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Adventure Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Adventure Island

Essex, United Kingdom

Long range weather outlook for Adventure Island includes 14 day forecast summary:

For Adventure Island in the coming two weeks the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 10°C expected on the afternoon of Monday 19th. The mean minimum temperature will be 4°C, dipping to its lowest on the morning of Sunday 11th at 3°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The current forecast indicates Tuesday 13th will have the most precipitation with an accumulation of around 9.0mm. On the whole winds are likely to be moderate. The strongest wind will be felt on the morning of Monday 19th, coming from a southerly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 11
Jan		18:00

S
S

 28 / 32 mph 47 / 38°F 90% 1008 mb
Low level cloud: 100%
Mid level cloud: 90%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 28 / 39 mph 45 / 36°F 91% 1005 mb
Low level cloud: 100%
Mid level cloud: 91%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
Jan		00:00

SSW
SSW

 25 / 47 mph 45 / 36°F 93% 1003 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 18 / 38 mph 44 / 36°F 89% 1003 mb
Low level cloud: 63%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 17 / 36 mph 43 / 35°F 84% 1004 mb
Low level cloud: 87%
Mid level cloud: 5%
High level cloud: 94%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 16 / 34 mph 45 / 38°F 85% 1004 mb
Low level cloud: 88%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 17 / 32 mph 48 / 41°F 86% 1004 mb
Low level cloud: 52%
Mid level cloud: 100%
High level cloud: 94%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 12 / 17 mph 49 / 44°F 91% 1003 mb
Low level cloud: 31%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 15 / 24 mph 48 / 42°F 89% 1004 mb
Low level cloud: 91%
Mid level cloud: 90%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 14 / 28 mph 46 / 40°F 92% 1005 mb
Low level cloud: 38%
Mid level cloud: 48%
High level cloud: 96%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
Jan		00:00

SSW
SSW

 11 / 22 mph 44 / 39°F 94% 1006 mb
Low level cloud: 68%
Mid level cloud: 22%
High level cloud: 41%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 12 / 26 mph 43 / 36°F 91% 1006 mb
Low level cloud: 93%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 12 / 25 mph 42 / 35°F 95% 1005 mb
Low level cloud: 67%
Mid level cloud: 100%
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

S
S

 13 / 26 mph 44 / 38°F 93% 1005 mb
Low level cloud: 51%
Mid level cloud: 98%
High level cloud: 90%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 19 / 35 mph 47 / 40°F 94% 1003 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSW
SSW

 17 / 26 mph 49 / 42°F 90% 1002 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 10 / 15 mph 47 / 43°F 95% 1003 mb
Low level cloud: 100%
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
21:00

NNW
NNW

 13 / 15 mph 45 / 39°F 92% 1006 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 14
Jan		00:00

NW
NW

 8 / 13 mph 42 / 37°F 85% 1008 mb
Low level cloud: 4%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NW
NW

 9 / 12 mph 41 / 35°F 88% 1010 mb
Low level cloud: 1%
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

WNW
WNW

 9 / 12 mph 39 / 33°F 85% 1012 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

W
W

 7 / 11 mph 38 / 32°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 7 / 10 mph 42 / 37°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 7 / 10 mph 42 / 37°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 10 / 15 mph 40 / 34°F 81% 1013 mb
Low level cloud: 0%
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
21:00

SSW
SSW

 11 / 18 mph 40 / 33°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
Jan		00:00

SSW
SSW

 13 / 17 mph 43 / 36°F 83% 1011 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 15 / 24 mph 41 / 33°F 86% 1009 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 14 / 28 mph 40 / 32°F 85% 1007 mb
Low level cloud: 86%
Mid level cloud: 44%
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

S
S

 17 / 26 mph 43 / 36°F 87% 1005 mb
Low level cloud: 81%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 21 / 24 mph 47 / 39°F 92% 1003 mb
Low level cloud: 98%
Mid level cloud: 100%
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

SSE
SSE

 23 / 26 mph 48 / 41°F 89% 999 mb
Low level cloud: 79%
Mid level cloud: 80%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSE
SSE

 28 / 43 mph 47 / 38°F 89% 996 mb
Low level cloud: 97%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

 20 / 40 mph 44 / 36°F 91% 995 mb
Low level cloud: 71%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 16
Jan		00:00

SW
SW

 18 / 33 mph 43 / 35°F 88% 998 mb
Low level cloud: 94%
Mid level cloud: 32%
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

SW
SW

 16 / 26 mph 42 / 34°F 88% 1001 mb
Low level cloud: 9%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 13 / 23 mph 41 / 34°F 91% 1003 mb
Low level cloud: 39%
Mid level cloud: 3%
High level cloud: 13%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 21 / 36 mph 43 / 34°F 85% 1004 mb
Low level cloud: 100%
Mid level cloud: 66%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 17 / 29 mph 45 / 37°F 84% 1005 mb
Low level cloud: 86%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 15 / 24 mph 46 / 39°F 86% 1005 mb
Low level cloud: 55%
Mid level cloud: 22%
High level cloud: 52%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 13 / 20 mph 45 / 38°F 90% 1006 mb
Low level cloud: 67%
Mid level cloud: 27%
High level cloud: 87%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 13 / 23 mph 44 / 37°F 91% 1007 mb
Low level cloud: 87%
Mid level cloud: 47%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 17
Jan		00:00

