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West End, Hertfordshire 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for West End, Hertfordshire

Hertfordshire, United Kingdom

Long range weather outlook for West End, Hertfordshire includes 14 day forecast summary:

The outlook for West End, Hertfordshire in the two weeks ahead shows the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 17°C expected on the afternoon of Thursday 6th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Saturday 15th at 7°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Current predictions suggest Thursday 13th will have the most precipitation with an accumulation of around 23.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 05
Nov
15:00

SSE
SSE

14 / 19 mph 61 / 61°F 71% 1007 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

12 / 15 mph 60 / 60°F 71% 1007 mb
Low level cloud: 0%
Mid level cloud: 52%
High level cloud: 13%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

9 / 14 mph 59 / 59°F 69% 1007 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 15%
Most Significant Cloud Type: medium
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Nov
00:00

SSE
SSE

10 / 18 mph 58 / 56°F 67% 1007 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

10 / 19 mph 57 / 55°F 74% 1006 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

8 / 16 mph 56 / 54°F 84% 1007 mb
Low level cloud: 2%
Mid level cloud: 74%
High level cloud: 74%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

9 / 12 mph 59 / 57°F 92% 1008 mb
Low level cloud: 49%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

10 / 14 mph 62 / 61°F 78% 1007 mb
Low level cloud: 57%
Mid level cloud: 26%
High level cloud: 97%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

6 / 8 mph 63 / 63°F 78% 1007 mb
Low level cloud: 72%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

5 / 6 mph 62 / 62°F 84% 1008 mb
Low level cloud: 86%
Mid level cloud: 28%
High level cloud: 70%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

5 / 6 mph 60 / 60°F 92% 1008 mb
Low level cloud: 42%
Mid level cloud: 65%
High level cloud: 7%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Nov
00:00

SSE
SSE

4 / 7 mph 55 / 55°F 94% 1007 mb
Low level cloud: 50%
Mid level cloud: 65%
High level cloud: 10%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

6 / 13 mph 53 / 51°F 95% 1007 mb
Low level cloud: 68%
Mid level cloud: 92%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

6 / 13 mph 52 / 50°F 97% 1006 mb
Low level cloud: 71%
Mid level cloud: 43%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

8 / 12 mph 55 / 53°F 93% 1007 mb
Low level cloud: 71%
Mid level cloud: 23%
High level cloud: 95%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

11 / 17 mph 59 / 56°F 75% 1005 mb
Low level cloud: 82%
Mid level cloud: 20%
High level cloud: 12%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

12 / 14 mph 60 / 60°F 76% 1005 mb
Low level cloud: 86%
Mid level cloud: 36%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

10 / 11 mph 59 / 59°F 87% 1007 mb
Low level cloud: 69%
Mid level cloud: 12%
High level cloud: 40%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

8 / 10 mph 56 / 55°F 91% 1008 mb
Low level cloud: 56%
Mid level cloud: 54%
High level cloud: 79%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Nov
00:00

SSE
SSE

10 / 15 mph 56 / 53°F 88% 1008 mb
Low level cloud: 90%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

8 / 13 mph 52 / 49°F 94% 1009 mb
Low level cloud: 46%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

12 / 17 mph 51 / 47°F 89% 1011 mb
Low level cloud: 100%
Mid level cloud: 1%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

12 / 17 mph 54 / 51°F 72% 1013 mb
Low level cloud: 96%
Mid level cloud: 4%
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

WSW
WSW

15 / 18 mph 56 / 52°F 67% 1014 mb
Low level cloud: 40%
Mid level cloud: 5%
High level cloud: 19%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

12 / 17 mph 56 / 52°F 70% 1015 mb
Low level cloud: 45%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

7 / 11 mph 52 / 49°F 82% 1016 mb
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
21:00

WSW
WSW

8 / 14 mph 49 / 45°F 90% 1017 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 09
Nov
00:00

