Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Vostok 14 Day Long Range Forecast

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

Antarctica

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

Over the next 14 days the Vostok forecast suggests the average daytime maximum temperature will be around -55°C, with a high for the two weeks of -40°C expected on the evening of Thursday 25th. The mean minimum temperature will be -61°C, dipping to its lowest on the morning of Sunday 28th at -67°C. Expect the following 14 days ahead to remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 25
Apr		18:00

W
W

 13 / 26 mph -47 / -77°F 99% 1000 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 16 / 30 mph -40 / -72°F 94% 992 mb
Low level cloud: 72%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 26
Apr		00:00

W
W

 15 / 31 mph -49 / -82°F 95% 998 mb
Low level cloud: 58%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 14 / 29 mph -61 / -96°F 99% 1008 mb
Low level cloud: 78%
Mid level cloud: 71%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 13 / 28 mph -68 / -105°F 100% 1016 mb
Low level cloud: 96%
Mid level cloud: 87%
High level cloud: 60%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 14 / 29 mph -70 / -107°F 100% 1018 mb
Low level cloud: 94%
Mid level cloud: 83%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 14 / 28 mph -74 / -113°F 100% 1022 mb
Low level cloud: 95%
Mid level cloud: 86%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 13 / 28 mph -79 / -119°F 100% 1028 mb
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 13 / 27 mph -82 / -123°F 100% 1033 mb
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 13 / 27 mph -83 / -124°F 100% 1034 mb
Low level cloud: 100%
Mid level cloud: 77%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 27
Apr		00:00

SSW
SSW

 13 / 27 mph -86 / -126°F 99% 1033 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 39%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 12 / 26 mph -87 / -127°F 100% 1037 mb
Low level cloud: 100%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 12 / 24 mph -88 / -128°F 100% 1039 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 11 / 23 mph -85 / -124°F 100% 1039 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 11 / 22 mph -82 / -119°F 100% 1036 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 10 / 21 mph -81 / -117°F 100% 1040 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 9 / 19 mph -82 / -117°F 100% 1044 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 10 / 22 mph -85 / -121°F 100% 1044 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 28
Apr		00:00

SSW
SSW

 10 / 20 mph -87 / -123°F 100% 1047 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 11 / 22 mph -88 / -126°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 84%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 11 / 22 mph -88 / -127°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 11 / 24 mph -87 / -126°F 100% 1047 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 11 / 24 mph -85 / -124°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 51%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 12 / 26 mph -84 / -124°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 86%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 13 / 26 mph -85 / -125°F 100% 1045 mb
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 13 / 27 mph -86 / -127°F 100% 1044 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr		00:00

SW
SW

 13 / 27 mph -84 / -125°F 100% 1043 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 13 / 27 mph -85 / -126°F 100% 1041 mb
Low level cloud: 100%
Mid level cloud: 80%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 13 / 28 mph -85 / -127°F 100% 1040 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 28 mph -84 / -125°F 100% 1038 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 14 / 29 mph -82 / -124°F 100% 1038 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 14 / 30 mph -82 / -123°F 100% 1038 mb
Low level cloud: 96%
Mid level cloud: 82%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 14 / 30 mph -82 / -124°F 100% 1038 mb
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 14 / 29 mph -83 / -125°F 100% 1037 mb
Low level cloud: 99%
Mid level cloud: 75%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 30
Apr		00:00

WSW
WSW

 13 / 28 mph -82 / -123°F 100% 1040 mb
Low level cloud: 99%
Mid level cloud: 82%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 13 / 27 mph -84 / -124°F 100% 1042 mb
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 12 / 25 mph -85 / -124°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 11 / 24 mph -82 / -120°F 100% 1049 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 67%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 12 / 25 mph -79 / -117°F 100% 1050 mb
Low level cloud: 96%
Mid level cloud: 79%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 13 / 26 mph -78 / -116°F 100% 1052 mb
Low level cloud: 93%
Mid level cloud: 80%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 14 / 29 mph -79 / -119°F 100% 1050 mb
Low level cloud: 90%
Mid level cloud: 73%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 15 / 31 mph -81 / -123°F 100% 1047 mb
Low level cloud: 92%
Mid level cloud: 76%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May		00:00

