Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Grange-Over-Sands 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Grange-Over-Sands

Cumbria, United Kingdom

Long range weather outlook for Grange-Over-Sands includes 14 day forecast summary:

Taking a look at Grange-Over-Sands over the coming two weeks and the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the afternoon of Tuesday 25th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Sunday 16th at 9°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Thursday 20th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 15
Jun		21:00

W
W

 7 / 10 mph 52 / 49°F 83% 997 mb
Low level cloud: 7%
Mid level cloud: 91%
High level cloud: 76%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 16
Jun		00:00

WSW
WSW

 4 / 7 mph 49 / 48°F 84% 997 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 4 / 8 mph 48 / 46°F 86% 997 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 6 / 8 mph 53 / 50°F 84% 998 mb
Low level cloud: 78%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 11 / 13 mph 57 / 53°F 79% 999 mb
Low level cloud: 32%
Mid level cloud: 29%
High level cloud: 11%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 16 / 19 mph 58 / 53°F 75% 1000 mb
Low level cloud: 8%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 17 / 20 mph 58 / 53°F 78% 1000 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 15 / 20 mph 57 / 53°F 81% 1001 mb
Low level cloud: 71%
Mid level cloud: 44%
High level cloud: 71%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 13 / 19 mph 54 / 50°F 93% 1002 mb
Low level cloud: 85%
Mid level cloud: 98%
High level cloud: 30%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 17
Jun		00:00

WSW
WSW

 9 / 12 mph 54 / 51°F 94% 1003 mb
Low level cloud: 80%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

W
W

 7 / 11 mph 53 / 51°F 94% 1004 mb
Low level cloud: 86%
Mid level cloud: 75%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 6 / 11 mph 54 / 50°F 92% 1005 mb
Low level cloud: 50%
Mid level cloud: 22%
High level cloud: 13%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 10 / 15 mph 56 / 52°F 86% 1007 mb
Low level cloud: 43%
Mid level cloud: 23%
High level cloud: 15%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 13 / 16 mph 59 / 55°F 83% 1009 mb
Low level cloud: 23%
Mid level cloud: 21%
High level cloud: 5%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 13 / 15 mph 61 / 60°F 82% 1010 mb
Low level cloud: 51%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 13 / 14 mph 59 / 55°F 81% 1011 mb
Low level cloud: 22%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 10 / 11 mph 57 / 53°F 91% 1013 mb
Low level cloud: 37%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun		00:00

W
W

 6 / 7 mph 55 / 53°F 88% 1014 mb
Low level cloud: 49%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 3 / 4 mph 53 / 53°F 88% 1015 mb
Low level cloud: 85%
Mid level cloud: 9%
High level cloud: 14%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 2 / 3 mph 53 / 52°F 86% 1016 mb
Low level cloud: 86%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 2 / 3 mph 55 / 55°F 83% 1017 mb
Low level cloud: 87%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 5 / 6 mph 58 / 57°F 83% 1018 mb
Low level cloud: 80%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 7 / 9 mph 60 / 58°F 81% 1019 mb
Low level cloud: 68%
Mid level cloud: 7%
High level cloud: 50%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 6 / 6 mph 60 / 58°F 82% 1020 mb
Low level cloud: 23%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 3 / 3 mph 58 / 57°F 88% 1022 mb
Low level cloud: 21%
Mid level cloud: 5%
High level cloud: 22%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Jun		00:00

SSE
SSE

 3 / 5 mph 54 / 53°F 88% 1022 mb
Low level cloud: 35%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 5 / 8 mph 52 / 51°F 90% 1022 mb
Low level cloud: 21%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 5 / 6 mph 56 / 53°F 88% 1023 mb
Low level cloud: 29%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 7 / 9 mph 58 / 55°F 79% 1024 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 7 / 8 mph 60 / 57°F 75% 1023 mb
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
15:00

WSW
WSW

 6 / 7 mph 61 / 59°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 3 / 3 mph 61 / 59°F 69% 1021 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
21:00

SW
SW

 2 / 4 mph 56 / 56°F 77% 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
Thu 20
Jun		00:00

ENE
ENE

 4 / 8 mph 51 / 50°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 5 / 11 mph 49 / 47°F 63% 1016 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
06:00

ENE
ENE

 4 / 8 mph 55 / 53°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 5 / 6 mph 64 / 62°F 72% 1013 mb
Low level cloud: 2%
Mid level cloud: 15%
High level cloud: 30%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 11 / 13 mph 59 / 56°F 92% 1011 mb
Low level cloud: 49%
Mid level cloud: 95%
High level cloud: 8%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSE
SSE

 2 / 3 mph 55 / 55°F 95% 1010 mb
Low level cloud: 79%
Mid level cloud: 77%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ESE
ESE

 10 / 15 mph 55 / 52°F 83% 1008 mb
Low level cloud: 67%
Mid level cloud: 85%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 6 / 9 mph 54 / 52°F 77% 1007 mb
Low level cloud: 81%
Mid level cloud: 73%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Jun		00:00

E
E

 6 / 8 mph 55 / 53°F 75% 1006 mb
Low level cloud: 87%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 5 / 8 mph 53 / 52°F 81% 1005 mb
Low level cloud: 95%
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
06:00

