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Occoquan Reservoir 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Occoquan Reservoir

Virginia, United States Of America

Long range weather outlook for Occoquan Reservoir includes 14 day forecast summary:

The next 14 day outlook for Occoquan Reservoir shows the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 32°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Saturday 25th at 9°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. Current predictions suggest Saturday 18th will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		01:00

NE
NE

 2 / 4 mph 61 / 61°F 97% 1012 mb
Low level cloud: 32%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 3 / 7 mph 58 / 58°F 99% 1013 mb
Low level cloud: 66%
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
07:00

NE
NE

 3 / 4 mph 63 / 63°F 86% 1014 mb
Low level cloud: 96%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 1 / 1 mph 73 / 69°F 67% 1014 mb
Low level cloud: 64%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 1 / 1 mph 79 / 79°F 53% 1013 mb
Low level cloud: 48%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 2 / 3 mph 69 / 68°F 73% 1014 mb
Low level cloud: 75%
Mid level cloud: 44%
High level cloud: 78%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 5 / 7 mph 67 / 65°F 81% 1014 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 6 mph 63 / 63°F 80% 1014 mb
Low level cloud: 88%
Mid level cloud: 90%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		19:00

ENE
ENE

 3 / 4 mph 63 / 63°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 2 / 3 mph 61 / 61°F 99% 1016 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

E
E

 3 / 4 mph 59 / 60°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

ENE
ENE

 3 / 5 mph 57 / 57°F 99% 1015 mb
Low level cloud: 96%
Mid level cloud: 90%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

NE
NE

 3 / 4 mph 57 / 57°F 98% 1017 mb
Low level cloud: 99%
Mid level cloud: 87%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 4 mph 64 / 63°F 83% 1017 mb
Low level cloud: 92%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 4 / 5 mph 70 / 69°F 67% 1016 mb
Low level cloud: 96%
Mid level cloud: 28%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 4 / 6 mph 74 / 76°F 65% 1015 mb
Low level cloud: 58%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 2 / 4 mph 71 / 67°F 82% 1015 mb
Low level cloud: 35%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 3 mph 66 / 65°F 85% 1016 mb
Low level cloud: 5%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

SE
SE

 4 / 7 mph 59 / 59°F 97% 1016 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 3 / 6 mph 56 / 56°F 99% 1017 mb
Low level cloud: 59%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 1 / 1 mph 63 / 60°F 86% 1018 mb
Low level cloud: 49%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 4 / 4 mph 75 / 76°F 64% 1018 mb
Low level cloud: 68%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 4 / 5 mph 82 / 79°F 47% 1016 mb
Low level cloud: 48%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 4 / 6 mph 82 / 79°F 48% 1015 mb
Low level cloud: 6%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 6 mph 74 / 76°F 77% 1016 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 4 / 6 mph 68 / 68°F 89% 1016 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
Tue 21
May		01:00

SW
SW

 4 / 6 mph 61 / 61°F 95% 1016 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 4 / 7 mph 58 / 58°F 96% 1016 mb
Low level cloud: 4%
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
07:00

SSW
SSW

 4 / 6 mph 65 / 63°F 81% 1017 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 5 / 6 mph 78 / 78°F 54% 1016 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
13:00

S
S

 6 / 6 mph 85 / 82°F 39% 1015 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
16:00

SSE
SSE

 8 / 10 mph 85 / 82°F 40% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 8 / 11 mph 75 / 77°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 6 / 8 mph 67 / 67°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

S
S

 6 / 9 mph 62 / 62°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 6 / 11 mph 59 / 59°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 22%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 7 / 9 mph 69 / 66°F 78% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 9 / 10 mph 82 / 81°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 9 / 10 mph 89 / 89°F 42% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 9 / 12 mph 90 / 90°F 44% 1011 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 93%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 8 / 13 mph 82 / 83°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 93%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 9 / 14 mph 76 / 79°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 21%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SSW
SSW

 8 / 11 mph 74 / 77°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 6 / 10 mph 68 / 68°F 95% 1010 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 6 / 10 mph 73 / 69°F 90% 1010 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 6 / 8 mph 82 / 81°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 78%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 8 / 9 mph 81 / 82°F 61% 1010 mb
Low level cloud: 77%
Mid level cloud: 17%
High level cloud: 39%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 5 / 7 mph 81 / 81°F 81% 1010 mb
Low level cloud: 46%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

NW
NW

 4 / 8 mph 77 / 78°F 84% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 6 / 11 mph 67 / 67°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		01:00

NNW
NNW

 5 / 9 mph 63 / 63°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 92%
Most Significant Cloud Type: high
92%
0.0 In
07:00

NNW
NNW

 6 / 9 mph 73 / 77°F 61% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

 7 / 11 mph 90 / 89°F 30% 1014 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

 5 / 8 mph 80 / 83°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: medium
17%
0.0 In
Sat 25
May		01:00

NNE
NNE

 5 / 8 mph 74 / 78°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NNW
NNW

 7 / 14 mph 67 / 67°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

NNW
NNW

 9 / 15 mph 76 / 77°F 38% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
19:00

NNE
NNE

 4 / 6 mph 71 / 71°F 60% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 26
May		01:00

S
S

 8 / 15 mph 62 / 62°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

SSW
SSW

 5 / 9 mph 63 / 64°F 62% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
13:00

SW
SW

 11 / 19 mph 89 / 90°F 37% 1017 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 94%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

SE
SE

 9 / 15 mph 73 / 76°F 64% 1021 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Mon 27
May		01:00

SSW
SSW

 4 / 8 mph 69 / 69°F 98% 1018 mb
Low level cloud: 9%
Mid level cloud: 41%
High level cloud: 32%
Most Significant Cloud Type: medium
67%
0.3 In
07:00

SSW
SSW

 7 / 12 mph 70 / 71°F 82% 1019 mb
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
19%
0.0 In
13:00

SSW
SSW

 7 / 13 mph 88 / 92°F 51% 1015 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
19:00

SW
SW

 3 / 5 mph 78 / 84°F 93% 1013 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 29%
Most Significant Cloud Type: medium
29%
0.1 In
Tue 28
May		01:00

SSW
SSW

 8 / 15 mph 79 / 82°F 67% 1012 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 29%
Most Significant Cloud Type: medium
17%
0.0 In
07:00

NW
NW

 7 / 15 mph 73 / 77°F 89% 1014 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
6%
0.2 In
13:00

WSW
WSW

 12 / 22 mph 90 / 93°F 42% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

N
N

 4 / 8 mph 79 / 83°F 73% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
0.0 In
Wed 29
May		01:00

WNW
WNW

 5 / 9 mph 77 / 81°F 85% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.4 In
07:00

NE
NE

 4 / 8 mph 67 / 67°F 98% 1013 mb
Low level cloud: 62%
Mid level cloud: 58%
High level cloud: 16%
Most Significant Cloud Type: low
84%
0.8 In
13:00

W
W

 11 / 21 mph 87 / 85°F 29% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

ENE
ENE

 4 / 8 mph 67 / 67°F 99% 1012 mb
Low level cloud: 84%
Mid level cloud: 58%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.2 In
Thu 30
May		01:00

WNW
WNW

 6 / 11 mph 75 / 78°F 70% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NNW
NNW

 1 / 2 mph 68 / 68°F 95% 1012 mb
Low level cloud: 71%
Mid level cloud: 30%
High level cloud: 5%
Most Significant Cloud Type: low
81%
0.0 In
13:00

SSE
SSE

 1 / 1 mph 88 / 92°F 50% 1017 mb
Low level cloud: 6%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: low
9%
0.0 In
19:00

SSE
SSE

 5 / 11 mph 72 / 76°F 91% 1009 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 95%
Most Significant Cloud Type: low
44%
0.2 In
Fri 31
May		01:00

NE
NE

 5 / 10 mph 63 / 63°F 98% 1019 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.4 In
07:00

NW
NW

 7 / 14 mph 69 / 69°F 91% 1011 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.2 In
13:00

ENE
ENE

 9 / 18 mph 78 / 79°F 41% 1021 mb
Low level cloud: 7%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
19:00

NNW
NNW

 5 / 11 mph 72 / 76°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: medium
83%
0.0 In
Sat 01
Jun		01:00

SSW
SSW

 2 / 3 mph 64 / 64°F 90% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

NW
NW

 6 / 14 mph 62 / 62°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.1 In
13:00

SSE
SSE

 8 / 16 mph 80 / 78°F 30% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
19:00

WNW
WNW

 6 / 12 mph 67 / 67°F 62% 1014 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 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