Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

Local Weather

Poso/kasiguncu 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Poso/kasiguncu

Indonesia

Long range weather outlook for Poso/kasiguncu includes 14 day forecast summary:

The outlook for Poso/kasiguncu in the two weeks ahead shows the average daytime maximum temperature will be around 34°C, with a high for the two weeks of 35°C expected on the morning of Thursday 27th. The mean minimum temperature will be 22°C, dipping to its lowest on the morning of Saturday 29th at 20°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. It looks like Friday 28th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 27
Jan
20:00

S
S

5 / 10 mph 73 / 77°F 90% 1009 mb
Low level cloud: 5%
Mid level cloud: 43%
High level cloud: 64%
Most Significant Cloud Type: medium
58%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
23:00

S
S

4 / 8 mph 71 / 71°F 88% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: medium
45%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
Fri 28
Jan
02:00

SSW
SSW

3 / 7 mph 72 / 72°F 89% 1009 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
61%
Expect 0.11 In of precipitation over the past 3 hours.
0.11 In
05:00

SSW
SSW

2 / 4 mph 73 / 77°F 87% 1010 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 18%
Most Significant Cloud Type: medium
70%
Expect 0.10 In of precipitation over the past 3 hours.
0.10 In
08:00

S
S

2 / 3 mph 84 / 86°F 85% 1012 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 90%
Most Significant Cloud Type: medium
59%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
11:00

N
N

2 / 3 mph 87 / 96°F 78% 1011 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
79%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
14:00

SSW
SSW

2 / 4 mph 83 / 87°F 89% 1010 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 52%
Most Significant Cloud Type: medium
70%
Expect 0.17 In of precipitation over the past 3 hours.
0.17 In
17:00

SSE
SSE

3 / 4 mph 80 / 80°F 88% 1008 mb
Low level cloud: 1%
Mid level cloud: 50%
High level cloud: 9%
Most Significant Cloud Type: medium
53%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
20:00

SSE
SSE

2 / 5 mph 73 / 77°F 85% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: medium
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

S
S

3 / 6 mph 71 / 71°F 85% 1011 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
46%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Sat 29
Jan
02:00

SSW
SSW

4 / 9 mph 69 / 69°F 86% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: medium
47%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
05:00

SSW
SSW

4 / 9 mph 68 / 69°F 84% 1009 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 97%
Most Significant Cloud Type: medium
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

S
S

2 / 2 mph 86 / 90°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 95%
Most Significant Cloud Type: medium
26%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NNE
NNE

4 / 4 mph 92 / 102°F 66% 1010 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
14:00

NNE
NNE

4 / 4 mph 92 / 103°F 67% 1008 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 32%
Most Significant Cloud Type: medium
39%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
17:00

NE
NE

2 / 3 mph 91 / 101°F 71% 1007 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 20%
Most Significant Cloud Type: medium
31%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
20:00

S
S

2 / 3 mph 76 / 80°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

SSW
SSW

4 / 7 mph 74 / 78°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 75%
Most Significant Cloud Type: medium
47%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Sun 30
Jan
02:00

S
S

3 / 7 mph 73 / 77°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
05:00

S
S

4 / 8 mph 73 / 77°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
08:00

SSE
SSE

2 / 2 mph 82 / 82°F 73% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: medium
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

N
N

1 / 1 mph 91 / 100°F 68% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 56%
Most Significant Cloud Type: medium
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NE
NE

3 / 3 mph 92 / 103°F 69% 1008 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 85%
Most Significant Cloud Type: medium
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

ENE
ENE

1 / 2 mph 90 / 99°F 76% 1007 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

S
S

2 / 4 mph 77 / 81°F 81% 1010 mb
Low level cloud: 3%
Mid level cloud: 30%
High level cloud: 38%
Most Significant Cloud Type: medium
38%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

S
S

3 / 6 mph 74 / 78°F 82% 1010 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 69%
Most Significant Cloud Type: medium
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 31
Jan
02:00

S
S

3 / 6 mph 73 / 77°F 82% 1008 mb
Low level cloud: 16%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

S
S

3 / 6 mph 72 / 76°F 84% 1009 mb
Low level cloud: 24%
Mid level cloud: 32%
High level cloud: 16%
Most Significant Cloud Type: low
37%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
08:00

