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Marsh 14 Day Long Range Forecast

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

Buckinghamshire, United Kingdom

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

The next 14 day outlook for Marsh shows the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 22°C expected on the afternoon of Friday 24th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Thursday 30th at 5°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Monday 27th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 23
Sep
15:00

WNW
WNW

12 / 14 mph 71 / 70°F 55% 1018 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

7 / 14 mph 63 / 62°F 66% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NW
NW

4 / 7 mph 58 / 58°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 24
Sep
00:00

SW
SW

3 / 6 mph 55 / 55°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

5 / 10 mph 53 / 51°F 93% 1017 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SW
SW

6 / 12 mph 51 / 49°F 94% 1017 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

8 / 9 mph 62 / 61°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

9 / 11 mph 70 / 69°F 46% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

11 / 13 mph 72 / 76°F 55% 1014 mb
Low level cloud: 6%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

8 / 14 mph 65 / 64°F 77% 1014 mb
Low level cloud: 62%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

6 / 10 mph 62 / 62°F 87% 1015 mb
Low level cloud: 55%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 25
Sep
00:00

WSW
WSW

4 / 7 mph 61 / 61°F 89% 1015 mb
Low level cloud: 78%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: low
81%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

3 / 4 mph 60 / 60°F 90% 1014 mb
Low level cloud: 79%
Mid level cloud: 16%
High level cloud: 12%
Most Significant Cloud Type: low
86%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

2 / 3 mph 60 / 60°F 89% 1014 mb
Low level cloud: 68%
Mid level cloud: 18%
High level cloud: 48%
Most Significant Cloud Type: low
80%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

S
S

2 / 3 mph 63 / 63°F 82% 1015 mb
Low level cloud: 93%
Mid level cloud: 16%
High level cloud: 26%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

S
S

4 / 5 mph 66 / 65°F 76% 1014 mb
Low level cloud: 85%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSE
SSE

5 / 6 mph 67 / 66°F 73% 1013 mb
Low level cloud: 78%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSE
SSE

4 / 6 mph 65 / 64°F 82% 1013 mb
Low level cloud: 71%
Mid level cloud: 19%
High level cloud: 33%
Most Significant Cloud Type: low
81%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSE
SSE

4 / 8 mph 61 / 61°F 89% 1013 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 26
Sep
00:00

S
S

6 / 11 mph 57 / 56°F 94% 1012 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

S
S

4 / 10 mph 54 / 53°F 78% 1011 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

S
S

5 / 11 mph 53 / 51°F 76% 1011 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: medium
76%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SSW
SSW

8 / 10 mph 64 / 62°F 65% 1011 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SSW
SSW

13 / 15 mph 69 / 68°F 61% 1010 mb
Low level cloud: 36%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSW
SSW

16 / 19 mph 70 / 69°F 48% 1009 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 18%
Most Significant Cloud Type: medium
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSW
SSW

14 / 21 mph 60 / 60°F 80% 1009 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

14 / 22 mph 58 / 55°F 86% 1009 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 72%
Most Significant Cloud Type: low
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 27
Sep
00:00

SSW
SSW

17 / 25 mph 59 / 59°F 84% 1008 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

12 / 17 mph 54 / 50°F 89% 1009 mb
Low level cloud: 25%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.15 In of precipitation over the past 3 hours.
0.15 In
06:00

WSW
WSW

11 / 17 mph 50 / 46°F 90% 1012 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
09:00

WSW
WSW

16 / 19 mph 56 / 51°F 73% 1015 mb
Low level cloud: 40%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

18 / 21 mph 60 / 60°F 57% 1017 mb
Low level cloud: 85%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

WSW
WSW

17 / 20 mph 62 / 61°F 47% 1019 mb
Low level cloud: 10%
Mid level cloud: 32%
High level cloud: 41%
Most Significant Cloud Type: medium
62%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

10 / 17 mph 55 / 52°F 61% 1021 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSW
SSW

7 / 13 mph 51 / 48°F 75% 1023 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 28
Sep
00:00

SSW
SSW

7 / 13 mph 51 / 48°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SSW
SSW

9 / 14 mph 52 / 48°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
74%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

S
S

8 / 14 mph 51 / 48°F 85% 1023 mb
Low level cloud: 1%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: medium
68%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

S
S

12 / 15 mph 55 / 51°F 78% 1023 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SSW
SSW

16 / 18 mph 62 / 62°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 45%
Most Significant Cloud Type: medium
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

S
S

15 / 18 mph 63 / 62°F 51% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

S
S

8 / 15 mph 55 / 52°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SSE
SSE

6 / 12 mph 51 / 49°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 29
Sep
00:00

S
S

6 / 12 mph 51 / 48°F 70% 1017 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

S
S

8 / 13 mph 50 / 47°F 87% 1015 mb
Low level cloud: 83%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
06:00

NW
NW

16 / 21 mph 48 / 42°F 91% 1016 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 30%
Most Significant Cloud Type: low
94%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
09:00

NW
NW

17 / 25 mph 48 / 42°F 80% 1018 mb
Low level cloud: 81%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
12:00

NW
NW

20 / 23 mph 55 / 50°F 54% 1019 mb
Low level cloud: 67%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NW
NW

19 / 22 mph 57 / 53°F 47% 1020 mb
Low level cloud: 2%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NW
NW

