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Harrow Weald 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Harrow Weald

Middlesex, United Kingdom

Long range weather outlook for Harrow Weald includes 14 day forecast summary:

Reviewing the forecast for Harrow Weald Over the next 14 days and the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 19°C expected on the afternoon of Saturday 25th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Saturday 1st at 6°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Predictions are Thursday 30th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 23
May		18:00

W
W

 10 / 13 mph 56 / 53°F 69% 1015 mb
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 8 / 11 mph 54 / 51°F 67% 1017 mb
Low level cloud: 74%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

WSW
WSW

 6 / 8 mph 52 / 49°F 79% 1017 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 6 / 7 mph 49 / 47°F 88% 1017 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 4 / 5 mph 49 / 47°F 78% 1019 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 5 / 7 mph 58 / 56°F 61% 1019 mb
Low level cloud: 11%
Mid level cloud: 2%
High level cloud: 14%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 6 / 8 mph 62 / 62°F 52% 1019 mb
Low level cloud: 95%
Mid level cloud: 9%
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

 5 / 7 mph 64 / 62°F 53% 1019 mb
Low level cloud: 71%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 2 / 2 mph 62 / 61°F 64% 1019 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 1 / 2 mph 58 / 57°F 75% 1019 mb
Low level cloud: 69%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May		00:00

E
E

 2 / 2 mph 56 / 56°F 82% 1019 mb
Low level cloud: 28%
Mid level cloud: 12%
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

E
E

 3 / 5 mph 53 / 53°F 87% 1019 mb
Low level cloud: 15%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 4 / 6 mph 54 / 52°F 79% 1019 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 5 / 6 mph 63 / 60°F 63% 1019 mb
Low level cloud: 32%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 8 / 9 mph 65 / 65°F 58% 1017 mb
Low level cloud: 84%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 8 / 11 mph 67 / 65°F 56% 1016 mb
Low level cloud: 38%
Mid level cloud: 1%
High level cloud: 87%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 9 / 12 mph 62 / 62°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 4 / 6 mph 59 / 56°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 86%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May		00:00

SSE
SSE

 4 / 7 mph 55 / 54°F 77% 1015 mb
Low level cloud: 70%
Mid level cloud: 50%
High level cloud: 91%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 7 / 10 mph 54 / 53°F 97% 1014 mb
Low level cloud: 28%
Mid level cloud: 70%
High level cloud: 7%
Most Significant Cloud Type: low
53%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SE
SE

 6 / 9 mph 56 / 53°F 97% 1013 mb
Low level cloud: 67%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 11 / 14 mph 61 / 60°F 79% 1013 mb
Low level cloud: 86%
Mid level cloud: 13%
High level cloud: 17%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 13 / 17 mph 66 / 65°F 61% 1013 mb
Low level cloud: 77%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 14 / 18 mph 67 / 66°F 53% 1013 mb
Low level cloud: 29%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 11 / 13 mph 65 / 64°F 65% 1014 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 7 / 10 mph 58 / 55°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		00:00

SSW
SSW

 7 / 9 mph 54 / 52°F 86% 1015 mb
Low level cloud: 13%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 5 / 7 mph 52 / 50°F 93% 1014 mb
Low level cloud: 38%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 6 / 8 mph 54 / 51°F 83% 1014 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 9 / 12 mph 59 / 59°F 61% 1014 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 13 mph 54 / 51°F 89% 1014 mb
Low level cloud: 70%
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
15:00

SW
SW

 8 / 12 mph 55 / 53°F 79% 1013 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 7 / 11 mph 58 / 56°F 71% 1013 mb
Low level cloud: 13%
Mid level cloud: 54%
High level cloud: 98%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 6 / 9 mph 56 / 53°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		00:00

SW
SW

 5 / 8 mph 51 / 50°F 90% 1015 mb
Low level cloud: 6%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 5 / 8 mph 49 / 47°F 93% 1015 mb
Low level cloud: 16%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 6 / 9 mph 52 / 48°F 85% 1016 mb
Low level cloud: 11%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 8 / 10 mph 62 / 60°F 66% 1017 mb
Low level cloud: 33%
Mid level cloud: 13%
High level cloud: 87%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 11 / 13 mph 63 / 63°F 54% 1016 mb
Low level cloud: 15%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 11 / 15 mph 58 / 54°F 87% 1017 mb
Low level cloud: 32%
Mid level cloud: 91%
High level cloud: 9%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 10 / 14 mph 55 / 52°F 89% 1017 mb
Low level cloud: 92%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 10 / 14 mph 54 / 51°F 84% 1016 mb
Low level cloud: 53%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		00:00

SSW
SSW

 11 / 17 mph 55 / 52°F 89% 1014 mb
Low level cloud: 99%
Mid level cloud: 86%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 12 / 19 mph 55 / 52°F 92% 1012 mb
Low level cloud: 100%
Mid level cloud: 18%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 10 / 16 mph 56 / 54°F 95% 1011 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 17 mph 62 / 61°F 72% 1011 mb
Low level cloud: 84%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 16 / 19 mph 67 / 65°F 63% 1010 mb
Low level cloud: 47%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 15 / 20 mph 65 / 64°F 72% 1009 mb
Low level cloud: 55%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 11 / 15 mph 63 / 61°F 81% 1008 mb
Low level cloud: 24%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 10 / 14 mph 57 / 53°F 90% 1009 mb
Low level cloud: 42%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
53%
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
May		00:00

