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Marsh Creek Reservoir 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

The outlook for Marsh Creek Reservoir in the two weeks ahead shows the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 29°C expected on the afternoon of Thursday 23rd. The average minimum temperature will be 13°C, dipping to its lowest on the morning of Saturday 25th at 9°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Predictions are Saturday 18th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

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

NNE
NNE

 5 / 7 mph 58 / 58°F 91%
Low level cloud: 91%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 8 / 9 mph 61 / 59°F 84%
Low level cloud: 13%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 6 / 7 mph 67 / 67°F 71%
Low level cloud: 96%
Mid level cloud: 10%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 6 / 7 mph 68 / 68°F 68%
Low level cloud: 87%
Mid level cloud: 21%
High level cloud: 22%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 6 / 8 mph 68 / 68°F 71%
Low level cloud: 96%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 6 / 9 mph 63 / 63°F 80%
Low level cloud: 76%
Mid level cloud: 45%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 6 / 9 mph 61 / 61°F 85%
Low level cloud: 47%
Mid level cloud: 54%
High level cloud: 21%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		01:00

SSE
SSE

 4 / 7 mph 57 / 57°F 88%
Low level cloud: 40%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 4 / 6 mph 56 / 56°F 92%
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 66%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 2 / 2 mph 55 / 55°F 97%
Low level cloud: 81%
Mid level cloud: 96%
High level cloud: 90%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

E
E

 4 / 5 mph 57 / 57°F 97%
Low level cloud: 79%
Mid level cloud: 100%
High level cloud: 26%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

ENE
ENE

 4 / 4 mph 60 / 59°F 97%
Low level cloud: 89%
Mid level cloud: 83%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

ENE
ENE

 4 / 4 mph 60 / 60°F 95%
Low level cloud: 82%
Mid level cloud: 61%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 3 / 4 mph 60 / 59°F 96%
Low level cloud: 66%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 2 / 2 mph 58 / 58°F 96%
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

N
N

 3 / 4 mph 54 / 55°F 96%
Low level cloud: 56%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 4 / 7 mph 53 / 52°F 97%
Low level cloud: 51%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 5 / 6 mph 59 / 56°F 91%
Low level cloud: 45%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 5 / 6 mph 68 / 66°F 71%
Low level cloud: 76%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 5 / 6 mph 72 / 76°F 65%
Low level cloud: 69%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 2 / 3 mph 74 / 76°F 66%
Low level cloud: 15%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 1 / 2 mph 68 / 65°F 84%
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
22:00

SSE
SSE

 6 / 12 mph 56 / 55°F 96%
Low level cloud: 27%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

S
S

 3 / 6 mph 53 / 53°F 96%
Low level cloud: 51%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 52 / 52°F 97%
Low level cloud: 79%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 3 / 4 mph 59 / 58°F 88%
Low level cloud: 70%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 2 / 3 mph 66 / 66°F 78%
Low level cloud: 92%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 2 / 3 mph 73 / 69°F 74%
Low level cloud: 69%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 3 / 3 mph 76 / 77°F 69%
Low level cloud: 65%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 2 / 5 mph 70 / 67°F 86%
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
22:00

S
S

 5 / 10 mph 59 / 59°F 95%
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

S
S

 4 / 9 mph 55 / 54°F 97%
Low level cloud: 40%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 4 / 7 mph 53 / 53°F 97%
Low level cloud: 49%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 5 / 6 mph 64 / 60°F 90%
Low level cloud: 52%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 6 mph 75 / 76°F 71%
Low level cloud: 23%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 6 / 7 mph 80 / 80°F 62%
Low level cloud: 11%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 8 / 10 mph 79 / 80°F 63%
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
19:00

S
S

 8 / 9 mph 73 / 76°F 86%
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
22:00

S
S

 6 / 7 mph 64 / 65°F 91%
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
Wed 22
May		01:00

SSW
SSW

 4 / 8 mph 56 / 56°F 94%
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 4 / 8 mph 54 / 54°F 94%
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 6 / 7 mph 64 / 62°F 82%
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
10:00

SSW
SSW

 8 / 9 mph 75 / 77°F 63%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 9 / 10 mph 81 / 80°F 57%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 9 / 11 mph 81 / 81°F 62%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 8 / 14 mph 72 / 70°F 80%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 99%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 4 / 6 mph 64 / 64°F 94%
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 98%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

S
S

 5 / 10 mph 62 / 62°F 93%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 25%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 6 / 11 mph 61 / 61°F 97%
Low level cloud: 14%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 9 / 13 mph 68 / 66°F 94%
Low level cloud: 50%
Mid level cloud: 14%
High level cloud: 12%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 11 / 12 mph 79 / 80°F 76%
Low level cloud: 46%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 13 / 15 mph 83 / 86°F 67%
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 33%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 13 / 21 mph 81 / 83°F 75%
Low level cloud: 5%
Mid level cloud: 22%
High level cloud: 90%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 7 / 12 mph 76 / 77°F 85%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 62%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 8 / 14 mph 69 / 69°F 81%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
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

