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Helperthorpe 14 Day Long Range Forecast

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

North Yorkshire, United Kingdom

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

Taking a look at Helperthorpe over the coming two weeks 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 Wednesday 26th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Wednesday 19th at 8°C. Expect the coming 14 days to have mixed weather with some days dry and some seeing a little rain. Current predictions suggest Monday 17th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 17
Jun		18:00

SSW
SSW

 1 / 1 mph 61 / 59°F 84% 1010 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

 4 / 6 mph 56 / 54°F 92% 1011 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun		00:00

W
W

 5 / 10 mph 51 / 50°F 93% 1012 mb
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 10%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 5 / 11 mph 50 / 49°F 92% 1013 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 33%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 6 / 9 mph 53 / 51°F 90% 1013 mb
Low level cloud: 19%
Mid level cloud: 94%
High level cloud: 16%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 5 / 7 mph 57 / 56°F 84% 1015 mb
Low level cloud: 93%
Mid level cloud: 13%
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

NNE
NNE

 13 / 18 mph 55 / 51°F 87% 1016 mb
Low level cloud: 76%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 13 / 17 mph 57 / 53°F 79% 1017 mb
Low level cloud: 60%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 13 / 19 mph 55 / 51°F 85% 1018 mb
Low level cloud: 40%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 9 / 15 mph 51 / 46°F 96% 1020 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Jun		00:00

N
N

 10 / 17 mph 48 / 44°F 96% 1020 mb
Low level cloud: 47%
Mid level cloud: 9%
High level cloud: 10%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 13 mph 47 / 44°F 95% 1021 mb
Low level cloud: 43%
Mid level cloud: 12%
High level cloud: 17%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 6 / 8 mph 52 / 48°F 89% 1021 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 1 / 2 mph 57 / 55°F 74% 1022 mb
Low level cloud: 29%
Mid level cloud: 5%
High level cloud: 76%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 4 / 5 mph 61 / 60°F 69% 1022 mb
Low level cloud: 82%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 5 / 8 mph 63 / 61°F 70% 1021 mb
Low level cloud: 75%
Mid level cloud: 12%
High level cloud: 37%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 6 / 9 mph 64 / 62°F 77% 1021 mb
Low level cloud: 16%
Mid level cloud: 9%
High level cloud: 36%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 5 / 10 mph 58 / 55°F 90% 1022 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 11%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Jun		00:00

SW
SW

 6 / 11 mph 53 / 51°F 91% 1022 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 24%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 10 mph 52 / 50°F 87% 1021 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 4 / 6 mph 56 / 53°F 80% 1021 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 5 / 7 mph 60 / 58°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 4 / 5 mph 66 / 63°F 60% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 8 / 11 mph 66 / 63°F 70% 1019 mb
Low level cloud: 16%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 9 / 14 mph 61 / 60°F 78% 1019 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 22%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 7 / 13 mph 56 / 52°F 81% 1019 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Jun		00:00

SSE
SSE

 4 / 8 mph 52 / 51°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 2 / 4 mph 51 / 51°F 84% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 9 mph 55 / 53°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 11 / 16 mph 59 / 55°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 9 / 14 mph 54 / 50°F 93% 1011 mb
Low level cloud: 40%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NNE
NNE

 13 / 19 mph 57 / 53°F 87% 1009 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
74%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNW
NNW

 9 / 13 mph 56 / 54°F 89% 1009 mb
Low level cloud: 82%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 7 / 12 mph 56 / 52°F 92% 1009 mb
Low level cloud: 8%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Jun		00:00

W
W

 6 / 11 mph 53 / 51°F 90% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 7 / 15 mph 51 / 48°F 91% 1008 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 9 / 13 mph 55 / 52°F 89% 1008 mb
Low level cloud: 64%
Mid level cloud: 57%
High level cloud: 12%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 12 / 18 mph 56 / 53°F 92% 1009 mb
Low level cloud: 92%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 10 / 15 mph 56 / 53°F 93% 1010 mb
Low level cloud: 95%
Mid level cloud: 98%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 8 / 12 mph 59 / 56°F 85% 1011 mb
Low level cloud: 56%
Mid level cloud: 71%
High level cloud: 82%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 13 / 20 mph 61 / 60°F 79% 1011 mb
Low level cloud: 31%
Mid level cloud: 26%
High level cloud: 6%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 10 / 19 mph 55 / 51°F 90% 1013 mb
Low level cloud: 14%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Jun		00:00

W
W

 9 / 18 mph 51 / 47°F 93% 1013 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

