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Cefn Canol 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Cefn Canol

Powys, United Kingdom

Long range weather outlook for Cefn Canol includes 14 day forecast summary:

Taking a look at Cefn Canol over the coming two weeks and the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 19°C expected on the afternoon of Monday 3rd. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Saturday 25th at 6°C. The coming 14 days will have most days seeing a little rain. Current predictions suggest Sunday 26th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
15:00

SE
SE

9 / 12 mph 62 / 62°F 78% 1014 mb
Low level cloud: 75%
Mid level cloud: 44%
High level cloud: 73%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

7 / 9 mph 63 / 60°F 83% 1013 mb
Low level cloud: 3%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

4 / 10 mph 53 / 50°F 88% 1012 mb
Low level cloud: 19%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

SSE
SSE

5 / 8 mph 50 / 48°F 94% 1011 mb
Low level cloud: 73%
Mid level cloud: 98%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

7 / 10 mph 50 / 47°F 99% 1009 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SE
SE

7 / 9 mph 52 / 49°F 98% 1008 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

9 / 10 mph 59 / 56°F 88% 1007 mb
Low level cloud: 54%
Mid level cloud: 15%
High level cloud: 33%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

14 / 19 mph 65 / 63°F 74% 1007 mb
Low level cloud: 62%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
73%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

13 / 17 mph 62 / 62°F 74% 1008 mb
Low level cloud: 9%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

10 / 12 mph 59 / 56°F 79% 1009 mb
Low level cloud: 8%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 15 mph 48 / 44°F 94% 1010 mb
Low level cloud: 28%
Mid level cloud: 22%
High level cloud: 21%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

SW
SW

9 / 15 mph 49 / 45°F 93% 1010 mb
Low level cloud: 68%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

8 / 13 mph 49 / 45°F 92% 1011 mb
Low level cloud: 84%
Mid level cloud: 81%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

8 / 10 mph 52 / 47°F 90% 1012 mb
Low level cloud: 14%
Mid level cloud: 32%
High level cloud: 42%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

11 / 13 mph 58 / 54°F 65% 1013 mb
Low level cloud: 24%
Mid level cloud: 45%
High level cloud: 35%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

10 / 12 mph 60 / 59°F 63% 1013 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 22%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

12 / 14 mph 62 / 60°F 64% 1012 mb
Low level cloud: 29%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

10 / 11 mph 58 / 55°F 74% 1013 mb
Low level cloud: 12%
Mid level cloud: 20%
High level cloud: 14%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

6 / 14 mph 47 / 43°F 92% 1014 mb
Low level cloud: 7%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
00:00

SSW
SSW

6 / 14 mph 44 / 40°F 96% 1014 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 52%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

5 / 11 mph 43 / 39°F 96% 1013 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

5 / 8 mph 49 / 47°F 98% 1011 mb
Low level cloud: 91%
Mid level cloud: 57%
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

S
S

7 / 8 mph 55 / 53°F 97% 1010 mb
Low level cloud: 81%
Mid level cloud: 56%
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

SSW
SSW

9 / 11 mph 58 / 56°F 97% 1009 mb
Low level cloud: 86%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

13 / 15 mph 61 / 61°F 92% 1008 mb
Low level cloud: 96%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

10 / 15 mph 58 / 55°F 95% 1007 mb
Low level cloud: 94%
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
21:00

SW
SW

14 / 26 mph 53 / 48°F 91% 1007 mb
Low level cloud: 49%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May
00:00

SW
SW

13 / 22 mph 52 / 47°F 89% 1006 mb
Low level cloud: 86%
Mid level cloud: 88%
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

WSW
WSW

14 / 21 mph 52 / 48°F 92% 1005 mb
Low level cloud: 96%
Mid level cloud: 61%
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

W
W

16 / 23 mph 53 / 47°F 90% 1006 mb
Low level cloud: 83%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

15 / 18 mph 54 / 50°F 91% 1007 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

17 / 21 mph 60 / 60°F 83% 1007 mb
Low level cloud: 89%
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
15:00

W
W

17 / 20 mph 64 / 63°F 74% 1007 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

14 / 17 mph 61 / 59°F 85% 1008 mb
Low level cloud: 9%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

8 / 17 mph 52 / 47°F 91% 1009 mb
Low level cloud: 8%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
00:00

WNW
WNW

9 / 19 mph 50 / 46°F 92% 1010 mb
Low level cloud: 93%
Mid level cloud: 29%
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

WNW
WNW

12 / 16 mph 54 / 50°F 86% 1011 mb
Low level cloud: 81%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

13 / 16 mph 54 / 49°F 81% 1012 mb
Low level cloud: 53%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

17 / 20 mph 59 / 55°F 73% 1012 mb
Low level cloud: 33%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

17 / 20 mph 62 / 62°F 68% 1013 mb
Low level cloud: 75%
Mid level cloud: 28%
High level cloud: 22%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

18 / 21 mph 63 / 62°F 69% 1013 mb
Low level cloud: 66%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

17 / 20 mph 58 / 53°F 83% 1015 mb
Low level cloud: 43%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

19 / 21 mph 53 / 48°F 80% 1017 mb
Low level cloud: 97%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
00:00

NW
NW

17 / 20 mph 51 / 46°F 84% 1017 mb
Low level cloud: 95%
Mid level cloud: 26%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

16 / 19 mph 51 / 46°F 85% 1018 mb
Low level cloud: 90%
Mid level cloud: 33%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

15 / 18 mph 52 / 47°F 87% 1019 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

14 / 16 mph 54 / 49°F 86% 1020 mb
Low level cloud: 92%
Mid level cloud: 69%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

15 / 18 mph 58 / 55°F 78% 1021 mb
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

