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Knockerdown 14 Day Long Range Forecast

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

Derbyshire, United Kingdom

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

The outlook for Knockerdown in the two weeks ahead shows the average daytime maximum temperature will be around 7°C, with a high for the two weeks of 11°C expected on the afternoon of Wednesday 15th. The average minimum temperature will be 2°C, dipping to its lowest on the morning of Sunday 19th at 0°C. The coming 14 days will remain predominantly dry. On the whole winds are likely to be light. The strongest wind will be experienced on the afternoon of Saturday 25th, coming from a north westerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
Jan		18:00

WSW
WSW

 4 / 7 mph 43 / 42°F 77% 1032 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 4 / 8 mph 41 / 38°F 64% 1033 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
Jan		00:00

WSW
WSW

 4 / 9 mph 39 / 36°F 58% 1032 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 96%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 10 mph 38 / 35°F 59% 1032 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 4 / 9 mph 37 / 34°F 60% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 6 / 12 mph 36 / 32°F 64% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 7 / 12 mph 46 / 43°F 65% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 7 / 13 mph 46 / 42°F 72% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 7 / 15 mph 40 / 35°F 89% 1031 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 9 / 18 mph 40 / 34°F 97% 1032 mb
Low level cloud: 51%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
Jan		00:00

SW
SW

 11 / 15 mph 44 / 38°F 93% 1032 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 8 / 17 mph 40 / 34°F 94% 1032 mb
Low level cloud: 24%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 7 / 15 mph 37 / 31°F 94% 1032 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 6 / 13 mph 36 / 31°F 93% 1033 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 8 / 10 mph 46 / 42°F 80% 1032 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 8 / 11 mph 46 / 42°F 84% 1032 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 6 / 10 mph 42 / 38°F 91% 1032 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 6 / 13 mph 37 / 33°F 90% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
Jan		00:00

SW
SW

 6 / 14 mph 34 / 28°F 90% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 7 / 15 mph 32 / 26°F 89% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
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

SSW
SSW

 6 / 13 mph 31 / 25°F 90% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 6 / 12 mph 32 / 27°F 91% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 8 / 9 mph 43 / 38°F 75% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 5 / 7 mph 43 / 39°F 80% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 5 / 10 mph 37 / 33°F 89% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 5 / 10 mph 33 / 28°F 93% 1024 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
Jan		00:00

SSW
SSW

 4 / 9 mph 32 / 28°F 92% 1022 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 4 / 9 mph 31 / 27°F 92% 1021 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 4 / 9 mph 31 / 27°F 93% 1019 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 8 mph 32 / 29°F 92% 1018 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 5 / 6 mph 42 / 39°F 80% 1017 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 6 / 7 mph 41 / 37°F 86% 1015 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 7 / 13 mph 34 / 28°F 96% 1016 mb
Low level cloud: 64%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 7 / 15 mph 36 / 30°F 92% 1015 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 93%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
Jan		00:00

SSW
SSW

 8 / 17 mph 36 / 30°F 96% 1015 mb
Low level cloud: 65%
Mid level cloud: 50%
High level cloud: 63%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 13 / 20 mph 39 / 32°F 96% 1015 mb
Low level cloud: 80%
Mid level cloud: 38%
High level cloud: 32%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 12 / 18 mph 40 / 33°F 96% 1015 mb
Low level cloud: 79%
Mid level cloud: 52%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 10 / 15 mph 40 / 33°F 97% 1016 mb
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 13 / 15 mph 45 / 38°F 90% 1016 mb
Low level cloud: 66%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 10 / 13 mph 45 / 40°F 91% 1016 mb
Low level cloud: 70%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 9 / 15 mph 41 / 36°F 96% 1017 mb
Low level cloud: 69%
Mid level cloud: 11%
High level cloud: 97%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 6 / 13 mph 37 / 32°F 95% 1018 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
Jan		00:00

SSW
SSW

 6 / 12 mph 39 / 34°F 92% 1018 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 69%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 6 / 12 mph 37 / 33°F 94% 1019 mb
Low level cloud: 15%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 4 / 10 mph 38 / 35°F 94% 1018 mb
Low level cloud: 16%
Mid level cloud: 95%
High level cloud: 12%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 5 / 11 mph 40 / 36°F 94% 1019 mb
Low level cloud: 15%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 8 / 10 mph 46 / 42°F 91% 1020 mb
Low level cloud: 58%
Mid level cloud: 96%
High level cloud: 11%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 6 / 7 mph 46 / 43°F 90% 1019 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 38%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 5 / 8 mph 45 / 42°F 87% 1019 mb
Low level cloud: 82%
Mid level cloud: 97%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 4 / 6 mph 44 / 42°F 88% 1019 mb
Low level cloud: 69%
Mid level cloud: 100%
High level cloud: 80%
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
Wed 22
Jan		00:00

