High Impact Weather Associated with a Predecessor Rain Event Over Misawa Air Base.

摘要

Two significant rain events of greater than 100 mm 24 h-1 occurred over Japan in direct association with tropical moisture transport from Typhoon (TY) Roke in September 2011. The first event occurred over Misawa Air Base, Japan during 17-19 September 2011. Based on analysis of satellite imagery and numerical simulations, the Misawa rain event is classified as a predecessor rain event (PRE). A PRE is defined as a region of heavy rainfall that occurs thousands of kilometers poleward of a tropical cyclone (TC). The second rain event occurred over Nagasaki on 18 September 2011 and does not meet the requirements for PRE classification. The Department of Defense (DoD) TC warning process focuses on TC induced sustained high winds and their proximity to landfall. This analysis shows the link between the Misawa PRE and Roke via the poleward transport of deep tropical moisture. Because excessive rainfall is considered a destructive force associated with TCs, it is the purpose of this thesis that the U.S. Navy's tropical cyclone conditions of readiness (TCCOR) procedures reflect PRE conditions in order to raise awareness within all meteorology communities amongst the DoD in efforts to minimize risks to DoD installations and personnel.