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Uniondale 14 Day Long Range Forecast

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

New York, United States Of America

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

For Uniondale in the coming two weeks the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 17°C expected on the afternoon of Saturday 8th. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Sunday 16th at 0°C. The coming 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. It looks like Monday 10th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 06
Nov		01:00

WNW
WNW

 27 / 34 mph 50 / 42°F 58% 1006 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

WNW
WNW

 21 / 33 mph 48 / 40°F 61% 1011 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 18 / 23 mph 48 / 41°F 57% 1014 mb
Low level cloud: 27%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 19 / 22 mph 51 / 44°F 44% 1017 mb
Low level cloud: 10%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 20 / 23 mph 53 / 47°F 35% 1017 mb
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
16:00

NW
NW

 16 / 18 mph 54 / 49°F 33% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 12 / 14 mph 52 / 48°F 39% 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
22:00

NNW
NNW

 9 / 10 mph 51 / 48°F 42% 1022 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 29%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Nov		19:00

SSW
SSW

 21 / 31 mph 58 / 54°F 70% 1008 mb
Low level cloud: 13%
Mid level cloud: 7%
High level cloud: 38%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 17 / 26 mph 58 / 55°F 72% 1007 mb
Low level cloud: 63%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Nov		01:00

SW
SW

 15 / 21 mph 58 / 54°F 87% 1005 mb
Low level cloud: 93%
Mid level cloud: 92%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SW
SW

 13 / 19 mph 57 / 54°F 93% 1005 mb
Low level cloud: 92%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

W
W

 12 / 17 mph 57 / 55°F 89% 1006 mb
Low level cloud: 86%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 11 / 14 mph 61 / 60°F 64% 1008 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

WNW
WNW

 10 / 12 mph 63 / 63°F 51% 1009 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

NW
NW

 8 / 11 mph 63 / 63°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 12 / 13 mph 58 / 55°F 56% 1013 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 65%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 7 / 9 mph 56 / 55°F 56% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 09
Nov		01:00

E
E

 8 / 9 mph 54 / 52°F 59% 1014 mb
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
04:00

ESE
ESE

 9 / 13 mph 53 / 51°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 12 / 21 mph 53 / 49°F 78% 1014 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 13 / 20 mph 57 / 53°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 14 / 19 mph 60 / 59°F 77% 1010 mb
Low level cloud: 51%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 9 / 12 mph 60 / 60°F 95% 1008 mb
Low level cloud: 100%
Mid level cloud: 26%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 6 / 11 mph 59 / 58°F 98% 1009 mb
Low level cloud: 78%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 2 / 4 mph 56 / 58°F 97% 1008 mb
Low level cloud: 52%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 10
Nov		01:00

NW
NW

 6 / 9 mph 57 / 56°F 91% 1006 mb
Low level cloud: 49%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
04:00

NW
NW

 11 / 14 mph 55 / 51°F 86% 1005 mb
Low level cloud: 70%
Mid level cloud: 56%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
07:00

NW
NW

 13 / 16 mph 51 / 46°F 81% 1007 mb
Low level cloud: 60%
Mid level cloud: 78%
High level cloud: 98%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 14 / 17 mph 48 / 42°F 66% 1008 mb
Low level cloud: 44%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 14 / 16 mph 50 / 45°F 52% 1008 mb
Low level cloud: 59%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 16 / 18 mph 49 / 42°F 46% 1010 mb
Low level cloud: 46%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 15 / 17 mph 46 / 39°F 41% 1012 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
22:00

WNW
WNW

 14 / 17 mph 43 / 36°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 11
Nov		01:00

WNW
WNW

 15 / 18 mph 40 / 32°F 49% 1014 mb
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
04:00

WNW
WNW

 14 / 16 mph 39 / 30°F 54% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 15 / 17 mph 37 / 28°F 55% 1018 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
10:00

W
W

 15 / 18 mph 40 / 32°F 49% 1019 mb
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
13:00

W
W

 16 / 18 mph 45 / 38°F 41% 1017 mb
Low level cloud: 5%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 15 / 19 mph 47 / 40°F 36% 1017 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 2%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 15 / 17 mph 46 / 40°F 40% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 15 / 21 mph 45 / 38°F 38% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 33%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 12
Nov		01:00

SSW
SSW

 18 / 25 mph 46 / 39°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 35%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 21 / 28 mph 47 / 39°F 47% 1012 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 19 / 26 mph 46 / 38°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 21 / 24 mph 49 / 42°F 44% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 19 / 23 mph 54 / 49°F 41% 1007 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: medium
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 17 / 23 mph 56 / 51°F 46% 1006 mb
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
19:00

