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Sheffield Bottom 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Sheffield Bottom

Berkshire, United Kingdom

Long range weather outlook for Sheffield Bottom includes 14 day forecast summary:

The next 14 day outlook for Sheffield Bottom 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 Sunday 19th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 21st at 5°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Friday 24th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 18
May
15:00

NE
NE

9 / 11 mph 67 / 65°F 78% 1012 mb
Low level cloud: 48%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

5 / 8 mph 66 / 63°F 86% 1012 mb
Low level cloud: 51%
Mid level cloud: 20%
High level cloud: 15%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 14 mph 56 / 53°F 93% 1014 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 10%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

6 / 12 mph 50 / 47°F 96% 1014 mb
Low level cloud: 13%
Mid level cloud: 17%
High level cloud: 9%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 13 mph 46 / 43°F 98% 1014 mb
Low level cloud: 48%
Mid level cloud: 23%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

7 / 11 mph 50 / 46°F 97% 1014 mb
Low level cloud: 70%
Mid level cloud: 14%
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

NE
NE

9 / 10 mph 63 / 60°F 82% 1015 mb
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

9 / 11 mph 69 / 68°F 65% 1014 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

12 / 16 mph 69 / 68°F 69% 1013 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

12 / 17 mph 64 / 63°F 83% 1014 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 12 mph 56 / 54°F 93% 1015 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

7 / 12 mph 51 / 49°F 95% 1015 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 12 mph 48 / 44°F 90% 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

NNE
NNE

9 / 13 mph 49 / 44°F 92% 1015 mb
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

13 / 15 mph 56 / 52°F 85% 1014 mb
Low level cloud: 66%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

13 / 15 mph 63 / 63°F 71% 1013 mb
Low level cloud: 94%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

14 / 17 mph 64 / 63°F 75% 1012 mb
Low level cloud: 83%
Mid level cloud: 11%
High level cloud: 12%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

13 / 18 mph 62 / 60°F 82% 1011 mb
Low level cloud: 49%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

9 / 15 mph 51 / 47°F 88% 1012 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
Tue 21
May
00:00

NNE
NNE

7 / 12 mph 47 / 43°F 89% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 12 mph 43 / 39°F 94% 1010 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

7 / 11 mph 47 / 43°F 88% 1010 mb
Low level cloud: 10%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

9 / 10 mph 57 / 54°F 77% 1009 mb
Low level cloud: 19%
Mid level cloud: 9%
High level cloud: 58%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

8 / 9 mph 63 / 63°F 71% 1009 mb
Low level cloud: 78%
Mid level cloud: 47%
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

NNE
NNE

7 / 9 mph 64 / 63°F 79% 1008 mb
Low level cloud: 48%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

7 / 10 mph 61 / 60°F 87% 1008 mb
Low level cloud: 57%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

5 / 9 mph 56 / 55°F 90% 1009 mb
Low level cloud: 15%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNW
NNW

6 / 10 mph 55 / 53°F 93% 1009 mb
Low level cloud: 37%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

7 / 11 mph 53 / 51°F 97% 1008 mb
Low level cloud: 57%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

10 / 15 mph 54 / 50°F 97% 1007 mb
Low level cloud: 62%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

WNW
WNW

12 / 17 mph 55 / 51°F 94% 1007 mb
Low level cloud: 80%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WNW
WNW

13 / 19 mph 53 / 49°F 92% 1008 mb
Low level cloud: 44%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

12 / 19 mph 55 / 50°F 90% 1007 mb
Low level cloud: 18%
Mid level cloud: 51%
High level cloud: 77%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

9 / 13 mph 57 / 54°F 90% 1007 mb
Low level cloud: 17%
Mid level cloud: 47%
High level cloud: 5%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

7 / 12 mph 55 / 52°F 93% 1008 mb
Low level cloud: 10%
Mid level cloud: 53%
High level cloud: 9%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

