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OPERATIONSaEHO. 1-53
CLUEisPoLony OF BIVINI-ENTETO sREA FOR MONTHS OF JANUARY THROUGH APRIL
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1,
INTRODUCTION:
a, The following information for planning purposes is based on weather
records collected during ‘iorld War II and during post-war activities at the
:
ENIVETOK Proving Ground,
“eather statistics are useful but prove nothing unless
the results are subject to a complete physical explanation, Most meteorological
phenomena are not subject to such explanations, but brief reference is made to
the latest hypotheses which are the results of intensive research on tropical
weather, During short periods of a month or a season the atmosphere may behave’
in amamer strikingly different than past records may lead a planner to expect,
The ‘variatios from cmditions anticipated on the basis of past records are -
the responsibility of the Task Force weather units to detect, evaluate, am|a
in
=~predict,a
ey ee
a. "During this period, the "dry" or “trade season in the| WaronaLa"
Islands, northeasterly winds blow with greatpersistence in the lower levels,
Overlying the northeasterly or trede winds, the winds tend to becom westerly.
Both the trade winds and the higher predominantly westerly winds are subject
5
“ -shalis are attributed to these disturbances, In the lower levels the eddies
~
a¥e'most. intense along the aquatorward edge of the trade circulatim==(0 to 1W°—. in the Northern Hemisphere), These low level eddies are rapidlydampedto the” ~~
t
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4
_ to frequent cyclonic circulations or disturbances in the form of eddies, vortices,
or minor pertubations, Many of the variations of the weather over the Mar-
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Sat 2.Ben:GENERAL: 7
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__horth ani-rarely pass directly over the northern Marshalls; _ However, their
__formatitn,movement and decay contribute to significant day to. day charges_jin.
"thie BNIUET OK~BIKINE weather,
3.
seraee
FRONTS:3
a,
.
Jo)
The terms "Intertropical 1Front" ard "Equatorial Front" are in |
actuality misnomers, .A density discontinuity ami proper wind shear mst exist
to define a front, Rather conclusive evidence exists that significant hori-~
zontal density discontinuities do not exist in the Marshalls. ‘The areas
formerly designated "Intertropical or Equatorial Fronts" are-in reality the
_ paths of the low level eddies and vortices, ‘The pattern of circulation about
these disturbances produces
is along these lines md in
upward that middle ami high
- ami thunderstorms develop,
areas ani lines conducive.to vertical motim, It
the areas where vertical motions are predominantly
cloudiness becomes extensive, precipitatim -general,
The weather associated with these lines appears
similar to the weather accompanying the true fronts of higher latitudes, However, these lines do not form, do not rove, nor are they subject |to ithe same
_ forecasting techniques as true fronts,
r
a WEATHER:
;
.
;
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bons.
“The term "ary" for this seasoniss relative only, “Small, widely ~.
: scattered-showers falling from the prevalent "trade" cummlus clouds are nearly
“- vr -™==-- always within sight of ENIUETOK md BIKINI,
The science of meteorology has
.
hot developed to the point uhere the ‘precise location of individual showers —~ --~
can bereligbly Predicted, -_
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b. ' During these fox months’ in"theyears’"1950 through 1953, ‘Gnelusive,
ceilings have never been observed-at 500 feet or Jess, Visibilities have been.7
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observed below 3 miles on ™ average of one day ia1 20, Precipitation, including
~ TASK GROUP 7.4
OPRS ORDER NO, .1-53 .
7 ANNEX E, /APROX 3°+P
' Attachnonta:
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