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Ynyshir 14 Day Long Range Forecast

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

Rhondda, Cynon, Taff, United Kingdom

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

The outlook for Ynyshir in the two weeks ahead shows the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 21°C expected on the afternoon of Saturday 18th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Saturday 25th at 5°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. It looks like Wednesday 22nd will have the most precipitation with an accumulation of around 9.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		18:00

SW
SW

 4 / 4 mph 67 / 65°F 78% 1011 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 65%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 3 / 7 mph 54 / 52°F 89% 1013 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNW
NNW

 4 / 9 mph 51 / 49°F 91% 1013 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 50%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 9 mph 50 / 48°F 92% 1013 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 3 / 5 mph 55 / 55°F 91% 1014 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 4 / 5 mph 66 / 63°F 82% 1014 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 70%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 6 / 10 mph 70 / 67°F 72% 1014 mb
Low level cloud: 37%
Mid level cloud: 15%
High level cloud: 13%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

ENE
ENE

 7 / 10 mph 66 / 65°F 83% 1014 mb
Low level cloud: 77%
Mid level cloud: 28%
High level cloud: 12%
Most Significant Cloud Type: low
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ENE
ENE

 7 / 11 mph 65 / 63°F 89% 1014 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
65%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 6 / 12 mph 56 / 53°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 7%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NE
NE

 7 / 15 mph 53 / 51°F 95% 1015 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 6 / 12 mph 51 / 49°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 6 / 10 mph 52 / 48°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 11 / 12 mph 62 / 61°F 77% 1017 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 13 / 15 mph 67 / 65°F 69% 1016 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 10 / 12 mph 69 / 68°F 62% 1016 mb
Low level cloud: 29%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 8 / 10 mph 67 / 65°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 6 / 12 mph 56 / 53°F 86% 1016 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
Mon 20
May		00:00

NE
NE

 6 / 12 mph 50 / 48°F 94% 1016 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 6 / 11 mph 48 / 46°F 94% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 5 / 9 mph 52 / 48°F 88% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 10 / 11 mph 61 / 60°F 77% 1015 mb
Low level cloud: 7%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 12 / 14 mph 66 / 64°F 72% 1014 mb
Low level cloud: 68%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 9 / 11 mph 66 / 64°F 73% 1013 mb
Low level cloud: 57%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 7 / 9 mph 64 / 62°F 84% 1012 mb
Low level cloud: 29%
Mid level cloud: 32%
High level cloud: 5%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 5 / 11 mph 53 / 50°F 93% 1012 mb
Low level cloud: 3%
Mid level cloud: 45%
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 21
May		00:00

NE
NE

 4 / 9 mph 49 / 48°F 95% 1011 mb
Low level cloud: 24%
Mid level cloud: 25%
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

ENE
ENE

 4 / 8 mph 49 / 47°F 95% 1011 mb
Low level cloud: 24%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 3 / 4 mph 54 / 52°F 91% 1010 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 2 / 2 mph 58 / 57°F 82% 1011 mb
Low level cloud: 12%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 4 / 4 mph 67 / 64°F 72% 1010 mb
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 6 / 9 mph 67 / 64°F 78% 1009 mb
Low level cloud: 46%
Mid level cloud: 44%
High level cloud: 58%
Most Significant Cloud Type: low
68%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WNW
WNW

 6 / 10 mph 65 / 62°F 85% 1009 mb
Low level cloud: 17%
Mid level cloud: 32%
High level cloud: 89%
Most Significant Cloud Type: low
38%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

 6 / 12 mph 54 / 51°F 92% 1011 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 77%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

WNW
WNW

 5 / 11 mph 50 / 49°F 94% 1011 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 5 / 11 mph 49 / 47°F 93% 1011 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 52%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 4 / 6 mph 54 / 53°F 90% 1011 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 39%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 3 / 3 mph 62 / 61°F 81% 1012 mb
Low level cloud: 14%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 6 / 9 mph 62 / 62°F 81% 1012 mb
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

 10 / 16 mph 63 / 63°F 81% 1011 mb
Low level cloud: 71%
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
18:00

NNW
NNW

 6 / 9 mph 61 / 60°F 87% 1012 mb
Low level cloud: 12%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

 4 / 8 mph 55 / 52°F 95% 1013 mb
Low level cloud: 32%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
58%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May		00:00

NW
NW

 5 / 9 mph 51 / 49°F 95% 1014 mb
Low level cloud: 67%
Mid level cloud: 44%
High level cloud: 88%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 7 / 12 mph 47 / 44°F 95% 1014 mb
Low level cloud: 36%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 7 / 8 mph 52 / 48°F 93% 1015 mb
Low level cloud: 36%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 7 / 8 mph 56 / 53°F 86% 1016 mb
Low level cloud: 59%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 10 / 11 mph 58 / 56°F 78% 1016 mb
Low level cloud: 94%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 12 / 14 mph 56 / 53°F 80% 1016 mb
Low level cloud: 88%
Mid level cloud: 5%
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

WNW
WNW

 11 / 12 mph 55 / 51°F 82% 1017 mb
Low level cloud: 56%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 6 / 10 mph 47 / 43°F 90% 1018 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 96%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		00:00