SW
SW

7 / 12 mph 47 / 44°F 92% 1017 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

7 / 12 mph 46 / 43°F 92% 1017 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

7 / 13 mph 46 / 42°F 95% 1017 mb
Low level cloud: 50%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

7 / 11 mph 50 / 47°F 91% 1017 mb
Low level cloud: 65%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

9 / 11 mph 57 / 54°F 79% 1017 mb
Low level cloud: 44%
Mid level cloud: 24%
High level cloud: 15%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

8 / 12 mph 57 / 55°F 77% 1016 mb
Low level cloud: 27%
Mid level cloud: 29%
High level cloud: 20%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

8 / 14 mph 53 / 50°F 91% 1017 mb
Low level cloud: 11%
Mid level cloud: 35%
High level cloud: 10%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 13 mph 52 / 49°F 94% 1017 mb
Low level cloud: 25%
Mid level cloud: 40%
High level cloud: 41%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 10
Nov
00:00

S
S

8 / 13 mph 51 / 48°F 96% 1016 mb
Low level cloud: 38%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

9 / 17 mph 50 / 46°F 97% 1015 mb
Low level cloud: 62%
Mid level cloud: 44%
High level cloud: 83%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

10 / 18 mph 49 / 45°F 96% 1014 mb
Low level cloud: 66%
Mid level cloud: 47%
High level cloud: 91%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

11 / 19 mph 52 / 47°F 89% 1014 mb
Low level cloud: 50%
Mid level cloud: 48%
High level cloud: 9%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

12 / 19 mph 54 / 50°F 85% 1013 mb
Low level cloud: 84%
Mid level cloud: 100%
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

S
S

11 / 13 mph 55 / 52°F 93% 1012 mb
Low level cloud: 86%
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

S
S

11 / 13 mph 54 / 51°F 93% 1013 mb
Low level cloud: 77%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

S
S

8 / 11 mph 52 / 49°F 94% 1013 mb
Low level cloud: 97%
Mid level cloud: 96%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 11
Nov
00:00

S
S

11 / 17 mph 50 / 46°F 91% 1013 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 63%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

S
S

9 / 14 mph 49 / 46°F 91% 1012 mb
Low level cloud: 96%
Mid level cloud: 80%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

7 / 11 mph 49 / 46°F 89% 1012 mb
Low level cloud: 87%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

5 / 8 mph 50 / 48°F 87% 1011 mb
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

7 / 9 mph 52 / 49°F 80% 1011 mb
Low level cloud: 44%
Mid level cloud: 31%
High level cloud: 3%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

5 / 7 mph 53 / 51°F 82% 1009 mb
Low level cloud: 58%
Mid level cloud: 24%
High level cloud: 14%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

5 / 6 mph 52 / 51°F 91% 1009 mb
Low level cloud: 40%
Mid level cloud: 25%
High level cloud: 16%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

4 / 5 mph 51 / 51°F 91% 1009 mb
Low level cloud: 39%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 12
Nov
00:00

E
E

6 / 10 mph 47 / 44°F 90% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
06:00

ENE
ENE

7 / 12 mph 46 / 42°F 96% 1017 mb
Low level cloud: 47%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: low
51%
0.0 In
12:00

E
E

11 / 18 mph 51 / 46°F 86% 1015 mb
Low level cloud: 85%
Mid level cloud: 60%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

9 / 13 mph 53 / 50°F 85% 1029 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
Thu 13
Nov
00:00

NE
NE

9 / 15 mph 45 / 41°F 94% 1014 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: low
23%
0.0 In
06:00

E
E

15 / 26 mph 49 / 44°F 97% 1002 mb
Low level cloud: 96%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

12 / 20 mph 46 / 41°F 57% 994 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 3%
Most Significant Cloud Type: medium
34%
0.0 In
18:00

SE
SE

4 / 5 mph 55 / 55°F 98% 998 mb
Low level cloud: 48%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 14
Nov
00:00

