Stručni rad

TORNADOES AT NOVIGRAD, ISTRIA, ON AUGUST 14, 2006

André Simon ; Slovenský hydrometeorologický ústav Jeséniova 17, 833 15 Bratislava, Slovensko
Tomislav Kovačić ; Državni hidrometeorološki zavod Grič 3, 10000 Zagreb, Hrvatska

Sažetak

The study presents the case of two tornadoes observed on August 14, 2006, in the vicinity of Novigrad, on the Istrian peninsula. The descriptions of the tornado events are based on visual observation and on photo-documentation. The synoptic and mesosynoptic conditions for thunderstorm generation have been analyzed by using EUMETSAT Meteosat Second Generation (MSG) satellite imagery and ALADIN numerical model outputs. The
accessible data give evidence of non-supercellular tornadoes related to a narrow line of convective clouds that probably formed at the outflow boundary of an older convective system. It is shown that traits of intense convection could be detected in the evaluated case by using RGB composites of satellite channels. Streamwise vorticity has been diagnosed from parameters like Storm to Relative Environmental Helicity (SREH) and Energy Helicity Index (EHI),
supposing that it had a support role in the formation of the tornadic thunderstorms. It is concluded that very high resolution data and more information about the mesosynoptic setting of tornadogenesis are needed for an operational recognition of potential hazards by similar events.

Ključne riječi

tornado; Istria; satellite,diagnostic parameters; non-supercellular

Hrčak ID:

64351

URI

https://hrcak.srce.hr/64351

Datum izdavanja:

14.12.2006.

Posjeta: 1.189 *