Ironically, however, around one o'clock in the afternoon on that day, dark clouds lowered on Mt. Atago (Kyoto City) and overwhelmed Heiankyo along with a thunderstorm -- About an hour and a half later, a thunderbolt struck the first pillar at the southwest corner of the Seiryoden.
ところが、午後1時頃より愛宕山(京都市)上空から黒雲が垂れ込めて平安京を覆いつくして雷雨が降り注ぎ、それから凡そ1時間半後に清涼殿の南西の第一柱に落雷が直撃した。