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Stambourne 14 Day Long Range Forecast

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

Essex, United Kingdom

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

The next 14 day outlook for Stambourne shows the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 22°C expected on the afternoon of Wednesday 26th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Wednesday 19th at 8°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Friday 21st will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 17
Jun
15:00

WSW
WSW

9 / 12 mph 69 / 66°F 56% 1010 mb
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

5 / 7 mph 68 / 66°F 75% 1011 mb
Low level cloud: 3%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

6 / 14 mph 58 / 55°F 89% 1013 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 77%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun
00:00

NW
NW

5 / 9 mph 55 / 55°F 93% 1013 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 63%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 12 mph 52 / 50°F 94% 1014 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

6 / 9 mph 54 / 51°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

7 / 9 mph 62 / 60°F 74% 1014 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

6 / 7 mph 68 / 65°F 66% 1014 mb
Low level cloud: 48%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

3 / 4 mph 68 / 65°F 67% 1014 mb
Low level cloud: 17%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

11 / 16 mph 63 / 61°F 85% 1015 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

9 / 15 mph 55 / 51°F 97% 1017 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Jun
00:00

N
N

8 / 15 mph 49 / 45°F 97% 1019 mb
Low level cloud: 39%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

8 / 15 mph 47 / 44°F 98% 1019 mb
Low level cloud: 35%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 12 mph 52 / 47°F 93% 1020 mb
Low level cloud: 40%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 10 mph 60 / 57°F 73% 1021 mb
Low level cloud: 9%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 9 mph 66 / 64°F 63% 1021 mb
Low level cloud: 29%
Mid level cloud: 2%
High level cloud: 58%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

7 / 9 mph 66 / 64°F 64% 1021 mb
Low level cloud: 72%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

8 / 11 mph 63 / 60°F 80% 1022 mb
Low level cloud: 54%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

6 / 9 mph 58 / 55°F 92% 1023 mb
Low level cloud: 1%
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
Thu 20
Jun
00:00

E
E

6 / 12 mph 51 / 49°F 88% 1022 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

ENE
ENE

4 / 9 mph 48 / 47°F 88% 1021 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

6 / 9 mph 55 / 52°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

10 / 13 mph 63 / 61°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 17%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

13 / 15 mph 66 / 64°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

11 / 15 mph 65 / 63°F 67% 1017 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

10 / 15 mph 61 / 59°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 13 mph 54 / 51°F 96% 1015 mb
Low level cloud: 78%
Mid level cloud: 94%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Jun
00:00

N
N

11 / 17 mph 54 / 50°F 97% 1014 mb
Low level cloud: 80%
Mid level cloud: 100%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNW
NNW

14 / 23 mph 53 / 49°F 97% 1012 mb
Low level cloud: 67%
Mid level cloud: 87%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

NW
NW

14 / 22 mph 53 / 49°F 97% 1013 mb
Low level cloud: 84%
Mid level cloud: 82%
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

NNW
NNW

12 / 17 mph 56 / 52°F 92% 1013 mb
Low level cloud: 37%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

10 / 11 mph 68 / 66°F 65% 1013 mb
Low level cloud: 32%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

11 / 15 mph 70 / 68°F 68% 1012 mb
Low level cloud: 30%
Mid level cloud: 17%
High level cloud: 1%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

13 / 20 mph 66 / 64°F 85% 1011 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

9 / 18 mph 59 / 56°F 91% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Jun
00:00

WSW
WSW

8 / 16 mph 54 / 52°F 90% 1012 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 89%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

9 / 15 mph 54 / 51°F 93% 1012 mb
Low level cloud: 0%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

10 / 14 mph 56 / 53°F 89% 1011 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

12 / 15 mph 64 / 62°F 71% 1010 mb
Low level cloud: 23%
Mid level cloud: 47%
High level cloud: 18%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

14 / 17 mph 68 / 67°F 61% 1009 mb
Low level cloud: 39%
Mid level cloud: 82%
High level cloud: 94%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

13 / 17 mph 59 / 56°F 84% 1010 mb
Low level cloud: 45%
Mid level cloud: 79%
High level cloud: 47%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

7 / 11 mph 55 / 53°F 96% 1009 mb
Low level cloud: 88%
Mid level cloud: 96%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

5 / 8 mph 54 / 52°F 98% 1010 mb
Low level cloud: 83%
Mid level cloud: 83%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Jun
00:00

WSW
WSW

5 / 8 mph 53 / 52°F 97% 1010 mb
Low level cloud: 67%
Mid level cloud: 61%
High level cloud: 21%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

5 / 8 mph 53 / 52°F 98% 1010 mb
Low level cloud: 60%
Mid level cloud: 86%
High level cloud: 2%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

7 / 11 mph 53 / 49°F 93% 1012 mb
Low level cloud: 3%
Mid level cloud: 66%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

11 / 13 mph 62 / 60°F 75% 1013 mb
Low level cloud: 8%
Mid level cloud: 33%
High level cloud: 33%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

10 / 12 mph 67 / 65°F 61% 1014 mb
Low level cloud: 17%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

9 / 11 mph 69 / 66°F 60% 1014 mb
Low level cloud: 54%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

