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Glanrhyd 14 Day Long Range Forecast

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

Pembrokeshire, United Kingdom

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

For Glanrhyd in the coming two weeks the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 18°C expected on the afternoon of Tuesday 28th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Saturday 25th at 6°C. Expect the coming 14 days to have most days seeing a little rain. The current forecast indicates Sunday 26th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate. Expect the strongest wind on the morning of Friday 31st, coming from a north westerly direction, and reaching around 26mph.

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

NNW
NNW

 9 / 12 mph 52 / 49°F 78% 1017 mb
Low level cloud: 92%
Mid level cloud: 64%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 10 / 13 mph 51 / 47°F 79% 1017 mb
Low level cloud: 95%
Mid level cloud: 84%
High level cloud: 66%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

NNW
NNW

 7 / 12 mph 49 / 46°F 80% 1017 mb
Low level cloud: 94%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 6 / 9 mph 48 / 45°F 84% 1017 mb
Low level cloud: 81%
Mid level cloud: 80%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 7 / 13 mph 48 / 44°F 86% 1017 mb
Low level cloud: 49%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 7 / 10 mph 49 / 46°F 82% 1018 mb
Low level cloud: 85%
Mid level cloud: 63%
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

WSW
WSW

 6 / 9 mph 51 / 49°F 80% 1019 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 66%
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 / 10 mph 52 / 49°F 81% 1019 mb
Low level cloud: 85%
Mid level cloud: 45%
High level cloud: 52%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 3 / 4 mph 52 / 51°F 79% 1019 mb
Low level cloud: 57%
Mid level cloud: 52%
High level cloud: 9%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 2 / 3 mph 52 / 51°F 81% 1019 mb
Low level cloud: 44%
Mid level cloud: 43%
High level cloud: 3%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May		00:00

SE
SE

 5 / 10 mph 46 / 43°F 86% 1019 mb
Low level cloud: 15%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 6 / 14 mph 44 / 40°F 87% 1018 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
06:00

SE
SE

 7 / 13 mph 46 / 41°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 11 / 12 mph 58 / 55°F 76% 1017 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 13 / 15 mph 63 / 62°F 67% 1016 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 14 / 16 mph 63 / 63°F 75% 1014 mb
Low level cloud: 18%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 12 / 14 mph 59 / 56°F 84% 1013 mb
Low level cloud: 48%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 14 / 24 mph 49 / 44°F 91% 1012 mb
Low level cloud: 75%
Mid level cloud: 100%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 26
May		00:00

SSE
SSE

 15 / 23 mph 51 / 46°F 94% 1009 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSE
SSE

 16 / 33 mph 49 / 43°F 94% 1008 mb
Low level cloud: 87%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 13 / 27 mph 48 / 43°F 93% 1008 mb
Low level cloud: 28%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 13 / 28 mph 52 / 46°F 88% 1009 mb
Low level cloud: 55%
Mid level cloud: 81%
High level cloud: 36%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 17 / 26 mph 55 / 50°F 87% 1010 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 21%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

 18 / 25 mph 57 / 52°F 83% 1010 mb
Low level cloud: 38%
Mid level cloud: 26%
High level cloud: 56%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 17 / 22 mph 55 / 50°F 87% 1012 mb
Low level cloud: 17%
Mid level cloud: 15%
High level cloud: 21%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 11 / 16 mph 53 / 48°F 87% 1013 mb
Low level cloud: 12%
Mid level cloud: 10%
High level cloud: 11%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		00:00

S
S

 10 / 18 mph 48 / 44°F 88% 1013 mb
Low level cloud: 8%
Mid level cloud: 30%
High level cloud: 8%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 9 / 16 mph 47 / 43°F 89% 1013 mb
Low level cloud: 6%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 9 / 14 mph 49 / 45°F 88% 1014 mb
Low level cloud: 9%
Mid level cloud: 58%
High level cloud: 32%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 9 / 13 mph 54 / 50°F 78% 1014 mb
Low level cloud: 13%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 7 / 10 mph 57 / 53°F 75% 1014 mb
Low level cloud: 49%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 6 / 9 mph 57 / 54°F 77% 1014 mb
Low level cloud: 46%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 4 / 6 mph 57 / 55°F 80% 1015 mb
Low level cloud: 26%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 5 / 9 mph 53 / 50°F 88% 1016 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		00:00

SSE
SSE

 9 / 18 mph 47 / 43°F 90% 1015 mb
Low level cloud: 11%
Mid level cloud: 31%
High level cloud: 28%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 10 / 21 mph 48 / 43°F 94% 1014 mb
Low level cloud: 54%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 10 / 19 mph 50 / 46°F 96% 1012 mb
Low level cloud: 99%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

S
S

 17 / 30 mph 51 / 46°F 96% 1010 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSW
SSW

 12 / 14 mph 61 / 61°F 97% 1009 mb
Low level cloud: 99%
Mid level cloud: 60%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 15 / 18 mph 65 / 64°F 90% 1009 mb
Low level cloud: 51%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 16 / 18 mph 64 / 62°F 86% 1008 mb
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 14 / 26 mph 52 / 47°F 92% 1008 mb
Low level cloud: 91%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		00:00