S
S

1 / 1 mph 88 / 94°F 77% 1010 mb
Low level cloud: 23%
Mid level cloud: 21%
High level cloud: 22%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NNE
NNE

4 / 4 mph 92 / 104°F 68% 1009 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 29%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NNE
NNE

5 / 6 mph 93 / 106°F 67% 1006 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
17:00

NNE
NNE

3 / 4 mph 91 / 104°F 71% 1006 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 18%
Most Significant Cloud Type: medium
9%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
20:00

SW
SW

0 / 1 mph 76 / 80°F 81% 1009 mb
Low level cloud: 14%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
22%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
23:00

S
S

3 / 7 mph 72 / 76°F 84% 1010 mb
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 64%
Most Significant Cloud Type: low
31%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Tue 01
Feb
02:00

SSW
SSW

3 / 7 mph 71 / 71°F 86% 1008 mb
Low level cloud: 16%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: low
20%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
05:00

SSW
SSW

3 / 7 mph 70 / 70°F 86% 1009 mb
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 66%
Most Significant Cloud Type: low
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

S
S

1 / 1 mph 88 / 94°F 76% 1010 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NE
NE

4 / 4 mph 92 / 103°F 67% 1009 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 94%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NE
NE

4 / 5 mph 94 / 106°F 63% 1007 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 13%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

NE
NE

3 / 4 mph 93 / 107°F 69% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 37%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

S
S

2 / 4 mph 76 / 79°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

S
S

4 / 7 mph 72 / 76°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 76%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 02
Feb
02:00

SSW
SSW

5 / 10 mph 71 / 71°F 76% 1008 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 52%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

S
S

4 / 9 mph 71 / 71°F 76% 1009 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 98%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

S
S

2 / 2 mph 87 / 90°F 70% 1010 mb
Low level cloud: 5%
Mid level cloud: 8%
High level cloud: 36%
Most Significant Cloud Type: low
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

NNE
NNE

4 / 4 mph 92 / 101°F 61% 1009 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

NNE
NNE

4 / 5 mph 92 / 102°F 66% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

N
N

2 / 2 mph 89 / 97°F 74% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 84%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SSW
SSW

3 / 5 mph 77 / 81°F 81% 1009 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 86%
Most Significant Cloud Type: medium
22%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

S
S

4 / 9 mph 74 / 78°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 03
Feb
02:00

SSW
SSW

4 / 8 mph 71 / 71°F 82% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 40%
Most Significant Cloud Type: medium
47%
0.02 In
08:00

SSW
SSW

3 / 4 mph 82 / 84°F 59% 1010 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 40%
Most Significant Cloud Type: medium
10%
0.00 In
14:00

NNE
NNE

6 / 7 mph 91 / 103°F 60% 1007 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 16%
Most Significant Cloud Type: medium
23%
0.00 In
20:00

S
S

3 / 4 mph 81 / 85°F 74% 1008 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 29%
Most Significant Cloud Type: medium
31%
0.00 In
Fri 04
Feb
02:00

S
S

4 / 9 mph 72 / 76°F 71% 1007 mb
Low level cloud: 15%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
26%
0.00 In
08:00

S
S

1 / 1 mph 86 / 94°F 65% 1009 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 8%
Most Significant Cloud Type: low
28%
0.00 In
14:00

NNE
NNE

6 / 7 mph 91 / 102°F 62% 1005 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 16%
Most Significant Cloud Type: medium
26%
0.01 In
20:00

SSW
SSW

3 / 3 mph 83 / 92°F 82% 1007 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: medium
42%
0.02 In
Sat 05
Feb
02:00

SSW
SSW

4 / 9 mph 72 / 76°F 79% 1006 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 21%
Most Significant Cloud Type: medium
34%
0.01 In
08:00

SSE
SSE

2 / 2 mph 85 / 94°F 73% 1009 mb
Low level cloud: 30%
Mid level cloud: 23%
High level cloud: 14%
Most Significant Cloud Type: low
40%
0.03 In
14:00

NNE
NNE

5 / 6 mph 91 / 106°F 64% 1004 mb
Low level cloud: 14%
Mid level cloud: 30%
High level cloud: 10%
Most Significant Cloud Type: low
25%
0.01 In
20:00

S
S

2 / 3 mph 78 / 82°F 81% 1007 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 17%
Most Significant Cloud Type: medium
53%
0.04 In
Sun 06
Feb
02:00

SSE
SSE

2 / 4 mph 76 / 80°F 77% 1006 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
23%
0.01 In
08:00

S
S

2 / 3 mph 85 / 94°F 75% 1010 mb
Low level cloud: 19%
Mid level cloud: 22%
High level cloud: 85%
Most Significant Cloud Type: low
36%
0.00 In
14:00

NNE
NNE

6 / 8 mph 90 / 104°F 67% 1005 mb
Low level cloud: 26%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
41%
0.04 In
20:00

SSE
SSE

1 / 2 mph 77 / 81°F 85% 1009 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 95%
Most Significant Cloud Type: low
50%
0.09 In
Mon 07
Feb
02:00

S
S

3 / 6 mph 75 / 78°F 77% 1006 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 94%
Most Significant Cloud Type: medium
29%
0.00 In
08:00

SSE
SSE

2 / 4 mph 82 / 91°F 84% 1010 mb
Low level cloud: 17%
Mid level cloud: 32%
High level cloud: 18%
Most Significant Cloud Type: low
30%
0.26 In
14:00

N
N

4 / 5 mph 90 / 104°F 69% 1006 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
33%
0.07 In
20:00

SE
SE

1 / 2 mph 76 / 80°F 87% 1009 mb
Low level cloud: 9%
Mid level cloud: 38%
High level cloud: 8%
Most Significant Cloud Type: medium
63%
0.06 In
Tue 08
Feb
02:00

SE
SE

6 / 11 mph 76 / 80°F 93% 1008 mb
Low level cloud: 25%
Mid level cloud: 51%
High level cloud: 46%
Most Significant Cloud Type: low
47%
0.21 In
08:00

S
S

2 / 2 mph 80 / 85°F 78% 1010 mb
Low level cloud: 5%
Mid level cloud: 38%
High level cloud: 11%
Most Significant Cloud Type: medium
52%
0.01 In
14:00

S
S

2 / 2 mph 83 / 94°F 91% 1009 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
41%
0.15 In
20:00

S
S

2 / 4 mph 78 / 82°F 82% 1008 mb
Low level cloud: 4%
Mid level cloud: 19%
High level cloud: 13%
Most Significant Cloud Type: medium
29%
0.01 In
Wed 09
Feb
02:00

S
S

2 / 4 mph 73 / 77°F 86% 1010 mb
Low level cloud: 13%
Mid level cloud: 26%
High level cloud: 34%
Most Significant Cloud Type: low
26%
0.00 In
08:00

S
S

2 / 2 mph 87 / 98°F 71% 1009 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
0.00 In
14:00

NNE
NNE

5 / 6 mph 91 / 107°F 67% 1007 mb
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 4%
Most Significant Cloud Type: medium
27%
0.02 In
20:00

S
S

3 / 4 mph 77 / 81°F 82% 1008 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
0.03 In
Thu 10
Feb
02:00

S
S

3 / 6 mph 73 / 77°F 82% 1008 mb
Low level cloud: 32%
Mid level cloud: 42%
High level cloud: 2%
Most Significant Cloud Type: low
47%
0.06 In
08:00

S
S

2 / 2 mph 86 / 96°F 74% 1010 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.01 In
14:00

NNE
NNE

5 / 6 mph 91 / 105°F 62% 1007 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: medium
24%
0.02 In
20:00

SW
SW

2 / 3 mph 77 / 82°F 87% 1009 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 17%
Most Significant Cloud Type: medium
39%
0.07 In
Fri 11
Feb
02:00

SSW
SSW

5 / 11 mph 72 / 76°F 84% 1009 mb
Low level cloud: 12%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
80%
0.06 In
08:00

SSE
SSE

2 / 2 mph 87 / 96°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 37%
Most Significant Cloud Type: medium
23%
0.00 In
14:00

N
N

6 / 8 mph 88 / 101°F 71% 1008 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
42%
0.05 In
20:00

S
S

2 / 3 mph 78 / 83°F 83% 1010 mb
Low level cloud: 8%
Mid level cloud: 40%
High level cloud: 10%
Most Significant Cloud Type: medium
63%
0.03 In

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