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Ratling 14 Day Long Range Forecast

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

Kent, United Kingdom

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

The next 14 day outlook for Ratling shows the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 21°C expected on the afternoon of Saturday 25th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 25th at 10°C. The fortnight ahead will have most days seeing a little rain. It looks like Wednesday 22nd will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

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

SW
SW

4 / 9 kts 52 / 50°F 94%
Low level cloud: 4%
Mid level cloud: 17%
High level cloud: 40%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

3 / 6 kts 50 / 49°F 92%
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

2 / 3 kts 54 / 55°F 89%
Low level cloud: 2%
Mid level cloud: 96%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

2 / 3 kts 64 / 61°F 78%
Low level cloud: 47%
Mid level cloud: 51%
High level cloud: 25%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

0 / 1 kts 65 / 64°F 72%
Low level cloud: 63%
Mid level cloud: 64%
High level cloud: 17%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

2 / 3 kts 67 / 64°F 76%
Low level cloud: 49%
Mid level cloud: 53%
High level cloud: 40%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

2 / 3 kts 65 / 62°F 85%
Low level cloud: 0%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

1 / 3 kts 55 / 56°F 84%
Low level cloud: 16%
Mid level cloud: 99%
High level cloud: 48%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNW
NNW

3 / 6 kts 53 / 52°F 89%
Low level cloud: 5%
Mid level cloud: 69%
High level cloud: 92%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 10 kts 53 / 51°F 97%
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

8 / 11 kts 53 / 50°F 98%
Low level cloud: 95%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

10 / 13 kts 57 / 53°F 95%
Low level cloud: 76%
Mid level cloud: 24%
High level cloud: 10%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

6 / 7 kts 63 / 61°F 79%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 24%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

5 / 6 kts 67 / 65°F 68%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

6 / 8 kts 62 / 60°F 85%
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

NNE
NNE

6 / 11 kts 53 / 51°F 96%
Low level cloud: 35%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

6 / 12 kts 52 / 49°F 96%
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 12 kts 50 / 47°F 97%
Low level cloud: 29%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

8 / 11 kts 54 / 50°F 94%
Low level cloud: 41%
Mid level cloud: 42%
High level cloud: 5%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

10 / 13 kts 58 / 54°F 84%
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

11 / 13 kts 63 / 62°F 73%
Low level cloud: 19%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

10 / 12 kts 63 / 62°F 72%
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

9 / 13 kts 59 / 56°F 84%
Low level cloud: 2%
Mid level cloud: 6%
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

N
N

12 / 19 kts 53 / 49°F 86%
Low level cloud: 36%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

11 / 16 kts 53 / 49°F 95%
Low level cloud: 99%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

11 / 16 kts 51 / 47°F 91%
Low level cloud: 92%
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
06:00

N
N

12 / 17 kts 51 / 46°F 93%
Low level cloud: 83%
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
09:00

NNE
NNE

13 / 17 kts 53 / 48°F 87%
Low level cloud: 96%
Mid level cloud: 47%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

11 / 13 kts 55 / 52°F 85%
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

9 / 11 kts 57 / 54°F 88%
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

9 / 11 kts 56 / 53°F 92%
Low level cloud: 99%
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
21:00

NNE
NNE

6 / 8 kts 54 / 52°F 96%
Low level cloud: 94%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

4 / 6 kts 54 / 52°F 97%
Low level cloud: 90%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

3 / 5 kts 53 / 53°F 91%
Low level cloud: 86%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

3 / 4 kts 54 / 54°F 94%
Low level cloud: 89%
Mid level cloud: 28%
High level cloud: 81%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

3 / 4 kts 58 / 58°F 87%
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

4 / 5 kts 58 / 57°F 87%
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 87%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

2 / 3 kts 62 / 61°F 82%
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

6 / 8 kts 60 / 57°F 90%
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

3 / 5 kts 55 / 55°F 94%
Low level cloud: 63%
Mid level cloud: 28%
High level cloud: 13%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NE
NE

2 / 4 kts 54 / 55°F 95%
Low level cloud: 94%
Mid level cloud: 42%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

2 / 4 kts 54 / 54°F 96%
Low level cloud: 81%
Mid level cloud: 40%
High level cloud: 15%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

4 / 5 kts 55 / 54°F 97%
Low level cloud: 87%
Mid level cloud: 52%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

7 / 10 kts 59 / 57°F 92%
Low level cloud: 93%
Mid level cloud: 45%
High level cloud: 30%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

7 / 10 kts 63 / 61°F 85%
Low level cloud: 43%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

10 / 13 kts 65 / 64°F 75%
Low level cloud: 53%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

7 / 11 kts 63 / 61°F 88%
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: medium
26%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

6 / 13 kts 54 / 52°F 94%
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 20%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WSW
WSW

6 / 13 kts 52 / 49°F 95%
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 62%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

5 / 11 kts 50 / 48°F 96%
Low level cloud: 16%
Mid level cloud: 8%
High level cloud: 86%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

5 / 8 kts 55 / 51°F 93%
Low level cloud: 19%
Mid level cloud: 27%
High level cloud: 63%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