SW
SW

 9 / 15 mph 56 / 54°F 86% 1014 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
47%
0.0 In
06:00

S
S

 4 / 7 mph 56 / 56°F 92% 1011 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
12:00

WNW
WNW

 6 / 14 mph 64 / 64°F 70% 1012 mb
Low level cloud: 56%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
18:00

SSE
SSE

 6 / 13 mph 71 / 71°F 71% 1008 mb
Low level cloud: 7%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
46%
0.0 In
Fri 31
May		00:00

SE
SE

 4 / 8 mph 62 / 62°F 83% 1009 mb
Low level cloud: 69%
Mid level cloud: 32%
High level cloud: 11%
Most Significant Cloud Type: low
81%
0.0 In
06:00

SSW
SSW

 6 / 12 mph 55 / 53°F 93% 1005 mb
Low level cloud: 48%
Mid level cloud: 11%
High level cloud: 30%
Most Significant Cloud Type: low
55%
0.0 In
12:00

W
W

 11 / 22 mph 61 / 61°F 71% 1009 mb
Low level cloud: 67%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
18:00

N
N

 12 / 25 mph 64 / 64°F 85% 1014 mb
Low level cloud: 41%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
Sat 01
Jun		00:00

WNW
WNW

 11 / 24 mph 49 / 45°F 89% 1010 mb
Low level cloud: 21%
Mid level cloud: 29%
High level cloud: 15%
Most Significant Cloud Type: low
32%
0.0 In
06:00

N
N

 11 / 22 mph 53 / 49°F 87% 1019 mb
Low level cloud: 92%
Mid level cloud: 20%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 14 / 30 mph 59 / 56°F 47% 1012 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
67%
0.0 In
18:00

N
N

 7 / 15 mph 59 / 59°F 70% 1022 mb
Low level cloud: 74%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
76%
0.0 In
Sun 02
Jun		00:00

WSW
WSW

 6 / 13 mph 50 / 48°F 84% 1010 mb
Low level cloud: 10%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
79%
0.0 In
06:00

N
N

 5 / 10 mph 57 / 57°F 82% 1023 mb
Low level cloud: 9%
Mid level cloud: 16%
High level cloud: 17%
Most Significant Cloud Type: low
16%
0.0 In
12:00

WNW
WNW

 10 / 21 mph 57 / 54°F 64% 1015 mb
Low level cloud: 66%
Mid level cloud: 72%
High level cloud: 3%
Most Significant Cloud Type: low
91%
0.0 In
18:00

ENE
ENE

 4 / 10 mph 69 / 69°F 59% 1023 mb
Low level cloud: 11%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Mon 03
Jun		00:00

WSW
WSW

 5 / 10 mph 53 / 51°F 92% 1016 mb
Low level cloud: 48%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
50%
0.0 In
06:00

W
W

 5 / 10 mph 55 / 54°F 81% 1023 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
12:00

WSW
WSW

 14 / 29 mph 58 / 56°F 68% 1012 mb
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 6 / 12 mph 61 / 61°F 81% 1022 mb
Low level cloud: 94%
Mid level cloud: 23%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
Tue 04
Jun		00:00

SW
SW

 8 / 17 mph 53 / 50°F 94% 1010 mb
Low level cloud: 35%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.1 In
06:00

WSW
WSW

 5 / 10 mph 60 / 60°F 88% 1021 mb
Low level cloud: 29%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
12:00

WSW
WSW

 13 / 28 mph 58 / 56°F 55% 1011 mb
Low level cloud: 73%
Mid level cloud: 57%
High level cloud: 1%
Most Significant Cloud Type: low
92%
0.0 In
18:00

W
W

 8 / 17 mph 75 / 78°F 63% 1018 mb
Low level cloud: 19%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: low
22%
0.0 In
Wed 05
Jun		00:00

WSW
WSW

 7 / 14 mph 56 / 55°F 86% 1014 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

W
W

 5 / 10 mph 64 / 64°F 78% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
12:00

WNW
WNW

 7 / 15 mph 64 / 64°F 50% 1016 mb
Low level cloud: 62%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
18:00

NE
NE

 3 / 7 mph 67 / 67°F 84% 1012 mb
Low level cloud: 90%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 06
Jun		00:00

W
W

 4 / 9 mph 62 / 62°F 85% 1018 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
06:00

ENE
ENE

 7 / 15 mph 56 / 55°F 97% 1008 mb
Low level cloud: 84%
Mid level cloud: 76%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.2 In
12:00

W
W

 7 / 14 mph 67 / 67°F 44% 1017 mb
Low level cloud: 5%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NNW
NNW

 8 / 17 mph 57 / 55°F 77% 1010 mb
Low level cloud: 23%
Mid level cloud: 28%
High level cloud: 77%
Most Significant Cloud Type: low
41%
0.1 In
Fri 07
Jun		00:00

NNW
NNW

 6 / 12 mph 54 / 53°F 80% 1017 mb
Low level cloud: 66%
Mid level cloud: 60%
High level cloud: 10%
Most Significant Cloud Type: low
88%
0.0 In
06:00

WSW
WSW

 9 / 19 mph 49 / 45°F 74% 1013 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
12:00

WNW
WNW

 12 / 25 mph 60 / 60°F 56% 1016 mb
Low level cloud: 56%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
18:00

W
W

 10 / 21 mph 56 / 54°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.1 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