8 / 12 mph 53 / 50°F 94% 1008 mb
Low level cloud: 29%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

9 / 15 mph 51 / 47°F 97% 1008 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

9 / 12 mph 54 / 50°F 95% 1010 mb
Low level cloud: 54%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

12 / 15 mph 60 / 60°F 82% 1010 mb
Low level cloud: 73%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

14 / 19 mph 64 / 63°F 76% 1012 mb
Low level cloud: 60%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

13 / 15 mph 66 / 65°F 69% 1012 mb
Low level cloud: 48%
Mid level cloud: 19%
High level cloud: 3%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

9 / 11 mph 64 / 62°F 80% 1013 mb
Low level cloud: 15%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

5 / 10 mph 55 / 52°F 95% 1015 mb
Low level cloud: 15%
Mid level cloud: 19%
High level cloud: 3%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SSE
SSE

2 / 5 mph 51 / 51°F 95% 1015 mb
Low level cloud: 24%
Mid level cloud: 6%
High level cloud: 22%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

2 / 3 mph 49 / 49°F 95% 1015 mb
Low level cloud: 23%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 5 mph 54 / 53°F 92% 1015 mb
Low level cloud: 19%
Mid level cloud: 13%
High level cloud: 35%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

4 / 5 mph 64 / 61°F 78% 1015 mb
Low level cloud: 58%
Mid level cloud: 26%
High level cloud: 8%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

4 / 6 mph 64 / 64°F 76% 1015 mb
Low level cloud: 63%
Mid level cloud: 79%
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

WSW
WSW

6 / 9 mph 57 / 56°F 96% 1016 mb
Low level cloud: 30%
Mid level cloud: 99%
High level cloud: 80%
Most Significant Cloud Type: medium
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
18:00

WNW
WNW

6 / 10 mph 58 / 54°F 95% 1016 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 15%
Most Significant Cloud Type: medium
54%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
21:00

WNW
WNW

4 / 7 mph 55 / 52°F 94% 1017 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
00:00

NNE
NNE

15 / 31 mph 54 / 50°F 97% 1017 mb
Low level cloud: 76%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
06:00

NW
NW

4 / 8 mph 60 / 60°F 92% 1024 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
12:00

SW
SW

8 / 17 mph 60 / 60°F 59% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

S
S

9 / 18 mph 66 / 66°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Sun 26
May
00:00

E
E

4 / 9 mph 61 / 61°F 95% 1014 mb
Low level cloud: 26%
Mid level cloud: 53%
High level cloud: 87%
Most Significant Cloud Type: low
55%
0.0 In
06:00

ESE
ESE

5 / 10 mph 56 / 55°F 89% 1020 mb
Low level cloud: 31%
Mid level cloud: 94%
High level cloud: 86%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SSW
SSW

11 / 24 mph 62 / 62°F 66% 1007 mb
Low level cloud: 62%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.0 In
18:00

SE
SE

10 / 20 mph 65 / 65°F 90% 1012 mb
Low level cloud: 21%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 27
May
00:00

WSW
WSW

7 / 15 mph 50 / 47°F 96% 1008 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.3 In
06:00

SW
SW

5 / 10 mph 56 / 56°F 94% 1011 mb
Low level cloud: 65%
Mid level cloud: 27%
High level cloud: 27%
Most Significant Cloud Type: low
77%
0.2 In
12:00

W
W

9 / 18 mph 54 / 52°F 94% 1009 mb
Low level cloud: 78%
Mid level cloud: 89%
High level cloud: 81%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SE
SE

6 / 14 mph 62 / 62°F 85% 1009 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 57%
Most Significant Cloud Type: low
47%
0.1 In
Tue 28
May
00:00

WSW
WSW

12 / 26 mph 51 / 46°F 96% 1010 mb
Low level cloud: 58%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
94%
0.3 In
06:00