15 / 18 mph 61 / 59°F 73% 1021 mb
Low level cloud: 59%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

13 / 15 mph 58 / 54°F 79% 1022 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

11 / 15 mph 54 / 49°F 79% 1023 mb
Low level cloud: 33%
Mid level cloud: 67%
High level cloud: 2%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun
00:00

WNW
WNW

14 / 30 mph 46 / 40°F 78% 1011 mb
Low level cloud: 36%
Mid level cloud: 7%
High level cloud: 36%
Most Significant Cloud Type: low
43%
0.0 In
06:00

WNW
WNW

4 / 9 mph 53 / 52°F 87% 1018 mb
Low level cloud: 38%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
12:00

NW
NW

8 / 16 mph 61 / 61°F 70% 1023 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

4 / 9 mph 62 / 62°F 78% 1023 mb
Low level cloud: 59%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
77%
0.0 In
Sun 02
Jun
00:00

WSW
WSW

5 / 10 mph 52 / 51°F 86% 1024 mb
Low level cloud: 37%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
54%
0.0 In
06:00

NW
NW

9 / 19 mph 57 / 55°F 88% 1024 mb
Low level cloud: 94%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: low
97%
0.0 In
12:00

N
N

13 / 28 mph 65 / 65°F 65% 1025 mb
Low level cloud: 55%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
70%
0.0 In
18:00

NNW
NNW

12 / 25 mph 61 / 62°F 80% 1024 mb
Low level cloud: 57%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
62%
0.0 In
Mon 03
Jun
00:00

NNW
NNW

4 / 8 mph 57 / 57°F 83% 1025 mb
Low level cloud: 97%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

6 / 13 mph 55 / 54°F 89% 1023 mb
Low level cloud: 86%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: low
88%
0.0 In
12:00

N
N

8 / 16 mph 63 / 63°F 85% 1022 mb
Low level cloud: 93%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
95%
0.0 In
18:00

NNW
NNW

9 / 19 mph 62 / 62°F 84% 1022 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
47%
0.0 In
Tue 04
Jun
00:00

WNW
WNW

2 / 4 mph 57 / 59°F 86% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: medium
45%
0.0 In
06:00

NNE
NNE

8 / 17 mph 54 / 52°F 93% 1023 mb
Low level cloud: 68%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
12:00

NNW
NNW

12 / 25 mph 53 / 49°F 84% 1015 mb
Low level cloud: 78%
Mid level cloud: 32%
High level cloud: 63%
Most Significant Cloud Type: low
96%
0.0 In
18:00

NE
NE

7 / 15 mph 62 / 62°F 83% 1024 mb
Low level cloud: 64%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
Wed 05
Jun
00:00

W
W

5 / 10 mph 42 / 39°F 93% 1009 mb
Low level cloud: 2%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
0.0 In
06:00

NNE
NNE

4 / 7 mph 54 / 54°F 94% 1026 mb
Low level cloud: 64%
Mid level cloud: 12%
High level cloud: 4%
Most Significant Cloud Type: low
68%
0.0 In
12:00

N
N

11 / 24 mph 56 / 53°F 73% 1005 mb
Low level cloud: 96%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

6 / 13 mph 67 / 67°F 80% 1023 mb
Low level cloud: 48%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
49%
0.0 In
Thu 06
Jun
00:00

WNW
WNW

7 / 14 mph 50 / 47°F 96% 1003 mb
Low level cloud: 99%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
06:00

N
N

5 / 10 mph 55 / 55°F 91% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 98%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

ESE
ESE

7 / 14 mph 60 / 60°F 74% 1006 mb
Low level cloud: 30%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NE
NE

11 / 22 mph 64 / 64°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Fri 07
Jun
00:00

NW
NW

2 / 4 mph 52 / 53°F 92% 1008 mb
Low level cloud: 11%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.1 In
06:00

N
N

6 / 12 mph 52 / 50°F 91% 1017 mb
Low level cloud: 37%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
40%
0.0 In
12:00

SE
SE

5 / 10 mph 67 / 67°F 64% 1007 mb
Low level cloud: 36%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
18:00

NE
NE

10 / 21 mph 65 / 65°F 87% 1013 mb
Low level cloud: 50%
Mid level cloud: 32%
High level cloud: 4%
Most Significant Cloud Type: low
61%
0.0 In
Sat 08
Jun
00:00

W
W

3 / 6 mph 51 / 51°F 94% 1007 mb
Low level cloud: 17%
Mid level cloud: 30%
High level cloud: 97%
Most Significant Cloud Type: low
38%
0.3 In
06:00

N
N

6 / 12 mph 57 / 56°F 93% 1013 mb
Low level cloud: 41%
Mid level cloud: 27%
High level cloud: 14%
Most Significant Cloud Type: low
51%
0.0 In
12:00

SSW
SSW

5 / 11 mph 56 / 56°F 91% 1008 mb
Low level cloud: 47%
Mid level cloud: 49%
High level cloud: 12%
Most Significant Cloud Type: low
66%
0.0 In
18:00

NNE
NNE

6 / 12 mph 61 / 61°F 97% 1011 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sun 09
Jun
00:00

SSW
SSW

6 / 12 mph 47 / 45°F 96% 1010 mb
Low level cloud: 19%
Mid level cloud: 35%
High level cloud: 13%
Most Significant Cloud Type: low
32%
0.1 In
06:00

N
N

4 / 8 mph 59 / 59°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.4 In
12:00

S
S

9 / 19 mph 61 / 61°F 73% 1010 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
90%
0.0 In
18:00

NNE
NNE

2 / 5 mph 65 / 65°F 93% 1009 mb
Low level cloud: 92%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: low
98%
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