6 / 8 mph 68 / 65°F 77% 1014 mb
Low level cloud: 0%
Mid level cloud: 20%
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

WSW
WSW

8 / 16 mph 59 / 56°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Jun
00:00

ENE
ENE

2 / 4 mph 59 / 61°F 95% 1019 mb
Low level cloud: 28%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: low
36%
0.0 In
06:00

NNW
NNW

11 / 23 mph 50 / 46°F 92% 1015 mb
Low level cloud: 44%
Mid level cloud: 50%
High level cloud: 33%
Most Significant Cloud Type: low
65%
0.0 In
12:00

WSW
WSW

12 / 25 mph 70 / 70°F 73% 1018 mb
Low level cloud: 62%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: low
65%
0.0 In
18:00

SW
SW

10 / 21 mph 70 / 70°F 77% 1015 mb
Low level cloud: 19%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
21%
0.0 In
Tue 25
Jun
00:00

ESE
ESE

5 / 9 mph 59 / 59°F 96% 1023 mb
Low level cloud: 17%
Mid level cloud: 9%
High level cloud: 21%
Most Significant Cloud Type: low
22%
0.0 In
06:00

W
W

6 / 11 mph 61 / 61°F 81% 1017 mb
Low level cloud: 11%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: low
12%
0.0 In
12:00

SE
SE

12 / 22 mph 68 / 68°F 64% 1017 mb
Low level cloud: 22%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

NE
NE

9 / 16 mph 65 / 65°F 70% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 26
Jun
00:00

E
E

8 / 17 mph 55 / 52°F 90% 1012 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
06:00

NNE
NNE

6 / 11 mph 55 / 53°F 87% 1023 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
12:00

ESE
ESE

15 / 28 mph 68 / 68°F 70% 1006 mb
Low level cloud: 14%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
18:00

NE
NE

9 / 16 mph 65 / 65°F 74% 1022 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Thu 27
Jun
00:00

SSW
SSW

8 / 15 mph 57 / 55°F 97% 1004 mb
Low level cloud: 90%
Mid level cloud: 23%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.4 In
06:00

NNE
NNE

8 / 14 mph 54 / 52°F 91% 1022 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
38%
0.0 In
12:00

ESE
ESE

12 / 23 mph 62 / 62°F 69% 1005 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 54%
Most Significant Cloud Type: low
64%
0.0 In
18:00

E
E

6 / 11 mph 66 / 66°F 79% 1020 mb
Low level cloud: 53%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: low
56%
0.0 In
Fri 28
Jun
00:00

E
E

6 / 11 mph 52 / 51°F 97% 1010 mb
Low level cloud: 53%
Mid level cloud: 6%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

4 / 7 mph 60 / 60°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

NW
NW

7 / 14 mph 64 / 64°F 75% 1012 mb
Low level cloud: 75%
Mid level cloud: 25%
High level cloud: 19%
Most Significant Cloud Type: low
85%
0.0 In
18:00

SE
SE

7 / 12 mph 68 / 68°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 29
Jun
00:00

S
S

4 / 7 mph 60 / 60°F 95% 1014 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
53%
0.1 In
06:00

E
E

4 / 8 mph 61 / 62°F 77% 1018 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

9 / 20 mph 67 / 67°F 68% 1015 mb
Low level cloud: 21%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
42%
0.0 In
18:00

E
E

8 / 14 mph 67 / 67°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 30
Jun
00:00

ESE
ESE

7 / 15 mph 58 / 57°F 83% 1015 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
68%
0.0 In
06:00

NE
NE

8 / 14 mph 59 / 57°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

ESE
ESE

12 / 25 mph 69 / 69°F 71% 1014 mb
Low level cloud: 20%
Mid level cloud: 23%
High level cloud: 17%
Most Significant Cloud Type: low
30%
0.0 In
18:00

ENE
ENE

9 / 15 mph 69 / 69°F 68% 1008 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
Mon 01
Jul
00:00

NE
NE

9 / 19 mph 56 / 53°F 86% 1015 mb
Low level cloud: 8%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
06:00

NNE
NNE

8 / 15 mph 62 / 62°F 90% 1005 mb
Low level cloud: 24%
Mid level cloud: 66%
High level cloud: 4%
Most Significant Cloud Type: low
47%
0.0 In
12:00

ENE
ENE

16 / 33 mph 70 / 71°F 62% 1014 mb
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
19%
0.0 In
18:00

ESE
ESE

8 / 17 mph 68 / 68°F 85% 1003 mb
Low level cloud: 10%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
0.2 In
Tue 02
Jul
00:00

NNE
NNE

13 / 27 mph 57 / 54°F 89% 1013 mb
Low level cloud: 31%
Mid level cloud: 23%
High level cloud: 60%
Most Significant Cloud Type: low
46%
0.0 In
06:00

S
S

6 / 13 mph 64 / 64°F 94% 1000 mb
Low level cloud: 77%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
12:00

ENE
ENE

18 / 38 mph 68 / 68°F 73% 1011 mb
Low level cloud: 87%
Mid level cloud: 31%
High level cloud: 1%
Most Significant Cloud Type: low
97%
0.0 In
18:00

S
S

16 / 33 mph 61 / 61°F 82% 998 mb
Low level cloud: 96%
Mid level cloud: 90%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 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