NNW
NNW

 8 / 16 mph 58 / 57°F 69%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: high
98%
0.0 In
07:00

WNW
WNW

 11 / 15 mph 63 / 63°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

SW
SW

 8 / 12 mph 83 / 85°F 50%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSW
SSW

 4 / 7 mph 74 / 77°F 71%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
0.0 In
Sat 25
May		01:00

NNE
NNE

 5 / 10 mph 60 / 60°F 94%
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
0.0 In
07:00

NW
NW

 12 / 20 mph 54 / 51°F 68%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

E
E

 8 / 17 mph 70 / 71°F 61%
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
19:00

SSE
SSE

 4 / 7 mph 69 / 69°F 74%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: medium
10%
0.0 In
Sun 26
May		01:00

SE
SE

 7 / 15 mph 54 / 52°F 92%
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
07:00

S
S

 8 / 15 mph 64 / 64°F 93%
Low level cloud: 28%
Mid level cloud: 35%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.1 In
13:00

SSE
SSE

 9 / 19 mph 68 / 68°F 87%
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.1 In
19:00

SSW
SSW

 4 / 8 mph 78 / 82°F 85%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 17%
Most Significant Cloud Type: medium
21%
0.0 In
Mon 27
May		01:00

S
S

 4 / 8 mph 64 / 64°F 99%
Low level cloud: 56%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSW
SSW

 10 / 21 mph 69 / 69°F 93%
Low level cloud: 41%
Mid level cloud: 20%
High level cloud: 21%
Most Significant Cloud Type: low
50%
0.0 In
13:00

WSW
WSW

 4 / 8 mph 82 / 86°F 67%
Low level cloud: 71%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: low
77%
0.1 In
19:00

SW
SW

 3 / 6 mph 73 / 78°F 92%
Low level cloud: 43%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
83%
0.1 In
Tue 28
May		01:00

NNW
NNW

 4 / 8 mph 68 / 68°F 97%
Low level cloud: 76%
Mid level cloud: 29%
High level cloud: 93%
Most Significant Cloud Type: low
96%
0.2 In
07:00

SW
SW

 6 / 12 mph 70 / 70°F 95%
Low level cloud: 74%
Mid level cloud: 17%
High level cloud: 96%
Most Significant Cloud Type: low
91%
0.4 In
13:00

NE
NE

 3 / 7 mph 71 / 71°F 94%
Low level cloud: 79%
Mid level cloud: 75%
High level cloud: 69%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNW
NNW

 14 / 30 mph 64 / 64°F 84%
Low level cloud: 95%
Mid level cloud: 50%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.2 In
Wed 29
May		01:00

E
E

 6 / 14 mph 63 / 63°F 98%
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
07:00

N
N

 6 / 12 mph 62 / 62°F 88%
Low level cloud: 90%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
13:00

E
E

 9 / 18 mph 65 / 65°F 96%
Low level cloud: 99%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

S
S

 5 / 11 mph 67 / 67°F 83%
Low level cloud: 55%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
Thu 30
May		01:00

NNE
NNE

 1 / 3 mph 61 / 60°F 95%
Low level cloud: 79%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
07:00

SE
SE

 4 / 7 mph 64 / 64°F 88%
Low level cloud: 26%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
13:00

WSW
WSW

 5 / 11 mph 73 / 77°F 60%
Low level cloud: 57%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
59%
0.0 In
19:00

SE
SE

 13 / 27 mph 62 / 62°F 79%
Low level cloud: 6%
Mid level cloud: 26%
High level cloud: 98%
Most Significant Cloud Type: medium
45%
0.0 In
Fri 31
May		01:00

WSW
WSW

 4 / 8 mph 62 / 62°F 90%
Low level cloud: 10%
Mid level cloud: 37%
High level cloud: 49%
Most Significant Cloud Type: medium
67%
0.0 In
07:00

E
E

 8 / 17 mph 56 / 54°F 99%
Low level cloud: 100%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SSW
SSW

 6 / 13 mph 80 / 82°F 56%
Low level cloud: 29%
Mid level cloud: 15%
High level cloud: 49%
Most Significant Cloud Type: low
39%
0.0 In
19:00

W
W

 11 / 22 mph 60 / 60°F 88%
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
0.1 In
Sat 01
Jun		01:00

ESE
ESE

 5 / 11 mph 66 / 66°F 98%
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
68%
0.2 In
07:00

W
W

 14 / 30 mph 58 / 55°F 78%
Low level cloud: 71%
Mid level cloud: 40%
High level cloud: 5%
Most Significant Cloud Type: low
85%
0.0 In
13:00

SSW
SSW

 8 / 17 mph 69 / 69°F 97%
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

W
W

 4 / 9 mph 65 / 65°F 78%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 22%
Most Significant Cloud Type: medium
7%
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