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Can 14 Day Long Range Forecast

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

Essex, United Kingdom

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

Taking a look at Can over the coming two weeks and the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 19°C expected on the afternoon of Sunday 26th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 28th at 8°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Sunday 2nd will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 26
May
00:00

SE
SE

7 / 14 mph 51 / 48°F 85%
Low level cloud: 9%
Mid level cloud: 66%
High level cloud: 72%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

6 / 9 mph 53 / 51°F 97%
Low level cloud: 85%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSE
SSE

11 / 14 mph 56 / 52°F 96%
Low level cloud: 62%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSW
SSW

11 / 15 mph 62 / 61°F 84%
Low level cloud: 72%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SW
SW

15 / 23 mph 66 / 65°F 72%
Low level cloud: 46%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

16 / 23 mph 65 / 64°F 76%
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
8%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

14 / 21 mph 61 / 59°F 83%
Low level cloud: 24%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

10 / 18 mph 54 / 50°F 94%
Low level cloud: 47%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

SW
SW

8 / 15 mph 50 / 47°F 97%
Low level cloud: 43%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

9 / 17 mph 48 / 43°F 95%
Low level cloud: 33%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

11 / 14 mph 52 / 47°F 91%
Low level cloud: 26%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

13 / 15 mph 58 / 54°F 74%
Low level cloud: 63%
Mid level cloud: 29%
High level cloud: 99%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

13 / 17 mph 63 / 62°F 58%
Low level cloud: 14%
Mid level cloud: 39%
High level cloud: 87%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

12 / 15 mph 62 / 61°F 66%
Low level cloud: 15%
Mid level cloud: 41%
High level cloud: 7%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

9 / 14 mph 56 / 54°F 82%
Low level cloud: 7%
Mid level cloud: 93%
High level cloud: 6%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

8 / 15 mph 50 / 46°F 93%
Low level cloud: 2%
Mid level cloud: 26%
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 28
May
00:00

SW
SW

7 / 14 mph 48 / 45°F 95%
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

6 / 13 mph 46 / 43°F 96%
Low level cloud: 28%
Mid level cloud: 66%
High level cloud: 57%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

10 / 13 mph 55 / 52°F 96%
Low level cloud: 85%
Mid level cloud: 19%
High level cloud: 33%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

14 / 18 mph 56 / 52°F 95%
Low level cloud: 93%
Mid level cloud: 98%
High level cloud: 66%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

13 / 18 mph 56 / 53°F 97%
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

14 / 18 mph 60 / 60°F 90%
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

16 / 23 mph 61 / 60°F 92%
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

14 / 21 mph 57 / 54°F 95%
Low level cloud: 93%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 29
May
00:00

SSW
SSW

15 / 22 mph 57 / 53°F 97%
Low level cloud: 100%
Mid level cloud: 20%
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

SW
SW

11 / 16 mph 56 / 54°F 97%
Low level cloud: 72%
Mid level cloud: 91%
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

WSW
WSW

12 / 17 mph 58 / 54°F 91%
Low level cloud: 33%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

16 / 19 mph 61 / 59°F 79%
Low level cloud: 40%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 18 mph 59 / 55°F 84%
Low level cloud: 41%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

15 / 20 mph 62 / 62°F 79%
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
18:00

WSW
WSW

14 / 21 mph 59 / 56°F 88%
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
71%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

13 / 22 mph 55 / 50°F 94%
Low level cloud: 43%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
00:00

W
W

13 / 21 mph 52 / 47°F 96%
Low level cloud: 50%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

12 / 19 mph 51 / 46°F 95%
Low level cloud: 91%
Mid level cloud: 26%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

13 / 18 mph 52 / 47°F 94%
Low level cloud: 98%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

14 / 17 mph 58 / 55°F 85%
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

13 / 18 mph 59 / 56°F 86%
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
91%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

15 / 23 mph 60 / 59°F 88%
Low level cloud: 64%
Mid level cloud: 55%
High level cloud: 32%
Most Significant Cloud Type: low
86%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

12 / 17 mph 54 / 50°F 95%
Low level cloud: 53%
Mid level cloud: 81%
High level cloud: 37%
Most Significant Cloud Type: low
85%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NW
NW

10 / 15 mph 52 / 48°F 97%
Low level cloud: 63%
Mid level cloud: 58%
High level cloud: 60%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
00:00

WNW
WNW

9 / 14 mph 50 / 47°F 98%
Low level cloud: 75%
Mid level cloud: 28%
High level cloud: 71%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

9 / 14 mph 51 / 47°F 97%
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 41%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

10 / 12 mph 52 / 49°F 95%
Low level cloud: 64%
Mid level cloud: 91%
High level cloud: 5%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

9 / 11 mph 53 / 50°F 92%
Low level cloud: 78%
Mid level cloud: 90%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

7 / 9 mph 52 / 49°F 97%
Low level cloud: 88%
Mid level cloud: 87%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WNW
WNW

5 / 6 mph 58 / 55°F 86%
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

4 / 6 mph 58 / 56°F 84%
Low level cloud: 65%
Mid level cloud: 54%
High level cloud: 17%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

5 / 8 mph 54 / 51°F 93%
Low level cloud: 31%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun
00:00

