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Killywool 14 Day Long Range Forecast

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

County Londonderry, United Kingdom

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

For Killywool in the coming two weeks the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 14°C expected on the afternoon of Wednesday 1st. The average minimum temperature will be 3°C, dipping to its lowest on the morning of Thursday 9th at -1°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 7th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the morning of Tuesday 7th, coming from a southerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 01
Apr
03:00

SSW
SSW

6 / 11 mph 48 / 45°F 81% 1024 mb
Low level cloud: 34%
Mid level cloud: 52%
High level cloud: 5%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

8 / 13 mph 49 / 45°F 83% 1022 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

11 / 12 mph 54 / 51°F 80% 1020 mb
Low level cloud: 62%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

15 / 17 mph 57 / 53°F 79% 1018 mb
Low level cloud: 84%
Mid level cloud: 50%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

11 / 14 mph 50 / 45°F 94% 1017 mb
Low level cloud: 99%
Mid level cloud: 78%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNW
NNW

15 / 19 mph 42 / 35°F 88% 1020 mb
Low level cloud: 99%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

13 / 18 mph 40 / 33°F 85% 1022 mb
Low level cloud: 80%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
Apr
00:00

NW
NW

12 / 17 mph 40 / 32°F 80% 1022 mb
Low level cloud: 99%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 11 mph 37 / 32°F 89% 1022 mb
Low level cloud: 48%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

3 / 6 mph 37 / 35°F 83% 1021 mb
Low level cloud: 55%
Mid level cloud: 22%
High level cloud: 25%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

4 / 4 mph 44 / 42°F 69% 1021 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 9%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

9 / 10 mph 48 / 44°F 56% 1018 mb
Low level cloud: 4%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

11 / 13 mph 48 / 43°F 65% 1015 mb
Low level cloud: 75%
Mid level cloud: 96%
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

12 / 14 mph 44 / 38°F 87% 1012 mb
Low level cloud: 98%
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
21:00

S
S

13 / 17 mph 43 / 37°F 94% 1008 mb
Low level cloud: 97%
Mid level cloud: 73%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
Apr
00:00

S
S

14 / 20 mph 45 / 38°F 94% 1004 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

10 / 14 mph 47 / 43°F 96% 1001 mb
Low level cloud: 99%
Mid level cloud: 75%
High level cloud: 38%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

10 / 13 mph 41 / 35°F 97% 1004 mb
Low level cloud: 99%
Mid level cloud: 47%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

W
W

13 / 15 mph 44 / 37°F 88% 1006 mb
Low level cloud: 92%
Mid level cloud: 47%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

11 / 13 mph 46 / 41°F 76% 1007 mb
Low level cloud: 95%
Mid level cloud: 46%
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

WSW
WSW

9 / 11 mph 47 / 43°F 73% 1008 mb
Low level cloud: 60%
Mid level cloud: 100%
High level cloud: 20%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

3 / 4 mph 46 / 45°F 79% 1007 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 15%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

3 / 4 mph 42 / 41°F 87% 1006 mb
Low level cloud: 92%
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
Sat 04
Apr
00:00

E
E

4 / 5 mph 42 / 40°F 95% 1003 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NE
NE

5 / 6 mph 41 / 38°F 99% 997 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

SSW
SSW

14 / 23 mph 47 / 41°F 95% 992 mb
Low level cloud: 98%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSW
SSW

21 / 32 mph 49 / 42°F 89% 990 mb
Low level cloud: 88%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSW
SSW

19 / 27 mph 49 / 42°F 88% 990 mb
Low level cloud: 62%
Mid level cloud: 99%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

W
W

11 / 13 mph 46 / 40°F 93% 994 mb
Low level cloud: 93%
Mid level cloud: 74%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

2 / 2 mph 42 / 42°F 91% 995 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

4 / 5 mph 40 / 37°F 94% 996 mb
Low level cloud: 96%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
Apr
00:00

W
W

14 / 20 mph 37 / 28°F 92% 1001 mb
Low level cloud: 54%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SW
SW

10 / 19 mph 33 / 25°F 89% 1005 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

8 / 15 mph 32 / 25°F 91% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

10 / 12 mph 41 / 34°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

17 / 19 mph 46 / 39°F 62% 1011 mb
Low level cloud: 51%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

10 / 13 mph 46 / 40°F 68% 1012 mb
Low level cloud: 50%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

7 / 9 mph 42 / 38°F 78% 1012 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 13 mph 34 / 29°F 90% 1011 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 98%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
Apr
00:00

SSE
SSE

11 / 18 mph 38 / 31°F 90% 1008 mb
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

20 / 28 mph 41 / 32°F 82% 1003 mb
Low level cloud: 70%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

24 / 31 mph 43 / 33°F 90% 996 mb
Low level cloud: 97%
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
09:00

S
S

16 / 19 mph 45 / 38°F 95% 992 mb
Low level cloud: 100%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

S
S

11 / 13 mph 41 / 35°F 89% 990 mb
Low level cloud: 25%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

S
S

19 / 22 mph 48 / 41°F 69% 988 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

21 / 26 mph 44 / 35°F 70% 986 mb
Low level cloud: 79%
Mid level cloud: 16%
High level cloud: 7%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

24 / 29 mph 40 / 30°F 86% 985 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
Apr
00:00

