線状降水帯とは

-


線状降水帯とは（気象庁ホームページより）

次々と発生する発達した雨雲（積乱雲）が列をなし、組織化した積乱雲群によって、数時間にわたってほぼ同じ場所を通過または停滞することで作り出される、線状に伸びる長さ50～300km程度、幅20～50km程度の強い降水をともなう雨域を線状降水帯といいます。

毎年のように線状降水帯による顕著な大雨が発生し、数多くの甚大な災害が生じています。この線状降水帯による大雨が、災害発生の危険度の高まりにつながるものとして社会に浸透しつつあり、線状降水帯による大雨が発生している場合は、危機感を高めるためにそれを知らせてほしいという要望があります。

発生メカニズムに未解明な点も多く、今後も継続的な研究が必要不可欠です。


What is a Rainband? (Japan Meteorological Agency website)

A rainband refers to a linear area of rainfall accompanied by intense precipitation, typically stretching 50 to 300 kilometers in length and 20 to 50 kilometers in width. It is formed when successive developed rain clouds (cumulonimbus clouds) organize into a group, passing through or lingering over the same area for several hours.

Significant heavy rainfall events caused by rainbands occur almost every year, resulting in numerous severe disasters. Awareness of the increased risk of disasters associated with rainbands is gradually spreading in society, and there is a demand to inform the public when heavy rainfall occurs due to rainbands in order to enhance the sense of crisis.

There are still many aspects of the mechanism behind rainbands that remain unexplained, making continuous research essential for the future.

このブログの人気の投稿

No Prospect of Hurricane Dora Direct Hit on Hawaii

-
イメージ
Hurricane Dora Advisory Number 22 NWS National Hurricane Center Miami FL EP052023 1100 AM HST Sat Aug 05 2023  At 1100 AM HST (2100 UTC), the center of Hurricane Dora was located near latitude 13.3 North, longitude 134.8 West. Dora is moving toward the west near 18 mph (30 km/h), and this motion is expected to continue with some increase in forward speed during the next few days.  Maximum sustained winds have increased to near 130 mph (215 km/h) with higher gusts. Dora is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some additional strengthening is possible this afternoon and tonight. Dora is then expected to weaken beginning Sunday and continuing through Monday.  Dora remains a small hurricane. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 45 miles (75 km).
もっと読む

New Tropical Depression Forms, Expected to Become Typhoon No. 6

-
イメージ
While a large and extremely powerful Typhoon DOKSURI is moving northward towards the Chinese mainland, a tropical depression has formed over the eastern waters of the Philippines. The tropical depression is expected to develop into Typhoon No. 6 within the next 24 hours and continue its northward trajectory. Typhoon No. 6 is anticipated to approach Okinawa Main Island on Tuesday, August 1st, with a strong intensity. There is a possibility of Okinawa and Amami being significantly affected by destructive winds, high waves, heavy rainfall, and other associated impacts.
もっと読む

KHANUN: Direct Hit on Amami, Headed for Kyushu

-
イメージ
KHANUN is moving eastward over the East China Sea. As of 5:00 AM, the central pressure is 970 hPa, with maximum sustained winds near the center at 30 m/s and maximum gusts of 45 m/s. The southern parts of the Amami Islands and the Okinawa Main Island region are currently experiencing strong winds exceeding 25 m/s. Although the typhoon’s intensity has slightly weakened, it remains powerful, and there is a possibility of it intensifying again over the Pacific after directly impacting the Amami Islands on Sunday the 6th. Following that, it is expected to change its course to the north and make landfall in either Miyagi or Kagoshima Prefecture on Wednesday the 9th, traversing Kyushu. Due to the slow movement of the typhoon, the impacts such as heavy rain, strong winds, and high waves may persist for an extended period. [Announcement by the Japan Meteorological Agency on August 5, 2023, at 5:33 AM] In the Okinawa and Amami regions, please exercise extreme caution against strong winds, high
もっと読む