The likely U.S. Military Target would be Joint Base Pearl Harbor Hickam.   Due to the nearly flat terrain and ocean (except for Red Hill and Salt Lake).  The Supersonic Blast Wave would travel from Point of Detonation and still get to Honolulu, most buildings will fall, it maybe weeks to months to attempt to dig out survivors.  High levels of Alpha and Beta Radiation will slow Rescues down (Protective Equipment), many will have already ingested or breathed and have Radiation Sickness.   In this case Red Hill not block nor deflect the Supersonic Blast Wave from reaching Aiea and upper Pearl City, might even reach Waipio, will destroy Waipahu, Ewa Beach, Kaimuki might not be destroyed.   The Firestorm will burn down almost everything on the Leeward Coast, and maybe reach Central Oahu, as fed by the vegetation of the Forest Reserves.  The rise in elevation at Wahiawa will deflect the Supersonic Blast Wave from hitting "North Shore's" Waialua and Haleiwa.