This September, 1 typhoon occurred, the lowest record in statistical history. Tropical cyclone Kesa has occurred. Trend alert (weather forecaster Rika Fukutomi, September 29, 2023) – Japan Weather Association tenki.jp
This September, 1 typhoon occurred, the lowest record in statistical history. Tropical cyclone Kesa occurs. Be careful of trends.
September 29, 2023 12:23
The number of typhoons has been extremely low this September, with one typhoon occurring by yesterday, the 28th (Thursday) (compared to five in normal years). If it does not occur by tomorrow 30th, it is expected to be the lowest number in September since statistics began. Meanwhile, a new tropical cyclone has formed over the southern ocean. We need to pay attention to future trends.
This September, 1 typhoon occurs, breaking record for lowest number in statistical history
There were extremely few typhoons in September this year, and no new typhoons have occurred since Typhoon No. 13, which occurred on September 5th.
In a normal year, about 25 typhoons occur in a year, and by late September, about 18 typhoons occur, but this year there are still 13. In addition, the average number of occurrences in September is 5, but so far there has only been 1, which shows how low the number is this year.
Since statistics began in 1951, the lowest number of typhoons in September was two (1951, 1973, 1983). If no typhoon occurs by tomorrow, the 30th, it will be a new record for September with the least number of typhoons since statistics began.
A tropical cyclone forms over the southern seas.
At 3 a.m. today, the 29th (Friday), a “tropical cyclone,” which can be described as the egg of a typhoon, occurred over the southern ocean.
When a “tropical cyclone” develops further and the maximum wind speed reaches 17.2 m/s or more, it is called a “typhoon.” At this point, it is not yet clear whether it will become a typhoon, but there is a possibility that the front extending from Okinawa and Amami to the south of Honshu will become more active, so we need to pay close attention to future trends.
high sea surface temperature
In September, no typhoon has occurred for three weeks since Typhoon No. 13 disappeared on the 8th until today, the 29th. As a result, sea surface temperatures are as high as 30 degrees Celsius or more from the south of Japan to the sea east of the Philippines, and around 2 degrees Celsius above normal near Japan.
Generally, typhoons are said to occur in areas with sea surface temperatures of 26 to 27 degrees Celsius, but atmospheric conditions are also an important factor, and high sea surface temperatures alone do not lead to the occurrence and development of typhoons. However, if a new tropical cyclone or typhoon occurs, high sea surface temperatures are spreading that will encourage its development, so we will need to continue to monitor the situation.
By the way, in 2020, the number of typhoons until September was 13, the same as this year, but 10 typhoons occurred from October to December (6 in October, 3 in November, 3 in December). (1 per year), and the number of cases per year was 23, which is as much as 23 cases per year.
Be careful of typhoons in October too
The Japan Meteorological Agency gives names to typhoons that cause particularly large disasters, such as Toyamaru Typhoon and Isewan Typhoon. Ten typhoons have been named so far. Of these, nine hit in September, but Typhoon No. 19 of 2019 (East Japan Typhoon 2019) hit in October and caused severe damage in the Tokai region, Kanto region, and Tohoku region.
October is still typhoon season. The normal number of occurrences in October is 3.4, and the number approaching Japan is 1.7. Be sure to be fully prepared by checking hazard maps and cleaning gutters on a daily basis.
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2023-09-29 03:23:44
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