IDENTIFYING PRECURSOR CONDITION FOR “PUTING BELIUNG” EVENT IN PANGKALPINANG

- Siswanto, - Supari

Abstract


This paper discusses an effort to identify the precursor condition for “puting beliung” or tornado-like event
which was occured in Pangkalpinang town on January 9, 2008. The analyses has been done based on the dynamic
pipe effect of tornado genesis theory. Several data obtained from surface observation as well as the advantage of
satellite data image were used to identify signal of presence of puting beliung. The result indicates that the puting
beliung event was triggered by the presence of low level wind shear which was supported by favorable surface
condition such as the existing of enough water vapor aloft indicated by high relative humidity, enough surface
heating to initiate a rapid cooling of the atmosphere to produce deep convection, and there is an initiation of a
local anomaly surface wind speed to produce low level wind shear. Revealed surface precursor for puting beliung
in Pangkalpinang are the rapid increasing the relative humidity one hour in advance, together with rapid drop in
temperature and the presence of “horn-like” pressure anomaly.


Keywords


Puting beliung, Tornado, Pangkalpinang, Deep convection, Low level wind shear, Precursor

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DOI: http://dx.doi.org/10.14203/widyariset.15.3.2012.599–610

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