Formation mechanisms of heavy rainfall observed Niigata and Fukushima, middle Japan, on 28-30 July 2011-Comparison with the previous heavy rainfall events

摘要

Formation factors for the occurrence of heavy rainfall observed in Niigata and Fukushima,located on the Japan-Sea side of the Japan Islands,on 28-30 July 2012 are examined focusing on multiple precipitation systems causing the heavy rainfall,and atmospheric environmental conditions are compared with those in the previous heavy rainfall events:one is the Niigata heavy rainfall in August 1998 and the other is the Niigata-Fukushima heavy rainfall in July 2004.