SE
SE

 2 / 4 mph 53 / 53°F 80% 1005 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 5 mph 55 / 54°F 94% 1006 mb
Low level cloud: 97%
Mid level cloud: 66%
High level cloud: 100%
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 / 13 mph 59 / 56°F 87% 1007 mb
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 16%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 9 / 10 mph 62 / 60°F 84% 1007 mb
Low level cloud: 58%
Mid level cloud: 21%
High level cloud: 10%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 6 / 7 mph 62 / 59°F 82% 1007 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 1 / 1 mph 59 / 57°F 89% 1008 mb
Low level cloud: 3%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 22
Jun		00:00

SSE
SSE

 1 / 2 mph 61 / 61°F 85% 1021 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 20%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

E
E

 3 / 6 mph 59 / 59°F 86% 1019 mb
Low level cloud: 5%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

SSW
SSW

 8 / 16 mph 66 / 66°F 72% 1013 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: low
8%
0.0 In
18:00

SSW
SSW

 2 / 4 mph 71 / 71°F 75% 1015 mb
Low level cloud: 30%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
34%
0.0 In
Sun 23
Jun		00:00

SW
SW

 15 / 31 mph 56 / 53°F 93% 1013 mb
Low level cloud: 39%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
06:00

WNW
WNW

 16 / 34 mph 54 / 49°F 85% 1008 mb
Low level cloud: 44%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
12:00

WSW
WSW

 13 / 26 mph 59 / 56°F 79% 1017 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
75%
0.0 In
18:00

WSW
WSW

 6 / 12 mph 63 / 63°F 85% 1018 mb
Low level cloud: 26%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
Mon 24
Jun		00:00

SSE
SSE

 2 / 3 mph 61 / 61°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 76%
Most Significant Cloud Type: medium
15%
0.0 In
06:00

ESE
ESE

 3 / 6 mph 61 / 61°F 85% 1018 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
0.0 In
12:00

WSW
WSW

 5 / 9 mph 64 / 64°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
0.0 In
18:00

W
W

 5 / 11 mph 66 / 66°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
Tue 25
Jun		00:00

NNW
NNW

 2 / 4 mph 60 / 60°F 86% 1022 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
06:00

WSW
WSW

 6 / 14 mph 57 / 56°F 88% 1020 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 5 / 10 mph 69 / 69°F 72% 1024 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
18:00

WSW
WSW

 6 / 14 mph 63 / 63°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 91%
Most Significant Cloud Type: medium
9%
0.0 In
Wed 26
Jun		00:00

E
E

 5 / 10 mph 62 / 62°F 92% 1025 mb
Low level cloud: 4%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
0.0 In
06:00

E
E

 3 / 7 mph 60 / 60°F 84% 1026 mb
Low level cloud: 27%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
12:00

ENE
ENE

 11 / 21 mph 70 / 70°F 70% 1025 mb
Low level cloud: 48%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
51%
0.0 In
18:00

WNW
WNW

 2 / 5 mph 73 / 77°F 77% 1024 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Thu 27
Jun		00:00

ENE
ENE

 6 / 11 mph 59 / 59°F 90% 1025 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 17%
Most Significant Cloud Type: medium
24%
0.0 In
06:00

SE
SE

 3 / 7 mph 63 / 63°F 92% 1021 mb
Low level cloud: 59%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
12:00

ENE
ENE

 10 / 19 mph 65 / 65°F 60% 1023 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: medium
10%
0.0 In
18:00

W
W

 5 / 11 mph 68 / 68°F 88% 1018 mb
Low level cloud: 72%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Fri 28
Jun		00:00

NE
NE

 8 / 16 mph 52 / 49°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
06:00

WNW
WNW

 13 / 28 mph 57 / 54°F 94% 1015 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.8 In
12:00

E
E

 11 / 23 mph 70 / 70°F 72% 1020 mb
Low level cloud: 32%
Mid level cloud: 18%
High level cloud: 76%
Most Significant Cloud Type: low
47%
0.0 In
18:00

WNW
WNW

 11 / 23 mph 61 / 61°F 85% 1014 mb
Low level cloud: 15%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.1 In
Sat 29
Jun		00:00

NE
NE

 8 / 17 mph 56 / 54°F 91% 1021 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
06:00

NNE
NNE

 9 / 20 mph 58 / 56°F 88% 1017 mb
Low level cloud: 10%
Mid level cloud: 9%
High level cloud: 29%
Most Significant Cloud Type: low
16%
0.0 In
12:00

E
E

 12 / 24 mph 71 / 71°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
0.0 In
18:00

ENE
ENE

 7 / 15 mph 67 / 67°F 80% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Sun 30
Jun		00:00

NE
NE

 8 / 16 mph 58 / 57°F 91% 1022 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

NNE
NNE

 6 / 13 mph 59 / 58°F 79% 1021 mb
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 98%
Most Significant Cloud Type: medium
40%
0.0 In
12:00

ENE
ENE

 11 / 23 mph 72 / 76°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

NNE
NNE

 9 / 18 mph 66 / 67°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
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