is a non-fiction book written by Japanese author Kunio Yanagida and published in Japan in 1975. The book is about the Hiroshima Meteorological Observatory in 1945. Hiroshima was fully destroyed in the Atomic Bombing on August 6, 1945.

One month later, the phenomenal and powerful typhoon called Makurazaki Typhoon hit Hiroshima and resulted in 1,229 dead, 1,054 injured, and 783 missing in Hiroshima Prefecture. This book investigated what really happened there, why the Meteorological Observatory was ineffective. At that time, Hiroshima's administration systems were destroyed and was unable to inform the public about the typhoon. The survivors lost their houses from the bomb and were living in barracks or hospitals.

Contents Introduction – Enigma of the 2,000 deaths Chapter 1 – The Flash Chapter 2 – No Lack of the Observation Chapter 3 – The 17th of September, 1945 Chapter 4 – The Disaster of the Research Group on Atomic Bomb from Kyoto University Chapter 5 – The Black Rain Last chapter – The Record of the Sandglass

See also Hiroshima Meteorological Observatory Atomic Bombing of Hiroshima – August 6, 1945 Makurazaki Typhoon – September 17, 1945 one of the three largest Typhoons in Shōwa period 1229 dead, 1054 injured, 783 missing in Hiroshima Prefecture

External links A Blank in the Weather Map Makurazaki Typhoon Ebayama Museum of Meteorology