27/08/2024
One of the hypotheses for the Bayesian yacht accident is the presence of a downdraft. This is a rapidly descending air-flow, typically associated to a thunderstorm, that, reaching the ground, radiates with potentially very high speed. This can be very high indeed. We provide a rare example of a downdraft recording, happened at the location of the CNR-ISMAR oceanographic tower, located in the Adriatic Sea, 15 km offshore the Venice coast. As seen in the associated plots (the event happened on July 6, 2008), following a thunderstorm in a few minutes wind increased from 3 m/s to 30 m/s (108 km/h), with gusts that for 15 minutes were above the capability of the instrument (40 m/s, 144 km/h). In the same time waves increased from 30 cm to more than 3 m height, with a continuously changing direction.
Paper: Bastianini, Cavaleri, la Rocca, “An extreme meteorological event at the ISMAR oceanographic tower”, Nat. Hazards Earth Syst. Sci., 12, 281-285, 2012, available from mauro.bastianini@cnr.it, ph. +39-041-2407982, luigi.cavaleri@ismar.cnr.it, ph. +39-041-2407955.
Per informazioni:
Luigi Cavaleri
Cnr-Ismar
luigi.cavaleri@ismar.cnr.it
041/2407955
Mauro Bastianini, Cnr-Ismar, tel. 041/2407982, mauro.bastianini@cnr.it
Ufficio stampa:
Sandra Fiore
Ufficio stampa Cnr
sandra.fiore@cnr.it
Responsabile Unità Ufficio stampa:
Emanuele Guerrini
emanuele.guerrini@cnr.it
ufficiostampa@cnr.it
06 4993 3383
Immagini: