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New Costessey 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for New Costessey

Norfolk, United Kingdom

Long range weather outlook for New Costessey includes 14 day forecast summary:

The outlook for New Costessey in the two weeks ahead shows the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 20°C expected on the afternoon of Monday 27th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 9°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 22nd will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 19
May
00:00

N
N

6 / 12 kts 50 / 48°F 97%
Low level cloud: 28%
Mid level cloud: 13%
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

6 / 13 kts 50 / 47°F 96%
Low level cloud: 2%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

6 / 12 kts 55 / 52°F 90%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

9 / 12 kts 63 / 62°F 70%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

10 / 12 kts 65 / 64°F 64%
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
15:00

NNE
NNE

10 / 11 kts 64 / 63°F 73%
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
18:00

NNE
NNE

8 / 11 kts 59 / 56°F 83%
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
21:00

N
N

7 / 14 kts 51 / 48°F 87%
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 20
May
00:00

N
N

7 / 14 kts 49 / 46°F 95%
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

N
N

7 / 13 kts 48 / 44°F 99%
Low level cloud: 67%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 13 kts 53 / 48°F 93%
Low level cloud: 54%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 13 kts 58 / 55°F 76%
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

11 / 13 kts 61 / 59°F 68%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

11 / 13 kts 58 / 55°F 66%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

9 / 13 kts 54 / 49°F 78%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 12 kts 51 / 47°F 84%
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

N
N

7 / 13 kts 49 / 45°F 94%
Low level cloud: 21%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

7 / 13 kts 48 / 44°F 97%
Low level cloud: 64%
Mid level cloud: 21%
High level cloud: 73%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

6 / 9 kts 53 / 50°F 92%
Low level cloud: 79%
Mid level cloud: 58%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

4 / 5 kts 60 / 59°F 85%
Low level cloud: 82%
Mid level cloud: 8%
High level cloud: 88%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

3 / 4 kts 63 / 63°F 78%
Low level cloud: 75%
Mid level cloud: 90%
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

NE
NE

4 / 5 kts 64 / 63°F 78%
Low level cloud: 53%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

5 / 8 kts 60 / 57°F 93%
Low level cloud: 33%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

6 / 11 kts 55 / 53°F 96%
Low level cloud: 32%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NW
NW

9 / 15 kts 54 / 51°F 98%
Low level cloud: 84%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

NNW
NNW

13 / 21 kts 53 / 48°F 98%
Low level cloud: 95%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
06:00

NW
NW

11 / 19 kts 52 / 47°F 98%
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

WNW
WNW

14 / 20 kts 54 / 49°F 97%
Low level cloud: 94%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

13 / 17 kts 56 / 52°F 95%
Low level cloud: 100%
Mid level cloud: 76%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

13 / 17 kts 57 / 54°F 93%
Low level cloud: 91%
Mid level cloud: 61%
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

WSW
WSW

11 / 16 kts 57 / 53°F 93%
Low level cloud: 54%
Mid level cloud: 91%
High level cloud: 33%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

9 / 16 kts 55 / 52°F 93%
Low level cloud: 18%
Mid level cloud: 17%
High level cloud: 21%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

9 / 17 kts 52 / 49°F 95%
Low level cloud: 13%
Mid level cloud: 20%
High level cloud: 7%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

8 / 16 kts 50 / 46°F 96%
Low level cloud: 23%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

8 / 12 kts 54 / 50°F 93%
Low level cloud: 51%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 13 kts 59 / 56°F 86%
Low level cloud: 92%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

10 / 13 kts 60 / 60°F 81%
Low level cloud: 92%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

9 / 12 kts 64 / 62°F 78%
Low level cloud: 64%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

5 / 8 kts 64 / 62°F 82%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

6 / 12 kts 55 / 54°F 94%
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SW
SW

5 / 10 kts 53 / 51°F 95%
Low level cloud: 15%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

5 / 10 kts 51 / 49°F 96%
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

3 / 4 kts 56 / 53°F 92%
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

1 / 1 kts 63 / 62°F 77%
Low level cloud: 72%
Mid level cloud: 39%
High level cloud: 28%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

2 / 2 kts 67 / 64°F 69%
Low level cloud: 54%
Mid level cloud: 24%
High level cloud: 87%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

4 / 6 kts 63 / 60°F 88%
Low level cloud: 25%
Mid level cloud: 57%
High level cloud: 32%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

4 / 5 kts 61 / 59°F 89%
Low level cloud: 47%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

0 / 1 kts 53 / 53°F 93%
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

NW
NW

2 / 5 kts 53 / 53°F 92%
Low level cloud: 7%
Mid level cloud: 74%
High level cloud: 1%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

3 / 6 kts 54 / 53°F 92%
Low level cloud: 8%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

4 / 7 kts 55 / 53°F 93%
Low level cloud: 16%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

6 / 7 kts 62 / 59°F 83%
Low level cloud: 20%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

6 / 7 kts 62 / 62°F 76%
Low level cloud: 91%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

7 / 9 kts 61 / 60°F 82%
Low level cloud: 77%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 9 kts 62 / 60°F 85%
Low level cloud: 34%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

