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Thunder Bay 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Thunder Bay

Michigan, United States Of America

Long range weather outlook for Thunder Bay includes 14 day forecast summary:

The forecast for Thunder Bay in the coming two weeks is predicting the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 21°C expected on the afternoon of Tuesday 27th. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Tuesday 20th at 3°C. The coming 14 days will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Predictions are Thursday 22nd will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 18
May		01:00

WNW
WNW

 14 / 20 mph 47 / 41°F 92% 1003 mb
Low level cloud: 100%
Mid level cloud: 24%
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

NW
NW

 13 / 23 mph 45 / 39°F 90% 1007 mb
Low level cloud: 95%
Mid level cloud: 45%
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

N
N

 12 / 19 mph 45 / 39°F 86% 1010 mb
Low level cloud: 95%
Mid level cloud: 54%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 11 / 13 mph 49 / 44°F 76% 1012 mb
Low level cloud: 79%
Mid level cloud: 53%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 9 / 10 mph 53 / 48°F 68% 1013 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 7 / 10 mph 53 / 49°F 66% 1014 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 7 / 11 mph 51 / 47°F 70% 1015 mb
Low level cloud: 45%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 8 / 10 mph 48 / 44°F 78% 1017 mb
Low level cloud: 29%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 19
May		19:00

NNW
NNW

 6 / 14 mph 48 / 44°F 52% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 82%
Most Significant Cloud Type: high
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 8 / 17 mph 42 / 37°F 58% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 20
May		01:00

ENE
ENE

 9 / 20 mph 40 / 33°F 67% 1022 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
04:00

NE
NE

 11 / 23 mph 38 / 31°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 12 / 18 mph 39 / 31°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 13 / 17 mph 42 / 35°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 13 / 15 mph 48 / 42°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 96%
Most Significant Cloud Type: high
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 8 / 9 mph 51 / 47°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 82%
Most Significant Cloud Type: high
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 4 / 7 mph 46 / 45°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 9 / 19 mph 42 / 36°F 61% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 21
May		01:00

NE
NE

 14 / 29 mph 45 / 38°F 63% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 14 / 23 mph 43 / 36°F 85% 1013 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 96%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 13 / 21 mph 44 / 37°F 85% 1013 mb
Low level cloud: 7%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 12 / 14 mph 48 / 43°F 73% 1014 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 31%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 9 / 12 mph 53 / 48°F 63% 1013 mb
Low level cloud: 45%
Mid level cloud: 51%
High level cloud: 38%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 11 / 13 mph 52 / 48°F 63% 1013 mb
Low level cloud: 16%
Mid level cloud: 84%
High level cloud: 3%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 9 / 13 mph 49 / 46°F 71% 1013 mb
Low level cloud: 12%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 12 / 14 mph 46 / 41°F 82% 1014 mb
Low level cloud: 72%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 22
May		01:00

NNW
NNW

 9 / 12 mph 42 / 36°F 90% 1014 mb
Low level cloud: 94%
Mid level cloud: 47%
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

NNW
NNW

 8 / 12 mph 40 / 35°F 85% 1014 mb
Low level cloud: 85%
Mid level cloud: 46%
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

NNW
NNW

 9 / 15 mph 40 / 34°F 83% 1014 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 9 / 11 mph 44 / 39°F 82% 1014 mb
Low level cloud: 95%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 10 / 11 mph 47 / 43°F 77% 1014 mb
Low level cloud: 93%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 12 / 14 mph 48 / 43°F 78% 1014 mb
Low level cloud: 81%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 11 / 13 mph 46 / 40°F 88% 1015 mb
Low level cloud: 95%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 11 / 13 mph 43 / 37°F 93% 1015 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 23
May		01:00

NW
NW

 11 / 12 mph 44 / 38°F 93% 1015 mb
Low level cloud: 98%
Mid level cloud: 65%
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

NW
NW

 11 / 14 mph 42 / 37°F 94% 1015 mb
Low level cloud: 100%
Mid level cloud: 44%
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

NW
NW

 11 / 17 mph 43 / 36°F 91% 1016 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 12 / 18 mph 45 / 40°F 81% 1016 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 12 / 15 mph 48 / 42°F 83% 1017 mb
Low level cloud: 87%
Mid level cloud: 60%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 11 / 15 mph 48 / 43°F 78% 1018 mb
Low level cloud: 75%
Mid level cloud: 47%
High level cloud: 6%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 10 / 16 mph 47 / 41°F 81% 1019 mb
Low level cloud: 48%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 9 / 15 mph 44 / 40°F 90% 1020 mb
Low level cloud: 45%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 24
May		01:00

