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Naknek River King Salmon 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Naknek River King Salmon

Alaska, United States Of America

Long range weather outlook for Naknek River King Salmon includes 14 day forecast summary:

The forecast for Naknek River King Salmon in the coming two weeks is predicting the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 18°C expected on the afternoon of Wednesday 29th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Thursday 23rd at 2°C. Expect the following 14 days ahead to have most days seeing a little rain, sleet or snow. The indicators are that Tuesday 21st will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 20
May
00:00

SSE
SSE

2 / 3 mph 36 / 36°F 93% 1017 mb
Low level cloud: 59%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

2 / 5 mph 35 / 33°F 94% 1017 mb
Low level cloud: 20%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

3 / 6 mph 37 / 34°F 93% 1016 mb
Low level cloud: 23%
Mid level cloud: 99%
High level cloud: 31%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 6 mph 46 / 42°F 72% 1014 mb
Low level cloud: 21%
Mid level cloud: 34%
High level cloud: 4%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

7 / 8 mph 52 / 48°F 56% 1013 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

9 / 11 mph 54 / 50°F 48% 1011 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 80%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

9 / 12 mph 44 / 40°F 77% 1011 mb
Low level cloud: 94%
Mid level cloud: 83%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

8 / 11 mph 43 / 39°F 76% 1010 mb
Low level cloud: 94%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
15:00

SSE
SSE

10 / 11 mph 49 / 45°F 74% 1006 mb
Low level cloud: 75%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

15 / 18 mph 50 / 44°F 66% 1006 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
21:00

S
S

15 / 22 mph 44 / 37°F 69% 1006 mb
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

SSW
SSW

13 / 19 mph 42 / 35°F 78% 1007 mb
Low level cloud: 42%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

10 / 14 mph 39 / 33°F 79% 1008 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

9 / 13 mph 39 / 32°F 86% 1008 mb
Low level cloud: 94%
Mid level cloud: 65%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 13 mph 41 / 34°F 78% 1009 mb
Low level cloud: 100%
Mid level cloud: 76%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

11 / 13 mph 42 / 36°F 78% 1011 mb
Low level cloud: 96%
Mid level cloud: 58%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

14 / 17 mph 44 / 37°F 68% 1012 mb
Low level cloud: 88%
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
18:00

WSW
WSW

14 / 16 mph 43 / 36°F 69% 1013 mb
Low level cloud: 60%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

12 / 16 mph 39 / 31°F 81% 1015 mb
Low level cloud: 59%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

10 / 13 mph 36 / 29°F 88% 1017 mb
Low level cloud: 100%
Mid level cloud: 23%
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

SW
SW

8 / 11 mph 36 / 30°F 85% 1018 mb
Low level cloud: 100%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

6 / 9 mph 36 / 30°F 86% 1018 mb
Low level cloud: 97%
Mid level cloud: 6%
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

SSW
SSW

5 / 6 mph 38 / 34°F 77% 1018 mb
Low level cloud: 92%
Mid level cloud: 76%
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

SW
SW

5 / 5 mph 43 / 40°F 65% 1018 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

4 / 4 mph 50 / 48°F 53% 1016 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

5 / 6 mph 50 / 48°F 55% 1014 mb
Low level cloud: 1%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

3 / 6 mph 45 / 44°F 67% 1013 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SW
SW

2 / 2 mph 43 / 43°F 82% 1012 mb
Low level cloud: 97%
Mid level cloud: 91%
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

S
S

1 / 2 mph 42 / 42°F 90% 1010 mb
Low level cloud: 100%
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

SSW
SSW

5 / 7 mph 42 / 38°F 97% 1009 mb
Low level cloud: 100%
Mid level cloud: 53%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

W
W

9 / 11 mph 41 / 35°F 95% 1010 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WSW
WSW

7 / 9 mph 45 / 41°F 77% 1009 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 14%
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 46 / 41°F 72% 1008 mb
Low level cloud: 98%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

