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Allendale Town 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Allendale Town

Northumberland, United Kingdom

Long range weather outlook for Allendale Town includes 14 day forecast summary:

The next 14 day outlook for Allendale Town shows the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 15°C expected on the afternoon of Friday 31st. The average minimum temperature will be 6°C, dipping to its lowest on the morning of Sunday 26th at 0°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Friday 31st will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the morning of Sunday 2nd, coming from a south westerly direction, and reaching around 40mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 23
Oct
15:00

NW
NW

14 / 16 mph 49 / 43°F 76% 990 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 72%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

17 / 22 mph 46 / 39°F 70% 992 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

16 / 28 mph 40 / 31°F 81% 993 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
Oct
00:00

W
W

17 / 29 mph 40 / 31°F 90% 993 mb
Low level cloud: 20%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

15 / 26 mph 41 / 33°F 92% 993 mb
Low level cloud: 30%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

15 / 24 mph 41 / 33°F 92% 992 mb
Low level cloud: 38%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

15 / 17 mph 45 / 39°F 84% 993 mb
Low level cloud: 19%
Mid level cloud: 100%
High level cloud: 42%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

16 / 18 mph 50 / 44°F 75% 993 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

17 / 19 mph 45 / 38°F 92% 992 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WNW
WNW

15 / 20 mph 47 / 40°F 90% 994 mb
Low level cloud: 99%
Mid level cloud: 87%
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

NW
NW

19 / 23 mph 46 / 39°F 88% 996 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
Oct
00:00

NW
NW

17 / 23 mph 45 / 37°F 81% 998 mb
Low level cloud: 64%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

15 / 20 mph 43 / 36°F 79% 1000 mb
Low level cloud: 99%
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
06:00

WNW
WNW

15 / 20 mph 41 / 33°F 80% 1002 mb
Low level cloud: 83%
Mid level cloud: 98%
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

WNW
WNW

16 / 18 mph 43 / 35°F 73% 1004 mb
Low level cloud: 35%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

17 / 20 mph 47 / 40°F 64% 1005 mb
Low level cloud: 68%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

15 / 17 mph 46 / 40°F 61% 1005 mb
Low level cloud: 9%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

15 / 23 mph 40 / 32°F 69% 1006 mb
Low level cloud: 7%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

15 / 24 mph 38 / 29°F 73% 1007 mb
Low level cloud: 7%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
Oct
00:00

WNW
WNW

16 / 26 mph 37 / 28°F 72% 1007 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

15 / 27 mph 34 / 24°F 80% 1008 mb
Low level cloud: 5%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

13 / 26 mph 33 / 24°F 87% 1008 mb
Low level cloud: 4%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

13 / 17 mph 40 / 32°F 76% 1008 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

16 / 19 mph 48 / 41°F 65% 1007 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

15 / 17 mph 43 / 36°F 88% 1005 mb
Low level cloud: 97%
Mid level cloud: 56%
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

10 / 17 mph 44 / 38°F 92% 1000 mb
Low level cloud: 93%
Mid level cloud: 32%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

21 / 30 mph 47 / 40°F 85% 999 mb
Low level cloud: 87%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
Oct
00:00

W
W

20 / 28 mph 46 / 38°F 85% 998 mb
Low level cloud: 90%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

18 / 23 mph 45 / 38°F 91% 996 mb
Low level cloud: 92%
Mid level cloud: 60%
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

13 / 16 mph 45 / 39°F 91% 998 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

NW
NW

14 / 16 mph 43 / 36°F 84% 1004 mb
Low level cloud: 92%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

17 / 20 mph 48 / 41°F 72% 1006 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

17 / 20 mph 47 / 40°F 67% 1009 mb
Low level cloud: 9%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

12 / 23 mph 40 / 33°F 73% 1012 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

10 / 21 mph 36 / 29°F 80% 1015 mb
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
Tue 28
Oct
00:00

W
W

9 / 18 mph 34 / 27°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

8 / 16 mph 33 / 26°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

7 / 15 mph 34 / 28°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 94%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

10 / 13 mph 45 / 40°F 78% 1015 mb
Low level cloud: 48%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

13 / 18 mph 47 / 42°F 89% 1013 mb
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

19 / 23 mph 52 / 46°F 84% 1012 mb
Low level cloud: 79%
Mid level cloud: 70%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

18 / 24 mph 51 / 45°F 85% 1011 mb
Low level cloud: 98%
Mid level cloud: 17%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

18 / 25 mph 50 / 44°F 87% 1011 mb
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
Oct
00:00

WSW
WSW

15 / 23 mph 50 / 44°F 84% 1010 mb
Low level cloud: 84%
Mid level cloud: 35%
High level cloud: 32%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

17 / 30 mph 48 / 41°F 87% 1010 mb
Low level cloud: 58%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

16 / 28 mph 47 / 40°F 89% 1011 mb
Low level cloud: 26%
Mid level cloud: 31%
High level cloud: 33%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

12 / 16 mph 50 / 46°F 85% 1012 mb
Low level cloud: 21%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

13 / 16 mph 54 / 50°F 83% 1012 mb
Low level cloud: 69%
Mid level cloud: 41%
High level cloud: 73%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

11 / 12 mph 56 / 53°F 84% 1012 mb
Low level cloud: 55%
Mid level cloud: 28%
High level cloud: 91%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

11 / 13 mph 54 / 50°F 83% 1013 mb
Low level cloud: 16%
Mid level cloud: 91%
High level cloud: 96%
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 / 11 mph 51 / 48°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 30
Oct
00:00