SSE
SSE

 13 / 24 mph 42 / 35°F 90% 1008 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 10 / 19 mph 41 / 35°F 91% 1008 mb
Low level cloud: 54%
Mid level cloud: 35%
High level cloud: 33%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 11 / 23 mph 40 / 34°F 85% 1009 mb
Low level cloud: 92%
Mid level cloud: 22%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 8 / 15 mph 42 / 37°F 87% 1010 mb
Low level cloud: 86%
Mid level cloud: 99%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 9 / 15 mph 44 / 39°F 80% 1011 mb
Low level cloud: 91%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 9 / 15 mph 45 / 39°F 86% 1011 mb
Low level cloud: 86%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 9 / 17 mph 44 / 39°F 85% 1012 mb
Low level cloud: 88%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 7 / 12 mph 43 / 39°F 87% 1013 mb
Low level cloud: 24%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 18
Jan		00:00

SSE
SSE

 12 / 20 mph 42 / 36°F 92% 994 mb
Low level cloud: 32%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
06:00

S
S

 23 / 40 mph 43 / 33°F 88% 997 mb
Low level cloud: 94%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 9 / 14 mph 42 / 36°F 79% 1019 mb
Low level cloud: 11%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
18:00

SE
SE

 8 / 12 mph 47 / 43°F 89% 1016 mb
Low level cloud: 37%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: low
56%
0.0 In
Mon 19
Jan		00:00

W
W

 9 / 14 mph 40 / 35°F 90% 992 mb
Low level cloud: 49%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
06:00

SSW
SSW

 14 / 27 mph 43 / 37°F 90% 992 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 9 / 14 mph 45 / 40°F 86% 1001 mb
Low level cloud: 85%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 6 / 11 mph 46 / 43°F 88% 1003 mb
Low level cloud: 26%
Mid level cloud: 79%
High level cloud: 49%
Most Significant Cloud Type: medium
100%
0.0 In
Tue 20
Jan		00:00

SW
SW

 13 / 27 mph 42 / 35°F 91% 1003 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ESE
ESE

 6 / 11 mph 42 / 38°F 91% 1007 mb
Low level cloud: 61%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 13 / 21 mph 44 / 38°F 85% 1010 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

SSE
SSE

 8 / 14 mph 47 / 43°F 98% 1007 mb
Low level cloud: 73%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Wed 21
Jan		00:00

WSW
WSW

 12 / 19 mph 41 / 34°F 90% 1015 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
06:00

SSE
SSE

 16 / 30 mph 46 / 39°F 96% 1002 mb
Low level cloud: 98%
Mid level cloud: 97%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.2 In
12:00

WSW
WSW

 13 / 20 mph 43 / 36°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
18:00

SSW
SSW

 11 / 20 mph 49 / 45°F 92% 1000 mb
Low level cloud: 26%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.2 In
Thu 22
Jan		00:00

SW
SW

 18 / 25 mph 46 / 39°F 90% 1017 mb
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
87%
0.0 In
06:00

SSW
SSW

 16 / 28 mph 44 / 37°F 91% 1003 mb
Low level cloud: 80%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
12:00

W
W

 8 / 16 mph 44 / 40°F 96% 1015 mb
Low level cloud: 78%
Mid level cloud: 15%
High level cloud: 57%
Most Significant Cloud Type: low
90%
0.1 In
18:00

SSW
SSW

 11 / 19 mph 46 / 40°F 93% 1010 mb
Low level cloud: 36%
Mid level cloud: 10%
High level cloud: 97%
Most Significant Cloud Type: low
51%
0.0 In
Fri 23
Jan		00:00

W
W

 9 / 13 mph 46 / 42°F 95% 1026 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
36%
0.0 In
06:00

S
S

 15 / 28 mph 44 / 37°F 92% 1011 mb
Low level cloud: 56%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
72%
0.0 In
12:00

SW
SW

 15 / 21 mph 48 / 43°F 81% 1029 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 30%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

S
S

 15 / 26 mph 48 / 42°F 83% 1013 mb
Low level cloud: 50%
Mid level cloud: 78%
High level cloud: 39%
Most Significant Cloud Type: low
82%
0.0 In
Sat 24
Jan		00:00

SW
SW

 17 / 27 mph 49 / 43°F 91% 1027 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: low
47%
0.0 In
06:00

S
S

 14 / 25 mph 46 / 40°F 86% 1013 mb
Low level cloud: 58%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 17 / 23 mph 54 / 50°F 86% 1025 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
0.0 In
18:00

S
S

 7 / 13 mph 50 / 47°F 90% 1012 mb
Low level cloud: 27%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
61%
0.0 In
Sun 25
Jan		00:00

W
W

 13 / 26 mph 45 / 38°F 90% 1026 mb
Low level cloud: 93%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 10 / 19 mph 45 / 40°F 90% 1006 mb
Low level cloud: 81%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 2 / 2 mph 51 / 51°F 78% 1030 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 36%
Most Significant Cloud Type: medium
74%
0.0 In
18:00

S
S

 21 / 37 mph 50 / 44°F 88% 1002 mb
Low level cloud: 88%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Mon 26
Jan		00:00

SSW
SSW

 17 / 35 mph 47 / 40°F 93% 1020 mb
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SW
SW

 25 / 48 mph 45 / 36°F 80% 1001 mb
Low level cloud: 62%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
65%
0.2 In
12:00

WSW
WSW

 19 / 26 mph 50 / 44°F 71% 1017 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 33%
Most Significant Cloud Type: medium
20%
0.0 In
18:00

W
W

 25 / 47 mph 48 / 40°F 85% 1005 mb
Low level cloud: 100%
Mid level cloud: 36%
High level cloud: 100%
Most Significant Cloud Type: low
100%
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