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Owmby-by-Spital 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Owmby-by-Spital

Lincolnshire, United Kingdom

Long range weather outlook for Owmby-by-Spital includes 14 day forecast summary:

Over the next 14 days the Owmby-by-Spital forecast suggests the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 32°C expected on the afternoon of Saturday 21st. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Tuesday 24th at 9°C. Expect the coming 14 days to have mixed weather with some days dry and some seeing a little rain. It looks like Thursday 26th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the afternoon of Friday 27th, coming from a south westerly direction, and reaching around 26mph.

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

NW
NW

9 / 13 mph 75 / 76°F 47% 1024 mb
Low level cloud: 13%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

6 / 9 mph 64 / 61°F 81% 1025 mb
Low level cloud: 46%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 19
Jun
00:00

ESE
ESE

1 / 2 mph 60 / 60°F 89% 1026 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

1 / 2 mph 57 / 57°F 89% 1026 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
06:00

NE
NE

3 / 4 mph 59 / 58°F 77% 1026 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 71 / 68°F 52% 1027 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

4 / 5 mph 78 / 77°F 43% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

6 / 7 mph 81 / 78°F 41% 1025 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

15 / 22 mph 71 / 69°F 58% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

10 / 17 mph 64 / 63°F 81% 1025 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
Fri 20
Jun
00:00

SE
SE

9 / 14 mph 61 / 61°F 85% 1026 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

SSE
SSE

8 / 13 mph 59 / 58°F 92% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

9 / 14 mph 63 / 61°F 71% 1025 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

10 / 13 mph 73 / 76°F 52% 1024 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

10 / 12 mph 81 / 79°F 42% 1024 mb
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 33%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

14 / 18 mph 83 / 80°F 38% 1022 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 95%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

11 / 16 mph 79 / 78°F 48% 1022 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 99%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

9 / 16 mph 72 / 69°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 6%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Jun
00:00

SSE
SSE

8 / 14 mph 63 / 63°F 78% 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
03:00

SSE
SSE

7 / 13 mph 61 / 61°F 82% 1021 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
06:00

SSE
SSE

9 / 15 mph 65 / 63°F 61% 1021 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
09:00

SSE
SSE

13 / 17 mph 78 / 77°F 38% 1019 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
12:00

SSE
SSE

15 / 17 mph 86 / 82°F 29% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 10%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

15 / 19 mph 89 / 87°F 33% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

5 / 8 mph 74 / 76°F 94% 1014 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 9%
Most Significant Cloud Type: medium
25%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ESE
ESE

5 / 9 mph 73 / 69°F 94% 1015 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 7%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Jun
00:00

S
S

7 / 12 mph 68 / 68°F 93% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 36%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

8 / 14 mph 64 / 64°F 97% 1012 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSW
SSW

8 / 13 mph 66 / 64°F 93% 1011 mb
Low level cloud: 30%
Mid level cloud: 16%
High level cloud: 38%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

13 / 16 mph 74 / 76°F 59% 1011 mb
Low level cloud: 57%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 17 mph 79 / 78°F 41% 1010 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

19 / 26 mph 77 / 77°F 40% 1010 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 73%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

16 / 25 mph 72 / 76°F 49% 1010 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

17 / 26 mph 66 / 65°F 58% 1010 mb
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 23
Jun
00:00

SW
SW

18 / 28 mph 61 / 61°F 68% 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
03:00

W
W

16 / 26 mph 59 / 56°F 86% 1009 mb
Low level cloud: 84%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

16 / 24 mph 55 / 50°F 70% 1010 mb
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

20 / 28 mph 59 / 55°F 47% 1011 mb
Low level cloud: 81%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

21 / 28 mph 64 / 64°F 42% 1011 mb
Low level cloud: 13%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

22 / 30 mph 65 / 64°F 46% 1012 mb
Low level cloud: 51%
Mid level cloud: 60%
High level cloud: 15%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

19 / 27 mph 65 / 64°F 51% 1013 mb
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

14 / 23 mph 59 / 55°F 67% 1014 mb
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 24
Jun
00:00

W
W

10 / 16 mph 55 / 53°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

9 / 14 mph 53 / 50°F 85% 1015 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 21%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

12 / 17 mph 56 / 51°F 72% 1015 mb
Low level cloud: 28%
Mid level cloud: 28%
High level cloud: 66%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

12 / 15 mph 64 / 63°F 52% 1015 mb
Low level cloud: 23%
Mid level cloud: 23%
High level cloud: 26%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