WSW
WSW

 13 / 20 mph 54 / 50°F 93% 1008 mb
Low level cloud: 94%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 8 / 13 mph 52 / 50°F 93% 1008 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 9 / 15 mph 51 / 48°F 93% 1009 mb
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 10 / 12 mph 55 / 51°F 89% 1010 mb
Low level cloud: 54%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 12 / 13 mph 58 / 54°F 84% 1011 mb
Low level cloud: 41%
Mid level cloud: 20%
High level cloud: 6%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 12 / 14 mph 59 / 56°F 83% 1011 mb
Low level cloud: 47%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 13 / 17 mph 58 / 54°F 87% 1011 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 11 / 19 mph 55 / 52°F 90% 1011 mb
Low level cloud: 7%
Mid level cloud: 74%
High level cloud: 2%
Most Significant Cloud Type: medium
94%
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

SSW
SSW

 23 / 48 mph 50 / 43°F 95% 1010 mb
Low level cloud: 100%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

 5 / 11 mph 49 / 47°F 91% 1010 mb
Low level cloud: 19%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
12:00

NNW
NNW

 9 / 15 mph 54 / 51°F 79% 1014 mb
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
18:00

SE
SE

 12 / 23 mph 58 / 55°F 87% 1005 mb
Low level cloud: 30%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
63%
0.0 In
Fri 31
May		00:00

SSE
SSE

 23 / 47 mph 52 / 45°F 94% 1004 mb
Low level cloud: 64%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
06:00

SSW
SSW

 5 / 11 mph 48 / 46°F 90% 1003 mb
Low level cloud: 73%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
91%
0.0 In
12:00

W
W

 6 / 14 mph 57 / 55°F 87% 1011 mb
Low level cloud: 65%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
18:00

NNW
NNW

 18 / 37 mph 56 / 52°F 90% 1019 mb
Low level cloud: 11%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
16%
0.0 In
Sat 01
Jun		00:00

NW
NW

 18 / 38 mph 49 / 42°F 75% 1014 mb
Low level cloud: 21%
Mid level cloud: 23%
High level cloud: 13%
Most Significant Cloud Type: low
30%
0.0 In
06:00

N
N

 15 / 32 mph 50 / 45°F 89% 1023 mb
Low level cloud: 84%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
12:00

W
W

 14 / 29 mph 53 / 48°F 72% 1014 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
18:00

N
N

 13 / 26 mph 53 / 49°F 79% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 02
Jun		00:00

N
N

 19 / 39 mph 48 / 41°F 87% 1013 mb
Low level cloud: 58%
Mid level cloud: 47%
High level cloud: 31%
Most Significant Cloud Type: low
78%
0.1 In
06:00

NNE
NNE

 9 / 19 mph 48 / 44°F 86% 1024 mb
Low level cloud: 32%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
12:00

NW
NW

 16 / 33 mph 51 / 46°F 75% 1017 mb
Low level cloud: 77%
Mid level cloud: 14%
High level cloud: 11%
Most Significant Cloud Type: low
83%
0.0 In
18:00

NNW
NNW

 7 / 14 mph 53 / 51°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
0.0 In
Mon 03
Jun		00:00

SW
SW

 9 / 19 mph 51 / 47°F 87% 1015 mb
Low level cloud: 47%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
92%
0.0 In
06:00

W
W

 7 / 16 mph 49 / 46°F 95% 1024 mb
Low level cloud: 86%
Mid level cloud: 84%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 14 / 30 mph 54 / 50°F 82% 1010 mb
Low level cloud: 28%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.1 In
18:00

NNW
NNW

 6 / 14 mph 55 / 53°F 87% 1023 mb
Low level cloud: 56%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: low
60%
0.0 In
Tue 04
Jun		00:00

W
W

 17 / 35 mph 49 / 43°F 86% 1008 mb
Low level cloud: 3%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
0.1 In
06:00

S
S

 2 / 4 mph 54 / 55°F 87% 1022 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 13%
Most Significant Cloud Type: medium
11%
0.0 In
12:00

WNW
WNW

 14 / 30 mph 50 / 45°F 76% 1012 mb
Low level cloud: 79%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
18:00

SW
SW

 10 / 21 mph 62 / 62°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Wed 05
Jun		00:00

NW
NW

 4 / 8 mph 49 / 47°F 87% 1014 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: medium
68%
0.0 In
06:00

NNW
NNW

 4 / 8 mph 50 / 49°F 89% 1017 mb
Low level cloud: 16%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: low
18%
0.0 In
12:00

W
W

 8 / 17 mph 53 / 50°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

N
N

 12 / 25 mph 56 / 53°F 72% 1015 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 22%
Most Significant Cloud Type: medium
40%
0.0 In
Thu 06
Jun		00:00

SSW
SSW

 8 / 17 mph 49 / 46°F 87% 1018 mb
Low level cloud: 14%
Mid level cloud: 43%
High level cloud: 15%
Most Significant Cloud Type: medium
82%
0.0 In
06:00

N
N

 14 / 29 mph 49 / 43°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
12:00

N
N

 13 / 28 mph 52 / 47°F 72% 1019 mb
Low level cloud: 46%
Mid level cloud: 71%
High level cloud: 99%
Most Significant Cloud Type: low
83%
0.0 In
18:00

WNW
WNW

 10 / 21 mph 53 / 50°F 66% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
Fri 07
Jun		00:00

WSW
WSW

 7 / 16 mph 50 / 47°F 82% 1018 mb
Low level cloud: 2%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
06:00

WNW
WNW

 15 / 32 mph 46 / 39°F 80% 1014 mb
Low level cloud: 10%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.1 In
12:00

WNW
WNW

 11 / 24 mph 53 / 49°F 68% 1019 mb
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
18:00

WSW
WSW

 8 / 17 mph 53 / 50°F 87% 1013 mb
Low level cloud: 92%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
100%
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