NNW
NNW

 2 / 3 mph 42 / 42°F 91% 1023 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
06:00

WNW
WNW

 10 / 20 mph 37 / 29°F 90% 1022 mb
Low level cloud: 15%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
12:00

S
S

 4 / 5 mph 47 / 45°F 72% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

E
E

 7 / 9 mph 43 / 38°F 70% 1034 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
Thu 23
Jan		00:00

NE
NE

 4 / 5 mph 42 / 40°F 89% 1034 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
06:00

N
N

 2 / 2 mph 39 / 38°F 89% 1035 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
12:00

ENE
ENE

 7 / 8 mph 43 / 39°F 72% 1033 mb
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
18:00

E
E

 2 / 3 mph 45 / 45°F 95% 1029 mb
Low level cloud: 31%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
46%
0.0 In
Fri 24
Jan		00:00

SSW
SSW

 8 / 11 mph 42 / 37°F 95% 995 mb
Low level cloud: 54%
Mid level cloud: 20%
High level cloud: 73%
Most Significant Cloud Type: low
69%
0.0 In
06:00

ESE
ESE

 2 / 4 mph 36 / 35°F 91% 1026 mb
Low level cloud: 2%
Mid level cloud: 31%
High level cloud: 10%
Most Significant Cloud Type: medium
35%
0.0 In
12:00

W
W

 19 / 23 mph 40 / 31°F 83% 999 mb
Low level cloud: 64%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.4 In
18:00

SE
SE

 5 / 8 mph 41 / 38°F 94% 1023 mb
Low level cloud: 25%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 25
Jan		00:00

E
E

 20 / 25 mph 35 / 24°F 100% 982 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.4 In
06:00

E
E

 3 / 5 mph 39 / 37°F 94% 1019 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 93%
Most Significant Cloud Type: medium
80%
0.0 In
12:00

WNW
WNW

 26 / 32 mph 38 / 27°F 93% 984 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.4 In
18:00

ESE
ESE

 5 / 6 mph 45 / 42°F 94% 1016 mb
Low level cloud: 28%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: low
45%
0.0 In
Sun 26
Jan		00:00

WSW
WSW

 14 / 24 mph 33 / 23°F 87% 1000 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
7%
0.0 In
06:00

SE
SE

 7 / 10 mph 45 / 41°F 99% 1016 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SSE
SSE

 12 / 17 mph 38 / 30°F 93% 994 mb
Low level cloud: 86%
Mid level cloud: 12%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 10 / 13 mph 44 / 38°F 92% 1024 mb
Low level cloud: 71%
Mid level cloud: 91%
High level cloud: 31%
Most Significant Cloud Type: low
100%
0.2 In
Mon 27
Jan		00:00

S
S

 20 / 26 mph 37 / 27°F 92% 982 mb
Low level cloud: 98%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WSW
WSW

 8 / 17 mph 38 / 32°F 88% 1030 mb
Low level cloud: 98%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 42 / 56 mph 42 / 30°F 80% 950 mb
Low level cloud: 81%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.5 In
18:00

S
S

 2 / 2 mph 54 / 55°F 91% 1033 mb
Low level cloud: 9%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: low
19%
0.0 In
Tue 28
Jan		00:00

WSW
WSW

 34 / 46 mph 39 / 26°F 68% 979 mb
Low level cloud: 35%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.1 In
06:00

SE
SE

 5 / 7 mph 34 / 30°F 84% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

WSW
WSW

 24 / 32 mph 42 / 32°F 70% 994 mb
Low level cloud: 7%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
0.0 In
18:00

SSE
SSE

 8 / 11 mph 37 / 31°F 85% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 29
Jan		00:00

WSW
WSW

 16 / 26 mph 36 / 27°F 80% 1002 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: medium
13%
0.0 In
06:00

S
S

 4 / 5 mph 34 / 30°F 95% 1019 mb
Low level cloud: 97%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 22 / 31 mph 46 / 38°F 96% 990 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

 3 / 5 mph 37 / 35°F 94% 1021 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
73%
0.1 In
Thu 30
Jan		00:00

WSW
WSW

 25 / 37 mph 39 / 29°F 71% 996 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.1 In
06:00

S
S

 3 / 4 mph 33 / 31°F 96% 1023 mb
Low level cloud: 47%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: low
50%
0.0 In
12:00

SW
SW

 24 / 34 mph 43 / 34°F 72% 998 mb
Low level cloud: 86%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
95%
0.0 In
18:00

S
S

 10 / 16 mph 37 / 30°F 92% 1025 mb
Low level cloud: 90%
Mid level cloud: 15%
High level cloud: 16%
Most Significant Cloud Type: low
96%
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