1005 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
21:00

SSE
SSE

8 / 17 mph 67 / 67°F 88% 1006 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
Sat 18
May
15:00

WSW
WSW

9 / 11 mph 86 / 85°F 55% 1009 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

8 / 14 mph 81 / 81°F 70% 1010 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 16 mph 69 / 69°F 85% 1012 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NE
NE

7 / 13 mph 65 / 65°F 91% 1013 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 13 mph 61 / 61°F 91% 1014 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

7 / 12 mph 65 / 62°F 94% 1014 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

6 / 7 mph 73 / 76°F 83% 1013 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

10 / 12 mph 81 / 82°F 65% 1012 mb
Low level cloud: 53%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

12 / 17 mph 82 / 83°F 61% 1009 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 15%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

9 / 15 mph 80 / 80°F 74% 1008 mb
Low level cloud: 0%
Mid level cloud: 57%
High level cloud: 12%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

13 / 24 mph 72 / 76°F 82% 1007 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 96%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

SSW
SSW

16 / 26 mph 63 / 64°F 91% 1006 mb
Low level cloud: 46%
Mid level cloud: 5%
High level cloud: 60%
Most Significant Cloud Type: low
55%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

S
S

2 / 3 mph 63 / 64°F 94% 1006 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 55%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

5 / 9 mph 66 / 63°F 95% 1008 mb
Low level cloud: 28%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

10 / 14 mph 72 / 76°F 80% 1009 mb
Low level cloud: 23%
Mid level cloud: 28%
High level cloud: 79%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

13 / 16 mph 76 / 79°F 70% 1008 mb
Low level cloud: 98%
Mid level cloud: 16%
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

SSE
SSE

7 / 11 mph 78 / 78°F 82% 1006 mb
Low level cloud: 41%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

10 / 15 mph 79 / 81°F 83% 1005 mb
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

8 / 16 mph 72 / 77°F 94% 1005 mb
Low level cloud: 20%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

SSE
SSE

11 / 22 mph 70 / 70°F 92% 1003 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSE
SSE

14 / 24 mph 68 / 69°F 91% 1002 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

20 / 33 mph 70 / 69°F 89% 1000 mb
Low level cloud: 26%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

20 / 28 mph 75 / 78°F 82% 1000 mb
Low level cloud: 95%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

21 / 26 mph 82 / 85°F 71% 998 mb
Low level cloud: 78%
Mid level cloud: 21%
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

SW
SW

18 / 25 mph 85 / 88°F 65% 998 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

16 / 23 mph 73 / 76°F 80% 1001 mb
Low level cloud: 6%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

13 / 22 mph 60 / 60°F 74% 1005 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNE
NNE

8 / 13 mph 56 / 55°F 83% 1005 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

6 / 11 mph 53 / 52°F 92% 1005 mb
Low level cloud: 7%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

6 / 10 mph 57 / 53°F 89% 1006 mb
Low level cloud: 31%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

10 / 15 mph 56 / 53°F 90% 1007 mb
Low level cloud: 43%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

12 / 17 mph 58 / 55°F 85% 1008 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

12 / 17 mph 64 / 62°F 72% 1009 mb
Low level cloud: 33%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

17 / 24 mph 58 / 54°F 81% 1012 mb
Low level cloud: 62%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

12 / 19 mph 51 / 47°F 88% 1015 mb
Low level cloud: 23%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

NW
NW

7 / 12 mph 49 / 46°F 95% 1017 mb
Low level cloud: 7%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

7 / 12 mph 48 / 45°F 95% 1016 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

5 / 8 mph 49 / 46°F 91% 1019 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

7 / 8 mph 60 / 57°F 68% 1019 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 61%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

6 / 7 mph 66 / 64°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

4 / 4 mph 70 / 68°F 52% 1018 mb
Low level cloud: 5%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

4 / 5 mph 70 / 68°F 64% 1017 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

SE
SE

6 / 12 mph 59 / 59°F 82% 1019 mb
Low level cloud: 2%
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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
00:00

SSE
SSE

14 / 30 mph 67 / 67°F 97% 1011 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
86%
0.0 In
06:00

