2 aeigs
during tne winter months
The Krakotoa Easterlies are weakest
of December through February and reach their maximum
strength in the late summer or early autumn from August to October.
Lack of obHow-
gervational data precludes any positive statement concerning their extent.
ever, they are generally observed above altitudes of 60,000 feet extending up-
.
ward as high as balloon soundings have reached.
+
surface trades.
BRE Yk ak te
on an annual
These upper easterlies are the
Thelr steadiness exceeds that of the
gteadlest and most persistent winds known.
The variation of surface air temperature at Eniwetok is ex-
Temperature.
tremely small ~- a fact assoclated with its oceanic location and its latitude
4
*
4ength of the daylight period (sunrise to sunset) at Eniwetok ranges from
12 hours,
than 5% of the time
and Over 1.00,
The interv:
more.
ESSeeeare| Beeeet yeccd:
normally called the Krakatoa Easterlles.
46 minutes to 11 hours,
29 minutes.
Energy received at the outer
atmosphere ranges from about 890 to about 600 cal./cm.°/day.
List, Smithsonian Meteorological Tables, 6th edition).
(After Robert J.
For times of sunrise and
sunset see Table 2,
There is more temperature difference between night and day than there is between
January and July.
showers,
The greatest temperature changes are observed during rain
ag a result of evaporative cooling.
Mean-maximum and mean-minimum
temperatures by month are given for Eniwetok in Table I.
than 1 per Cent of
the time,
Cloudiness.,
;
teem
gr
The dry season is normally considered to extend from mid-
November through March and during this time total sky cover averages about 5
er than those
On is take
+ Bas ed on observations
2 Measurable
0. 5 l~-l. 00
Jess May 195),
June 1949-9
uly 1955,
July 1945-March 1 947
Ter
wt
<f
5d
6
als used for tabula
ting
tet
.
dd
Jj}
Bu
Zz>
the frequency of
rainfall amount
s
basis 3 Windspeeds
above 3] MeDehe
Qe3
SR
iS ceton
tenths.
There is little if any observable diurnal variation in cloud amount.
The dominant cloud form during this season 1s the typical trade wind cumulus with
bases at about 1,800 feet and tops extending to the 4,000-5,000-faot level.
Some middle cloudiness and cirrus may be observed in association with disturbed
conditions in the more active convective areas located further south.
As the
season advances from April to late August or early September the cumuli typically present increase in vertical development go that by late summer cloud
tops are normally found at the 8,000-9,000-foot level.
At the same time,
the
amount of sky cover increases to an average of 6 or 7 tenths, due in part to
more active cumulus development and in part to the more frequent appearance of
Pe
Name
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