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Mcmurray 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

For Mcmurray in the coming two weeks the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 30°C expected on the afternoon of Tuesday 21st. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Saturday 25th at 6°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Sunday 26th will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be light.

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

SSE
SSE

 4 / 9 mph 57 / 57°F 97%
Low level cloud: 9%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 10 mph 58 / 56°F 93%
Low level cloud: 22%
Mid level cloud: 28%
High level cloud: 8%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 5 / 8 mph 61 / 59°F 98%
Low level cloud: 48%
Mid level cloud: 78%
High level cloud: 17%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 9 / 11 mph 62 / 62°F 98%
Low level cloud: 91%
Mid level cloud: 85%
High level cloud: 30%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SSW
SSW

 6 / 8 mph 63 / 63°F 97%
Low level cloud: 77%
Mid level cloud: 83%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 5 / 8 mph 63 / 62°F 98%
Low level cloud: 47%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 5 / 8 mph 60 / 60°F 99%
Low level cloud: 67%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 18
May		01:00

S
S

 4 / 6 mph 58 / 59°F 99%
Low level cloud: 70%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SW
SW

 2 / 4 mph 58 / 59°F 99%
Low level cloud: 73%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 1 / 1 mph 62 / 60°F 97%
Low level cloud: 74%
Mid level cloud: 54%
High level cloud: 3%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 3 / 4 mph 64 / 64°F 92%
Low level cloud: 80%
Mid level cloud: 65%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 4 / 4 mph 77 / 77°F 67%
Low level cloud: 54%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 2 / 3 mph 77 / 77°F 73%
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 5 / 8 mph 69 / 66°F 93%
Low level cloud: 21%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 3 / 6 mph 62 / 62°F 96%
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

SE
SE

 3 / 6 mph 57 / 58°F 97%
Low level cloud: 22%
Mid level cloud: 12%
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

ESE
ESE

 3 / 6 mph 54 / 55°F 97%
Low level cloud: 27%
Mid level cloud: 16%
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

E
E

 3 / 4 mph 60 / 59°F 93%
Low level cloud: 27%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 3 / 3 mph 74 / 76°F 70%
Low level cloud: 69%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 3 / 3 mph 81 / 79°F 55%
Low level cloud: 21%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 1 / 1 mph 83 / 80°F 51%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 3 / 5 mph 74 / 76°F 78%
Low level cloud: 0%
Mid level cloud: 10%
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

NNE
NNE

 3 / 6 mph 64 / 64°F 89%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

E
E

 1 / 3 mph 60 / 60°F 93%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 59 / 60°F 95%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 0 / 1 mph 67 / 64°F 86%
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 5 / 6 mph 77 / 78°F 65%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 2 / 2 mph 85 / 83°F 52%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 2 / 2 mph 85 / 83°F 49%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 2 / 3 mph 78 / 78°F 77%
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
22:00

SE
SE

 3 / 6 mph 67 / 67°F 83%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

S
S

 4 / 8 mph 62 / 62°F 84%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 5 / 10 mph 59 / 59°F 85%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 8 mph 66 / 64°F 78%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 6 / 7 mph 79 / 78°F 60%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 6 / 6 mph 85 / 83°F 48%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 12%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 5 / 6 mph 87 / 85°F 47%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 1 / 3 mph 79 / 80°F 75%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 3 / 7 mph 71 / 71°F 78%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

S
S

 5 / 10 mph 66 / 66°F 82%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 5 / 11 mph 62 / 62°F 85%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 7%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 7 / 11 mph 70 / 67°F 79%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 11 / 13 mph 82 / 82°F 65%
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 11 / 13 mph 86 / 87°F 58%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 7 / 12 mph 85 / 86°F 65%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 3 / 7 mph 79 / 80°F 81%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 5 / 10 mph 71 / 71°F 85%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SSW
SSW

 9 / 19 mph 67 / 67°F 93%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 73%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 8 / 15 mph 66 / 66°F 94%
Low level cloud: 8%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 12 / 19 mph 71 / 69°F 87%
Low level cloud: 6%
Mid level cloud: 38%
High level cloud: 10%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 15 / 19 mph 72 / 76°F 79%
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 16 / 19 mph 77 / 78°F 63%
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 15 / 17 mph 75 / 77°F 66%
Low level cloud: 13%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 12 / 17 mph 66 / 65°F 74%
Low level cloud: 29%
Mid level cloud: 3%
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

