h2><span class="mw-headline" id="Causes">Causes</span></h2>
<p>Floods in St. Petersburg are caused by several factors. <a href="//en.wikipedia.org/wiki/Cyclone" title="Cyclone">Cyclones</a>, originating in the <a href="//en.wikipedia.org/wiki/Baltic_Sea" title="Baltic Sea">Baltic Sea</a> with a prevalence of west winds, induce a "slow" matched <a href="//en.wikipedia.org/wiki/Kelvin_wave" title="Kelvin wave">Kelvin wave</a> to rise and move towards the delta of Neva River where it meets the natural river fl