NNW
NNW

5 / 9 mph 51 / 50°F 95%
Low level cloud: 58%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 9 mph 49 / 47°F 96%
Low level cloud: 84%
Mid level cloud: 59%
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

NW
NW

6 / 9 mph 50 / 47°F 95%
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

8 / 9 mph 55 / 53°F 83%
Low level cloud: 69%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

6 / 7 mph 58 / 55°F 78%
Low level cloud: 31%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

4 / 5 mph 60 / 58°F 77%
Low level cloud: 52%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

4 / 5 mph 56 / 56°F 86%
Low level cloud: 29%
Mid level cloud: 100%
High level cloud: 73%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

4 / 6 mph 52 / 50°F 96%
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 02
Jun
00:00

NW
NW

8 / 17 mph 53 / 50°F 94%
Low level cloud: 31%
Mid level cloud: 32%
High level cloud: 18%
Most Significant Cloud Type: low
44%
0.0 In
06:00

WNW
WNW

11 / 22 mph 54 / 50°F 87%
Low level cloud: 96%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

21 / 43 mph 62 / 62°F 70%
Low level cloud: 65%
Mid level cloud: 5%
High level cloud: 81%
Most Significant Cloud Type: low
76%
0.0 In
18:00

N
N

19 / 39 mph 53 / 48°F 92%
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.0 In
Mon 03
Jun
00:00

SSW
SSW

4 / 7 mph 52 / 51°F 93%
Low level cloud: 83%
Mid level cloud: 74%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

5 / 11 mph 50 / 49°F 97%
Low level cloud: 91%
Mid level cloud: 88%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

6 / 13 mph 60 / 60°F 81%
Low level cloud: 14%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.2 In
18:00

NW
NW

11 / 23 mph 57 / 54°F 90%
Low level cloud: 17%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
45%
0.1 In
Tue 04
Jun
00:00

SW
SW

8 / 16 mph 53 / 51°F 97%
Low level cloud: 89%
Mid level cloud: 98%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WNW
WNW

9 / 20 mph 52 / 49°F 94%
Low level cloud: 90%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
12:00

W
W

10 / 21 mph 54 / 51°F 94%
Low level cloud: 89%
Mid level cloud: 98%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

8 / 16 mph 63 / 64°F 80%
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
0.0 In
Wed 05
Jun
00:00

W
W

7 / 15 mph 55 / 53°F 92%
Low level cloud: 93%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

9 / 19 mph 53 / 50°F 89%
Low level cloud: 17%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
20%
0.0 In
12:00

WNW
WNW

6 / 12 mph 62 / 62°F 77%
Low level cloud: 87%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
18:00

NW
NW

9 / 18 mph 58 / 56°F 80%
Low level cloud: 31%
Mid level cloud: 29%
High level cloud: 10%
Most Significant Cloud Type: low
42%
0.0 In
Thu 06
Jun
00:00

E
E

4 / 8 mph 58 / 59°F 91%
Low level cloud: 78%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
06:00

SW
SW

8 / 17 mph 53 / 51°F 90%
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ESE
ESE

5 / 11 mph 62 / 62°F 82%
Low level cloud: 64%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
18:00

WSW
WSW

14 / 29 mph 63 / 63°F 80%
Low level cloud: 29%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: low
32%
0.0 In
Fri 07
Jun
00:00

E
E

3 / 7 mph 55 / 55°F 92%
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 12%
Most Significant Cloud Type: medium
33%
0.0 In
06:00

WSW
WSW

12 / 25 mph 56 / 53°F 92%
Low level cloud: 84%
Mid level cloud: 9%
High level cloud: 17%
Most Significant Cloud Type: low
88%
0.0 In
12:00

ENE
ENE

10 / 20 mph 68 / 68°F 68%
Low level cloud: 31%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
33%
0.0 In
18:00

W
W

9 / 19 mph 63 / 63°F 81%
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 8%
Most Significant Cloud Type: low
41%
0.0 In
Sat 08
Jun
00:00

NNE
NNE

7 / 16 mph 50 / 47°F 85%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 86%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

WSW
WSW

7 / 14 mph 57 / 56°F 89%
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
12:00

NNE
NNE

10 / 21 mph 67 / 67°F 69%
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 83%
Most Significant Cloud Type: low
42%
0.0 In
18:00

W
W

4 / 9 mph 66 / 66°F 82%
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
51%
0.0 In
Sun 09
Jun
00:00

N
N

2 / 4 mph 59 / 60°F 89%
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

S
S

3 / 6 mph 62 / 62°F 88%
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 94%
Most Significant Cloud Type: medium
20%
0.0 In
12:00

WNW
WNW

4 / 9 mph 74 / 77°F 61%
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
18:00

ESE
ESE

9 / 20 mph 64 / 64°F 91%
Low level cloud: 29%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
50%
0.0 In
Mon 10
Jun
00:00

W
W

8 / 16 mph 58 / 57°F 95%
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 19%
Most Significant Cloud Type: medium
33%
0.0 In
06:00

W
W

8 / 17 mph 62 / 62°F 98%
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

W
W

14 / 30 mph 71 / 71°F 67%
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: low
26%
0.0 In
18:00

WNW
WNW

6 / 14 mph 64 / 64°F 84%
Low level cloud: 40%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
58%
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