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Six Flags 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Six Flags

Maryland, United States Of America

Long range weather outlook for Six Flags includes 14 day forecast summary:

Over the next 14 days the Six Flags forecast suggests 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 Tuesday 4th. The mean minimum temperature will be 16°C, dipping to its lowest on the morning of Friday 31st at 11°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Friday 7th will have the most precipitation with an accumulation of around 26.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 28
May		01:00

W
W

 7 / 14 mph 68 / 68°F 85% 1008 mb
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
04:00

WNW
WNW

 9 / 17 mph 64 / 64°F 86% 1009 mb
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
07:00

WNW
WNW

 8 / 11 mph 70 / 68°F 70% 1011 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
10:00

WNW
WNW

 11 / 13 mph 78 / 78°F 50% 1011 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 7 / 10 mph 80 / 79°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 6 / 10 mph 78 / 77°F 50% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 7 / 14 mph 74 / 76°F 59% 1012 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 6 / 10 mph 66 / 66°F 65% 1013 mb
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
Wed 29
May		19:00

NNE
NNE

 3 / 4 mph 64 / 61°F 94% 1014 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

WNW
WNW

 5 / 9 mph 59 / 59°F 96% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May		01:00

WNW
WNW

 6 / 10 mph 57 / 56°F 95% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 6 / 12 mph 54 / 53°F 95% 1015 mb
Low level cloud: 9%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 8 / 10 mph 62 / 60°F 83% 1018 mb
Low level cloud: 8%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 9 / 11 mph 71 / 68°F 51% 1018 mb
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
13:00

NNW
NNW

 10 / 11 mph 74 / 76°F 42% 1017 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 10 / 11 mph 74 / 75°F 40% 1016 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 4 / 6 mph 69 / 67°F 62% 1017 mb
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
22:00

N
N

 4 / 8 mph 61 / 61°F 63% 1018 mb
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
Fri 31
May		01:00

N
N

 7 / 12 mph 57 / 56°F 58% 1019 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 6 / 10 mph 53 / 51°F 61% 1020 mb
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
07:00

N
N

 9 / 11 mph 58 / 55°F 55% 1022 mb
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
10:00

NNW
NNW

 11 / 13 mph 69 / 67°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 10 / 11 mph 74 / 74°F 33% 1021 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
16:00

NNW
NNW

 10 / 11 mph 74 / 75°F 35% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 34%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 2 / 2 mph 69 / 67°F 56% 1021 mb
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
22:00

WNW
WNW

 4 / 9 mph 62 / 62°F 58% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun		01:00

NNW
NNW

 5 / 11 mph 57 / 57°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 4 / 9 mph 55 / 54°F 69% 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
07:00

NNW
NNW

 6 / 8 mph 63 / 61°F 58% 1024 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
10:00

N
N

 5 / 6 mph 74 / 75°F 38% 1023 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

NNE
NNE

 4 / 5 mph 80 / 77°F 30% 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
16:00

N
N

 2 / 2 mph 81 / 77°F 35% 1021 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

ESE
ESE

 2 / 4 mph 71 / 68°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 3 / 7 mph 62 / 62°F 60% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Jun		01:00

SSW
SSW

 5 / 11 mph 59 / 59°F 62% 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
04:00

SW
SW

 5 / 10 mph 57 / 57°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 41%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 6 / 9 mph 64 / 62°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 8 mph 75 / 76°F 53% 1020 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 98%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 9 / 10 mph 84 / 81°F 38% 1017 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 12%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 8 / 10 mph 87 / 83°F 36% 1015 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 8%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 5 / 8 mph 73 / 69°F 80% 1016 mb
Low level cloud: 2%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 4 / 7 mph 67 / 67°F 88% 1015 mb
Low level cloud: 15%
Mid level cloud: 92%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun		01:00

SSE
SSE

 3 / 6 mph 66 / 66°F 95% 1014 mb
Low level cloud: 23%
Mid level cloud: 49%
High level cloud: 19%
Most Significant Cloud Type: low
42%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSW
SSW

 4 / 7 mph 63 / 63°F 97% 1013 mb
Low level cloud: 20%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 4 / 6 mph 64 / 63°F 99% 1014 mb
Low level cloud: 82%
Mid level cloud: 44%
High level cloud: 10%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

W
W

 4 / 5 mph 76 / 78°F 76% 1013 mb
Low level cloud: 73%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 8 / 12 mph 80 / 80°F 74% 1012 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

NNW
NNW

 6 / 9 mph 81 / 80°F 72% 1011 mb
Low level cloud: 38%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: low
51%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

N
N

 3 / 4 mph 77 / 77°F 85% 1011 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 16%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 4 / 7 mph 68 / 68°F 94% 1012 mb
Low level cloud: 16%
Mid level cloud: 21%
High level cloud: 10%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 04
Jun		01:00

S
S

 3 / 5 mph 67 / 67°F 92% 1014 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
07:00