 8 / 16 mph 50 / 47°F 91% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 6 / 11 mph 54 / 51°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 8 / 11 mph 62 / 60°F 69% 1015 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 4 / 6 mph 64 / 64°F 64% 1015 mb
Low level cloud: 95%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 5 / 7 mph 61 / 60°F 75% 1016 mb
Low level cloud: 69%
Mid level cloud: 53%
High level cloud: 6%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 6 / 9 mph 61 / 59°F 80% 1017 mb
Low level cloud: 68%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 4 / 8 mph 57 / 55°F 87% 1018 mb
Low level cloud: 13%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Jun		00:00

SW
SW

 1 / 2 mph 56 / 56°F 91% 1020 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

NNW
NNW

 13 / 27 mph 52 / 48°F 87% 1016 mb
Low level cloud: 77%
Mid level cloud: 15%
High level cloud: 14%
Most Significant Cloud Type: low
83%
0.0 In
12:00

WSW
WSW

 17 / 35 mph 66 / 66°F 74% 1015 mb
Low level cloud: 89%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 9 / 19 mph 70 / 70°F 83% 1012 mb
Low level cloud: 44%
Mid level cloud: 24%
High level cloud: 91%
Most Significant Cloud Type: low
62%
0.0 In
Tue 25
Jun		00:00

S
S

 6 / 12 mph 55 / 54°F 94% 1023 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
06:00

WSW
WSW

 6 / 12 mph 60 / 60°F 86% 1016 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

SE
SE

 11 / 22 mph 66 / 66°F 74% 1016 mb
Low level cloud: 57%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
18:00

ESE
ESE

 7 / 15 mph 62 / 62°F 71% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 15%
Most Significant Cloud Type: high
15%
0.0 In
Wed 26
Jun		00:00

S
S

 3 / 5 mph 57 / 58°F 88% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

WNW
WNW

 1 / 3 mph 59 / 59°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

ESE
ESE

 6 / 13 mph 66 / 66°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ENE
ENE

 6 / 12 mph 61 / 61°F 69% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
0.0 In
Thu 27
Jun		00:00

ENE
ENE

 2 / 4 mph 58 / 60°F 80% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

N
N

 4 / 9 mph 58 / 58°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

E
E

 7 / 14 mph 64 / 64°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ESE
ESE

 6 / 11 mph 61 / 61°F 70% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 52%
Most Significant Cloud Type: high
51%
0.0 In
Fri 28
Jun		00:00

ESE
ESE

 4 / 7 mph 60 / 60°F 92% 1020 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
06:00

SW
SW

 4 / 9 mph 60 / 60°F 76% 1019 mb
Low level cloud: 11%
Mid level cloud: 16%
High level cloud: 41%
Most Significant Cloud Type: low
21%
0.0 In
12:00

ENE
ENE

 8 / 15 mph 67 / 67°F 75% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SE
SE

 7 / 14 mph 64 / 64°F 76% 1018 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
Sat 29
Jun		00:00

NE
NE

 4 / 8 mph 61 / 61°F 94% 1020 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

SW
SW

 3 / 6 mph 64 / 64°F 78% 1018 mb
Low level cloud: 20%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
12:00

NE
NE

 12 / 22 mph 64 / 64°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 93%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

ESE
ESE

 8 / 15 mph 63 / 63°F 72% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Sun 30
Jun		00:00

N
N

 14 / 27 mph 54 / 50°F 91% 1024 mb
Low level cloud: 55%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
67%
0.0 In
06:00

SE
SE

 2 / 4 mph 62 / 62°F 73% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

NNE
NNE

 16 / 31 mph 57 / 54°F 71% 1023 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: medium
51%
0.0 In
18:00

ESE
ESE

 6 / 13 mph 64 / 64°F 71% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: medium
10%
0.0 In
Mon 01
Jul		00:00

N
N

 9 / 17 mph 49 / 46°F 75% 1020 mb
Low level cloud: 75%
Mid level cloud: 13%
High level cloud: 92%
Most Significant Cloud Type: low
90%
0.0 In
06:00

NNE
NNE

 4 / 9 mph 61 / 61°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

N
N

 7 / 14 mph 53 / 51°F 69% 1016 mb
Low level cloud: 75%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 9 / 17 mph 61 / 61°F 85% 1005 mb
Low level cloud: 8%
Mid level cloud: 43%
High level cloud: 9%
Most Significant Cloud Type: medium
67%
0.0 In
Tue 02
Jul		00:00

W
W

 2 / 3 mph 53 / 53°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

E
E

 11 / 22 mph 57 / 55°F 91% 1000 mb
Low level cloud: 34%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
50%
0.0 In
12:00

SE
SE

 7 / 14 mph 60 / 60°F 63% 1014 mb
Low level cloud: 18%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
18:00

SSE
SSE

 12 / 25 mph 65 / 65°F 84% 995 mb
Low level cloud: 54%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.2 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