7 / 9 mph 45 / 41°F 71% 1007 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 46%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

5 / 7 mph 42 / 39°F 77% 1007 mb
Low level cloud: 14%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

WNW
WNW

5 / 8 mph 37 / 33°F 91% 1007 mb
Low level cloud: 27%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

3 / 5 mph 36 / 34°F 95% 1007 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

2 / 3 mph 39 / 38°F 91% 1007 mb
Low level cloud: 93%
Mid level cloud: 43%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

4 / 4 mph 40 / 38°F 78% 1007 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

4 / 4 mph 44 / 42°F 66% 1008 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
15:00

NW
NW

4 / 4 mph 47 / 45°F 61% 1008 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

6 / 7 mph 49 / 45°F 62% 1008 mb
Low level cloud: 49%
Mid level cloud: 96%
High level cloud: 32%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

5 / 8 mph 45 / 42°F 75% 1009 mb
Low level cloud: 87%
Mid level cloud: 78%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

NW
NW

4 / 8 mph 44 / 41°F 78% 1010 mb
Low level cloud: 83%
Mid level cloud: 57%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

7 / 11 mph 43 / 38°F 89% 1011 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 16%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

6 / 9 mph 43 / 39°F 91% 1012 mb
Low level cloud: 94%
Mid level cloud: 44%
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

NNW
NNW

6 / 8 mph 45 / 42°F 85% 1013 mb
Low level cloud: 94%
Mid level cloud: 71%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

9 / 10 mph 52 / 48°F 70% 1013 mb
Low level cloud: 89%
Mid level cloud: 91%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

11 / 12 mph 55 / 51°F 64% 1014 mb
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 42%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

12 / 15 mph 55 / 51°F 66% 1014 mb
Low level cloud: 83%
Mid level cloud: 51%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

7 / 13 mph 50 / 47°F 76% 1016 mb
Low level cloud: 73%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 27
May
03:00

NW
NW

5 / 8 mph 45 / 42°F 86% 1016 mb
Low level cloud: 65%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
09:00

NW
NW

3 / 6 mph 52 / 52°F 66% 1013 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
15:00

SSW
SSW

4 / 7 mph 59 / 59°F 58% 1014 mb
Low level cloud: 20%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
21:00

W
W

7 / 13 mph 48 / 45°F 79% 1009 mb
Low level cloud: 19%
Mid level cloud: 48%
High level cloud: 93%
Most Significant Cloud Type: low
47%
0.0 In
Tue 28
May
03:00

SSE
SSE

9 / 16 mph 47 / 42°F 87% 1014 mb
Low level cloud: 96%
Mid level cloud: 99%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.0 In
09:00

NW
NW

1 / 2 mph 51 / 51°F 78% 1020 mb
Low level cloud: 37%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
15:00

W
W

5 / 9 mph 59 / 59°F 51% 1012 mb
Low level cloud: 18%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
36%
0.0 In
21:00

SSW
SSW

7 / 12 mph 57 / 56°F 63% 1013 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
0.0 In
Wed 29
May
03:00

SW
SW

4 / 9 mph 42 / 39°F 79% 1013 mb
Low level cloud: 37%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.0 In
09:00

N
N

4 / 8 mph 51 / 50°F 67% 1013 mb
Low level cloud: 15%
Mid level cloud: 48%
High level cloud: 9%
Most Significant Cloud Type: medium
90%
0.0 In
15:00

S
S

6 / 11 mph 48 / 46°F 70% 1011 mb
Low level cloud: 97%
Mid level cloud: 47%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
21:00

W
W

7 / 14 mph 53 / 51°F 67% 1009 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
0.0 In
Thu 30
May
03:00

E
E

2 / 4 mph 42 / 42°F 86% 1008 mb
Low level cloud: 81%
Mid level cloud: 21%
High level cloud: 44%
Most Significant Cloud Type: low
93%
0.0 In
09:00