WNW
WNW

 6 / 8 mph 64 / 64°F 82%
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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		01:00

SW
SW

 1 / 2 mph 61 / 61°F 85%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

W
W

 5 / 11 mph 60 / 60°F 79%
Low level cloud: 2%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: medium
60%
0.0 In
13:00

SW
SW

 7 / 15 mph 87 / 88°F 43%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

E
E

 5 / 11 mph 78 / 82°F 75%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Sat 25
May		01:00

ENE
ENE

 2 / 5 mph 68 / 68°F 96%
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
07:00

SSW
SSW

 2 / 5 mph 58 / 59°F 78%
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: low
7%
0.0 In
13:00

SSE
SSE

 4 / 8 mph 88 / 91°F 48%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SE
SE

 2 / 4 mph 76 / 79°F 76%
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
30%
0.0 In
Sun 26
May		01:00

SSW
SSW

 8 / 17 mph 72 / 72°F 73%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

SSW
SSW

 7 / 15 mph 65 / 65°F 98%
Low level cloud: 85%
Mid level cloud: 31%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.3 In
13:00

WSW
WSW

 10 / 21 mph 79 / 83°F 75%
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: low
52%
0.4 In
19:00

SW
SW

 5 / 11 mph 72 / 76°F 95%
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 4%
Most Significant Cloud Type: medium
47%
0.2 In
Mon 27
May		01:00

SW
SW

 3 / 6 mph 67 / 67°F 92%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
15%
0.0 In
07:00

SW
SW

 11 / 22 mph 65 / 65°F 97%
Low level cloud: 95%
Mid level cloud: 15%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.8 In
13:00

W
W

 5 / 11 mph 74 / 79°F 90%
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SW
SW

 7 / 15 mph 72 / 77°F 96%
Low level cloud: 40%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
67%
0.4 In
Tue 28
May		01:00

N
N

 4 / 8 mph 64 / 64°F 98%
Low level cloud: 75%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.6 In
07:00

NNW
NNW

 10 / 21 mph 60 / 60°F 98%
Low level cloud: 99%
Mid level cloud: 52%
High level cloud: 90%
Most Significant Cloud Type: low
100%
0.5 In
13:00

SSW
SSW

 4 / 9 mph 72 / 76°F 78%
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NW
NW

 6 / 12 mph 70 / 71°F 83%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
Wed 29
May		01:00

WNW
WNW

 5 / 10 mph 65 / 65°F 99%
Low level cloud: 85%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.1 In
07:00

NE
NE

 4 / 9 mph 62 / 62°F 89%
Low level cloud: 21%
Mid level cloud: 8%
High level cloud: 24%
Most Significant Cloud Type: low
26%
0.0 In
13:00

W
W

 9 / 18 mph 68 / 68°F 71%
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
19:00

ENE
ENE

 2 / 4 mph 76 / 79°F 75%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Thu 30
May		01:00

SW
SW

 5 / 10 mph 60 / 60°F 93%
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
07:00

SE
SE

 10 / 22 mph 66 / 66°F 81%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
13:00

W
W

 11 / 23 mph 72 / 76°F 66%
Low level cloud: 56%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
19:00

SSE
SSE

 10 / 22 mph 62 / 62°F 98%
Low level cloud: 88%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
Fri 31
May		01:00

S
S

 2 / 5 mph 66 / 66°F 95%
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: medium
10%
0.1 In
07:00

SSW
SSW

 10 / 21 mph 56 / 54°F 97%
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ESE
ESE

 4 / 8 mph 79 / 81°F 59%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

WSW
WSW

 14 / 29 mph 53 / 48°F 94%
Low level cloud: 93%
Mid level cloud: 84%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
Sat 01
Jun		01:00

SE
SE

 8 / 16 mph 64 / 64°F 98%
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
07:00

W
W

 13 / 28 mph 51 / 47°F 79%
Low level cloud: 100%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

WSW
WSW

 9 / 19 mph 73 / 77°F 75%
Low level cloud: 41%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.1 In
19:00

WNW
WNW

 5 / 11 mph 67 / 67°F 79%
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 33%
Most Significant Cloud Type: medium
24%
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