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Cornsay 14 Day Long Range Forecast

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

County Durham, United Kingdom

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

For Cornsay in the coming two weeks the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 21°C expected on the evening of Thursday 19th. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Friday 27th at 2°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 28th 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
HumidityPressureCloud AmountPrecip AmountWeather
Thu 19
Apr
15:00

SW
SW

9 / 15 mph 69 / 68°F 58% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

8 / 9 mph 69 / 68°F 73% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

6 / 7 mph 63 / 63°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 20
Apr
00:00

W
W

5 / 7 mph 57 / 56°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

5 / 6 mph 53 / 52°F 84% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

5 / 9 mph 52 / 49°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

9 / 14 mph 57 / 54°F 74% 1024 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

9 / 13 mph 61 / 60°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

11 / 17 mph 61 / 60°F 52% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

8 / 9 mph 62 / 60°F 64% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

6 / 7 mph 56 / 55°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 21
Apr
00:00

W
W

4 / 6 mph 51 / 49°F 78% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

2 / 4 mph 48 / 48°F 82% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SSW
SSW

2 / 4 mph 48 / 47°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SE
SE

6 / 9 mph 54 / 51°F 66% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SSE
SSE

9 / 12 mph 62 / 60°F 66% 1020 mb
Low level cloud: 58%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: low
62%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSE
SSE

10 / 16 mph 62 / 61°F 79% 1017 mb
Low level cloud: 71%
Mid level cloud: 25%
High level cloud: 38%
Most Significant Cloud Type: low
84%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

SSE
SSE

8 / 13 mph 64 / 62°F 85% 1014 mb
Low level cloud: 24%
Mid level cloud: 17%
High level cloud: 79%
Most Significant Cloud Type: low
39%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
21:00

SSE
SSE

6 / 11 mph 60 / 60°F 94% 1013 mb
Low level cloud: 6%
Mid level cloud: 17%
High level cloud: 85%
Most Significant Cloud Type: medium
36%
Expect 0.14 In of precipitation over the past 3 hours.
0.14 In
Sun 22
Apr
00:00

SSW
SSW

8 / 14 mph 58 / 57°F 92% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 91%
Most Significant Cloud Type: medium
13%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
03:00

SSW
SSW

8 / 13 mph 56 / 54°F 93% 1008 mb
Low level cloud: 6%
Mid level cloud: 21%
High level cloud: 48%
Most Significant Cloud Type: medium
39%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SSW
SSW

8 / 13 mph 56 / 53°F 94% 1006 mb
Low level cloud: 18%
Mid level cloud: 9%
High level cloud: 85%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

14 / 22 mph 54 / 50°F 81% 1006 mb
Low level cloud: 39%
Mid level cloud: 94%
High level cloud: 99%
Most Significant Cloud Type: low
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

16 / 22 mph 53 / 47°F 72% 1007 mb
Low level cloud: 45%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

W
W

16 / 24 mph 54 / 49°F 58% 1007 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

13 / 18 mph 51 / 46°F 71% 1007 mb
Low level cloud: 6%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

11 / 17 mph 47 / 42°F 81% 1008 mb
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 23
Apr
00:00

WSW
WSW

14 / 21 mph 46 / 40°F 77% 1008 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

15 / 27 mph 45 / 38°F 79% 1007 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

14 / 28 mph 44 / 37°F 80% 1007 mb
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

20 / 37 mph 47 / 39°F 71% 1008 mb
Low level cloud: 41%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

19 / 31 mph 50 / 43°F 69% 1008 mb
Low level cloud: 90%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

18 / 23 mph 52 / 46°F 72% 1008 mb
Low level cloud: 59%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

13 / 19 mph 51 / 46°F 78% 1007 mb
Low level cloud: 68%
Mid level cloud: 32%
High level cloud: 38%
Most Significant Cloud Type: low
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

11 / 17 mph 48 / 43°F 85% 1008 mb
Low level cloud: 48%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Tue 24
Apr
00:00

W
W

16 / 26 mph 44 / 37°F 80% 1009 mb
Low level cloud: 25%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