WSW
WSW

 17 / 25 mph 55 / 51°F 50% 1007 mb
Low level cloud: 1%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 15 / 20 mph 54 / 50°F 54% 1007 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 13
Nov		01:00

W
W

 18 / 30 mph 48 / 41°F 67% 1004 mb
Low level cloud: 49%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
07:00

W
W

 16 / 29 mph 45 / 38°F 70% 1009 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
13:00

W
W

 18 / 30 mph 50 / 44°F 52% 1011 mb
Low level cloud: 62%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
19:00

WNW
WNW

 14 / 23 mph 55 / 51°F 52% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
0.0 In
Fri 14
Nov		01:00

NW
NW

 13 / 22 mph 45 / 39°F 64% 1012 mb
Low level cloud: 16%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
07:00

WNW
WNW

 17 / 31 mph 41 / 33°F 62% 1010 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
13:00

NW
NW

 19 / 28 mph 44 / 36°F 39% 1010 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

NW
NW

 12 / 15 mph 45 / 39°F 48% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
46%
0.0 In
Sat 15
Nov		01:00

WNW
WNW

 11 / 15 mph 37 / 30°F 49% 1014 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: medium
43%
0.0 In
07:00

SW
SW

 17 / 24 mph 47 / 40°F 65% 1002 mb
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 40%
Most Significant Cloud Type: medium
84%
0.0 In
13:00

E
E

 7 / 10 mph 41 / 36°F 97% 1002 mb
Low level cloud: 98%
Mid level cloud: 57%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.3 In
19:00

WNW
WNW

 12 / 15 mph 53 / 49°F 65% 1001 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
0.0 In
Sun 16
Nov		01:00

N
N

 12 / 17 mph 35 / 27°F 78% 1006 mb
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
37%
0.2 In
07:00

ESE
ESE

 14 / 24 mph 47 / 41°F 70% 998 mb
Low level cloud: 100%
Mid level cloud: 84%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 6 / 9 mph 44 / 40°F 49% 1008 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SW
SW

 9 / 12 mph 60 / 60°F 86% 990 mb
Low level cloud: 44%
Mid level cloud: 83%
High level cloud: 91%
Most Significant Cloud Type: low
84%
0.0 In
Mon 17
Nov		01:00

NNW
NNW

 3 / 4 mph 38 / 36°F 53% 1006 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WSW
WSW

 18 / 28 mph 44 / 36°F 68% 991 mb
Low level cloud: 12%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
24%
0.4 In
13:00

NNW
NNW

 11 / 17 mph 40 / 33°F 62% 1005 mb
Low level cloud: 75%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.1 In
19:00

WNW
WNW

 18 / 26 mph 48 / 42°F 53% 1001 mb
Low level cloud: 16%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
Tue 18
Nov		01:00

NW
NW

 9 / 13 mph 39 / 32°F 62% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

WNW
WNW

 19 / 28 mph 37 / 27°F 58% 1013 mb
Low level cloud: 16%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
13:00

NW
NW

 14 / 21 mph 39 / 30°F 48% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 81%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

NW
NW

 16 / 23 mph 42 / 34°F 47% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
Wed 19
Nov		01:00

NNW
NNW

 7 / 11 mph 40 / 34°F 56% 1022 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: medium
15%
0.0 In
07:00

WNW
WNW

 5 / 7 mph 42 / 39°F 56% 1026 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
13:00

NNW
NNW

 10 / 15 mph 41 / 35°F 39% 1023 mb
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

 5 / 7 mph 50 / 48°F 45% 1025 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 20
Nov		01:00

NNW
NNW

 9 / 13 mph 39 / 33°F 54% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

W
W

 3 / 5 mph 50 / 49°F 65% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

WNW
WNW

 6 / 8 mph 47 / 45°F 36% 1024 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

SSW
SSW

 2 / 3 mph 59 / 61°F 56% 1024 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
Fri 21
Nov		01:00

NNW
NNW

 4 / 6 mph 47 / 46°F 50% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

SW
SW

 3 / 5 mph 55 / 55°F 67% 1022 mb
Low level cloud: 1%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
0.0 In
13:00

WSW
WSW

 6 / 8 mph 53 / 51°F 41% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

S
S

 10 / 14 mph 59 / 57°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
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