APPENDIX G: SEA LEVEL PRESSURE
Sea level pressure statistics for Anchorage, Kenai, Homer, and Kodiak, Alaska, are
presented. The data were assembled and summarized specifically for this project by the
Air Force Combat Climatology Center as described in Section 6.1 (Source and De-
scription of Climatological Data for Cook Inlet) from hourly observations of the sea
level pressure for Jan. 1973Dec. 1997 (except Jan. 1973Oct. 1997 for Homer). The
graphs on the left of the page represent cumulative percent frequency distribution curves
for each month of the year. The values listed in the upper left corner of each graph are
the extreme maximum and minimum pressures, the mean monthly maximum and mini-
mum pressures, and the total number of observations for the period of record. The
second graph (in bar-chart form) shows the frequency distribution of sea level pressure
observations and the mean pressure associated with winds from each compass direc-
tion and for calm winds.
Extreme maximum (mb)
Mean monthly maximum (mb)
Mean monthly minimum (mb)
Extreme minimum (mb)
Total number of observations
January
100
1010.4
Calm
1054.4
80
1009.9
1004.0
N
1001.2
1007.2
NE
965.4
60
1009.4
E
18,163
1005.4
SE
40
1002.9
S
1003.7
SW
1003.2
W
20
1004.2
NW
0
960
980
1000
1020
1040
1060
60
50
40
30
20
10
0
Sea Level Pressure (mb)
Frequency (%)
50% of all recorded sea
level pressures were less
than or equal to the
Percentage of sea level
mean monthly pressure
pressures recorded when
of 1005.6 mb.
the winds were from the
NW direction
Cumulative
sea level
Mean sea level pressure
pressure
(mb) during all NW wind
frequency
observations
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