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Spa 14 Day Long Range Forecast

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

Belgium

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

The next 14 day outlook for Spa shows the average daytime maximum temperature will be around 4°C, with a high for the two weeks of 9°C expected on the afternoon of Saturday 18th. The mean minimum temperature will be -2°C, dipping to its lowest on the morning of Saturday 11th at -8°C. The next 14 days will have mostly dry days although Wednesday 08th and Thursday 09th are likely to see a significant amount of rain or snow. The current forecast indicates Thursday 9th will have the most precipitation with an accumulation of around 21.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 08
Jan		19:00

E
E

 9 / 15 mph 32 / 24°F 98% 999 mb
Low level cloud: 84%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

SW
SW

 8 / 14 mph 40 / 35°F 99% 995 mb
Low level cloud: 99%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Thu 09
Jan		01:00

SW
SW

 11 / 20 mph 42 / 36°F 98% 996 mb
Low level cloud: 96%
Mid level cloud: 63%
High level cloud: 68%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
04:00

SW
SW

 15 / 26 mph 44 / 37°F 95% 996 mb
Low level cloud: 100%
Mid level cloud: 86%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 5 / 8 mph 41 / 37°F 97% 996 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 7 / 11 mph 34 / 28°F 99% 996 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
13:00

N
N

 14 / 22 mph 29 / 18°F 98% 1000 mb
Low level cloud: 89%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
16:00

WNW
WNW

 11 / 17 mph 29 / 19°F 98% 1007 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

W
W

 11 / 18 mph 29 / 19°F 97% 1013 mb
Low level cloud: 83%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 11 / 17 mph 28 / 18°F 96% 1017 mb
Low level cloud: 71%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 10
Jan		01:00

WSW
WSW

 9 / 15 mph 27 / 18°F 96% 1019 mb
Low level cloud: 75%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 7 / 12 mph 26 / 18°F 96% 1020 mb
Low level cloud: 61%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 5 / 9 mph 24 / 18°F 98% 1021 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 4 / 8 mph 26 / 21°F 96% 1022 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 5 / 7 mph 31 / 27°F 89% 1020 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 1 / 2 mph 31 / 31°F 96% 1020 mb
Low level cloud: 17%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 2 / 4 mph 28 / 26°F 97% 1020 mb
Low level cloud: 14%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 4 mph 27 / 25°F 97% 1021 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
Jan		01:00

ESE
ESE

 2 / 5 mph 23 / 19°F 97% 1023 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 3 / 6 mph 22 / 18°F 97% 1024 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 1 / 2 mph 28 / 28°F 94% 1025 mb
Low level cloud: 79%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 1 / 2 mph 28 / 28°F 95% 1027 mb
Low level cloud: 15%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 4 / 6 mph 30 / 26°F 92% 1028 mb
Low level cloud: 50%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 5 / 7 mph 29 / 24°F 93% 1030 mb
Low level cloud: 78%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 1 / 2 mph 26 / 26°F 97% 1033 mb
Low level cloud: 19%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 4 mph 23 / 22°F 98% 1036 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 12
Jan		01:00

ESE
ESE

 1 / 3 mph 22 / 22°F 99% 1037 mb
Low level cloud: 70%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 2 / 4 mph 24 / 21°F 99% 1039 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 3 / 5 mph 25 / 21°F 99% 1040 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 3 / 5 mph 27 / 24°F 96% 1042 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 4 / 7 mph 31 / 26°F 86% 1042 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 4 / 6 mph 29 / 25°F 97% 1042 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 4 / 7 mph 27 / 22°F 96% 1043 mb
Low level cloud: 75%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 3 / 6 mph 26 / 22°F 96% 1044 mb
Low level cloud: 39%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 13
Jan		01:00

SE
SE

 4 / 9 mph 23 / 18°F 96% 1043 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 3 / 7 mph 22 / 18°F 94% 1043 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 4 / 8 mph 23 / 18°F 90% 1042 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 3 / 6 mph 29 / 27°F 80% 1041 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 8%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 2 / 3 mph 36 / 35°F 78% 1039 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 21%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 2 / 4 mph 36 / 34°F 91% 1038 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 3 / 7 mph 29 / 26°F 88% 1039 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 9 mph 28 / 23°F 82% 1038 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 14
Jan		01:00

SSE
SSE

 4 / 9 mph 28 / 23°F 79% 1038 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 15%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 7 mph 29 / 25°F 81% 1037 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 97%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 5 / 11 mph 32 / 27°F 74% 1036 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
10:00

S
S

 4 / 8 mph 35 / 31°F 74% 1037 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 3 / 6 mph 39 / 37°F 80% 1036 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 20%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 3 / 5 mph 38 / 37°F 87% 1036 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 85%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 3 / 7 mph 36 / 33°F 84% 1037 mb
Low level cloud: 79%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 7 mph 37 / 35°F 92% 1037 mb
Low level cloud: 96%
Mid level cloud: 12%
High level cloud: 83%
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 15
Jan		01:00

SSE
SSE

 5 / 9 mph 33 / 28°F 84% 1037 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

SW
SW

 4 / 8 mph 33 / 29°F 97% 1033 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
13:00

ENE
ENE

 2 / 4 mph 41 / 40°F 93% 1036 mb
Low level cloud: 84%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
84%
0.0 In
19:00

E
E

 5 / 9 mph 43 / 40°F 96% 1037 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
Thu 16
Jan		01:00

E
E

 3 / 5 mph 38 / 36°F 98% 1038 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
18%
0.0 In
07:00

ESE
ESE

 4 / 6 mph 37 / 34°F 97% 1038 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
13:00

E
E

 3 / 4 mph 47 / 47°F 94% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
0.0 In
19:00

SE
SE

 2 / 3 mph 50 / 51°F 98% 1037 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Fri 17
Jan		01:00

SE
SE

 4 / 8 mph 42 / 39°F 84% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

ESE
ESE

 2 / 2 mph 40 / 40°F 91% 1035 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

SSE
SSE

 3 / 4 mph 53 / 53°F 80% 1035 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SE
SE

 3 / 5 mph 44 / 43°F 94% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 18
Jan		01:00

SE
SE

 4 / 8 mph 43 / 41°F 86% 1033 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

SE
SE

 3 / 7 mph 37 / 35°F 89% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 86%
Most Significant Cloud Type: high
85%
0.0 In
13:00

NNE
NNE

 2 / 3 mph 55 / 56°F 73% 1031 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

SE
SE

 4 / 7 mph 44 / 42°F 91% 1029 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
Sun 19
Jan		01:00

ENE
ENE

 4 / 6 mph 44 / 42°F 84% 1032 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
07:00

SE
SE

 4 / 8 mph 39 / 36°F 88% 1027 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

ENE
ENE

 5 / 6 mph 52 / 50°F 74% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

SE
SE

 4 / 5 mph 42 / 39°F 93% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
Mon 20
Jan		01:00

ESE
ESE

 6 / 8 mph 44 / 40°F 90% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SSE
SSE

 6 / 12 mph 36 / 31°F 83% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 79%
Most Significant Cloud Type: high
78%
0.0 In
13:00

SE
SE

 10 / 17 mph 41 / 35°F 58% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 6 / 11 mph 42 / 38°F 82% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
Tue 21
Jan		01:00

SE
SE

 5 / 8 mph 39 / 35°F 82% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SSE
SSE

 6 / 11 mph 41 / 36°F 94% 1026 mb
Low level cloud: 5%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
13:00

SSW
SSW

 6 / 9 mph 41 / 36°F 78% 1023 mb
Low level cloud: 38%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
19:00

SSE
SSE

 7 / 11 mph 43 / 38°F 96% 1022 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
23%
0.0 In
Wed 22
Jan		01:00

NW
NW

 6 / 9 mph 37 / 32°F 99% 1023 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.1 In
07:00

SSW
SSW

 17 / 28 mph 44 / 36°F 85% 1012 mb
Low level cloud: 21%
Mid level cloud: 27%
High level cloud: 29%
Most Significant Cloud Type: low
33%
0.0 In
13:00

N
N

 13 / 19 mph 33 / 23°F 87% 1027 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SSW
SSW

 23 / 36 mph 45 / 36°F 88% 997 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Thu 23
Jan		01:00

NNW
NNW

 4 / 6 mph 31 / 27°F 96% 1032 mb
Low level cloud: 99%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
07:00

ESE
ESE

 2 / 2 mph 39 / 39°F 98% 985 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
1.0 In
13:00

W
W

 6 / 9 mph 35 / 30°F 85% 1033 mb
Low level cloud: 51%
Mid level cloud: 33%
High level cloud: 47%
Most Significant Cloud Type: low
67%
0.0 In
19:00

SW
SW

 11 / 18 mph 31 / 22°F 90% 994 mb
Low level cloud: 44%
Mid level cloud: 87%
High level cloud: 14%
Most Significant Cloud Type: low
76%
0.4 In

Other Locations Near to Spa

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