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Rayners Lane 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Rayners Lane

Hillingdon, United Kingdom

Long range weather outlook for Rayners Lane includes 14 day forecast summary:

Reviewing the forecast for Rayners Lane Over the next 14 days and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 21°C expected on the afternoon of Thursday 27th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 24th at 7°C. Expect the following 14 days ahead to have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The current forecast indicates Sunday 23rd will have the most precipitation with an accumulation of around 19.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 22
Sep
15:00

S
S

4 / 4 mph 56 / 56°F 76% 1017 mb
Low level cloud: 85%
Mid level cloud: 78%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
18:00

ESE
ESE

5 / 6 mph 56 / 55°F 82% 1015 mb
Low level cloud: 77%
Mid level cloud: 73%
High level cloud: 84%
Most Significant Cloud Type: low
100%
Expect 0.07 In of precipitation over the past 3 hours.
0.07 In
21:00

ENE
ENE

8 / 10 mph 55 / 53°F 84% 1014 mb
Low level cloud: 70%
Mid level cloud: 74%
High level cloud: 15%
Most Significant Cloud Type: low
97%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
Sun 23
Sep
00:00

NE
NE

7 / 13 mph 50 / 48°F 85% 1014 mb
Low level cloud: 85%
Mid level cloud: 78%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

NE
NE

7 / 14 mph 49 / 46°F 82% 1014 mb
Low level cloud: 85%
Mid level cloud: 61%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

8 / 16 mph 48 / 44°F 80% 1014 mb
Low level cloud: 86%
Mid level cloud: 67%
High level cloud: 77%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
09:00

NNE
NNE

13 / 15 mph 50 / 45°F 87% 1014 mb
Low level cloud: 96%
Mid level cloud: 86%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.39 In of precipitation over the past 3 hours.
0.39 In
12:00

N
N

13 / 15 mph 53 / 49°F 82% 1017 mb
Low level cloud: 70%
Mid level cloud: 94%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.28 In of precipitation over the past 3 hours.
0.28 In
15:00

NNW
NNW

12 / 14 mph 54 / 50°F 58% 1021 mb
Low level cloud: 4%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
18:00

NNW
NNW

9 / 12 mph 55 / 51°F 62% 1025 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNW
NNW

6 / 7 mph 53 / 51°F 73% 1029 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 24
Sep
00:00

NW
NW

5 / 6 mph 51 / 49°F 75% 1032 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
03:00

NW
NW

5 / 7 mph 48 / 45°F 77% 1034 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NW
NW

5 / 8 mph 46 / 44°F 81% 1036 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNW
NNW

6 / 8 mph 52 / 49°F 68% 1038 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

N
N

7 / 8 mph 58 / 56°F 48% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

N
N

7 / 8 mph 59 / 58°F 40% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNE
NNE

6 / 8 mph 57 / 55°F 41% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NE
NE

4 / 5 mph 54 / 54°F 41% 1040 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
Tue 25
Sep
00:00

ENE
ENE

2 / 4 mph 52 / 52°F 47% 1040 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
03:00

NE
NE

2 / 4 mph 50 / 50°F 51% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

ENE
ENE

3 / 5 mph 48 / 48°F 55% 1039 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
09:00

ESE
ESE

4 / 5 mph 55 / 54°F 50% 1039 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
12:00

SSE
SSE

5 / 6 mph 61 / 60°F 41% 1038 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
15:00

SSE
SSE

5 / 6 mph 63 / 62°F 41% 1036 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSE
SSE

4 / 5 mph 63 / 62°F 52% 1035 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

S
S

5 / 6 mph 57 / 56°F 59% 1035 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
Wed 26
Sep
00:00

SSW
SSW

2 / 3 mph 54 / 54°F 62% 1034 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
03:00

SSW
SSW

2 / 4 mph 51 / 51°F 65% 1033 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
06:00

SW
SW

3 / 5 mph 50 / 49°F 71% 1032 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
09:00

SW
SW

5 / 6 mph 57 / 56°F 60% 1032 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
12:00

SW
SW

7 / 8 mph 65 / 64°F 44% 1031 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
15:00

WSW
WSW

7 / 9 mph 68 / 67°F 40% 1029 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

SW
SW

6 / 8 mph 68 / 67°F 52% 1029 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

WSW
WSW

7 / 8 mph 61 / 61°F 62% 1030 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
Thu 27
Sep
00:00

WSW
WSW

7 / 9 mph 57 / 55°F 67% 1029 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

7 / 10 mph 54 / 52°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

7 / 12 mph 53 / 51°F 71% 1027 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

7 / 9 mph 60 / 59°F 68% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

10 / 11 mph 70 / 69°F 59% 1026 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NW
NW

10 / 12 mph 70 / 70°F 62% 1026 mb
Low level cloud: 87%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

N
N

10 / 13 mph 62 / 62°F 67% 1027 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NE
NE

9 / 11 mph 58 / 56°F 70% 1030 mb
Low level cloud: 8%
Mid level cloud: 12%
High level cloud: 93%
Most Significant Cloud Type: medium
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 28
Sep
00:00

NE
NE

7 / 9 mph 56 / 55°F 71% 1030 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

6 / 7 mph 54 / 52°F 72% 1029 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

