Typhoon season in Japan is typically from August to September, but typhoons have been known to hit in July and October as well. Typhoons in Japan are typically divided into five classifications that describe the scope of the area affected
Useful Japanese
Gokuchiisai very small (<200km) Kogata small (200-300km) Chuugata medium (300-500km) Oogata/Ookii large (500-800km) Chou-oogata/Hijyou ni Ookii very large (equal to or greater than 800km)
As for wind speeds, in Japan typhoons are categorised as Tsuyoi strong (32.7-43.7 m/s) Hijyou ni tsuyoi very strong(43.7-54.0 m/s) Mouretsu violent (>54.0 m/s) *m/s, meters per second
Oogata and chou-oogata typhoons can cover a radius of up to (and in some cases over) 800km, and will bring extremely strong winds and rain, and can result in flooding and landslides.
Preparing for a typhoon
Locate your nearest evacuation shelter or site
Determine possible escape routes
Prepare a survival kit (useful in event of any natural disaster)
Prepare enough food and water for around three days (necessary in the event of any natural disaster)
when a typhoon occurs
Stay inside
Listen to the radio of TV for information/updates
Close storm shutters if you have them. If not, cover your windows with plastic film or tape in the shape of an X
Secure outdoor objects or bring them inside
Turn off gas
Ensure that you have an adequate supply of water for sanitary purposes. Fill your bathtub and other large containers with water