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Ballykelly 14 Day Long Range Forecast

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

County Londonderry, United Kingdom

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

The forecast for Ballykelly in the coming two weeks is predicting the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 13°C expected on the afternoon of Friday 31st. The mean minimum temperature will be 7°C, dipping to its lowest on the morning of Tuesday 4th at 3°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Thursday 30th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate. The strongest wind will be felt on the morning of Saturday 1st, coming from a south easterly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
Oct		18:00

NNW
NNW

 20 / 26 mph 48 / 41°F 76% 1011 mb
Low level cloud: 94%
Mid level cloud: 100%
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

NW
NW

 17 / 21 mph 46 / 40°F 76% 1013 mb
Low level cloud: 46%
Mid level cloud: 61%
High level cloud: 4%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
Oct		00:00

NW
NW

 15 / 23 mph 45 / 38°F 77% 1013 mb
Low level cloud: 64%
Mid level cloud: 92%
High level cloud: 15%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 14 / 22 mph 45 / 39°F 76% 1013 mb
Low level cloud: 87%
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
06:00

WNW
WNW

 12 / 19 mph 45 / 39°F 74% 1012 mb
Low level cloud: 34%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 7 / 10 mph 44 / 40°F 92% 1009 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 88%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 18 / 25 mph 52 / 47°F 95% 1004 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 28%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

WNW
WNW

 21 / 28 mph 53 / 47°F 87% 1003 mb
Low level cloud: 49%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 18 / 28 mph 50 / 43°F 87% 1003 mb
Low level cloud: 69%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 22 / 32 mph 49 / 42°F 79% 1003 mb
Low level cloud: 97%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
Oct		00:00

WNW
WNW

 25 / 44 mph 46 / 37°F 79% 1002 mb
Low level cloud: 90%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 25 / 50 mph 44 / 35°F 83% 1001 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 19 / 39 mph 43 / 34°F 79% 1003 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 13 / 23 mph 46 / 40°F 75% 1007 mb
Low level cloud: 72%
Mid level cloud: 64%
High level cloud: 33%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 11 / 15 mph 50 / 45°F 64% 1009 mb
Low level cloud: 20%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 9 / 10 mph 52 / 48°F 65% 1009 mb
Low level cloud: 9%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 5 / 6 mph 51 / 48°F 78% 1008 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 9 / 10 mph 47 / 43°F 92% 1003 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 67%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 28
Oct		00:00

W
W

 19 / 29 mph 50 / 44°F 86% 1001 mb
Low level cloud: 69%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 19 / 28 mph 49 / 43°F 87% 1000 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 21 / 30 mph 49 / 42°F 85% 999 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 22 / 29 mph 50 / 43°F 82% 999 mb
Low level cloud: 88%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 23 / 26 mph 53 / 47°F 76% 1000 mb
Low level cloud: 44%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 21 / 25 mph 51 / 45°F 74% 1000 mb
Low level cloud: 41%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 14 / 21 mph 48 / 42°F 74% 1001 mb
Low level cloud: 50%
Mid level cloud: 25%
High level cloud: 20%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 13 / 20 mph 48 / 42°F 81% 1000 mb
Low level cloud: 64%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
Oct		00:00

SW
SW

 11 / 18 mph 46 / 40°F 90% 999 mb
Low level cloud: 94%
Mid level cloud: 52%
High level cloud: 100%
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 / 20 mph 44 / 38°F 92% 996 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
06:00

WSW
WSW

 11 / 23 mph 43 / 37°F 83% 996 mb
Low level cloud: 14%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

SW
SW

 9 / 13 mph 46 / 42°F 78% 996 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 98%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 15 / 19 mph 50 / 44°F 74% 996 mb
Low level cloud: 55%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 12 / 13 mph 51 / 47°F 75% 996 mb
Low level cloud: 18%
Mid level cloud: 16%
High level cloud: 35%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 7 / 8 mph 50 / 47°F 84% 997 mb
Low level cloud: 9%
Mid level cloud: 94%
High level cloud: 82%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 6 / 8 mph 47 / 45°F 87% 998 mb
Low level cloud: 47%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
Oct		00:00

S
S

 4 / 8 mph 44 / 42°F 86% 997 mb
Low level cloud: 3%
Mid level cloud: 65%
High level cloud: 97%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 6 / 9 mph 45 / 42°F 90% 996 mb
Low level cloud: 86%
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
06:00

ESE
ESE

 8 / 10 mph 46 / 42°F 95% 994 mb
Low level cloud: 100%
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
09:00

ESE
ESE

 12 / 16 mph 51 / 47°F 93% 992 mb
Low level cloud: 71%
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

SE
SE

 23 / 29 mph 53 / 47°F 91% 988 mb
Low level cloud: 91%
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
15:00

SE
SE

 22 / 30 mph 54 / 48°F 95% 982 mb
Low level cloud: 98%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
18:00

SSE
SSE

 23 / 35 mph 53 / 47°F 84% 980 mb
Low level cloud: 70%
Mid level cloud: 24%
High level cloud: 75%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 23 / 30 mph 52 / 46°F 86% 979 mb
Low level cloud: 88%
Mid level cloud: 29%
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 31
Oct		00:00

S
S

 19 / 32 mph 51 / 45°F 84% 980 mb
Low level cloud: 95%
Mid level cloud: 57%
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

S
S

 16 / 28 mph 50 / 44°F 86% 982 mb
Low level cloud: 98%
Mid level cloud: 31%
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