SSW
SSW

27 / 32 mph 41 / 31°F 81% 983 mb
Low level cloud: 87%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

24 / 33 mph 40 / 29°F 91% 983 mb
Low level cloud: 95%
Mid level cloud: 91%
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

25 / 38 mph 39 / 28°F 94% 983 mb
Low level cloud: 93%
Mid level cloud: 54%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

20 / 23 mph 41 / 32°F 96% 985 mb
Low level cloud: 97%
Mid level cloud: 48%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

SW
SW

21 / 24 mph 44 / 36°F 91% 987 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

20 / 23 mph 46 / 38°F 93% 988 mb
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

21 / 25 mph 44 / 36°F 92% 988 mb
Low level cloud: 96%
Mid level cloud: 51%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

19 / 31 mph 42 / 33°F 91% 989 mb
Low level cloud: 84%
Mid level cloud: 99%
High level cloud: 52%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 08
Apr
00:00

WSW
WSW

10 / 21 mph 39 / 32°F 91% 992 mb
Low level cloud: 27%
Mid level cloud: 33%
High level cloud: 19%
Most Significant Cloud Type: low
40%
0.0 In
06:00

SSW
SSW

12 / 25 mph 41 / 35°F 90% 994 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 22%
Most Significant Cloud Type: low
98%
0.3 In
12:00

W
W

15 / 32 mph 49 / 43°F 75% 998 mb
Low level cloud: 83%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

14 / 29 mph 41 / 34°F 96% 981 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Thu 09
Apr
00:00

W
W

6 / 13 mph 33 / 28°F 92% 1009 mb
Low level cloud: 13%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.1 In
06:00

NNW
NNW

20 / 42 mph 40 / 31°F 95% 983 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.8 In
12:00

W
W

12 / 25 mph 48 / 43°F 63% 1014 mb
Low level cloud: 58%
Mid level cloud: 74%
High level cloud: 48%
Most Significant Cloud Type: low
89%
0.0 In
18:00

NW
NW

21 / 45 mph 47 / 40°F 74% 994 mb
Low level cloud: 12%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.1 In
Fri 10
Apr
00:00

S
S

17 / 36 mph 41 / 32°F 94% 1005 mb
Low level cloud: 98%
Mid level cloud: 94%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NW
NW

17 / 35 mph 42 / 34°F 80% 1010 mb
Low level cloud: 60%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
12:00

WNW
WNW

13 / 26 mph 47 / 42°F 69% 1010 mb
Low level cloud: 98%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

10 / 21 mph 49 / 44°F 71% 1019 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 20%
Most Significant Cloud Type: low
12%
0.1 In
Sat 11
Apr
00:00

SW
SW

9 / 18 mph 41 / 35°F 92% 1014 mb
Low level cloud: 67%
Mid level cloud: 44%
High level cloud: 28%
Most Significant Cloud Type: low
85%
0.0 In
06:00

S
S

6 / 13 mph 42 / 38°F 95% 1020 mb
Low level cloud: 93%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

16 / 33 mph 48 / 42°F 51% 1026 mb
Low level cloud: 21%
Mid level cloud: 99%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

W
W

12 / 25 mph 48 / 43°F 75% 1026 mb
Low level cloud: 28%
Mid level cloud: 12%
High level cloud: 98%
Most Significant Cloud Type: low
44%
0.0 In
Sun 12
Apr
00:00

SSW
SSW

4 / 9 mph 33 / 29°F 81% 1034 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

WSW
WSW

11 / 22 mph 44 / 38°F 94% 1027 mb
Low level cloud: 99%
Mid level cloud: 47%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSE
SSE

11 / 23 mph 53 / 49°F 65% 1033 mb
Low level cloud: 30%
Mid level cloud: 30%
High level cloud: 98%
Most Significant Cloud Type: low
52%
0.0 In
18:00

W
W

8 / 17 mph 49 / 46°F 65% 1032 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.1 In
Mon 13
Apr
00:00

SE
SE

11 / 24 mph 44 / 38°F 82% 1029 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 6%
Most Significant Cloud Type: medium
21%
0.0 In
06:00

SSW
SSW

5 / 11 mph 35 / 30°F 84% 1030 mb
Low level cloud: 28%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SE
SE

19 / 40 mph 52 / 47°F 71% 1025 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
29%
0.0 In
18:00

SSW
SSW

11 / 24 mph 46 / 40°F 92% 1022 mb
Low level cloud: 86%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Tue 14
Apr
00:00

ESE
ESE

19 / 41 mph 46 / 38°F 73% 1023 mb
Low level cloud: 1%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

WNW
WNW

7 / 15 mph 43 / 38°F 97% 1022 mb
Low level cloud: 82%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
12:00

ESE
ESE

22 / 46 mph 51 / 44°F 72% 1019 mb
Low level cloud: 3%
Mid level cloud: 89%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NW
NW

7 / 15 mph 48 / 45°F 72% 1026 mb
Low level cloud: 13%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
Wed 15
Apr
00:00

SE
SE

20 / 42 mph 46 / 38°F 89% 1017 mb
Low level cloud: 87%
Mid level cloud: 73%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

3 / 6 mph 37 / 35°F 97% 1030 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 74%
Most Significant Cloud Type: low
50%
0.0 In
12:00

SE
SE

16 / 33 mph 53 / 49°F 81% 1020 mb
Low level cloud: 89%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.2 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