SSW
SSW

12 / 18 mph 50 / 46°F 88% 1012 mb
Low level cloud: 67%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.0 In
06:00

SW
SW

6 / 10 mph 47 / 44°F 91% 1028 mb
Low level cloud: 62%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: low
74%
0.0 In
12:00

S
S

21 / 31 mph 61 / 61°F 79% 994 mb
Low level cloud: 93%
Mid level cloud: 26%
High level cloud: 60%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

11 / 15 mph 50 / 46°F 81% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Fri 31
Oct
00:00

SSE
SSE

9 / 19 mph 43 / 37°F 92% 1008 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
06:00

SW
SW

15 / 28 mph 45 / 38°F 83% 999 mb
Low level cloud: 18%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SSW
SSW

13 / 18 mph 53 / 49°F 82% 1003 mb
Low level cloud: 50%
Mid level cloud: 71%
High level cloud: 78%
Most Significant Cloud Type: low
84%
0.0 In
18:00

SW
SW

13 / 19 mph 56 / 53°F 87% 993 mb
Low level cloud: 71%
Mid level cloud: 81%
High level cloud: 38%
Most Significant Cloud Type: low
100%
0.0 In
Sat 01
Nov
00:00

SW
SW

5 / 9 mph 50 / 48°F 89% 1001 mb
Low level cloud: 61%
Mid level cloud: 95%
High level cloud: 22%
Most Significant Cloud Type: low
97%
0.1 In
06:00

WNW
WNW

7 / 12 mph 47 / 43°F 92% 989 mb
Low level cloud: 49%
Mid level cloud: 55%
High level cloud: 44%
Most Significant Cloud Type: low
73%
0.4 In
12:00

W
W

15 / 25 mph 51 / 46°F 82% 1000 mb
Low level cloud: 43%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
58%
0.2 In
18:00

E
E

17 / 27 mph 53 / 48°F 95% 992 mb
Low level cloud: 99%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sun 02
Nov
00:00

W
W

11 / 20 mph 41 / 35°F 92% 1005 mb
Low level cloud: 18%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
06:00

SSW
SSW

40 / 68 mph 50 / 40°F 68% 981 mb
Low level cloud: 43%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.1 In
12:00

WSW
WSW

5 / 9 mph 52 / 50°F 71% 1006 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
14%
0.0 In
18:00

WSW
WSW

34 / 57 mph 53 / 45°F 80% 991 mb
Low level cloud: 81%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
Mon 03
Nov
00:00

E
E

7 / 15 mph 40 / 35°F 92% 999 mb
Low level cloud: 32%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
60%
0.0 In
06:00

NNE
NNE

2 / 3 mph 38 / 38°F 89% 1011 mb
Low level cloud: 25%
Mid level cloud: 12%
High level cloud: 73%
Most Significant Cloud Type: low
37%
0.1 In
12:00

ENE
ENE

17 / 30 mph 51 / 45°F 80% 995 mb
Low level cloud: 55%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
68%
0.0 In
18:00

N
N

6 / 11 mph 42 / 37°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
0.0 In
Tue 04
Nov
00:00

NE
NE

4 / 7 mph 44 / 42°F 96% 1000 mb
Low level cloud: 74%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
88%
0.0 In
06:00

ESE
ESE

2 / 5 mph 32 / 31°F 79% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
12:00

SE
SE

13 / 24 mph 52 / 47°F 83% 998 mb
Low level cloud: 63%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

21 / 36 mph 43 / 35°F 96% 1005 mb
Low level cloud: 93%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
Wed 05
Nov
00:00

ESE
ESE

10 / 18 mph 45 / 40°F 97% 990 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
06:00

SSE
SSE

12 / 22 mph 44 / 38°F 86% 997 mb
Low level cloud: 18%
Mid level cloud: 79%
High level cloud: 65%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

W
W

24 / 45 mph 49 / 41°F 90% 983 mb
Low level cloud: 65%
Mid level cloud: 97%
High level cloud: 59%
Most Significant Cloud Type: low
100%
1.1 In
18:00

SW
SW

20 / 36 mph 46 / 38°F 84% 984 mb
Low level cloud: 79%
Mid level cloud: 29%
High level cloud: 80%
Most Significant Cloud Type: low
98%
0.4 In
Thu 06
Nov
00:00

SE
SE

16 / 30 mph 48 / 42°F 89% 981 mb
Low level cloud: 85%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

27 / 48 mph 44 / 34°F 84% 986 mb
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
12:00

S
S

14 / 27 mph 50 / 45°F 74% 972 mb
Low level cloud: 29%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
56%
0.1 In
18:00

W
W

14 / 26 mph 37 / 28°F 77% 1003 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Fri 07
Nov
00:00

SSW
SSW

17 / 34 mph 48 / 42°F 74% 975 mb
Low level cloud: 42%
Mid level cloud: 44%
High level cloud: 30%
Most Significant Cloud Type: low
61%
0.0 In
06:00

W
W

11 / 23 mph 32 / 23°F 88% 1010 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
0.0 In
12:00

SW
SW

13 / 25 mph 52 / 48°F 76% 981 mb
Low level cloud: 40%
Mid level cloud: 86%
High level cloud: 16%
Most Significant Cloud Type: low
72%
0.0 In
18:00

W
W

6 / 11 mph 40 / 36°F 89% 1018 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
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