Dr. Chen presented a seminar on “A Study on the Asymmetric Rapid Intensification of Hurricane Earl (2010) using the HWRF”.
In this study, the results of a forecast from the operational Hurricane Weather Research and Forecasting (HWRF) system for Hurricane Earl (2010) are verified against available observations and analyzed to understand the asymmetric rapid intensification of a storm in a sheared environment. The forecast verification shows that the HWRF model captured well Earl’s observed evolution of intensity, convection asymmetry, wind field asymmetry, and vortex tilt in terms of both magnitude and direction in the pre-rapid and rapid intensification (RI) stages. Examination of the high-resolution forecast data reveals that the tilt was large at the RI onset and decreased quickly once RI commenced, suggesting that vertical alignment is the result instead of the trigger for RI. The RI onset is associated with the development of upper-level warming in the eye center, which results from upper-level storm-relative flow advecting the subsidence warming in the upshear-left region towards the low-level storm center. This scenario does not occur until persistent convective bursts (CBs) are concentrated in the downshear-left quadrant. The temperature budget calculation indicates that horizontal advection plays an important role in the development of upper-level warming in the early RI stage. The upper-level warming associated with the asymmetric intensification process occurs by means of the cooperative interaction of the convective-scale subsidence, resulting from CBs in favored regions and the shear-induced mesoscale subsidence. When CBs are concentrated in the downshear-left and upshear-left quadrants, the subsidence warming is maximized upshear and then advected towards the low-level storm center by the storm-relative flow at the upper level. Subsequently, the surface pressure falls and RI occurs.
A copy of the presentation is available on the anonymous ftp site: