Dampening the 'seeds' of hurricanes | ScienceDaily

Increased atmospheric moisture may alter critical weather patterns over Africa, making it more difficult for the predecessors of many Atlantic hurricanes to form, according to a new study published this month.

The researchers found that a moister environment produced weaker and slower-moving African easterly waves, or disturbances which are the primary precursor or"seed" for hurricanes in the Atlantic. The addition of moisture moved the location of thunderstorms within the wave, making it harder for the wave to grow. Increased moisture also slowed the movement of the wave resulting in weaker and delayed hurricane seed formation by the time it reached eastern Atlantic waters.

The researchers started the experiment by using MPAS to reproduce a moisture-driven African easterly wave that became hurricane Helene in 2006. The team used that base to add or take away moisture and study what happened with those changes. The conditions leading to tropical cyclone formation are complex, but researchers hope these newer modeling techniques will lead to better predictions. For instance, Núñez Ocasio is beginning to run simulations where she alters other atmospheric variables key to generating tropical cyclones.

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