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Hartcliffe 14 Day Long Range Forecast

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

North Somerset, United Kingdom

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

For Hartcliffe in the coming two weeks the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 14°C expected on the afternoon of Wednesday 5th. The mean minimum temperature will be 4°C, dipping to its lowest on the morning of Friday 28th at 2°C. Expect the coming 14 days to have mixed overhead conditions with some days dry and some seeing a significant amount of rain or sleet. Predictions are Monday 24th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Feb		18:00

SW
SW

 9 / 15 mph 46 / 42°F 88% 1012 mb
Low level cloud: 9%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 11 / 17 mph 44 / 39°F 91% 1012 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 25
Feb		00:00

SW
SW

 7 / 12 mph 43 / 39°F 94% 1012 mb
Low level cloud: 52%
Mid level cloud: 45%
High level cloud: 72%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 6 / 11 mph 44 / 40°F 91% 1012 mb
Low level cloud: 15%
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
06:00

W
W

 6 / 11 mph 43 / 39°F 90% 1012 mb
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 8 / 11 mph 44 / 39°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 11 / 14 mph 48 / 43°F 67% 1015 mb
Low level cloud: 44%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 12 / 17 mph 48 / 43°F 69% 1015 mb
Low level cloud: 7%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 9 / 15 mph 44 / 38°F 82% 1017 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

WSW
WSW

 7 / 12 mph 41 / 36°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 26
Feb		00:00

SW
SW

 6 / 10 mph 41 / 37°F 91% 1019 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 6 / 11 mph 39 / 35°F 92% 1018 mb
Low level cloud: 19%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 13 / 28 mph 38 / 29°F 92% 1015 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 12 / 25 mph 41 / 34°F 94% 1013 mb
Low level cloud: 88%
Mid level cloud: 61%
High level cloud: 19%
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 / 7 mph 44 / 41°F 89% 1012 mb
Low level cloud: 60%
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

WNW
WNW

 11 / 14 mph 46 / 41°F 83% 1010 mb
Low level cloud: 18%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 11 / 13 mph 45 / 39°F 87% 1012 mb
Low level cloud: 2%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 15 / 20 mph 42 / 34°F 84% 1014 mb
Low level cloud: 86%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 27
Feb		00:00

WNW
WNW

 17 / 25 mph 41 / 33°F 81% 1015 mb
Low level cloud: 99%
Mid level cloud: 12%
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

WNW
WNW

 15 / 23 mph 41 / 33°F 74% 1017 mb
Low level cloud: 70%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 9 / 14 mph 39 / 33°F 82% 1019 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 9 / 12 mph 42 / 36°F 78% 1021 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
12:00

NNW
NNW

 10 / 11 mph 47 / 42°F 60% 1023 mb
Low level cloud: 12%
Mid level cloud: 2%
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

NNW
NNW

 8 / 11 mph 49 / 45°F 57% 1023 mb
Low level cloud: 34%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 6 / 12 mph 42 / 38°F 78% 1025 mb
Low level cloud: 43%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 3 / 5 mph 41 / 39°F 84% 1027 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 28
Feb		00:00

SSE
SSE

 1 / 2 mph 38 / 38°F 86% 1028 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 2 / 3 mph 37 / 37°F 86% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
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

SSW
SSW

 1 / 1 mph 35 / 35°F 86% 1029 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
09:00

S
S

 1 / 2 mph 40 / 40°F 75% 1030 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 3 / 3 mph 47 / 47°F 61% 1030 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
15:00

W
W

 4 / 5 mph 48 / 46°F 58% 1029 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 3 / 3 mph 48 / 47°F 76% 1030 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
21:00

SW
SW

 4 / 7 mph 40 / 38°F 78% 1031 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
Sat 01
Mar		00:00

SW
SW

 4 / 9 mph 38 / 34°F 81% 1031 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
03:00

SSW
SSW

 4 / 9 mph 36 / 33°F 86% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 5 / 10 mph 36 / 31°F 88% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 93%
Most Significant Cloud Type: high
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 6 / 9 mph 41 / 36°F 79% 1032 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 98%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 11 / 14 mph 47 / 42°F 76% 1032 mb
Low level cloud: 66%
Mid level cloud: 49%
High level cloud: 99%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 9 / 13 mph 45 / 41°F 84% 1031 mb
Low level cloud: 92%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 9 / 13 mph 45 / 40°F 91% 1031 mb
Low level cloud: 88%
Mid level cloud: 1%
High level cloud: 7%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 6 / 11 mph 44 / 40°F 92% 1031 mb
Low level cloud: 26%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Mar		00:00

WSW
WSW

 7 / 12 mph 41 / 36°F 87% 1031 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 7 / 13 mph 39 / 35°F 90% 1030 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 52%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 7 / 15 mph 39 / 34°F 91% 1030 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 16%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 10 / 14 mph 45 / 39°F 85% 1031 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 34%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 16 / 19 mph 50 / 44°F 74% 1030 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 16 / 20 mph 51 / 45°F 76% 1029 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 15 / 24 mph 45 / 38°F 89% 1029 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 13 / 21 mph 44 / 38°F 93% 1029 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 03
Mar		00:00