16 / 25 mph 42 / 34°F 79% 1010 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

13 / 22 mph 42 / 34°F 81% 1010 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

13 / 19 mph 47 / 41°F 67% 1010 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

11 / 15 mph 52 / 47°F 61% 1009 mb
Low level cloud: 4%
Mid level cloud: 76%
High level cloud: 33%
Most Significant Cloud Type: medium
88%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

6 / 9 mph 46 / 43°F 85% 1006 mb
Low level cloud: 79%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.11 In of precipitation over the past 3 hours.
0.11 In
18:00

E
E

5 / 8 mph 44 / 41°F 92% 1002 mb
Low level cloud: 92%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.14 In of precipitation over the past 3 hours.
0.14 In
21:00

N
N

9 / 15 mph 43 / 38°F 92% 1002 mb
Low level cloud: 74%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.18 In of precipitation over the past 3 hours.
0.18 In
Wed 25
Apr
00:00

NW
NW

12 / 20 mph 42 / 36°F 90% 1004 mb
Low level cloud: 88%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

WNW
WNW

12 / 19 mph 41 / 34°F 89% 1006 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

13 / 21 mph 41 / 33°F 88% 1008 mb
Low level cloud: 10%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

17 / 26 mph 46 / 38°F 75% 1009 mb
Low level cloud: 52%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

19 / 26 mph 49 / 42°F 67% 1009 mb
Low level cloud: 16%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

WSW
WSW

21 / 31 mph 49 / 41°F 68% 1008 mb
Low level cloud: 35%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
18:00

W
W

15 / 25 mph 46 / 39°F 73% 1008 mb
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

WSW
WSW

13 / 20 mph 43 / 37°F 78% 1009 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 26
Apr
00:00

W
W

12 / 17 mph 44 / 37°F 78% 1005 mb
Low level cloud: 1%
Mid level cloud: 86%
High level cloud: 33%
Most Significant Cloud Type: medium
89%
0.00 In
06:00

WSW
WSW

13 / 21 mph 42 / 35°F 81% 1011 mb
Low level cloud: 29%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.00 In
12:00

NNW
NNW

13 / 20 mph 45 / 39°F 59% 1008 mb
Low level cloud: 29%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.01 In
18:00

WNW
WNW

16 / 21 mph 53 / 48°F 69% 1015 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.01 In
Fri 27
Apr
00:00

W
W

22 / 36 mph 41 / 32°F 75% 1008 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.00 In
06:00

WSW
WSW

10 / 16 mph 41 / 35°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 2%
Most Significant Cloud Type: medium
81%
0.00 In
12:00

W
W

13 / 18 mph 51 / 47°F 62% 1021 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
57%
0.00 In
18:00

WSW
WSW

6 / 7 mph 56 / 55°F 72% 1016 mb
Low level cloud: 8%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: low
17%
0.01 In
Sat 28
Apr
00:00

SSW
SSW

14 / 23 mph 46 / 40°F 83% 1017 mb
Low level cloud: 1%
Mid level cloud: 77%
High level cloud: 94%
Most Significant Cloud Type: medium
83%
0.02 In
06:00

ENE
ENE

6 / 10 mph 41 / 37°F 93% 1009 mb
Low level cloud: 87%
Mid level cloud: 87%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.08 In
12:00

SW
SW

26 / 37 mph 55 / 49°F 60% 1009 mb
Low level cloud: 11%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
69%
0.00 In
18:00

ENE
ENE

14 / 16 mph 43 / 36°F 93% 1005 mb
Low level cloud: 92%
Mid level cloud: 65%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.26 In
Sun 29
Apr
00:00

W
W

14 / 23 mph 43 / 36°F 81% 1010 mb
Low level cloud: 12%
Mid level cloud: 75%
High level cloud: 91%
Most Significant Cloud Type: medium
100%
0.01 In
06:00

NW
NW

11 / 17 mph 39 / 33°F 91% 1009 mb
Low level cloud: 41%
Mid level cloud: 53%
High level cloud: 26%
Most Significant Cloud Type: low
62%
0.03 In
12:00