W
W

 16 / 34 mph -78 / -120°F 99% 1043 mb
Low level cloud: 77%
Mid level cloud: 52%
High level cloud: 5%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 19 / 39 mph -74 / -118°F 96% 1037 mb
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 21 / 45 mph -70 / -115°F 91% 1032 mb
Low level cloud: 23%
Mid level cloud: 32%
High level cloud: 5%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 23 / 49 mph -66 / -111°F 85% 1028 mb
Low level cloud: 3%
Mid level cloud: 22%
High level cloud: 14%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 22 / 46 mph -64 / -108°F 87% 1027 mb
Low level cloud: 35%
Mid level cloud: 28%
High level cloud: 18%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 19 / 40 mph -66 / -108°F 92% 1031 mb
Low level cloud: 57%
Mid level cloud: 39%
High level cloud: 21%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 17 / 37 mph -69 / -110°F 98% 1036 mb
Low level cloud: 77%
Mid level cloud: 52%
High level cloud: 20%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 17 / 35 mph -71 / -112°F 99% 1039 mb
Low level cloud: 85%
Mid level cloud: 63%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 02
May		00:00

SSW
SSW

 24 / 34 mph -41 / -79°F 94% 1030 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

 21 / 44 mph -60 / -102°F 94% 1040 mb
Low level cloud: 80%
Mid level cloud: 75%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 18 / 38 mph -63 / -103°F 94% 1043 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 21%
Most Significant Cloud Type: low
95%
0.0 In
18:00

WNW
WNW

 13 / 27 mph -66 / -101°F 100% 1050 mb
Low level cloud: 97%
Mid level cloud: 88%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
Fri 03
May		00:00

WSW
WSW

 14 / 30 mph -60 / -96°F 100% 1035 mb
Low level cloud: 94%
Mid level cloud: 80%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

 13 / 28 mph -75 / -114°F 100% 1049 mb
Low level cloud: 100%
Mid level cloud: 86%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSE
SSE

 19 / 26 mph -30 / -60°F 96% 1007 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 9 / 19 mph -72 / -104°F 100% 1040 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sat 04
May		00:00

SW
SW

 15 / 31 mph -69 / -108°F 100% 1035 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 9 / 19 mph -60 / -89°F 100% 1029 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 15 / 32 mph -66 / -104°F 100% 1046 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 38%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

 8 / 16 mph -80 / -110°F 100% 1062 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.0 In
Sun 05
May		00:00

SW
SW

 15 / 31 mph -72 / -112°F 100% 1050 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

 9 / 18 mph -80 / -113°F 100% 1068 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 15 / 32 mph -71 / -111°F 100% 1051 mb
Low level cloud: 93%
Mid level cloud: 79%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 12 / 25 mph -70 / -106°F 100% 1057 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
Mon 06
May		00:00

SW
SW

 15 / 31 mph -71 / -110°F 100% 1051 mb
Low level cloud: 94%
Mid level cloud: 82%
High level cloud: 18%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

 10 / 21 mph -72 / -104°F 100% 1060 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 13 / 28 mph -76 / -115°F 100% 1055 mb
Low level cloud: 93%
Mid level cloud: 81%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

 19 / 27 mph -27 / -56°F 97% 1005 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Tue 07
May		00:00

SSW
SSW

 10 / 21 mph -83 / -120°F 100% 1063 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 14 / 24 mph -41 / -71°F 99% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 5 / 11 mph -93 / -120°F 100% 1081 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

 5 / 10 mph -63 / -85°F 100% 1042 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
Wed 08
May		00:00

SE
SE

 13 / 27 mph -64 / -99°F 99% 1050 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 5 / 10 mph -82 / -107°F 100% 1074 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 10 / 21 mph -55 / -84°F 99% 1038 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

 8 / 16 mph -72 / -101°F 100% 1071 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 09
May		00:00

WSW
WSW

 4 / 8 mph -71 / -90°F 100% 1050 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

 7 / 15 mph -62 / -89°F 100% 1061 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 11 / 23 mph -82 / -119°F 100% 1061 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 8 / 17 mph -69 / -99°F 100% 1068 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 10
May		00:00

SW
SW

 15 / 31 mph -81 / -122°F 100% 1057 mb
Low level cloud: 91%
Mid level cloud: 75%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 6 / 14 mph -66 / -91°F 100% 1065 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 30 / 44 mph -50 / -94°F 95% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 11 / 22 mph -47 / -75°F 99% 1045 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure