Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

Local Weather

Nordoyan (lgt-H) 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Nordoyan (lgt-H)

Norway

Long range weather outlook for Nordoyan (lgt-H) includes 14 day forecast summary:

Reviewing the forecast for Nordoyan (lgt-H) Over the next 14 days and the average daytime maximum temperature will be around 4°C, with a high for the two weeks of 6°C expected on the morning of Wednesday 3rd. The average minimum temperature will be 1°C, dipping to its lowest on the morning of Sunday 7th at -3°C. The coming 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. The current forecast indicates Monday 1st will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be strong. The strongest wind will be experienced on the morning of Monday 1st, coming from a westerly direction, and reaching around 38mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 01
Mar
22:00

WNW
WNW

26 / 42 mph 41 / 30°F 68% 1021 mb
Low level cloud: 86%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Tue 02
Mar
01:00

WNW
WNW

25 / 38 mph 41 / 30°F 69% 1024 mb
Low level cloud: 82%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
04:00

WNW
WNW

24 / 36 mph 41 / 31°F 68% 1025 mb
Low level cloud: 94%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
07:00

WNW
WNW

22 / 35 mph 41 / 31°F 68% 1026 mb
Low level cloud: 98%
Mid level cloud: 0%
High level cloud: 56%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
10:00

W
W

21 / 35 mph 40 / 31°F 68% 1027 mb
Low level cloud: 61%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
13:00

W
W

20 / 36 mph 40 / 30°F 69% 1027 mb
Low level cloud: 77%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
16:00

W
W

20 / 35 mph 40 / 30°F 73% 1026 mb
Low level cloud: 45%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: low
49%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
19:00

W
W

19 / 34 mph 40 / 31°F 77% 1026 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
22:00

W
W

22 / 38 mph 40 / 31°F 79% 1024 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: low
95%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Wed 03
Mar
01:00

WSW
WSW

18 / 31 mph 41 / 32°F 89% 1022 mb
Low level cloud: 95%
Mid level cloud: 58%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
04:00

W
W

29 / 52 mph 42 / 32°F 88% 1017 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
07:00

WNW
WNW

31 / 53 mph 41 / 29°F 91% 1016 mb
Low level cloud: 99%
Mid level cloud: 56%
High level cloud: 66%
Most Significant Cloud Type: low
100%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
10:00

NNW
NNW

28 / 38 mph 38 / 26°F 92% 1016 mb
Low level cloud: 89%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
13:00

NNW
NNW

27 / 35 mph 36 / 23°F 68% 1018 mb
Low level cloud: 76%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
77%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
16:00

NW
NW

26 / 33 mph 35 / 23°F 65% 1018 mb
Low level cloud: 93%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
19:00

NW
NW

26 / 34 mph 35 / 23°F 66% 1018 mb
Low level cloud: 57%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
22:00

NNW
NNW

21 / 29 mph 34 / 23°F 89% 1018 mb
Low level cloud: 67%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
Thu 04
Mar
01:00

N
N

28 / 53 mph 33 / 20°F 62% 1019 mb
Low level cloud: 71%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
04:00

NNW
NNW

28 / 51 mph 33 / 19°F 63% 1019 mb
Low level cloud: 64%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
07:00

NNW
NNW

29 / 51 mph 33 / 19°F 66% 1018 mb
Low level cloud: 50%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
10:00

NNE
NNE

17 / 23 mph 35 / 24°F 70% 1019 mb
Low level cloud: 61%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
13:00

NNW
NNW

21 / 26 mph 36 / 25°F 73% 1020 mb
Low level cloud: 65%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
16:00

NNW
NNW

23 / 31 mph 37 / 25°F 60% 1019 mb
Low level cloud: 11%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
19:00

N
N

26 / 35 mph 35 / 23°F 61% 1019 mb
Low level cloud: 24%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
22:00

N
N

21 / 30 mph 34 / 22°F 67% 1020 mb
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
Fri 05
Mar
01:00

NNW
NNW

11 / 15 mph 35 / 26°F 65% 1021 mb
Low level cloud: 34%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
04:00

NNW
NNW

19 / 28 mph 34 / 23°F 66% 1021 mb
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 11%
Most Significant Cloud Type: low
84%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
07:00

