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Chelwood 14 Day Long Range Forecast

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

Bath and North East Somerset, United Kingdom

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

For Chelwood in the coming two weeks the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 26°C expected on the afternoon of Wednesday 6th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Saturday 2nd at 10°C. Expect the following 14 days ahead to have mostly dry days although Tuesday 29th and Thursday 31st are likely to see a significant amount of rain. Current predictions suggest Thursday 31st 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
Tue 29
Jul		18:00

NNW
NNW

 9 / 12 mph 69 / 69°F 70% 1017 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 4 / 7 mph 64 / 64°F 88% 1019 mb
Low level cloud: 86%
Mid level cloud: 80%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 30
Jul		00:00

N
N

 4 / 5 mph 62 / 62°F 91% 1019 mb
Low level cloud: 35%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 2 / 4 mph 57 / 59°F 94% 1019 mb
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 2 / 4 mph 59 / 59°F 91% 1020 mb
Low level cloud: 94%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 1 / 2 mph 68 / 65°F 74% 1020 mb
Low level cloud: 25%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 9 / 11 mph 75 / 77°F 48% 1019 mb
Low level cloud: 76%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 14 / 16 mph 77 / 77°F 41% 1018 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 91%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 13 / 15 mph 74 / 76°F 54% 1018 mb
Low level cloud: 72%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 12 mph 66 / 64°F 80% 1019 mb
Low level cloud: 33%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 31
Jul		00:00

WSW
WSW

 5 / 8 mph 60 / 60°F 95% 1019 mb
Low level cloud: 65%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 9 mph 60 / 60°F 96% 1018 mb
Low level cloud: 63%
Mid level cloud: 40%
High level cloud: 94%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 5 / 7 mph 63 / 63°F 96% 1017 mb
Low level cloud: 87%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 7 / 10 mph 66 / 65°F 89% 1017 mb
Low level cloud: 48%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WNW
WNW

 9 / 12 mph 73 / 76°F 69% 1016 mb
Low level cloud: 73%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: low
81%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NNW
NNW

 9 / 15 mph 73 / 76°F 73% 1015 mb
Low level cloud: 42%
Mid level cloud: 27%
High level cloud: 39%
Most Significant Cloud Type: low
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

N
N

 7 / 10 mph 71 / 69°F 71% 1016 mb
Low level cloud: 33%
Mid level cloud: 30%
High level cloud: 13%
Most Significant Cloud Type: low
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

 9 / 15 mph 61 / 61°F 68% 1017 mb
Low level cloud: 17%
Mid level cloud: 31%
High level cloud: 14%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 01
Aug		00:00

NNW
NNW

 8 / 13 mph 57 / 55°F 81% 1018 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 8 / 12 mph 56 / 54°F 77% 1018 mb
Low level cloud: 89%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 8 / 10 mph 58 / 55°F 74% 1019 mb
Low level cloud: 82%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 7 / 8 mph 61 / 60°F 64% 1019 mb
Low level cloud: 72%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 5 / 6 mph 69 / 67°F 49% 1019 mb
Low level cloud: 16%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 7 / 9 mph 75 / 75°F 38% 1018 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 3 / 3 mph 74 / 76°F 45% 1018 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 8 / 13 mph 63 / 63°F 55% 1020 mb
Low level cloud: 3%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 02
Aug		00:00

NNE
NNE

 7 / 12 mph 56 / 54°F 77% 1022 mb
Low level cloud: 6%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 6 mph 53 / 53°F 88% 1022 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 2 / 4 mph 55 / 55°F 82% 1022 mb
Low level cloud: 7%
Mid level cloud: 0%
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

NW
NW

 4 / 5 mph 67 / 65°F 57% 1022 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 7 / 8 mph 71 / 70°F 43% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 98%
Most Significant Cloud Type: high
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 7 / 8 mph 75 / 75°F 38% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 9 / 10 mph 74 / 76°F 46% 1021 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 7 / 12 mph 62 / 62°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 03
Aug		00:00

W
W

 3 / 5 mph 59 / 59°F 80% 1023 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 15%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 4 / 8 mph 57 / 57°F 76% 1023 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 4 / 6 mph 62 / 59°F 64% 1022 mb
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 11 / 12 mph 71 / 69°F 63% 1022 mb
Low level cloud: 35%
Mid level cloud: 33%
High level cloud: 90%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 15 / 17 mph 76 / 77°F 53% 1022 mb
Low level cloud: 12%
Mid level cloud: 20%
High level cloud: 41%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 19 / 21 mph 75 / 77°F 59% 1021 mb
Low level cloud: 39%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 14 / 16 mph 69 / 69°F 78% 1021 mb
Low level cloud: 87%
Mid level cloud: 13%
High level cloud: 19%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 8 / 12 mph 63 / 63°F 94% 1023 mb
Low level cloud: 54%
Mid level cloud: 5%
High level cloud: 73%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 04
Aug		00:00

W
W

 7 / 11 mph 63 / 63°F 88% 1023 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 99%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 4 / 7 mph 60 / 60°F 89% 1023 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 5 / 8 mph 62 / 60°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 46%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 12 / 14 mph 70 / 69°F 44% 1023 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 13 / 15 mph 71 / 69°F 44% 1022 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 9%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 19 / 22 mph 79 / 76°F 26% 1019 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 21 / 24 mph 72 / 76°F 69% 1018 mb
Low level cloud: 25%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 18 / 26 mph 63 / 63°F 81% 1020 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 05
Aug		00:00

W
W

 15 / 29 mph 64 / 64°F 90% 1026 mb
Low level cloud: 93%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
96%
0.0 In
06:00

WSW
WSW

 6 / 13 mph 64 / 64°F 95% 1026 mb
Low level cloud: 27%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
12:00

W
W

 20 / 41 mph 78 / 78°F 46% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

N
N

 15 / 32 mph 76 / 77°F 40% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 06
Aug		00:00

N
N

 5 / 11 mph 58 / 58°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

S
S

 2 / 4 mph 64 / 64°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SSE
SSE

 7 / 14 mph 78 / 78°F 33% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

WSW
WSW

 6 / 11 mph 82 / 81°F 31% 1021 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
0.0 In
Thu 07
Aug		00:00

SSW
SSW

 5 / 10 mph 64 / 64°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

ESE
ESE

 2 / 4 mph 63 / 63°F 67% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

WSW
WSW

 11 / 24 mph 63 / 63°F 78% 1014 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 6 / 12 mph 84 / 82°F 27% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
0.0 In
Fri 08
Aug		00:00

NNW
NNW

 4 / 8 mph 60 / 60°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 96%
Most Significant Cloud Type: high
96%
0.0 In
06:00

ENE
ENE

 4 / 8 mph 64 / 65°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

SSW
SSW

 3 / 7 mph 72 / 76°F 41% 1018 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
18:00

N
N

 11 / 20 mph 63 / 63°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
0.0 In
Sat 09
Aug		00:00

W
W

 6 / 13 mph 60 / 60°F 92% 1022 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
9%
0.0 In
06:00

N
N

 5 / 9 mph 60 / 60°F 85% 1021 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
12:00

W
W

 13 / 27 mph 74 / 76°F 44% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

W
W

 11 / 21 mph 75 / 77°F 44% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 10
Aug		00:00

WSW
WSW

 9 / 20 mph 59 / 59°F 91% 1024 mb
Low level cloud: 10%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
06:00

NNW
NNW

 2 / 4 mph 64 / 64°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

W
W

 13 / 27 mph 78 / 78°F 37% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

WSW
WSW

 8 / 15 mph 81 / 80°F 36% 1021 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Mon 11
Aug		00:00

NNW
NNW

 4 / 7 mph 64 / 64°F 71% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NNE
NNE

 5 / 9 mph 61 / 61°F 78% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

WNW
WNW

 8 / 16 mph 79 / 79°F 35% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

NNW
NNW

 5 / 9 mph 91 / 87°F 21% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Tue 12
Aug		00:00

NE
NE

 3 / 7 mph 68 / 68°F 63% 1027 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NE
NE

 4 / 8 mph 67 / 67°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
0.0 In
12:00

W
W

 5 / 10 mph 88 / 86°F 31% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SSE
SSE

 10 / 18 mph 89 / 85°F 19% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Wed 13
Aug		00:00

N
N

 2 / 5 mph 73 / 76°F 61% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NE
NE

 5 / 9 mph 69 / 69°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

S
S

 7 / 15 mph 90 / 87°F 20% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 79%
Most Significant Cloud Type: medium
46%
0.0 In
18:00

S
S

 10 / 19 mph 95 / 92°F 18% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
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