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Dalton 14 Day Long Range Forecast

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

Georgia, United States Of America

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

The next 14 day outlook for Dalton shows the average daytime maximum temperature will be around 28°C, with a high for the two weeks of 31°C expected on the afternoon of Sunday 26th. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Thursday 30th at 10°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Current predictions suggest Monday 27th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
01:00

ESE
ESE

2 / 5 mph 65 / 65°F 96% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

2 / 5 mph 62 / 62°F 97% 1013 mb
Low level cloud: 18%
Mid level cloud: 14%
High level cloud: 38%
Most Significant Cloud Type: low
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SE
SE

3 / 6 mph 69 / 66°F 96% 1013 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 52%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

11 / 14 mph 72 / 76°F 93% 1015 mb
Low level cloud: 22%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

2 / 2 mph 83 / 81°F 60% 1012 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 21%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

4 / 4 mph 89 / 88°F 47% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

2 / 5 mph 79 / 79°F 77% 1010 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
22:00

SSE
SSE

1 / 2 mph 67 / 67°F 91% 1012 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
16:00

SSW
SSW

9 / 18 mph 83 / 85°F 70% 1009 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

5 / 11 mph 77 / 77°F 90% 1010 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 4%
Most Significant Cloud Type: medium
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

7 / 15 mph 69 / 69°F 90% 1009 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
Mon 27
May
01:00

SSE
SSE

6 / 13 mph 66 / 66°F 91% 1009 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

4 / 9 mph 66 / 66°F 96% 1009 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 92%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

5 / 10 mph 69 / 69°F 98% 1010 mb
Low level cloud: 96%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
10:00

SSW
SSW

6 / 8 mph 76 / 78°F 95% 1011 mb
Low level cloud: 85%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

9 / 12 mph 87 / 89°F 63% 1010 mb
Low level cloud: 10%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

W
W

12 / 16 mph 85 / 86°F 58% 1011 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

4 / 7 mph 81 / 81°F 70% 1012 mb
Low level cloud: 0%
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
22:00

NNW
NNW

4 / 9 mph 68 / 68°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
01:00

N
N

2 / 5 mph 64 / 64°F 88% 1014 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
04:00

NNW
NNW

2 / 3 mph 60 / 60°F 94% 1015 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
07:00

N
N

3 / 4 mph 68 / 66°F 86% 1016 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

5 / 6 mph 81 / 80°F 55% 1016 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
13:00

WNW
WNW

9 / 11 mph 87 / 84°F 35% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

12 / 13 mph 85 / 83°F 38% 1015 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
19:00

WNW
WNW

5 / 11 mph 74 / 76°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

3 / 7 mph 66 / 66°F 80% 1017 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
Wed 29
May
01:00

NNW
NNW

3 / 6 mph 62 / 62°F 90% 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
04:00

N
N

5 / 11 mph 58 / 58°F 95% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

6 / 9 mph 65 / 63°F 82% 1020 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
10:00

NNW
NNW

8 / 9 mph 75 / 76°F 47% 1020 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
13:00

NW
NW

9 / 10 mph 82 / 79°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

9 / 11 mph 81 / 79°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 63%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

8 / 15 mph 69 / 67°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

8 / 15 mph 60 / 60°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
01:00

N
N

6 / 13 mph 55 / 53°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

5 / 11 mph 50 / 48°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

7 / 10 mph 56 / 53°F 80% 1020 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
10:00

N
N

8 / 9 mph 71 / 68°F 48% 1020 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
13:00

N
N

8 / 9 mph 78 / 77°F 37% 1018 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
16:00

N
N

9 / 11 mph 78 / 77°F 41% 1017 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
19:00

N
N

6 / 9 mph 72 / 69°F 69% 1017 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
22:00

N
N

7 / 15 mph 59 / 58°F 77% 1019 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
Fri 31
May
01:00

NNE
NNE

8 / 17 mph 54 / 52°F 78% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

3 / 6 mph 51 / 50°F 84% 1019 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
07:00