SW
SW

 7 / 15 mph 69 / 69°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
13:00

SW
SW

 9 / 19 mph 87 / 89°F 48% 1012 mb
Low level cloud: 15%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
37%
0.0 In
19:00

S
S

 6 / 11 mph 86 / 88°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Wed 05
Jun		01:00

S
S

 5 / 9 mph 73 / 77°F 80% 1011 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 9%
Most Significant Cloud Type: medium
30%
0.0 In
07:00

SW
SW

 2 / 4 mph 77 / 82°F 86% 1007 mb
Low level cloud: 26%
Mid level cloud: 22%
High level cloud: 58%
Most Significant Cloud Type: low
41%
0.0 In
13:00

WNW
WNW

 7 / 14 mph 92 / 98°F 47% 1008 mb
Low level cloud: 13%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
19:00

ESE
ESE

 7 / 13 mph 78 / 81°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
Thu 06
Jun		01:00

S
S

 6 / 12 mph 72 / 77°F 98% 1011 mb
Low level cloud: 66%
Mid level cloud: 43%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SE
SE

 4 / 9 mph 68 / 68°F 98% 1011 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 49%
Most Significant Cloud Type: low
97%
0.1 In
13:00

S
S

 9 / 18 mph 82 / 89°F 82% 1008 mb
Low level cloud: 18%
Mid level cloud: 31%
High level cloud: 59%
Most Significant Cloud Type: low
36%
0.1 In
19:00

WSW
WSW

 6 / 14 mph 78 / 82°F 81% 1002 mb
Low level cloud: 2%
Mid level cloud: 31%
High level cloud: 24%
Most Significant Cloud Type: medium
38%
0.2 In
Fri 07
Jun		01:00

S
S

 11 / 23 mph 70 / 70°F 97% 1001 mb
Low level cloud: 95%
Mid level cloud: 56%
High level cloud: 67%
Most Significant Cloud Type: low
100%
0.6 In
07:00

NW
NW

 5 / 10 mph 75 / 78°F 88% 1002 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
1.0 In
13:00

NW
NW

 8 / 17 mph 65 / 65°F 97% 998 mb
Low level cloud: 85%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.8 In
19:00

NNW
NNW

 4 / 9 mph 75 / 78°F 79% 999 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Sat 08
Jun		01:00

WNW
WNW

 5 / 11 mph 62 / 62°F 78% 999 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

WNW
WNW

 11 / 23 mph 61 / 61°F 75% 1002 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
13:00

SE
SE

 1 / 2 mph 78 / 79°F 44% 1000 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 3%
Most Significant Cloud Type: medium
47%
0.0 In
19:00

WNW
WNW

 6 / 13 mph 71 / 71°F 59% 1006 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
Sun 09
Jun		01:00

WSW
WSW

 4 / 8 mph 61 / 61°F 92% 1002 mb
Low level cloud: 8%
Mid level cloud: 64%
High level cloud: 33%
Most Significant Cloud Type: medium
88%
0.0 In
07:00

W
W

 7 / 16 mph 63 / 63°F 67% 1009 mb
Low level cloud: 46%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
13:00

WNW
WNW

 7 / 15 mph 77 / 79°F 50% 1005 mb
Low level cloud: 14%
Mid level cloud: 26%
High level cloud: 12%
Most Significant Cloud Type: low
24%
0.0 In
19:00

SW
SW

 4 / 8 mph 76 / 79°F 70% 1010 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 69%
Most Significant Cloud Type: medium
24%
0.0 In
Mon 10
Jun		01:00

NW
NW

 5 / 11 mph 67 / 67°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

W
W

 5 / 10 mph 70 / 70°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 17%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

WSW
WSW

 6 / 13 mph 77 / 78°F 44% 1012 mb
Low level cloud: 3%
Mid level cloud: 48%
High level cloud: 63%
Most Significant Cloud Type: medium
59%
0.0 In
19:00

SSE
SSE

 4 / 9 mph 81 / 85°F 62% 1010 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
0.0 In
Tue 11
Jun		01:00

W
W

 5 / 11 mph 65 / 65°F 77% 1013 mb
Low level cloud: 34%
Mid level cloud: 55%
High level cloud: 3%
Most Significant Cloud Type: low
53%
0.0 In
07:00

ESE
ESE

 2 / 4 mph 68 / 68°F 99% 1010 mb
Low level cloud: 81%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
13:00

NW
NW

 12 / 26 mph 83 / 83°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

N
N

 3 / 7 mph 73 / 78°F 95% 1007 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 5%
Most Significant Cloud Type: medium
43%
0.4 In
Wed 12
Jun		01:00

W
W

 5 / 10 mph 73 / 77°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 4%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NW
NW

 4 / 9 mph 70 / 70°F 89% 1009 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: medium
77%
0.1 In
13:00

WSW
WSW

 6 / 13 mph 92 / 94°F 38% 1011 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: medium
16%
0.0 In
19:00

NW
NW

 4 / 8 mph 70 / 70°F 82% 1010 mb
Low level cloud: 57%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
77%
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