confirmed its position.
During the forecast period in-flight
reports might further confirm the analysis.
Next day, with no
obvious variation in the surface analysis, the in-flight reports
could show the complete absence of the equatorial front both in
thes weather end wind figlas,
This has bsen the experience time
and tice again of forecasters in the North ana the South racific,
and has given rise to complicated tneories of intensity onange,
with little dynamic or synoptic backing.
We cannot leave this topic witiout reference to the work
done in the Philippine Islands by Father Deppermann.
In a long
series of papers he has devoted nimself to investigating the
relation between the equatorial front and the origin of typnoons.
It was thought, and still is by many meteorologists, that typhoons
originate or are generated on the equatorial front in the same
way as extra-tropical cyclones are generated as. waves on the
polar front.
Using the classical methods of the Bergen school,
the group of meteorologists of whom Depperman is the most
Boo
distinguished representative identified "air-masses" in the
neighborhood of the equator, discovered triple points where
|
|
three fronts met, and where typhoons were supposed to originate, _
ct
and finally discovered woll-uarked fronts even in the central
-
portions of the mature typhoon.
.
Great significance was attri-
7 | :
‘buted to smal} differences in temperature, to the-supposed
eo
source regions of the air masses and to the slope of the fronts. |
It should be emphasized that a large part of tnis work was based
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