Japan Meteorological Agency gave out another caution that Japan to face unstable air condition which could lead another tornades through May 10.
On May 6, 2012, two tornades brought the catastrphic damages to Tsukuba, Ibaraki and Tochigi Pref, killing a 14-year-old student and damaged over 1,000 buildings.
The tornaedes were caused when cold air from syberia met the warm air over Japan.
JMA said that -21 C of cold air from Syberia are appoaching over Japan though May 10 again which would lead the similar condition where the ground tempreture is over 20 C.
The 40 C difference could lead very unstable air condition.
Therefore, there are higher chances of tornades, thunder, hailing thoughout Japan through May 9 and 10.
If you noticed that sky gets darkended very quickly, and started feeling the strong wind and hearing noise, there maybe high chance of tornades.
Try to run into the concrete building. Stay away from the glass windows. The tornade wind may pass through the building. Stay away from the pathway between window(s) to another window(s).