4 / 5 kts 62 / 61°F 80%
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

2 / 3 kts 62 / 62°F 81%
Low level cloud: 74%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

6 / 8 kts 62 / 62°F 81%
Low level cloud: 56%
Mid level cloud: 87%
High level cloud: 78%
Most Significant Cloud Type: low
95%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WSW
WSW

3 / 4 kts 64 / 62°F 86%
Low level cloud: 56%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

1 / 3 kts 55 / 56°F 93%
Low level cloud: 8%
Mid level cloud: 15%
High level cloud: 42%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
00:00

WSW
WSW

9 / 20 kts 56 / 53°F 98%
Low level cloud: 96%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SE
SE

2 / 4 kts 51 / 51°F 95%
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

7 / 15 kts 57 / 55°F 96%
Low level cloud: 97%
Mid level cloud: 99%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

5 / 9 kts 63 / 63°F 83%
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 84%
Most Significant Cloud Type: medium
39%
0.0 In
Sat 25
May
00:00

E
E

12 / 21 kts 56 / 53°F 97%
Low level cloud: 82%
Mid level cloud: 26%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

9 / 19 kts 53 / 49°F 92%
Low level cloud: 19%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
12:00

ENE
ENE

13 / 24 kts 59 / 59°F 85%
Low level cloud: 90%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
98%
0.0 In
18:00

NNW
NNW

1 / 4 kts 72 / 76°F 81%
Low level cloud: 12%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
20%
0.0 In
Sun 26
May
00:00

ENE
ENE

6 / 11 kts 56 / 55°F 95%
Low level cloud: 5%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
06:00

W
W

5 / 11 kts 59 / 58°F 91%
Low level cloud: 14%
Mid level cloud: 50%
High level cloud: 17%
Most Significant Cloud Type: medium
90%
0.0 In
12:00

SE
SE

11 / 20 kts 60 / 60°F 88%
Low level cloud: 72%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
18:00

W
W

6 / 14 kts 63 / 63°F 93%
Low level cloud: 89%
Mid level cloud: 71%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
Mon 27
May
00:00

NE
NE

6 / 12 kts 56 / 55°F 98%
Low level cloud: 26%
Mid level cloud: 29%
High level cloud: 99%
Most Significant Cloud Type: low
47%
0.1 In
06:00

NNW
NNW

5 / 11 kts 57 / 56°F 91%
Low level cloud: 64%
Mid level cloud: 16%
High level cloud: 33%
Most Significant Cloud Type: low
73%
0.0 In
12:00

NNE
NNE

13 / 26 kts 62 / 62°F 79%
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: low
21%
0.1 In
18:00

S
S

4 / 10 kts 68 / 68°F 84%
Low level cloud: 10%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
13%
0.0 In
Tue 28
May
00:00

N
N

10 / 21 kts 52 / 48°F 87%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
06:00

SSW
SSW

8 / 17 kts 58 / 56°F 92%
Low level cloud: 32%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
12:00

NNE
NNE

10 / 20 kts 62 / 62°F 69%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

SW
SW

10 / 21 kts 61 / 61°F 89%
Low level cloud: 90%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Wed 29
May
00:00

N
N

6 / 14 kts 50 / 47°F 97%
Low level cloud: 46%
Mid level cloud: 1%
High level cloud: 16%
Most Significant Cloud Type: low
48%
0.0 In
06:00

NW
NW

11 / 24 kts 49 / 43°F 92%
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 81%
Most Significant Cloud Type: low
42%
0.1 In
12:00

NNE
NNE

9 / 18 kts 63 / 63°F 77%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

N
N

0 / 1 kts 64 / 64°F 74%
Low level cloud: 9%
Mid level cloud: 22%
High level cloud: 38%
Most Significant Cloud Type: low
21%
0.0 In
Thu 30
May
00:00

NNE
NNE

7 / 14 kts 53 / 51°F 98%
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

NW
NW

6 / 12 kts 52 / 50°F 89%
Low level cloud: 15%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
12:00

NE
NE

11 / 22 kts 64 / 64°F 79%
Low level cloud: 5%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
18:00

NNW
NNW

3 / 7 kts 63 / 63°F 76%
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
Fri 31
May
00:00

NNE
NNE

12 / 25 kts 55 / 51°F 95%
Low level cloud: 42%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
06:00

SSW
SSW

7 / 16 kts 52 / 49°F 91%
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
14%
0.0 In
12:00

NNE
NNE

15 / 32 kts 62 / 62°F 77%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
18:00

SSW
SSW

12 / 27 kts 52 / 48°F 94%
Low level cloud: 86%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sat 01
Jun
00:00

NNW
NNW

15 / 31 kts 52 / 47°F 95%
Low level cloud: 99%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SW
SW

7 / 14 kts 56 / 54°F 98%
Low level cloud: 79%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.3 In
12:00

NNE
NNE

17 / 35 kts 62 / 62°F 81%
Low level cloud: 65%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.2 In
18:00

SSW
SSW

7 / 14 kts 64 / 64°F 78%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
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