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Allegheny Reservoir 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

For Allegheny Reservoir in the coming two weeks the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 28°C expected on the afternoon of Monday 20th. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Saturday 25th at 5°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Friday 17th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		04:00

SE
SE

 5 / 10 mph 53 / 52°F 96%
Low level cloud: 47%
Mid level cloud: 18%
High level cloud: 89%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 7 / 9 mph 59 / 56°F 89%
Low level cloud: 36%
Mid level cloud: 42%
High level cloud: 20%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 9 / 10 mph 71 / 68°F 62%
Low level cloud: 29%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 5 / 8 mph 59 / 58°F 98%
Low level cloud: 80%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

SE
SE

 5 / 7 mph 59 / 58°F 99%
Low level cloud: 96%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
19:00

SSW
SSW

 4 / 6 mph 58 / 58°F 99%
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SSW
SSW

 4 / 7 mph 58 / 58°F 99%
Low level cloud: 99%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		01:00

SSW
SSW

 4 / 6 mph 58 / 58°F 99%
Low level cloud: 100%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSW
SSW

 3 / 5 mph 57 / 58°F 99%
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 2 / 3 mph 58 / 59°F 99%
Low level cloud: 97%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 2 / 3 mph 61 / 61°F 94%
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 3 / 4 mph 70 / 67°F 80%
Low level cloud: 34%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

NE
NE

 4 / 6 mph 70 / 67°F 88%
Low level cloud: 30%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

ESE
ESE

 2 / 4 mph 65 / 63°F 95%
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 2 / 4 mph 57 / 58°F 98%
Low level cloud: 51%
Mid level cloud: 6%
High level cloud: 0%
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

S
S

 3 / 6 mph 54 / 54°F 99%
Low level cloud: 86%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 2 / 4 mph 56 / 58°F 98%
Low level cloud: 54%
Mid level cloud: 3%
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

WSW
WSW

 2 / 2 mph 62 / 59°F 95%
Low level cloud: 38%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 2 / 3 mph 75 / 76°F 63%
Low level cloud: 63%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 4 / 4 mph 80 / 78°F 46%
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 8 / 9 mph 78 / 78°F 49%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 4 / 8 mph 69 / 66°F 88%
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 6 mph 60 / 60°F 96%
Low level cloud: 21%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

E
E

 2 / 4 mph 58 / 60°F 96%
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 3 / 6 mph 56 / 57°F 96%
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 2 / 3 mph 64 / 61°F 89%
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 3 / 4 mph 77 / 77°F 55%
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 4 / 5 mph 83 / 80°F 41%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 7 / 9 mph 82 / 80°F 45%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 4 mph 72 / 69°F 83%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 2 / 5 mph 62 / 62°F 93%
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

SSE
SSE

 4 / 7 mph 59 / 59°F 95%
Low level cloud: 16%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 4 / 9 mph 58 / 58°F 97%
Low level cloud: 43%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 8 mph 66 / 63°F 86%
Low level cloud: 4%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 9 / 10 mph 78 / 78°F 52%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 10 / 11 mph 83 / 81°F 41%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 8%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 8 / 11 mph 81 / 80°F 52%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 12%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 3 / 7 mph 72 / 68°F 91%
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 34%
Most Significant Cloud Type: medium
29%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SSE
SSE

 4 / 8 mph 63 / 63°F 95%
Low level cloud: 17%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SSE
SSE

 5 / 10 mph 61 / 60°F 96%
Low level cloud: 32%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 5 / 11 mph 59 / 59°F 97%
Low level cloud: 50%
Mid level cloud: 28%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 7 / 12 mph 66 / 64°F 92%
Low level cloud: 15%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 13 / 15 mph 79 / 80°F 60%
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 13 / 23 mph 74 / 77°F 88%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SW
SW

 15 / 24 mph 72 / 76°F 87%
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
37%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

S
S

 5 / 10 mph 69 / 67°F 90%
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 34%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 5 / 10 mph 62 / 62°F 98%
Low level cloud: 57%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SSE
SSE

 8 / 16 mph 62 / 62°F 97%
Low level cloud: 47%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 10 / 17 mph 64 / 64°F 95%
Low level cloud: 46%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 10 / 15 mph 65 / 65°F 95%
Low level cloud: 81%
Mid level cloud: 20%
High level cloud: 4%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 16 / 21 mph 70 / 69°F 84%
Low level cloud: 33%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 18 / 21 mph 76 / 78°F 54%
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 15 / 18 mph 64 / 64°F 73%
Low level cloud: 82%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 12 / 17 mph 57 / 53°F 79%
Low level cloud: 25%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 9 / 13 mph 52 / 49°F 76%
Low level cloud: 54%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		01:00

WSW
WSW

 3 / 6 mph 50 / 50°F 88%
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
07:00

NW
NW

 8 / 17 mph 45 / 40°F 94%
Low level cloud: 99%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 8 / 16 mph 80 / 79°F 34%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

S
S

 4 / 8 mph 66 / 66°F 68%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May		01:00

E
E

 1 / 3 mph 50 / 50°F 95%
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
6%
0.0 In
07:00

WNW
WNW

 6 / 14 mph 45 / 42°F 76%
Low level cloud: 82%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
13:00

S
S

 5 / 11 mph 77 / 78°F 41%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 3 / 6 mph 63 / 63°F 84%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 38%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 26
May		01:00

SSE
SSE

 12 / 25 mph 61 / 61°F 91%
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 19%
Most Significant Cloud Type: low
57%
0.0 In
07:00

SSW
SSW

 8 / 16 mph 60 / 60°F 99%
Low level cloud: 100%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
13:00

WSW
WSW

 12 / 26 mph 76 / 77°F 42%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: medium
4%
0.3 In
19:00

WSW
WSW

 2 / 5 mph 69 / 69°F 88%
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
Mon 27
May		01:00

WSW
WSW

 3 / 7 mph 55 / 55°F 96%
Low level cloud: 9%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
0.0 In
07:00

NNW
NNW

 1 / 1 mph 62 / 62°F 100%
Low level cloud: 99%
Mid level cloud: 93%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.4 In
13:00

W
W

 5 / 11 mph 71 / 71°F 47%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

NE
NE

 6 / 12 mph 58 / 57°F 98%
Low level cloud: 76%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: low
98%
0.8 In
Tue 28
May		01:00

NNE
NNE

 3 / 6 mph 51 / 51°F 97%
Low level cloud: 27%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: low
33%
0.0 In
07:00

NNE
NNE

 6 / 13 mph 57 / 56°F 98%
Low level cloud: 92%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.8 In
13:00

ENE
ENE

 8 / 16 mph 64 / 64°F 70%
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 5 / 11 mph 59 / 59°F 83%
Low level cloud: 12%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
Wed 29
May		01:00

E
E

 6 / 13 mph 55 / 53°F 99%
Low level cloud: 99%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NNE
NNE

 2 / 4 mph 56 / 57°F 91%
Low level cloud: 28%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
45%
0.0 In
13:00

W
W

 9 / 19 mph 60 / 60°F 94%
Low level cloud: 92%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.1 In
19:00

ENE
ENE

 5 / 11 mph 62 / 62°F 72%
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: medium
27%
0.0 In
Thu 30
May		01:00

S
S

 4 / 8 mph 48 / 47°F 98%
Low level cloud: 38%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
07:00

SE
SE

 11 / 23 mph 60 / 60°F 78%
Low level cloud: 3%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
13:00

WSW
WSW

 11 / 23 mph 67 / 67°F 51%
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
0.0 In
19:00

SE
SE

 15 / 32 mph 58 / 55°F 98%
Low level cloud: 94%
Mid level cloud: 78%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.3 In
Fri 31
May		01:00

S
S

 2 / 4 mph 53 / 54°F 95%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

SSE
SSE

 10 / 21 mph 54 / 50°F 97%
Low level cloud: 98%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SW
SW

 4 / 9 mph 75 / 76°F 36%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

SW
SW

 11 / 23 mph 49 / 45°F 98%
Low level cloud: 94%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		01:00

ESE
ESE

 5 / 10 mph 59 / 58°F 98%
Low level cloud: 77%
Mid level cloud: 56%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 13 / 28 mph 48 / 42°F 99%
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

W
W

 6 / 12 mph 62 / 62°F 98%
Low level cloud: 93%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.7 In
19:00

W
W

 11 / 23 mph 55 / 51°F 73%
Low level cloud: 23%
Mid level cloud: 32%
High level cloud: 14%
Most Significant Cloud Type: low
35%
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