NNW
NNW

19 / 30 mph 34 / 23°F 62% 1021 mb
Low level cloud: 42%
Mid level cloud: 19%
High level cloud: 34%
Most Significant Cloud Type: low
52%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
10:00

NNW
NNW

15 / 19 mph 36 / 26°F 70% 1022 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
13:00

NW
NW

14 / 18 mph 37 / 29°F 65% 1021 mb
Low level cloud: 63%
Mid level cloud: 100%
High level cloud: 52%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
16:00

WNW
WNW

17 / 20 mph 38 / 28°F 65% 1020 mb
Low level cloud: 71%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
19:00

WSW
WSW

17 / 21 mph 37 / 27°F 84% 1017 mb
Low level cloud: 76%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
22:00

WSW
WSW

25 / 38 mph 35 / 23°F 96% 1013 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
Sat 06
Mar
01:00

WNW
WNW

33 / 56 mph 39 / 27°F 87% 1007 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.14 In of precipitation over the past 3 hours.
0.14 In
04:00

NW
NW

34 / 56 mph 38 / 25°F 85% 1005 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
07:00

NNW
NNW

33 / 54 mph 38 / 26°F 72% 1007 mb
Low level cloud: 97%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
10:00

NNW
NNW

30 / 49 mph 37 / 24°F 62% 1010 mb
Low level cloud: 49%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
60%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
13:00

NNW
NNW

31 / 46 mph 35 / 21°F 68% 1011 mb
Low level cloud: 95%
Mid level cloud: 80%
High level cloud: 27%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
16:00

NW
NW

32 / 41 mph 35 / 21°F 65% 1011 mb
Low level cloud: 92%
Mid level cloud: 21%
High level cloud: 83%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
19:00

NW
NW

34 / 41 mph 33 / 19°F 71% 1010 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
22:00

NNW
NNW

36 / 43 mph 30 / 14°F 83% 1010 mb
Low level cloud: 100%
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
Sun 07
Mar
01:00

NNW
NNW

31 / 37 mph 27 / 11°F 79% 1011 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
04:00

NNW
NNW

26 / 32 mph 27 / 12°F 72% 1012 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
07:00

NW
NW

28 / 33 mph 29 / 14°F 75% 1011 mb
Low level cloud: 100%
Mid level cloud: 61%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
10:00

WNW
WNW

33 / 49 mph 31 / 15°F 78% 1011 mb
Low level cloud: 90%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
13:00

NNE
NNE

26 / 45 mph 33 / 20°F 56% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
16:00

NNE
NNE

32 / 54 mph 33 / 19°F 48% 1014 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
19:00

NNE
NNE

28 / 49 mph 33 / 20°F 47% 1017 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
22:00

NNE
NNE

18 / 31 mph 32 / 21°F 57% 1020 mb
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 08
Mar
01:00

WNW
WNW

15 / 24 mph 41 / 33°F 83% 1009 mb
Low level cloud: 53%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
80%
0.03 In
07:00

W
W

14 / 27 mph 40 / 32°F 75% 1007 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 34%
Most Significant Cloud Type: low
65%
0.04 In
13:00

SW
SW

29 / 37 mph 41 / 30°F 92% 1007 mb
Low level cloud: 88%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.08 In
19:00

SSE
SSE

19 / 26 mph 34 / 23°F 97% 1006 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.11 In
Tue 09
Mar
01:00

SSE
SSE

16 / 21 mph 36 / 27°F 72% 1015 mb
Low level cloud: 65%
Mid level cloud: 61%
High level cloud: 97%
Most Significant Cloud Type: low
98%
0.00 In
07:00

SSW
SSW

21 / 45 mph 36 / 24°F 86% 995 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.32 In
13:00

SSE
SSE

18 / 22 mph 37 / 27°F 89% 1000 mb
Low level cloud: 99%
Mid level cloud: 48%
High level cloud: 57%
Most Significant Cloud Type: low
100%
0.01 In
19:00

SE
SE

15 / 19 mph 42 / 34°F 73% 992 mb
Low level cloud: 74%
Mid level cloud: 100%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.00 In
Wed 10
Mar
01:00

W
W

29 / 49 mph 39 / 28°F 80% 1016 mb
Low level cloud: 83%
Mid level cloud: 57%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.01 In
07:00

