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<p>when there are strong upper level forces on the system. When pressures fall more than 1 mbar per hour, the process is called explosive cyclogenesis, and the cyclone can be described as a <a href="page.php?w=Bomb_%28meteorology%29">bomb</a>. These bombs rapidly drop in pressure to below 980 mbar under favorable conditions such as near a natural <a href="page.php?w=temperature_gradient">temperature gradient</a> like the <a href="page.php?w=Gulf_Stream">Gulf Stream</a>, or at a preferred quadrant of an upper-level jet streak, where upper level divergence</p><p>
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