From midday of 7/13/2012, radiation level spiked up all around in Japan. Western Japan had the peak of radiation level sooner than Eastern Japan. The wind blew from South-West on that day.
↓ Radiation level from South-West to North-East
Tokushima
Kagawa
Ehime
Kochi
Fukuoka
Saga
Nagasaki
Kumamoto
Ohita
Osaka
Hyogo
Kyoto
Shiga
Shimane
Hiroshima
Yamaguchi
Niigata
Ishikawa
Fukui
Gifu
Tokyo
Kanagawa
Gunma
Yamanashi
Nagano
Akita
Iori Mochizuki