SW
SW

23 / 30 mph 39 / 28°F 89% 984 mb
Low level cloud: 80%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.06 In
13:00

WSW
WSW

31 / 46 mph 40 / 28°F 73% 1018 mb
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 55%
Most Significant Cloud Type: low
61%
0.04 In
19:00

SSE
SSE

11 / 16 mph 44 / 39°F 76% 975 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: low
11%
0.08 In
Thu 11
Mar
01:00

S
S

13 / 19 mph 37 / 28°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.00 In
07:00

NNE
NNE

23 / 43 mph 36 / 25°F 74% 973 mb
Low level cloud: 23%
Mid level cloud: 48%
High level cloud: 95%
Most Significant Cloud Type: low
51%
0.00 In
13:00

SW
SW

28 / 32 mph 43 / 32°F 61% 1003 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 98%
Most Significant Cloud Type: low
85%
0.00 In
19:00

NW
NW

29 / 35 mph 40 / 28°F 66% 986 mb
Low level cloud: 62%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
78%
0.02 In
Fri 12
Mar
01:00

SW
SW

29 / 56 mph 38 / 26°F 72% 995 mb
Low level cloud: 90%
Mid level cloud: 71%
High level cloud: 78%
Most Significant Cloud Type: low
100%
0.00 In
07:00

WNW
WNW

24 / 31 mph 32 / 19°F 63% 992 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 17%
Most Significant Cloud Type: low
90%
0.03 In
13:00

WSW
WSW

23 / 31 mph 44 / 35°F 71% 991 mb
Low level cloud: 12%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
34%
0.13 In
19:00

SW
SW

25 / 31 mph 38 / 27°F 72% 985 mb
Low level cloud: 36%
Mid level cloud: 50%
High level cloud: 95%
Most Significant Cloud Type: low
64%
0.28 In
Sat 13
Mar
01:00

SW
SW

28 / 55 mph 35 / 22°F 88% 988 mb
Low level cloud: 82%
Mid level cloud: 70%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.10 In
07:00

WNW
WNW

30 / 64 mph 27 / 11°F 57% 998 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: medium
84%
0.06 In
13:00

NNE
NNE

24 / 31 mph 39 / 28°F 78% 991 mb
Low level cloud: 69%
Mid level cloud: 87%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.12 In
19:00

WNW
WNW

27 / 54 mph 31 / 17°F 65% 1002 mb
Low level cloud: 45%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.07 In
Sun 14
Mar
01:00

N
N

28 / 40 mph 34 / 21°F 64% 1003 mb
Low level cloud: 78%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.00 In
07:00

NNW
NNW

32 / 66 mph 34 / 21°F 63% 1007 mb
Low level cloud: 29%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.08 In
13:00

NW
NW

18 / 27 mph 38 / 28°F 58% 1008 mb
Low level cloud: 2%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: medium
96%
0.08 In
19:00

NNW
NNW

15 / 31 mph 34 / 24°F 63% 1018 mb
Low level cloud: 18%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
32%
0.02 In
Mon 15
Mar
01:00

WSW
WSW

28 / 39 mph 34 / 20°F 96% 1004 mb
Low level cloud: 84%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.07 In
07:00

SW
SW

15 / 21 mph 38 / 29°F 93% 1020 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.01 In
13:00

N
N

28 / 36 mph 37 / 25°F 75% 1003 mb
Low level cloud: 62%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.04 In
19:00

WNW
WNW

10 / 21 mph 41 / 35°F 93% 1020 mb
Low level cloud: 45%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: low
81%
0.06 In
Tue 16
Mar
01:00

N
N

11 / 16 mph 32 / 23°F 66% 1005 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.05 In
07:00

WSW
WSW

9 / 19 mph 38 / 32°F 94% 1022 mb
Low level cloud: 53%
Mid level cloud: 45%
High level cloud: 93%
Most Significant Cloud Type: low
79%
0.01 In
13:00

NE
NE

17 / 22 mph 34 / 24°F 68% 1007 mb
Low level cloud: 68%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.03 In
19:00

SE
SE

12 / 15 mph 42 / 35°F 96% 1021 mb
Low level cloud: 75%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.00 In

Other Locations Near to Nordoyan (lgt-H)

Cities and Towns: Rorvik, Norway

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure