WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Waldo 14 Day Long Range Forecast

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

Arkansas, United States Of America

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

The next 14 day outlook for Waldo shows the average daytime maximum temperature will be around 33°C, with a high for the two weeks of 38°C expected on the afternoon of Monday 27th. The mean minimum temperature will be 19°C, dipping to its lowest on the morning of Tuesday 28th at 14°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Wednesday 22nd will have the most precipitation with an accumulation of around 54.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May
00:00

S
S

6 / 13 mph 72 / 76°F 83% 1011 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
03:00

S
S

6 / 13 mph 70 / 70°F 84% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 77%
Most Significant Cloud Type: high
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

7 / 13 mph 69 / 69°F 89% 1011 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

11 / 13 mph 81 / 82°F 66% 1011 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 59%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

12 / 13 mph 88 / 91°F 60% 1010 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

11 / 13 mph 88 / 91°F 63% 1009 mb
Low level cloud: 45%
Mid level cloud: 31%
High level cloud: 7%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

11 / 18 mph 82 / 86°F 82% 1009 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

10 / 16 mph 78 / 83°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 91%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
18:00

SSE
SSE

5 / 11 mph 79 / 80°F 90% 1009 mb
Low level cloud: 17%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
44%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

ESE
ESE

5 / 10 mph 65 / 65°F 99% 1013 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 70%
Most Significant Cloud Type: low
100%
Expect 1.8 In of precipitation over the past 3 hours.
1.8 In
Thu 23
May
00:00

ESE
ESE

7 / 13 mph 66 / 66°F 99% 1014 mb
Low level cloud: 80%
Mid level cloud: 54%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

ESE
ESE

9 / 14 mph 66 / 66°F 98% 1012 mb
Low level cloud: 80%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

5 / 7 mph 67 / 67°F 98% 1013 mb
Low level cloud: 91%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

6 / 8 mph 75 / 77°F 91% 1013 mb
Low level cloud: 81%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

8 / 9 mph 85 / 87°F 68% 1012 mb
Low level cloud: 70%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

5 / 6 mph 90 / 93°F 56% 1009 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 47%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

5 / 9 mph 81 / 82°F 90% 1009 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: medium
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ESE
ESE

6 / 11 mph 71 / 71°F 96% 1009 mb
Low level cloud: 16%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SE
SE

7 / 14 mph 70 / 70°F 96% 1008 mb
Low level cloud: 28%
Mid level cloud: 7%
High level cloud: 20%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

1 / 2 mph 69 / 69°F 98% 1008 mb
Low level cloud: 63%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

6 / 11 mph 69 / 69°F 99% 1009 mb
Low level cloud: 64%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

9 / 12 mph 76 / 79°F 86% 1009 mb
Low level cloud: 88%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

12 / 13 mph 90 / 94°F 51% 1008 mb
Low level cloud: 32%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

10 / 12 mph 94 / 99°F 47% 1006 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

4 / 8 mph 87 / 96°F 70% 1006 mb
Low level cloud: 14%
Mid level cloud: 50%
High level cloud: 98%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

3 / 7 mph 76 / 81°F 92% 1008 mb
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

S
S

5 / 11 mph 73 / 78°F 97% 1008 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 18%
Most Significant Cloud Type: low
11%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSW
SSW

4 / 8 mph 72 / 77°F 98% 1007 mb
Low level cloud: 26%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSW
SSW

6 / 10 mph 72 / 76°F 99% 1009 mb
Low level cloud: 66%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
67%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSW
SSW

7 / 9 mph 85 / 87°F 73% 1010 mb
Low level cloud: 41%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

9 / 11 mph 93 / 96°F 45% 1008 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

11 / 13 mph 95 / 99°F 43% 1005 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 36%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

7 / 13 mph 89 / 94°F 63% 1004 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 85%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

13 / 22 mph 84 / 87°F 60% 1004 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

S
S

10 / 20 mph 73 / 77°F 92% 1004 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

S
S

11 / 19 mph 70 / 70°F 97% 1004 mb
Low level cloud: 33%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

12 / 19 mph 72 / 77°F 97% 1005 mb
Low level cloud: 85%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

14 / 16 mph 84 / 89°F 70% 1005 mb
Low level cloud: 75%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

14 / 16 mph 94 / 101°F 51% 1004 mb
Low level cloud: 36%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

13 / 15 mph 96 / 104°F 45% 1003 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

8 / 14 mph 89 / 97°F 67% 1003 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

5 / 11 mph 78 / 84°F 91% 1004 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

S
S

6 / 12 mph 75 / 81°F 98% 1005 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

7 / 12 mph 73 / 78°F 97% 1005 mb
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

6 / 10 mph 73 / 78°F 99% 1007 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

9 / 13 mph 80 / 86°F 85% 1007 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

11 / 13 mph 97 / 106°F 46% 1006 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
15:00

WSW
WSW

14 / 16 mph 100 / 106°F 37% 1004 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

12 / 20 mph 84 / 86°F 58% 1006 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
21:00

NW
NW

13 / 19 mph 71 / 71°F 73% 1010 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 28
May
00:00

SSW
SSW

7 / 15 mph 77 / 81°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

ENE
ENE

3 / 7 mph 70 / 70°F 97% 1017 mb
Low level cloud: 19%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNE
NNE

7 / 15 mph 86 / 85°F 34% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

N
N

7 / 16 mph 78 / 79°F 53% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 29
May
00:00

NNW
NNW

6 / 13 mph 60 / 60°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NW
NW

4 / 9 mph 58 / 58°F 89% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

N
N

6 / 12 mph 80 / 80°F 42% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ENE
ENE

3 / 6 mph 80 / 83°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: medium
6%
0.0 In
Thu 30
May
00:00

SSE
SSE

5 / 11 mph 62 / 62°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

E
E

1 / 2 mph 62 / 62°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

SSE
SSE

6 / 13 mph 84 / 84°F 39% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

N
N

2 / 4 mph 79 / 82°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 93%
Most Significant Cloud Type: medium
50%
0.0 In
Fri 31
May
00:00

SSE
SSE

5 / 11 mph 65 / 65°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

ESE
ESE

6 / 14 mph 64 / 64°F 81% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 13%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

S
S

8 / 17 mph 87 / 86°F 34% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ESE
ESE

7 / 16 mph 80 / 83°F 61% 1012 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 2%
Most Significant Cloud Type: medium
32%
0.0 In
Sat 01
Jun
00:00

S
S

7 / 15 mph 72 / 76°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: high
20%
0.0 In
06:00

ESE
ESE

6 / 12 mph 66 / 66°F 99% 1014 mb
Low level cloud: 74%
Mid level cloud: 33%
High level cloud: 8%
Most Significant Cloud Type: low
86%
0.2 In
12:00

SSE
SSE

10 / 20 mph 87 / 87°F 36% 1015 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 17%
Most Significant Cloud Type: medium
14%
0.0 In
18:00

ESE
ESE

8 / 16 mph 67 / 67°F 98% 1013 mb
Low level cloud: 100%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.2 In
Sun 02
Jun
00:00

SSW
SSW

6 / 13 mph 73 / 77°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: medium
11%
0.0 In
06:00

NNE
NNE

4 / 9 mph 67 / 67°F 99% 1017 mb
Low level cloud: 99%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SSW
SSW

8 / 16 mph 81 / 84°F 68% 1017 mb
Low level cloud: 62%
Mid level cloud: 10%
High level cloud: 53%
Most Significant Cloud Type: low
72%
0.0 In
18:00

NNE
NNE

6 / 12 mph 76 / 79°F 74% 1017 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
Mon 03
Jun
00:00

NNW
NNW

5 / 10 mph 71 / 71°F 86% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 24%
Most Significant Cloud Type: medium
11%
0.0 In
06:00

NE
NE

2 / 5 mph 65 / 65°F 96% 1018 mb
Low level cloud: 39%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
12:00

NNE
NNE

7 / 15 mph 84 / 88°F 59% 1019 mb
Low level cloud: 73%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
18:00

ENE
ENE

3 / 6 mph 79 / 83°F 74% 1014 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 3%
Most Significant Cloud Type: medium
28%
0.0 In
Tue 04
Jun
00:00

ENE
ENE

5 / 10 mph 65 / 65°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.2 In
06:00

ESE
ESE

6 / 13 mph 67 / 67°F 98% 1012 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 98%
Most Significant Cloud Type: low
77%
0.1 In
12:00

ENE
ENE

7 / 15 mph 82 / 81°F 37% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 44%
Most Significant Cloud Type: medium
8%
0.0 In
18:00

ESE
ESE

6 / 13 mph 74 / 78°F 99% 1011 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.3 In
Wed 05
Jun
00:00

E
E

5 / 11 mph 65 / 65°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 6%
Most Significant Cloud Type: medium
35%
0.0 In
06:00

ENE
ENE

3 / 6 mph 65 / 65°F 99% 1014 mb
Low level cloud: 79%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
12:00

E
E

9 / 20 mph 73 / 76°F 48% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: medium
45%
0.0 In
18:00

ESE
ESE

3 / 7 mph 79 / 83°F 75% 1014 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 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