5 / 9 kts 55 / 51°F 97%
Low level cloud: 53%
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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 26
May
00:00

E
E

6 / 13 kts 52 / 49°F 97%
Low level cloud: 27%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
45%
0.0 In
06:00

SE
SE

5 / 6 kts 59 / 59°F 85%
Low level cloud: 21%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
12:00

SSE
SSE

9 / 19 kts 60 / 60°F 87%
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

6 / 13 kts 65 / 65°F 87%
Low level cloud: 4%
Mid level cloud: 32%
High level cloud: 89%
Most Significant Cloud Type: medium
46%
0.0 In
Mon 27
May
00:00

SSW
SSW

6 / 13 kts 51 / 48°F 93%
Low level cloud: 16%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
06:00

NNE
NNE

9 / 17 kts 57 / 54°F 94%
Low level cloud: 55%
Mid level cloud: 25%
High level cloud: 7%
Most Significant Cloud Type: low
64%
0.0 In
12:00

SW
SW

12 / 23 kts 64 / 64°F 63%
Low level cloud: 82%
Mid level cloud: 9%
High level cloud: 39%
Most Significant Cloud Type: low
90%
0.0 In
18:00

NE
NE

10 / 19 kts 60 / 60°F 87%
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
Tue 28
May
00:00

SSW
SSW

12 / 25 kts 55 / 51°F 90%
Low level cloud: 75%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

9 / 16 kts 57 / 54°F 93%
Low level cloud: 37%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: low
40%
0.0 In
12:00

WSW
WSW

15 / 31 kts 62 / 62°F 66%
Low level cloud: 89%
Mid level cloud: 11%
High level cloud: 90%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNE
NNE

10 / 18 kts 59 / 59°F 90%
Low level cloud: 45%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: low
50%
0.0 In
Wed 29
May
00:00

SSW
SSW

6 / 13 kts 54 / 52°F 98%
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
06:00

N
N

8 / 15 kts 58 / 55°F 93%
Low level cloud: 59%
Mid level cloud: 9%
High level cloud: 40%
Most Significant Cloud Type: low
67%
0.0 In
12:00

W
W

13 / 28 kts 64 / 64°F 62%
Low level cloud: 61%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.2 In
18:00

NNE
NNE

10 / 18 kts 60 / 60°F 87%
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 16%
Most Significant Cloud Type: low
18%
0.0 In
Thu 30
May
00:00

W
W

8 / 18 kts 50 / 46°F 95%
Low level cloud: 9%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.1 In
06:00

NNE
NNE

12 / 22 kts 56 / 53°F 90%
Low level cloud: 32%
Mid level cloud: 10%
High level cloud: 44%
Most Significant Cloud Type: low
40%
0.0 In
12:00

N
N

7 / 15 kts 59 / 60°F 73%
Low level cloud: 79%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
18:00

NNE
NNE

16 / 29 kts 52 / 47°F 81%
Low level cloud: 59%
Mid level cloud: 6%
High level cloud: 41%
Most Significant Cloud Type: low
66%
0.0 In
Fri 31
May
00:00

SSE
SSE

4 / 8 kts 50 / 48°F 95%
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
0.0 In
06:00

N
N

13 / 24 kts 49 / 43°F 67%
Low level cloud: 83%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

4 / 9 kts 65 / 65°F 63%
Low level cloud: 12%
Mid level cloud: 55%
High level cloud: 9%
Most Significant Cloud Type: medium
88%
0.0 In
18:00

NNW
NNW

13 / 25 kts 55 / 51°F 77%
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 84%
Most Significant Cloud Type: low
100%
0.0 In
Sat 01
Jun
00:00

SSE
SSE

4 / 9 kts 56 / 55°F 97%
Low level cloud: 76%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NW
NW

11 / 20 kts 48 / 43°F 82%
Low level cloud: 91%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
12:00

S
S

10 / 21 kts 56 / 53°F 98%
Low level cloud: 95%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
18:00

NW
NW

3 / 6 kts 61 / 61°F 69%
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 02
Jun
00:00

S
S

6 / 13 kts 60 / 60°F 97%
Low level cloud: 36%
Mid level cloud: 20%
High level cloud: 87%
Most Significant Cloud Type: low
53%
0.0 In
06:00

W
W

7 / 14 kts 49 / 46°F 82%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 17%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

S
S

15 / 31 kts 72 / 71°F 83%
Low level cloud: 86%
Mid level cloud: 34%
High level cloud: 31%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

6 / 11 kts 55 / 54°F 87%
Low level cloud: 30%
Mid level cloud: 99%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
0.1 In
Mon 03
Jun
00:00

WSW
WSW

14 / 30 kts 55 / 51°F 82%
Low level cloud: 40%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
53%
0.0 In
06:00

WNW
WNW

6 / 13 kts 51 / 48°F 87%
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 16%
Most Significant Cloud Type: medium
38%
0.0 In
12:00

SW
SW

16 / 35 kts 65 / 65°F 65%
Low level cloud: 30%
Mid level cloud: 12%
High level cloud: 33%
Most Significant Cloud Type: low
38%
0.0 In
18:00

ENE
ENE

5 / 11 kts 58 / 57°F 82%
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 3%
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