Slow, winding storms like Kajiki are even more dangerous.

Storm No. 5 before making landfall. Photo: EarthMaps .

Storm No. 5 moved at high speed over the sea, in a precise direction. However, when it reached the shore, it suddenly changed direction, moving very slowly. The center of the storm bombarded the mainland provinces of the Central region for many hours without any reduction in intensity, despite not being energized by the warm sea. This is not an unusual phenomenon in Vietnam. According to research, storms are "evolving" in this direction to cause more damage globally.

According to the 8am bulletin from the National Center for Hydro-Meteorological Forecasting, this morning the tropical depression weakened from storm No. 5 and moved deep into Central Laos. It is forecasted that in the next 12 hours, the tropical depression will continue to move in a West-Northwest direction, gradually weakening into a low pressure area and gradually dissipating.

The center also warned of heavy rain in the Northern Delta and midland areas, Son La, Lao Cai , Thanh Hoa and Nghe An; strong winds and high waves in the Gulf of Tonkin will continue.

Hurricanes are often described as “passing” through a given area. But in recent years, they have been taking a winding path, hovering for days at a time. This phenomenon is known as “storm stalling.”

Research published in the journal Nature shows that hurricanes around the world have slowed significantly over the past 65 years. This is accompanied by heavy rainfall and rising sea levels.

Specifically, hurricanes slowed down by an average of 10% between 1949 and 2016. The study cited a direct example of Hurricane Harvey, which caused catastrophic rains in Houston, USA when it “roamed” in the area for a long time.

According to ABC , a slow-moving, lingering storm means it lingers for longer, leading to more damage. The Weather gives notable figures on rainfall. "A storm moving at just 5 mph is capable of dropping up to 30 inches of rain. A storm moving at 20 mph typically produces much less rain at any given location. When this happens near mountainous terrain, rainfall totals can increase significantly," the site said.

Slow-moving storms can dump more rain on a given area, and they can also wreak havoc with their devastating winds, said Jim Kossin, a scientist with the National Oceanic and Atmospheric Administration and study author.

On the other hand, the slower a storm moves over the ocean, the more wind, water and energy it stores, expanding its potential for damage. “Every hazard that a tropical storm has, it’s going to last longer. That’s never a good thing,” Kossin said.

One of the factors affecting the speed of hurricanes is global warming. Climate change affects the general circulation at the atmospheric scale, where hurricanes hide and develop. In particular, the slowing of air circulation, due to the warming of the polar regions relative to the equator, also slows down hurricanes.

Source: https://znews.vn/bao-di-cham-quanh-co-nhu-kajiki-cang-nguy-hiem-post1580038.html