S
S

13 / 21 mph 43 / 36°F 81% 993 mb
Low level cloud: 71%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

9 / 19 mph 45 / 40°F 94% 999 mb
Low level cloud: 94%
Mid level cloud: 43%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

18 / 30 mph 50 / 44°F 76% 999 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 18%
Most Significant Cloud Type: low
44%
0.1 In
18:00

NNE
NNE

19 / 27 mph 49 / 42°F 86% 1003 mb
Low level cloud: 100%
Mid level cloud: 8%
High level cloud: 50%
Most Significant Cloud Type: low
100%
0.0 In
Sat 15
Nov
00:00

WNW
WNW

5 / 9 mph 48 / 46°F 89% 1003 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

NNE
NNE

15 / 28 mph 41 / 33°F 70% 1009 mb
Low level cloud: 57%
Mid level cloud: 16%
High level cloud: 20%
Most Significant Cloud Type: low
65%
0.0 In
12:00

W
W

14 / 23 mph 47 / 40°F 82% 1009 mb
Low level cloud: 52%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
18:00

N
N

12 / 17 mph 46 / 40°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
Sun 16
Nov
00:00

SW
SW

11 / 19 mph 46 / 40°F 87% 1013 mb
Low level cloud: 90%
Mid level cloud: 30%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

12 / 19 mph 34 / 26°F 85% 1023 mb
Low level cloud: 88%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
12:00

W
W

12 / 21 mph 56 / 53°F 77% 1015 mb
Low level cloud: 35%
Mid level cloud: 13%
High level cloud: 16%
Most Significant Cloud Type: low
41%
0.0 In
18:00

NNW
NNW

13 / 19 mph 40 / 33°F 85% 1029 mb
Low level cloud: 6%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: medium
37%
0.0 In
Mon 17
Nov
00:00

SW
SW

18 / 30 mph 55 / 51°F 95% 1013 mb
Low level cloud: 93%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

10 / 18 mph 34 / 26°F 88% 1033 mb
Low level cloud: 9%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
12:00

WSW
WSW

26 / 45 mph 58 / 53°F 81% 1004 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

N
N

6 / 9 mph 43 / 39°F 93% 1037 mb
Low level cloud: 13%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Tue 18
Nov
00:00

WSW
WSW

18 / 32 mph 46 / 39°F 72% 1009 mb
Low level cloud: 39%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

W
W

3 / 5 mph 40 / 38°F 91% 1037 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
0.0 In
12:00

WSW
WSW

16 / 28 mph 50 / 44°F 77% 1005 mb
Low level cloud: 92%
Mid level cloud: 26%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

5 / 7 mph 42 / 39°F 79% 1035 mb
Low level cloud: 2%
Mid level cloud: 78%
High level cloud: 96%
Most Significant Cloud Type: medium
88%
0.0 In
Wed 19
Nov
00:00

W
W

11 / 19 mph 43 / 38°F 86% 1003 mb
Low level cloud: 20%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

SSW
SSW

8 / 15 mph 39 / 33°F 86% 1032 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
12:00

WSW
WSW

9 / 16 mph 45 / 40°F 75% 1002 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

9 / 13 mph 43 / 38°F 80% 1029 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 22%
Most Significant Cloud Type: medium
29%
0.0 In
Thu 20
Nov
00:00

E
E

4 / 7 mph 44 / 42°F 85% 1003 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
33%
0.0 In
06:00

S
S

10 / 17 mph 38 / 31°F 64% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 67%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

E
E

6 / 12 mph 47 / 44°F 79% 1004 mb
Low level cloud: 84%
Mid level cloud: 33%
High level cloud: 12%
Most Significant Cloud Type: low
96%
0.0 In
18:00

SSW
SSW

16 / 26 mph 42 / 35°F 85% 1018 mb
Low level cloud: 91%
Mid level cloud: 45%
High level cloud: 91%
Most Significant Cloud Type: low
100%
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