Typhoon No. 19 Strictly alert to storm surges
Typhoon No. 19 requires strict caution not only for storms and heavy rains, but also for the "storm surge" that overlaps with the time of the tide.
High tide with sucking and blowing
The sea level rises 1 cm when the central pressure of the typhoon falls 1 hectopascal.
When a typhoon approaches the coastal area, the sea surface is sucked up, and a large amount of seawater is blown by the strong offshore wind, which may cause a “storm surge”, which is extremely dangerous.
Highest tide level + spring tide = strict alert
This season, from summer to autumn, the sea temperature rises and expands, with the highest tide level of the year.
Furthermore, from the 12th to 13th when the typhoon approaches eastern Japan, the storm surge coincides with the height of the storm surge, so strict caution is required.
What is the high tide time in each region?
The high tide times at the main points in Kanto and Tokai.
▽ Tokyo Port 12th 4:31 pm 13th 4:29 am ▽ Tateyama City, Chiba 12th 4:15 pm 13th 4:21 am ▽ Katsuura City, Chiba 12th 3:59 pm 13th 4: 2am ▽ Okada on Izu Oshima 12th 4:11 pm 13th 4:12 am ▽ Odawara City, Kanagawa Prefecture 12th 4:15 pm 13th 4:16 am ▽ Shimoda City, Shizuoka Prefecture 12th 4:42 pm 13:44 am ▽ Shimizu Port, Shizuoka Prefecture 12:56 pm 13: 5 pm 13 pm Nagoya Port 12: 5 pm 27:13 am 5:29 am
High tide + high waves = Tokyo Bay ...
Risks are further increased by high waves coming to the place where the tide level rises due to storm surges.
Last month's Typhoon No. 15 caused damage such as a large amount of seawater flowing into an industrial park in Kanazawa-ku, Yokohama, facing Tokyo Bay, and vehicles being washed away.
The Ministry of Land, Infrastructure, Transport and Tourism says that even in this typhoon No. 19, there is a risk of flooding caused by storm surges and high waves in Tokyo Bay.
Storm surge = difficult to flow in the river Increased risk of flooding
Storm surges not only cause damage such as inundation along the coast, but also raise the water level near the river mouth, making it difficult for the river water to flow, increasing the risk of flooding.
Keep away from dangerous places while the typhoon is approaching.
Risk of damage even at low tide
Since Typhoon No. 19 approaches with a very strong force, there is a risk of damage from storm surges even if it does not overlap with the time of high tide.
At the press conference on the 11th, Mr. Koji Sugawara, Director of the Meteorological Agency, said, “When a typhoon approaches and a very strong wind blows, Strict vigilance is necessary because there is a risk of a rise, ”he said.