SW
SW

 16 / 28 mph 49 / 43°F 83% 986 mb
Low level cloud: 79%
Mid level cloud: 27%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 16 / 18 mph 52 / 46°F 76% 990 mb
Low level cloud: 61%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 13 / 15 mph 54 / 50°F 74% 991 mb
Low level cloud: 20%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 11 / 13 mph 55 / 52°F 77% 991 mb
Low level cloud: 11%
Mid level cloud: 11%
High level cloud: 20%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 18 / 21 mph 54 / 49°F 82% 989 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 90%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 27 / 39 mph 52 / 45°F 84% 983 mb
Low level cloud: 95%
Mid level cloud: 19%
High level cloud: 100%
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
Sat 01
Nov		00:00

W
W

 4 / 9 mph 44 / 42°F 84% 1007 mb
Low level cloud: 59%
Mid level cloud: 31%
High level cloud: 5%
Most Significant Cloud Type: low
70%
0.0 In
06:00

SE
SE

 7 / 14 mph 44 / 41°F 94% 996 mb
Low level cloud: 19%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

S
S

 11 / 24 mph 57 / 54°F 92% 985 mb
Low level cloud: 86%
Mid level cloud: 85%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 25 / 53 mph 57 / 52°F 88% 992 mb
Low level cloud: 55%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
73%
0.0 In
Sun 02
Nov		00:00

ENE
ENE

 14 / 29 mph 47 / 41°F 82% 1000 mb
Low level cloud: 98%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

 5 / 11 mph 46 / 43°F 93% 994 mb
Low level cloud: 59%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
12:00

WNW
WNW

 2 / 4 mph 49 / 49°F 72% 1013 mb
Low level cloud: 64%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
18:00

WSW
WSW

 10 / 21 mph 45 / 39°F 82% 1002 mb
Low level cloud: 15%
Mid level cloud: 24%
High level cloud: 14%
Most Significant Cloud Type: low
25%
0.0 In
Mon 03
Nov		00:00

W
W

 5 / 11 mph 44 / 40°F 89% 993 mb
Low level cloud: 34%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
50%
0.0 In
06:00

S
S

 13 / 26 mph 47 / 41°F 91% 999 mb
Low level cloud: 88%
Mid level cloud: 67%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

 16 / 34 mph 50 / 45°F 80% 1001 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
18:00

S
S

 12 / 25 mph 53 / 49°F 89% 995 mb
Low level cloud: 90%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Tue 04
Nov		00:00

SSW
SSW

 8 / 16 mph 39 / 34°F 90% 1007 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

SSW
SSW

 10 / 21 mph 52 / 48°F 90% 991 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 76%
Most Significant Cloud Type: low
20%
0.1 In
12:00

SE
SE

 11 / 23 mph 50 / 46°F 80% 1006 mb
Low level cloud: 20%
Mid level cloud: 84%
High level cloud: 33%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

S
S

 10 / 21 mph 56 / 54°F 90% 993 mb
Low level cloud: 42%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
64%
0.0 In
Wed 05
Nov		00:00

ESE
ESE

 18 / 39 mph 50 / 44°F 94% 995 mb
Low level cloud: 98%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
06:00

SSW
SSW

 14 / 29 mph 49 / 44°F 79% 993 mb
Low level cloud: 56%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
63%
0.0 In
12:00

SE
SE

 15 / 31 mph 56 / 53°F 93% 990 mb
Low level cloud: 93%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSW
SSW

 22 / 46 mph 53 / 48°F 81% 984 mb
Low level cloud: 69%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
82%
0.2 In
Thu 06
Nov		00:00

SSW
SSW

 15 / 32 mph 57 / 53°F 91% 986 mb
Low level cloud: 89%
Mid level cloud: 69%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WSW
WSW

 15 / 31 mph 45 / 38°F 84% 984 mb
Low level cloud: 35%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: low
58%
0.2 In
12:00

WNW
WNW

 18 / 38 mph 48 / 41°F 70% 1001 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.1 In
18:00

SSW
SSW

 9 / 19 mph 48 / 44°F 89% 992 mb
Low level cloud: 46%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.1 In
Fri 07
Nov		00:00

WSW
WSW

 10 / 20 mph 42 / 37°F 76% 1011 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
06:00

SSW
SSW

 7 / 16 mph 41 / 36°F 92% 989 mb
Low level cloud: 34%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
12:00

S
S

 8 / 17 mph 50 / 47°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 27%
Most Significant Cloud Type: medium
26%
0.0 In
18:00

W
W

 21 / 43 mph 46 / 38°F 82% 996 mb
Low level cloud: 85%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sat 08
Nov		00:00

SSE
SSE

 9 / 19 mph 44 / 39°F 89% 1013 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
17%
0.0 In
06:00

WSW
WSW

 14 / 30 mph 45 / 38°F 78% 1003 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.1 In
12:00

SSE
SSE

 4 / 9 mph 47 / 45°F 94% 1011 mb
Low level cloud: 45%
Mid level cloud: 91%
High level cloud: 33%
Most Significant Cloud Type: low
81%
0.1 In
18:00

SE
SE

 20 / 41 mph 47 / 40°F 93% 992 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Sun 09
Nov		00:00

SW
SW

 5 / 11 mph 44 / 42°F 94% 1017 mb
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
29%
0.0 In
06:00

WSW
WSW

 6 / 12 mph 42 / 38°F 96% 991 mb
Low level cloud: 42%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
12:00

S
S

 7 / 14 mph 53 / 51°F 80% 1019 mb
Low level cloud: 2%
Mid level cloud: 28%
High level cloud: 8%
Most Significant Cloud Type: medium
33%
0.0 In
18:00

WNW
WNW

 9 / 18 mph 48 / 44°F 79% 1006 mb
Low level cloud: 85%
Mid level cloud: 45%
High level cloud: 0%
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.
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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