17 / 27 mph 50 / 44°F 59% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

14 / 21 mph 47 / 42°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 30
Sep
00:00

NW
NW

6 / 8 mph 46 / 43°F 86% 1027 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.00 In
06:00

NW
NW

13 / 21 mph 43 / 37°F 85% 1021 mb
Low level cloud: 54%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: low
63%
0.00 In
12:00

SSW
SSW

16 / 18 mph 58 / 55°F 47% 1028 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 4%
Most Significant Cloud Type: medium
12%
0.00 In
18:00

S
S

4 / 5 mph 61 / 61°F 83% 1021 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.00 In
Fri 01
Oct
00:00

S
S

15 / 25 mph 49 / 44°F 93% 1002 mb
Low level cloud: 46%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.08 In
06:00

S
S

7 / 12 mph 44 / 40°F 96% 1011 mb
Low level cloud: 92%
Mid level cloud: 14%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.01 In
12:00

W
W

13 / 18 mph 60 / 60°F 62% 1013 mb
Low level cloud: 16%
Mid level cloud: 12%
High level cloud: 35%
Most Significant Cloud Type: low
24%
0.01 In
18:00

NW
NW

6 / 7 mph 60 / 60°F 87% 1012 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.02 In
Sat 02
Oct
00:00

WSW
WSW

13 / 21 mph 53 / 49°F 86% 1009 mb
Low level cloud: 9%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.08 In
06:00

WNW
WNW

6 / 9 mph 49 / 46°F 91% 1013 mb
Low level cloud: 31%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.00 In
12:00

W
W

15 / 18 mph 56 / 52°F 67% 1011 mb
Low level cloud: 73%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
86%
0.00 In
18:00

NE
NE

8 / 12 mph 53 / 50°F 81% 1016 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
77%
0.01 In
Sun 03
Oct
00:00

S
S

12 / 22 mph 48 / 43°F 93% 1006 mb
Low level cloud: 65%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.06 In
06:00

NE
NE

1 / 2 mph 44 / 44°F 92% 1018 mb
Low level cloud: 49%
Mid level cloud: 11%
High level cloud: 20%
Most Significant Cloud Type: low
55%
0.00 In
12:00

NW
NW

15 / 19 mph 52 / 47°F 88% 1002 mb
Low level cloud: 95%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.02 In
18:00

SW
SW

6 / 8 mph 51 / 49°F 93% 1013 mb
Low level cloud: 62%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.02 In
Mon 04
Oct
00:00

NW
NW

22 / 34 mph 47 / 40°F 85% 1011 mb
Low level cloud: 96%
Mid level cloud: 23%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.01 In
06:00

S
S

4 / 5 mph 54 / 53°F 99% 1002 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.24 In
12:00

NNW
NNW

20 / 24 mph 53 / 47°F 68% 1020 mb
Low level cloud: 86%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.00 In
18:00

NW
NW

11 / 16 mph 50 / 46°F 92% 1007 mb
Low level cloud: 94%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.01 In
Tue 05
Oct
00:00

NW
NW

4 / 5 mph 48 / 47°F 90% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: medium
4%
0.00 In
06:00

NW
NW

8 / 10 mph 48 / 44°F 95% 1012 mb
Low level cloud: 99%
Mid level cloud: 86%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.08 In
12:00

SW
SW

15 / 21 mph 51 / 46°F 97% 1017 mb
Low level cloud: 99%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.28 In
18:00

NNW
NNW

6 / 7 mph 55 / 54°F 75% 1020 mb
Low level cloud: 63%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.00 In
Wed 06
Oct
00:00

WSW
WSW

19 / 39 mph 55 / 50°F 97% 1008 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.01 In
06:00

WNW
WNW

5 / 7 mph 47 / 45°F 86% 1025 mb
Low level cloud: 52%
Mid level cloud: 99%
High level cloud: 33%
Most Significant Cloud Type: low
90%
0.00 In
12:00

WNW
WNW

15 / 20 mph 58 / 55°F 62% 1013 mb
Low level cloud: 25%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.00 In
18:00

WSW
WSW

7 / 11 mph 54 / 52°F 70% 1024 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 52%
Most Significant Cloud Type: medium
48%
0.00 In
Thu 07
Oct
00:00

SW
SW

15 / 31 mph 55 / 51°F 93% 1009 mb
Low level cloud: 99%
Mid level cloud: 31%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.00 In
06:00

WSW
WSW

12 / 19 mph 53 / 49°F 96% 1020 mb
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 11%
Most Significant Cloud Type: low
99%
0.00 In
12:00

WSW
WSW

24 / 31 mph 59 / 55°F 64% 1003 mb
Low level cloud: 13%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.00 In
18:00

WSW
WSW

16 / 24 mph 57 / 54°F 94% 1017 mb
Low level cloud: 99%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.03 In
Fri 08
Oct
00:00

WSW
WSW

30 / 62 mph 49 / 41°F 72% 995 mb
Low level cloud: 99%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.01 In
06:00

SSW
SSW

15 / 21 mph 55 / 51°F 96% 1011 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.11 In
12:00

WNW
WNW

23 / 33 mph 53 / 47°F 72% 1005 mb
Low level cloud: 81%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.01 In
18:00

NNW
NNW

11 / 15 mph 48 / 43°F 93% 1005 mb
Low level cloud: 95%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.33 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