Hurricanes form over tropical waters in areas of high humidity, light winds, and warm sea surface temperatures.

However, over the following hours, satellite imagery revealed a slightly better organized Bertha as the system entered an area of warmer sea surface temperatures.

During the next day, the depression weakened with the low level circulation center becoming partially exposed, as it moved over an area of cold sea surface temperatures.

Tracking over an area of high sea surface temperatures, rapid intensification ensued during the latter half of October 21.

It was located over an area of warm sea surface temperatures and moderate wind shear, which favored gradual intensification.

Located within an area of weak vertical wind shear and warm sea surface temperatures, the depression intensified.

However, Victoria began to weaken rapidly as it moved over an area of cool sea surface temperatures and weakened to a category 1 by April 11.

The storm moved through an area of marginal sea surface temperatures of 77 F (25 C).

Joyce dissipated in an area of low wind shear and warm sea surface temperatures.

Accompanied by low wind shear, favorable outflow, and over an area of high sea surface temperatures, the system consolidated into a depression the following day.