11 / 17 mph 63 / 62°F 51% 1016 mb
Low level cloud: 1%
Mid level cloud: 79%
High level cloud: 12%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

9 / 13 mph 61 / 61°F 57% 1016 mb
Low level cloud: 83%
Mid level cloud: 65%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

2 / 3 mph 61 / 60°F 68% 1016 mb
Low level cloud: 48%
Mid level cloud: 49%
High level cloud: 76%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

4 / 7 mph 58 / 58°F 73% 1017 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 25
Jun
00:00

ENE
ENE

8 / 13 mph 55 / 53°F 97% 1024 mb
Low level cloud: 77%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.0 In
06:00

W
W

6 / 9 mph 55 / 53°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: high
88%
0.0 In
12:00

WNW
WNW

14 / 17 mph 74 / 74°F 22% 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

WNW
WNW

13 / 16 mph 69 / 69°F 39% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 26
Jun
00:00

WSW
WSW

5 / 7 mph 68 / 68°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

SW
SW

5 / 6 mph 65 / 65°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: medium
10%
0.0 In
12:00

WSW
WSW

24 / 33 mph 77 / 77°F 36% 1007 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 97%
Most Significant Cloud Type: medium
31%
0.0 In
18:00

WSW
WSW

14 / 26 mph 77 / 78°F 44% 1016 mb
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
Fri 27
Jun
00:00

SW
SW

15 / 28 mph 63 / 63°F 80% 1013 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: low
89%
0.0 In
06:00

SW
SW

14 / 25 mph 62 / 62°F 79% 1018 mb
Low level cloud: 7%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
12:00

SW
SW

26 / 46 mph 78 / 79°F 45% 1011 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
18:00

SW
SW

15 / 26 mph 83 / 82°F 38% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 28
Jun
00:00

WSW
WSW

12 / 22 mph 61 / 60°F 74% 1016 mb
Low level cloud: 24%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
26%
0.0 In
06:00

SSE
SSE

7 / 12 mph 70 / 70°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

WSW
WSW

7 / 13 mph 73 / 75°F 36% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 41%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

NW
NW

18 / 33 mph 68 / 68°F 48% 1008 mb
Low level cloud: 14%
Mid level cloud: 21%
High level cloud: 58%
Most Significant Cloud Type: low
28%
0.0 In
Sun 29
Jun
00:00

W
W

6 / 11 mph 63 / 63°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
06:00

W
W

14 / 26 mph 58 / 54°F 69% 1014 mb
Low level cloud: 17%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: low
24%
0.0 In
12:00

WNW
WNW

15 / 28 mph 68 / 68°F 34% 1016 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.0 In
18:00

WNW
WNW

17 / 32 mph 65 / 65°F 34% 1018 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: medium
28%
0.0 In
Mon 30
Jun
00:00

WNW
WNW

5 / 9 mph 60 / 60°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 92%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

W
W

8 / 15 mph 56 / 54°F 69% 1024 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

W
W

13 / 24 mph 67 / 67°F 35% 1020 mb
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 13%
Most Significant Cloud Type: medium
71%
0.0 In
18:00

WNW
WNW

14 / 26 mph 68 / 67°F 35% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 01
Jul
00:00

WNW
WNW

5 / 9 mph 59 / 59°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

SSW
SSW

4 / 8 mph 61 / 61°F 72% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
12:00

SW
SW

7 / 13 mph 75 / 75°F 27% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 6%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

ESE
ESE

16 / 29 mph 74 / 75°F 32% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
Wed 02
Jul
00:00

NW
NW

6 / 11 mph 62 / 62°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 38%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

SE
SE

6 / 11 mph 64 / 64°F 51% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 79%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

WSW
WSW

12 / 23 mph 75 / 74°F 25% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

ESE
ESE

13 / 24 mph 78 / 76°F 26% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
0.0 In
Thu 03
Jul
00:00

SW
SW

8 / 15 mph 58 / 56°F 76% 1012 mb
Low level cloud: 39%
Mid level cloud: 38%
High level cloud: 18%
Most Significant Cloud Type: low
54%
0.0 In
06:00

WSW
WSW

14 / 26 mph 63 / 63°F 55% 1001 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
12:00

W
W

18 / 33 mph 65 / 65°F 37% 1013 mb
Low level cloud: 1%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
0.0 In
18:00

W
W

16 / 30 mph 68 / 68°F 36% 1007 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
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