An enormous mysterious angel ring arrives in the Kansai area

According to the story from the reader, the Ministry of Land, Infrastructure and Transport 's JMA' s page "Analytical rainfall · precipitation short time forecastI found out that a huge angel ring has come down to the Kansai area. What on earth happened?

The image at that time is from the following.
This is at 17 o'clock on August 4http://www.jma.go.jp/jp/radame/It was taken. Obviously it looks like it is raining in the form of a ring


And this is still still visible Image of August 4 17 o'clock


By the way it was not visible from the page as soon as it was 18 o'clock, so it is raining or the system is strange ......