SSW
SSW

9 / 18 mph 53 / 51°F 97% 1009 mb
Low level cloud: 77%
Mid level cloud: 54%
High level cloud: 4%
Most Significant Cloud Type: low
96%
0.2 In
12:00

NW
NW

12 / 25 mph 61 / 62°F 73% 1012 mb
Low level cloud: 64%
Mid level cloud: 18%
High level cloud: 68%
Most Significant Cloud Type: low
78%
0.2 In
18:00

SW
SW

11 / 23 mph 57 / 54°F 85% 1011 mb
Low level cloud: 22%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
38%
0.2 In
Wed 29
May
00:00

W
W

6 / 13 mph 52 / 50°F 96% 1014 mb
Low level cloud: 25%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: low
31%
0.0 In
06:00

WSW
WSW

10 / 21 mph 54 / 51°F 94% 1012 mb
Low level cloud: 79%
Mid level cloud: 41%
High level cloud: 10%
Most Significant Cloud Type: low
94%
0.0 In
12:00

SSW
SSW

11 / 24 mph 55 / 53°F 96% 1012 mb
Low level cloud: 97%
Mid level cloud: 94%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

13 / 26 mph 60 / 60°F 88% 1013 mb
Low level cloud: 42%
Mid level cloud: 54%
High level cloud: 8%
Most Significant Cloud Type: low
61%
0.0 In
Thu 30
May
00:00

WSW
WSW

9 / 19 mph 53 / 50°F 93% 1008 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.3 In
06:00

SSW
SSW

5 / 11 mph 57 / 56°F 94% 1012 mb
Low level cloud: 55%
Mid level cloud: 29%
High level cloud: 82%
Most Significant Cloud Type: low
75%
0.0 In
12:00

SW
SW

17 / 34 mph 61 / 61°F 74% 1009 mb
Low level cloud: 97%
Mid level cloud: 71%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

9 / 19 mph 62 / 62°F 87% 1007 mb
Low level cloud: 50%
Mid level cloud: 59%
High level cloud: 96%
Most Significant Cloud Type: low
81%
0.1 In
Fri 31
May
00:00

WSW
WSW

10 / 20 mph 49 / 44°F 97% 1012 mb
Low level cloud: 56%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
64%
0.1 In
06:00

SSW
SSW

9 / 19 mph 56 / 54°F 95% 1005 mb
Low level cloud: 42%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
49%
0.0 In
12:00

SW
SW

12 / 25 mph 60 / 60°F 72% 1014 mb
Low level cloud: 55%
Mid level cloud: 49%
High level cloud: 36%
Most Significant Cloud Type: low
76%
0.0 In
18:00

SSW
SSW

11 / 23 mph 59 / 57°F 79% 1005 mb
Low level cloud: 7%
Mid level cloud: 9%
High level cloud: 65%
Most Significant Cloud Type: medium
30%
0.1 In
Sat 01
Jun
00:00

SSE
SSE

5 / 11 mph 56 / 55°F 87% 1013 mb
Low level cloud: 34%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
72%
0.0 In
06:00

S
S

6 / 13 mph 55 / 54°F 92% 1005 mb
Low level cloud: 39%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: low
42%
0.0 In
12:00

SSE
SSE

14 / 29 mph 67 / 67°F 71% 1009 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
0.0 In
18:00

SSW
SSW

11 / 23 mph 60 / 60°F 78% 1007 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
Sun 02
Jun
00:00

SSW
SSW

18 / 38 mph 58 / 54°F 88% 1006 mb
Low level cloud: 88%
Mid level cloud: 20%
High level cloud: 77%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

8 / 16 mph 55 / 53°F 92% 1009 mb
Low level cloud: 29%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
47%
0.0 In
12:00

SW
SW

15 / 32 mph 64 / 64°F 65% 1015 mb
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
40%
0.0 In
18:00

SW
SW

11 / 23 mph 60 / 60°F 88% 1011 mb
Low level cloud: 16%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: low
20%
0.2 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