NNW
NNW

 5 / 10 mph 53 / 52°F 94% 1012 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: low
18%
0.0 In
06:00

NNE
NNE

 3 / 7 mph 51 / 50°F 85% 1014 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: medium
58%
0.0 In
12:00

ENE
ENE

 13 / 28 mph 61 / 61°F 88% 1016 mb
Low level cloud: 85%
Mid level cloud: 89%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

 9 / 20 mph 62 / 62°F 85% 1017 mb
Low level cloud: 26%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
Sat 25
May		00:00

NE
NE

 8 / 17 mph 54 / 52°F 95% 1019 mb
Low level cloud: 65%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
06:00

WNW
WNW

 5 / 10 mph 56 / 55°F 85% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

SSW
SSW

 9 / 19 mph 59 / 57°F 67% 1021 mb
Low level cloud: 32%
Mid level cloud: 30%
High level cloud: 34%
Most Significant Cloud Type: low
46%
0.0 In
18:00

S
S

 10 / 21 mph 64 / 64°F 80% 1018 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 68%
Most Significant Cloud Type: medium
26%
0.0 In
Sun 26
May		00:00

ESE
ESE

 6 / 13 mph 57 / 56°F 98% 1013 mb
Low level cloud: 100%
Mid level cloud: 86%
High level cloud: 70%
Most Significant Cloud Type: low
100%
0.0 In
06:00

E
E

 4 / 9 mph 53 / 52°F 90% 1017 mb
Low level cloud: 93%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 10 / 20 mph 58 / 56°F 95% 1011 mb
Low level cloud: 83%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

WSW
WSW

 13 / 26 mph 56 / 53°F 89% 1015 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
38%
0.1 In
Mon 27
May		00:00

ENE
ENE

 14 / 29 mph 57 / 53°F 97% 1013 mb
Low level cloud: 95%
Mid level cloud: 75%
High level cloud: 31%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WNW
WNW

 9 / 20 mph 49 / 45°F 88% 1018 mb
Low level cloud: 52%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
12:00

NE
NE

 14 / 29 mph 63 / 63°F 80% 1015 mb
Low level cloud: 27%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.1 In
18:00

WNW
WNW

 11 / 23 mph 54 / 50°F 72% 1021 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Tue 28
May		00:00

N
N

 5 / 11 mph 55 / 54°F 92% 1015 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 8%
Most Significant Cloud Type: low
6%
0.0 In
06:00

NW
NW

 3 / 7 mph 53 / 53°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

SW
SW

 5 / 11 mph 69 / 69°F 73% 1013 mb
Low level cloud: 16%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
29%
0.0 In
18:00

WNW
WNW

 8 / 17 mph 58 / 57°F 73% 1024 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: low
15%
0.0 In
Wed 29
May		00:00

W
W

 4 / 9 mph 55 / 55°F 96% 1011 mb
Low level cloud: 36%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
54%
0.0 In
06:00

WSW
WSW

 3 / 6 mph 45 / 45°F 82% 1022 mb
Low level cloud: 6%
Mid level cloud: 51%
High level cloud: 98%
Most Significant Cloud Type: medium
72%
0.0 In
12:00

W
W

 14 / 29 mph 59 / 59°F 61% 1011 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 65%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

S
S

 8 / 17 mph 50 / 47°F 97% 1018 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.1 In
Thu 30
May		00:00

W
W

 4 / 9 mph 45 / 43°F 93% 1012 mb
Low level cloud: 4%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
06:00

NNW
NNW

 9 / 19 mph 52 / 49°F 89% 1019 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
49%
0.0 In
12:00

WSW
WSW

 13 / 28 mph 58 / 55°F 66% 1010 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 35%
Most Significant Cloud Type: medium
30%
0.0 In
18:00

NW
NW

 10 / 21 mph 58 / 56°F 73% 1021 mb
Low level cloud: 18%
Mid level cloud: 7%
High level cloud: 49%
Most Significant Cloud Type: low
25%
0.0 In
Fri 31
May		00:00

SW
SW

 4 / 8 mph 50 / 49°F 89% 1008 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.0 In
06:00

W
W

 3 / 7 mph 53 / 52°F 90% 1022 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
0.0 In
12:00

WNW
WNW

 16 / 33 mph 57 / 53°F 68% 1011 mb
Low level cloud: 75%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.1 In
18:00

WSW
WSW

 16 / 34 mph 56 / 52°F 83% 1021 mb
Low level cloud: 2%
Mid level cloud: 9%
High level cloud: 63%
Most Significant Cloud Type: medium
15%
0.0 In
Sat 01
Jun		00:00

NW
NW

 5 / 11 mph 46 / 43°F 91% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

WSW
WSW

 9 / 19 mph 55 / 53°F 91% 1020 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
27%
0.0 In
12:00

W
W

 8 / 17 mph 61 / 61°F 62% 1019 mb
Low level cloud: 49%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
18:00

WSW
WSW

 9 / 19 mph 63 / 63°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 62%
Most Significant Cloud Type: medium
6%
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