NNE
NNE

4 / 6 mph 52 / 50°F 73% 1030 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 21%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNE
NNE

5 / 6 mph 56 / 54°F 56% 1030 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NNW
NNW

5 / 6 mph 61 / 59°F 48% 1030 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 69%
Most Significant Cloud Type: low
34%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NW
NW

6 / 7 mph 62 / 60°F 46% 1028 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 93%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNW
NNW

6 / 7 mph 60 / 58°F 50% 1028 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 16%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNW
NNW

6 / 7 mph 56 / 55°F 62% 1029 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 29
Sep
00:00

WNW
WNW

1 / 1 mph 64 / 64°F 48% 1031 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
06:00

WSW
WSW

10 / 13 mph 57 / 55°F 77% 1012 mb
Low level cloud: 29%
Mid level cloud: 69%
High level cloud: 39%
Most Significant Cloud Type: low
58%
0.00 In
12:00

WNW
WNW

8 / 9 mph 64 / 64°F 44% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.00 In
18:00

SW
SW

9 / 10 mph 69 / 69°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: medium
14%
0.00 In
Sun 30
Sep
00:00

SW
SW

8 / 9 mph 58 / 57°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.00 In
06:00

SW
SW

15 / 29 mph 52 / 47°F 83% 1009 mb
Low level cloud: 70%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.00 In
12:00

NW
NW

13 / 15 mph 58 / 55°F 57% 1019 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.01 In
18:00

WNW
WNW

14 / 16 mph 59 / 56°F 50% 1020 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
9%
0.00 In
Mon 01
Oct
00:00

NNW
NNW

10 / 12 mph 54 / 50°F 64% 1028 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.00 In
06:00

W
W

10 / 11 mph 49 / 45°F 79% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
12:00

WNW
WNW

1 / 1 mph 63 / 63°F 29% 1033 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
0.00 In
18:00

WSW
WSW

10 / 13 mph 56 / 53°F 70% 1025 mb
Low level cloud: 15%
Mid level cloud: 19%
High level cloud: 34%
Most Significant Cloud Type: low
25%
0.00 In
Tue 02
Oct
00:00

SW
SW

6 / 7 mph 55 / 54°F 54% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
06:00

WSW
WSW

17 / 26 mph 57 / 53°F 87% 1019 mb
Low level cloud: 66%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
70%
0.01 In
12:00

SW
SW

11 / 12 mph 63 / 63°F 51% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

WNW
WNW

9 / 10 mph 59 / 59°F 62% 1021 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
4%
0.01 In
Wed 03
Oct
00:00

SW
SW

6 / 6 mph 55 / 54°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
0.00 In
06:00

WSW
WSW

9 / 11 mph 48 / 44°F 86% 1020 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: medium
24%
0.00 In
12:00

W
W

11 / 12 mph 61 / 61°F 67% 1019 mb
Low level cloud: 44%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
51%
0.00 In
18:00

WNW
WNW

10 / 13 mph 55 / 52°F 66% 1020 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.03 In
Thu 04
Oct
00:00

N
N

3 / 4 mph 59 / 59°F 89% 1027 mb
Low level cloud: 15%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
18%
0.01 In
06:00

WSW
WSW

10 / 15 mph 46 / 41°F 93% 1020 mb
Low level cloud: 29%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: low
42%
0.00 In
12:00

WSW
WSW

14 / 16 mph 65 / 65°F 65% 1029 mb
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.00 In
18:00

WSW
WSW

23 / 36 mph 58 / 54°F 81% 1006 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
87%
0.06 In
Fri 05
Oct
00:00

W
W

11 / 15 mph 59 / 56°F 90% 1031 mb
Low level cloud: 25%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: low
28%
0.00 In
06:00

WNW
WNW

30 / 44 mph 50 / 42°F 61% 998 mb
Low level cloud: 66%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.09 In
12:00

WNW
WNW

9 / 11 mph 65 / 65°F 49% 1033 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 9%
Most Significant Cloud Type: medium
22%
0.00 In
18:00

NW
NW

17 / 27 mph 49 / 42°F 55% 1013 mb
Low level cloud: 8%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.00 In
Sat 06
Oct
00:00

NNW
NNW

6 / 7 mph 57 / 56°F 77% 1034 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: medium
21%
0.00 In
06:00

W
W

13 / 21 mph 43 / 36°F 74% 1015 mb
Low level cloud: 8%
Mid level cloud: 26%
High level cloud: 38%
Most Significant Cloud Type: medium
49%
0.00 In
12:00

NW
NW

5 / 6 mph 58 / 58°F 69% 1036 mb
Low level cloud: 72%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
90%
0.00 In
18:00

WSW
WSW

12 / 16 mph 49 / 44°F 81% 1006 mb
Low level cloud: 76%
Mid level cloud: 69%
High level cloud: 37%
Most Significant Cloud Type: low
100%
0.06 In
Sun 07
Oct
00:00

NE
NE

5 / 6 mph 54 / 53°F 84% 1037 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.02 In
06:00

WNW
WNW

13 / 18 mph 46 / 40°F 82% 1007 mb
Low level cloud: 17%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: low
33%
0.08 In
12:00

ESE
ESE

5 / 5 mph 63 / 63°F 52% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 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