W
W

24 / 31 mph 48 / 40°F 62% 1012 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
66%
0.01 In
18:00

WSW
WSW

8 / 14 mph 50 / 47°F 80% 1008 mb
Low level cloud: 3%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
20%
0.18 In
Mon 30
Apr
00:00

WNW
WNW

22 / 37 mph 43 / 34°F 78% 1014 mb
Low level cloud: 53%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.03 In
06:00

S
S

9 / 12 mph 39 / 33°F 93% 1003 mb
Low level cloud: 20%
Mid level cloud: 34%
High level cloud: 67%
Most Significant Cloud Type: low
39%
0.00 In
12:00

NW
NW

11 / 16 mph 52 / 49°F 71% 1021 mb
Low level cloud: 64%
Mid level cloud: 15%
High level cloud: 13%
Most Significant Cloud Type: low
70%
0.02 In
18:00

SE
SE

17 / 28 mph 47 / 40°F 86% 996 mb
Low level cloud: 68%
Mid level cloud: 52%
High level cloud: 76%
Most Significant Cloud Type: low
95%
0.07 In
Tue 01
May
00:00

WNW
WNW

5 / 7 mph 47 / 45°F 94% 1025 mb
Low level cloud: 59%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.04 In
06:00

SSE
SSE

11 / 16 mph 43 / 37°F 95% 993 mb
Low level cloud: 54%
Mid level cloud: 38%
High level cloud: 32%
Most Significant Cloud Type: low
70%
0.33 In
12:00

ESE
ESE

5 / 6 mph 54 / 53°F 75% 1027 mb
Low level cloud: 65%
Mid level cloud: 21%
High level cloud: 36%
Most Significant Cloud Type: low
77%
0.00 In
18:00

SSE
SSE

15 / 26 mph 48 / 42°F 83% 992 mb
Low level cloud: 4%
Mid level cloud: 40%
High level cloud: 33%
Most Significant Cloud Type: medium
51%
0.16 In
Wed 02
May
00:00

SSE
SSE

9 / 13 mph 48 / 44°F 88% 1029 mb
Low level cloud: 66%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
80%
0.02 In
06:00

SSE
SSE

14 / 23 mph 41 / 33°F 90% 994 mb
Low level cloud: 46%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.01 In
12:00

SSE
SSE

9 / 12 mph 56 / 54°F 74% 1029 mb
Low level cloud: 33%
Mid level cloud: 40%
High level cloud: 69%
Most Significant Cloud Type: low
54%
0.01 In
18:00

SSE
SSE

12 / 22 mph 49 / 44°F 83% 997 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 63%
Most Significant Cloud Type: medium
52%
0.22 In
Thu 03
May
00:00

SSE
SSE

7 / 9 mph 47 / 43°F 95% 1030 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 65%
Most Significant Cloud Type: medium
22%
0.01 In
06:00

S
S

12 / 20 mph 41 / 34°F 93% 999 mb
Low level cloud: 39%
Mid level cloud: 25%
High level cloud: 77%
Most Significant Cloud Type: low
56%
0.03 In
12:00

SE
SE

17 / 24 mph 53 / 48°F 55% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

SSW
SSW

14 / 27 mph 49 / 44°F 81% 999 mb
Low level cloud: 4%
Mid level cloud: 21%
High level cloud: 55%
Most Significant Cloud Type: medium
33%
0.25 In
Fri 04
May
00:00

ESE
ESE

10 / 13 mph 43 / 37°F 92% 1028 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 17%
Most Significant Cloud Type: low
7%
0.00 In
06:00

SW
SW

8 / 11 mph 44 / 39°F 94% 1009 mb
Low level cloud: 37%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.01 In
12:00

ESE
ESE

16 / 19 mph 49 / 43°F 65% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
17%
0.00 In
18:00

E
E

6 / 7 mph 58 / 57°F 75% 1014 mb
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 38%
Most Significant Cloud Type: low
24%
0.01 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