ESE
ESE

8 / 16 mph 64 / 64°F 95% 1005 mb
Low level cloud: 40%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
52%
0.0 In
12:00

SSW
SSW

16 / 33 mph 81 / 86°F 72% 999 mb
Low level cloud: 95%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
18:00

NW
NW

11 / 22 mph 73 / 77°F 64% 1008 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

SSW
SSW

20 / 43 mph 73 / 77°F 87% 1001 mb
Low level cloud: 93%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

4 / 9 mph 62 / 62°F 94% 1005 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
0.0 In
12:00

SSW
SSW

16 / 34 mph 80 / 85°F 80% 1003 mb
Low level cloud: 76%
Mid level cloud: 29%
High level cloud: 19%
Most Significant Cloud Type: low
88%
0.0 In
18:00

SSW
SSW

17 / 36 mph 74 / 78°F 83% 1004 mb
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 90%
Most Significant Cloud Type: low
32%
0.0 In
Sun 26
May
00:00

W
W

2 / 5 mph 70 / 70°F 93% 1007 mb
Low level cloud: 11%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
15%
0.3 In
06:00

S
S

8 / 16 mph 67 / 67°F 98% 1005 mb
Low level cloud: 95%
Mid level cloud: 32%
High level cloud: 10%
Most Significant Cloud Type: low
100%
1.1 In
12:00

NNE
NNE

14 / 30 mph 64 / 64°F 96% 1008 mb
Low level cloud: 97%
Mid level cloud: 86%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.3 In
18:00

N
N

9 / 18 mph 71 / 71°F 74% 1009 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.1 In
Mon 27
May
00:00

NNE
NNE

9 / 20 mph 61 / 61°F 95% 1011 mb
Low level cloud: 53%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.2 In
06:00

NE
NE

5 / 10 mph 58 / 58°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 71%
Most Significant Cloud Type: medium
63%
0.0 In
12:00

NE
NE

10 / 22 mph 61 / 61°F 77% 1015 mb
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
18:00

ENE
ENE

6 / 13 mph 72 / 76°F 71% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 28
May
00:00

NE
NE

8 / 17 mph 56 / 53°F 91% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

ENE
ENE

7 / 14 mph 60 / 60°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 50%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

NE
NE

9 / 18 mph 60 / 60°F 75% 1021 mb
Low level cloud: 76%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
18:00

NE
NE

9 / 19 mph 69 / 69°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 36%
Most Significant Cloud Type: medium
32%
0.1 In
Wed 29
May
00:00

NNE
NNE

6 / 12 mph 51 / 49°F 96% 1024 mb
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.1 In
06:00

NE
NE

9 / 18 mph 58 / 56°F 98% 1018 mb
Low level cloud: 72%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.7 In
12:00

ENE
ENE

6 / 13 mph 67 / 67°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

4 / 8 mph 66 / 66°F 75% 1017 mb
Low level cloud: 18%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.1 In
Thu 30
May
00:00

SE
SE

8 / 17 mph 56 / 55°F 91% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NW
NW

9 / 18 mph 54 / 52°F 93% 1019 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
12:00

SSE
SSE

15 / 32 mph 70 / 70°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

WNW
WNW

6 / 14 mph 67 / 67°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
Fri 31
May
00:00

SSE
SSE

13 / 28 mph 61 / 61°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

NNW
NNW

6 / 12 mph 56 / 55°F 94% 1018 mb
Low level cloud: 25%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
12:00

SSE
SSE

19 / 39 mph 65 / 65°F 81% 1018 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: medium
13%
0.1 In
18:00

NNE
NNE

9 / 20 mph 64 / 64°F 66% 1020 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
Sat 01
Jun
00:00

SSE
SSE

17 / 37 mph 64 / 64°F 89% 1013 mb
Low level cloud: 7%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
0.2 In
06:00

N
N

5 / 11 mph 51 / 49°F 86% 1026 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

19 / 39 mph 73 / 77°F 77% 1013 mb
Low level cloud: 67%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.3 In
18:00

E
E

4 / 9 mph 69 / 69°F 65% 1024 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
18%
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