DISCUSSION: As of earlier today (local time), there was a weak low-pressure system centered over far northern sections of Italy. This is depicted quite well in the lower graphic found above (courtesy of the University of Wyoming's Upper-Air Data Archive) by way of the 1470 decameter height contour which covered northern/central Italy and the Northern Adriatic Sea. The presence of this weak low-pressure system helping to facilitate southerly flow in the direction of northeast Italy as well as far western portions of Croatia. The combination of the southerly flow closer to the surface coupled with increasingly stronger southwesterly/westerly flow aloft helped to generate environmental conditions conducive for thunderstorms capable of producing tornadoes and/or waterspouts as shown in the footage below (courtesy of IstraMet). Though this particular waterspout spinning over the northern Adriatic Seas appeared to be fairly far from the shoreline, this certainly was of great concern to mariners and other shipping interests in that region. Therefore, when there are forecasts for possible waterspout occurrence it is always prudent to "Keep your eye to the skies."
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~Weather Forecaster Christine Clements