Diurnal Weather Patterns— -LEOPOLD 
89 
WIND SPEED 
SUMMER 
FIG. 40 
FIG. 4 C HEIGHT OF TEMPERATURE INVERSION 
„ —-°^ 
- * 
. JUNE 27, 1! 
^ J 
^^HYI 
POTHETICAL 1 
CURVE 
o / 0 ”' , 
MEAN 
X 
o 
- 
■ / 
/ 
0 
/ 
+ / 
/ 
/ 
t 
V © 
V 
\ 
V 
© 
+/! 
*Z*JUNE 26,<-7 
1 
V 
MEAN 
FOR 
24 DAYS WITH INVERSION 
MAY 12 
TO JULY 9, 1947 
X 
MEAN 
FOR 
NOVEMBER 1946 
O 
MEAN 
FOR 
SEPTEMBER 1946 
m 
MEAN 
FOR 
AUGUST 1946 
+ 
MEAN 
FOR 
NOVEMBER 1946 AT WEATHER 
SHIP “BIRD DOS , 50°N, I40°W LOCAL 
TIKE FOR THAT LONGITUDE 
MEAN FOR SEPTEMBER 1946 AT WEATHER 
SHIP "BIRD DOS’ 
HOUR OF DAY LOCAL STD TIME 
Fig. 4. Diurnal changes of surface wind speed and of the height of the temperature inversion. 
speeds than the open ocean (Kaneohe). The 
night winds at island stations are of much lower 
speed. It is quite clear, therefore, that the 
strong diurnal change in wind experienced by 
island stations is the result of a nocturnal reduc¬ 
tion in speed relative to that over the open 
ocean. 
At Waialua the daytime wind is of moderate 
speed from the east-northeast. The nocturnal 
wind is light and from the southeast. The vector 
which must be added to the trade wind to pro¬ 
duce the observed night velocity is from the 
southwest or from the Waianae Range. 
At Waipahu the northwest night wind must 
be caused by a vector from the west added to 
the trade wind. This westerly component again 
comes from the direction of the Waianae Range. 
Honolulu experiences no diurnal change in 
direction but lower speeds at night than during 
the day. A sea-breeze component would tend to 
reduce the daytime wind speed while a land 
breeze should increase the nighttime speeds. 
Therefore, the real winds must be still greater 
during the day and less at night than the ob¬ 
served winds. 
Part of the diurnal speed changes at Kaneohe 
must be due to sea-land-breeze effects which 
would tend to produce the observed winds, with 
greater speeds during the day than at night. 
Surface friction would account for the slightly 
