For information on HWRF documentation, please see the following Scientific Documentation:

Tallapragada, V., L. Bernardet., M. K. Biswas, S. Gopalakrishnan, Y. Kwon, Q. Liu, T. Marchok, D. Sheinin, M. Tong, S. Trahan, R. Tuleya, R. Yablonsky, X. Zhang, 2014: Hurricane Weather Research and Forecasting (HWRF) Model: 2014 Scientific Documentation. NCAR Development Tested Bed Center Report. [ PDF]

Besides, Development Testbed Center (DTC) has more information on the WRF for Hurricanes model.

HWRF v12.0.0 planned upgrades [PDF]