Attention to “one big wave” August 13th 18:39
I think many people go to the sea during the summer vacation, but there are many people who are swept away by the high waves during their leisure. Of particular note is the high waves that occur locally, such as “one big wave” and “earth wave”. It ’s a life-threatening “dangerous wave” that you ca n’t keep up with, even if you ’re far away from the typhoon.
What is a big wave that reaches twice the forecast?
Typhoon No. 10 going north of Japan.
Swells due to typhoons have already reached the coasts of western Japan and eastern Japan.
Actually, this happens once every 100 to 1000 times, and sometimes it becomes an unexpected high wave and hits the coast.
This phenomenon, which is often seen during summer and autumn when typhoons occur frequently, is called “one-shot big wave” or “house-use wave”, and it can even reach twice as much as the forecast of the Japan Meteorological Agency.
Feature 1 Dangerous even if it is thousands of kilometers away from the typhoon
According to the Japan Meteorological Agency, the big feature is that even if you are away from the typhoon, it will affect you.
The speed of typhoon swells is very high, and even if the typhoon is still on the south sea and the wind is still weak on the coast, the effects will start to appear first.
Also, if the swell lasts longer, it will be more likely to occur.
Feature 2 Rapidly high on the shallow coast
The other is that the swell rises rapidly on the shallow coast.
Even if it looks smooth offshore, the waves may suddenly rise near the coast.
“Dangerous waves” and dead people
Such high-frequency accidents occur every year.
In 2011, a large wave occurred on the Pacific side of Honshu due to Typhoon No. 12 in the Ogasawara Islands, and bathers were swept away by waves in Shizuoka and Ibaraki Prefectures and died.
Be careful after passing typhoon
With the approach of Typhoon No. 10 continuing northward, strict caution against high waves is necessary since 14th, mainly in western Japan, but the person in charge of the Japan Meteorological Agency said, “It ’s not a strange situation to have a“ big wave ”.
In addition, "One-shot big wave" needs attention after the typhoon passes.
This is because the swell may remain after the typhoon has passed.
In addition, new typhoons are likely to occur in the far south of Japan, and the Japan Meteorological Agency has called for “please pay close attention to the latest information when going out to the sea”.