SW
SW

 8 / 12 mph 43 / 39°F 89% 1023 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

SW
SW

 10 / 19 mph 39 / 33°F 88% 1023 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
0.0 In
12:00

WNW
WNW

 11 / 17 mph 48 / 43°F 61% 1026 mb
Low level cloud: 37%
Mid level cloud: 5%
High level cloud: 43%
Most Significant Cloud Type: low
44%
0.0 In
18:00

WSW
WSW

 14 / 23 mph 49 / 44°F 83% 1025 mb
Low level cloud: 76%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
Tue 04
Mar		00:00

WSW
WSW

 9 / 15 mph 42 / 37°F 87% 1028 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 20%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

SSW
SSW

 4 / 8 mph 42 / 39°F 97% 1028 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
12:00

WSW
WSW

 6 / 10 mph 51 / 49°F 80% 1025 mb
Low level cloud: 66%
Mid level cloud: 8%
High level cloud: 22%
Most Significant Cloud Type: low
71%
0.0 In
18:00

SW
SW

 7 / 11 mph 55 / 53°F 83% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 05
Mar		00:00

SW
SW

 8 / 13 mph 45 / 41°F 93% 1026 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
06:00

SSW
SSW

 4 / 6 mph 44 / 42°F 83% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SW
SW

 10 / 15 mph 55 / 52°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

S
S

 7 / 10 mph 51 / 49°F 87% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 06
Mar		00:00

SSW
SSW

 5 / 8 mph 46 / 43°F 96% 1021 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

SSE
SSE

 6 / 11 mph 49 / 46°F 90% 1010 mb
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 12 / 19 mph 54 / 51°F 69% 1020 mb
Low level cloud: 13%
Mid level cloud: 3%
High level cloud: 25%
Most Significant Cloud Type: low
17%
0.0 In
18:00

WSW
WSW

 12 / 20 mph 50 / 45°F 91% 1012 mb
Low level cloud: 47%
Mid level cloud: 32%
High level cloud: 11%
Most Significant Cloud Type: low
59%
0.0 In
Fri 07
Mar		00:00

SSW
SSW

 10 / 16 mph 50 / 46°F 87% 1017 mb
Low level cloud: 18%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

SSE
SSE

 2 / 2 mph 44 / 44°F 88% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

S
S

 14 / 22 mph 57 / 54°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: medium
21%
0.0 In
18:00

SSE
SSE

 13 / 22 mph 45 / 39°F 85% 1014 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Sat 08
Mar		00:00

SSE
SSE

 19 / 32 mph 53 / 48°F 76% 996 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 98%
Most Significant Cloud Type: medium
73%
0.0 In
06:00

SSW
SSW

 9 / 15 mph 44 / 39°F 94% 1003 mb
Low level cloud: 31%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.2 In
12:00

SW
SW

 21 / 34 mph 46 / 38°F 77% 997 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.1 In
18:00

WSW
WSW

 6 / 11 mph 51 / 49°F 91% 998 mb
Low level cloud: 13%
Mid level cloud: 54%
High level cloud: 62%
Most Significant Cloud Type: medium
92%
0.1 In
Sun 09
Mar		00:00

SW
SW

 4 / 9 mph 37 / 33°F 100% 992 mb
Low level cloud: 56%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.7 In
06:00

WNW
WNW

 6 / 11 mph 38 / 34°F 91% 1005 mb
Low level cloud: 7%
Mid level cloud: 66%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
0.0 In
12:00

WSW
WSW

 27 / 51 mph 43 / 34°F 87% 994 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WSW
WSW

 8 / 16 mph 44 / 39°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
Mon 10
Mar		00:00

WSW
WSW

 20 / 41 mph 41 / 32°F 83% 997 mb
Low level cloud: 90%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.1 In
06:00

W
W

 19 / 35 mph 47 / 40°F 90% 999 mb
Low level cloud: 81%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.4 In
12:00

W
W

 19 / 39 mph 45 / 37°F 80% 996 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
18:00

W
W

 21 / 42 mph 45 / 37°F 87% 994 mb
Low level cloud: 36%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.1 In
Tue 11
Mar		00:00

W
W

 13 / 28 mph 39 / 31°F 76% 997 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

WNW
WNW

 13 / 28 mph 41 / 34°F 83% 996 mb
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.1 In
12:00

NW
NW

 14 / 30 mph 46 / 39°F 76% 1002 mb
Low level cloud: 50%
Mid level cloud: 22%
High level cloud: 29%
Most Significant Cloud Type: low
60%
0.0 In
18:00

WNW
WNW

 16 / 33 mph 45 / 38°F 74% 1009 mb
Low level cloud: 53%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
55%
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