N
N

4 / 7 mph 58 / 57°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 92%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

4 / 4 mph 75 / 76°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 84%
Most Significant Cloud Type: high
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

6 / 6 mph 84 / 80°F 37% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

4 / 4 mph 86 / 82°F 33% 1019 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
19:00

E
E

3 / 6 mph 75 / 76°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

6 / 12 mph 62 / 62°F 68% 1021 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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun
01:00

SE
SE

5 / 11 mph 64 / 64°F 98% 1019 mb
Low level cloud: 48%
Mid level cloud: 27%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SE
SE

4 / 9 mph 60 / 60°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

SW
SW

2 / 5 mph 88 / 89°F 41% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

SSE
SSE

2 / 4 mph 76 / 78°F 61% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 02
Jun
01:00

SSE
SSE

3 / 6 mph 67 / 67°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
0.0 In
07:00

SSE
SSE

4 / 9 mph 62 / 62°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

SSE
SSE

6 / 13 mph 81 / 81°F 37% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 19%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

SE
SE

2 / 5 mph 73 / 77°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 76%
Most Significant Cloud Type: medium
34%
0.0 In
Mon 03
Jun
01:00

SSE
SSE

3 / 6 mph 69 / 69°F 63% 1021 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
07:00

SE
SE

4 / 9 mph 64 / 64°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
45%
0.0 In
13:00

SW
SW

2 / 3 mph 85 / 85°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
0.0 In
19:00

NE
NE

3 / 6 mph 74 / 77°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 59%
Most Significant Cloud Type: medium
31%
0.0 In
Tue 04
Jun
01:00

SSE
SSE

2 / 3 mph 68 / 68°F 71% 1021 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

SE
SE

2 / 4 mph 70 / 70°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 50%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

N
N

1 / 2 mph 90 / 91°F 39% 1020 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

ENE
ENE

3 / 6 mph 76 / 79°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
0.0 In
Wed 05
Jun
01:00

NNE
NNE

2 / 5 mph 66 / 66°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

E
E

2 / 3 mph 70 / 70°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 28%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

NW
NW

8 / 16 mph 85 / 85°F 40% 1017 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 38%
Most Significant Cloud Type: medium
23%
0.0 In
19:00

ESE
ESE

4 / 9 mph 77 / 79°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
Thu 06
Jun
01:00

NNW
NNW

2 / 5 mph 67 / 67°F 90% 1015 mb
Low level cloud: 25%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
07:00

E
E

2 / 4 mph 71 / 71°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

NNW
NNW

10 / 20 mph 89 / 89°F 38% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

ENE
ENE

4 / 9 mph 77 / 80°F 66% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 17%
Most Significant Cloud Type: medium
9%
0.0 In
Fri 07
Jun
01:00

N
N

4 / 9 mph 64 / 64°F 82% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

ESE
ESE

1 / 2 mph 72 / 76°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 62%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

NW
NW

6 / 12 mph 87 / 87°F 37% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

NW
NW

3 / 6 mph 79 / 83°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 29%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 08
Jun
01:00

S
S

4 / 8 mph 66 / 66°F 91% 1009 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 90%
Most Significant Cloud Type: medium
18%
0.0 In
07:00

NNW
NNW

2 / 4 mph 73 / 77°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: medium
14%
0.0 In
13:00

NW
NW

11 / 23 mph 82 / 86°F 65% 1005 mb
Low level cloud: 32%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.3 In
19:00

WNW
WNW

7 / 15 mph 77 / 80°F 63% 1012 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 29%
Most Significant Cloud Type: medium
17%
0.0 In
Sun 09
Jun
01:00

NNW
NNW

11 / 23 mph 63 / 63°F 82% 1005 mb
Low level cloud: 95%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NNW
NNW

4 / 9 mph 72 / 76°F 89% 1014 mb
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
13:00

N
N

16 / 33 mph 75 / 78°F 53% 1007 mb
Low level cloud: 34%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
19:00

N
N

5 / 11 mph 75 / 78°F 61% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
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