Impacts of cloud flare-ups on hurricane intensity resulting from departures from balance laws

T. N. Krishnamurti; Anu Simon; Mrinal Kanti Biswas; Christopher Davis

doi:10.3402/tellusa.v64i0.18399

Impacts of cloud flare-ups on hurricane intensity resulting from departures from balance laws

Tellus

Volume 64 (2012): Issue 1

By: T. N. Krishnamurti, Anu Simon, Mrinal Kanti Biswas and Christopher Davis

Open Access

|Dec 2012

Abstract

Cloud flare-ups along the inner eye wall of a hurricane lead to enhancement of cloud scale divergence, which in turn leads to a large local enhancement of the departure from balance laws and can lead to local supergradient winds. This scenario is tested using the results from a mesoscale microphysical model at horizontal resolution of 1.33 km for the simulation of hurricane Katrina. Rainwater mixing ratio tags growing cloud elements. The departure from balance laws includes terms such as the local, horizontal and vertical advections of divergence, divergence square and a term invoking the gradient of vertical velocity. It is noted that these terms collectively contribute to a substantial local enhancement of the departure from balance laws. Departures from balance laws are related to the radial gradient wind imbalances in a storm-centred coordinate. In this study, several examples, from the hurricane Katrina simulations, that display this scenario of rapid intensification are illustrated. Organisation of convection in the azimuthal direction seems important for the hurricane scale; cloud flare-ups away from such regions of azimuthal organisation fail to contribute to this scenario for the overall intensification of the hurricane.

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