NW
NW

 8 / 12 mph 44 / 40°F 93% 1021 mb
Low level cloud: 43%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 8 / 12 mph 44 / 40°F 94% 1021 mb
Low level cloud: 42%
Mid level cloud: 32%
High level cloud: 28%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 8 / 10 mph 46 / 41°F 90% 1023 mb
Low level cloud: 39%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 8 / 13 mph 50 / 46°F 70% 1023 mb
Low level cloud: 26%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 6 / 11 mph 53 / 49°F 63% 1023 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 4 / 8 mph 54 / 51°F 61% 1023 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 14%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 3 / 5 mph 52 / 50°F 70% 1024 mb
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
22:00

NW
NW

 6 / 12 mph 45 / 42°F 76% 1025 mb
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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 25
May		01:00

W
W

 8 / 16 mph 53 / 50°F 99% 1009 mb
Low level cloud: 89%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SE
SE

 6 / 12 mph 46 / 43°F 89% 1019 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: medium
75%
0.0 In
13:00

E
E

 6 / 9 mph 52 / 50°F 80% 1017 mb
Low level cloud: 26%
Mid level cloud: 61%
High level cloud: 67%
Most Significant Cloud Type: low
55%
0.0 In
19:00

E
E

 4 / 7 mph 54 / 53°F 75% 1018 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
Mon 26
May		01:00

W
W

 7 / 15 mph 40 / 35°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

S
S

 6 / 13 mph 47 / 44°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
66%
0.0 In
13:00

E
E

 7 / 12 mph 56 / 55°F 60% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 11%
Most Significant Cloud Type: high
10%
0.0 In
19:00

ESE
ESE

 6 / 10 mph 56 / 55°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Tue 27
May		01:00

NNW
NNW

 5 / 11 mph 45 / 42°F 80% 1021 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: medium
16%
0.0 In
07:00

W
W

 3 / 7 mph 50 / 50°F 85% 1019 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: medium
44%
0.0 In
13:00

E
E

 5 / 7 mph 57 / 57°F 65% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

SE
SE

 2 / 5 mph 55 / 56°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
Wed 28
May		01:00

WNW
WNW

 7 / 16 mph 44 / 40°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NW
NW

 9 / 15 mph 52 / 49°F 87% 1013 mb
Low level cloud: 2%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

N
N

 5 / 9 mph 66 / 66°F 48% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

NNW
NNW

 12 / 23 mph 54 / 51°F 66% 1014 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
0.0 In
Thu 29
May		01:00

W
W

 7 / 15 mph 48 / 45°F 81% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 96%
Most Significant Cloud Type: medium
47%
0.0 In
07:00

NW
NW

 11 / 17 mph 47 / 42°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNE
NNE

 9 / 13 mph 61 / 61°F 69% 1016 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 87%
Most Significant Cloud Type: low
34%
0.0 In
19:00

NW
NW

 10 / 21 mph 59 / 57°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 30
May		01:00

WSW
WSW

 7 / 14 mph 50 / 47°F 94% 1014 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
07:00

WSW
WSW

 11 / 23 mph 53 / 49°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 6%
Most Significant Cloud Type: medium
19%
0.0 In
13:00

WNW
WNW

 7 / 12 mph 72 / 76°F 50% 1010 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 2%
Most Significant Cloud Type: medium
23%
0.0 In
19:00

W
W

 13 / 28 mph 72 / 76°F 64% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 31
May		01:00

WSW
WSW

 9 / 18 mph 54 / 52°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

WNW
WNW

 8 / 17 mph 60 / 60°F 85% 1010 mb
Low level cloud: 6%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: medium
34%
0.0 In
13:00

WSW
WSW

 6 / 11 mph 69 / 69°F 75% 1008 mb
Low level cloud: 27%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.1 In
19:00

S
S

 4 / 8 mph 59 / 59°F 88% 1009 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 51%
Most Significant Cloud Type: medium
19%
0.1 In
Sun 01
Jun		01:00

WSW
WSW

 7 / 14 mph 54 / 52°F 86% 1009 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.1 In
07:00

ESE
ESE

 4 / 9 mph 49 / 47°F 94% 1014 mb
Low level cloud: 23%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.2 In
13:00

SE
SE

 11 / 22 mph 66 / 66°F 71% 1008 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
19:00

S
S

 4 / 7 mph 55 / 54°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
Mon 02
Jun		01:00

S
S

 6 / 12 mph 59 / 59°F 87% 1007 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
0.0 In
07:00

NE
NE

 6 / 12 mph 47 / 44°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: medium
10%
0.0 In
13:00

ENE
ENE

 19 / 38 mph 50 / 44°F 78% 1014 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

ENE
ENE

 5 / 10 mph 54 / 53°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: medium
15%
0.0 In

Other Locations Near to Thunder Bay

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