SSW
SSW

4 / 7 mph 54 / 54°F 67% 1008 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 96%
Most Significant Cloud Type: medium
20%
0.0 In
15:00

SSE
SSE

3 / 6 mph 55 / 56°F 50% 1006 mb
Low level cloud: 36%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
82%
0.0 In
21:00

SSE
SSE

6 / 12 mph 47 / 44°F 89% 1014 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.1 In
Fri 31
May
03:00

NNE
NNE

3 / 7 mph 41 / 40°F 87% 1010 mb
Low level cloud: 41%
Mid level cloud: 45%
High level cloud: 48%
Most Significant Cloud Type: low
62%
0.0 In
09:00

ESE
ESE

4 / 7 mph 49 / 48°F 67% 1015 mb
Low level cloud: 4%
Mid level cloud: 31%
High level cloud: 39%
Most Significant Cloud Type: medium
42%
0.0 In
15:00

WNW
WNW

1 / 2 mph 54 / 54°F 55% 1013 mb
Low level cloud: 71%
Mid level cloud: 43%
High level cloud: 86%
Most Significant Cloud Type: low
96%
0.0 In
21:00

NNW
NNW

2 / 3 mph 51 / 51°F 70% 1012 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: low
79%
0.0 In
Sat 01
Jun
03:00

S
S

4 / 8 mph 41 / 38°F 93% 1015 mb
Low level cloud: 32%
Mid level cloud: 32%
High level cloud: 76%
Most Significant Cloud Type: low
52%
0.0 In
09:00

E
E

4 / 9 mph 50 / 49°F 67% 1013 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 16%
Most Significant Cloud Type: medium
31%
0.0 In
15:00

W
W

10 / 20 mph 56 / 53°F 54% 1013 mb
Low level cloud: 49%
Mid level cloud: 39%
High level cloud: 13%
Most Significant Cloud Type: low
63%
0.0 In
21:00

E
E

9 / 18 mph 50 / 46°F 68% 1007 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 95%
Most Significant Cloud Type: medium
24%
0.0 In
Sun 02
Jun
03:00

S
S

5 / 9 mph 37 / 33°F 92% 1012 mb
Low level cloud: 3%
Mid level cloud: 30%
High level cloud: 14%
Most Significant Cloud Type: medium
38%
0.0 In
09:00

N
N

10 / 19 mph 49 / 44°F 86% 999 mb
Low level cloud: 38%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.0 In
15:00

SSW
SSW

5 / 10 mph 59 / 58°F 46% 1007 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
65%
0.0 In
21:00

N
N

9 / 17 mph 50 / 47°F 81% 996 mb
Low level cloud: 77%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Mon 03
Jun
03:00

SSE
SSE

2 / 5 mph 40 / 39°F 81% 1003 mb
Low level cloud: 17%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: low
34%
0.0 In
09:00

ENE
ENE

17 / 35 mph 52 / 47°F 62% 1000 mb
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: low
18%
0.0 In
15:00

E
E

15 / 30 mph 49 / 44°F 62% 997 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
21:00

E
E

10 / 21 mph 48 / 44°F 73% 1005 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: medium
45%
0.0 In
Tue 04
Jun
03:00

ENE
ENE

10 / 21 mph 42 / 36°F 85% 992 mb
Low level cloud: 8%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
19%
0.0 In
09:00

E
E

8 / 17 mph 49 / 46°F 71% 1008 mb
Low level cloud: 30%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
15:00

E
E

21 / 43 mph 53 / 48°F 62% 990 mb
Low level cloud: 44%
Mid level cloud: 37%
High level cloud: 3%
Most Significant Cloud Type: low
57%
0.0 In
21:00

E
E

6 / 11 mph 48 / 46°F 82% 1010 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In

Other Locations Near to Naknek River King Salmon

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