People use umbrellas to protect themselves from the rain

A tropical storm that never crossed a shoreline has killed at least one person, displaced more than 58,000 people across two countries, severed power to tens of thousands of families, and destroyed over 10,000 hectares (about 24,700 acres) of crops — all by doing something forecasters found nearly impossible to predict: stopping. Floods and landslides swept across northern Vietnam and China's Guangxi region as Narra dumped record rainfall without making landfall.

Tropical Storm Narra, Vietnam's fourth named storm of 2026, stalled over the Gulf of Tonkin beginning the evening of August 21, reversing direction, drifting, and at points barely moving at all. By the early hours of August 24, the National Center for Hydro-Meteorological Forecasting (NCHMF) in Hanoi placed the storm's center over waters northeast of Bach Long Vi — roughly 140 km (87 miles) east-southeast of Quang Ninh and 145 km (90 miles) east of Hai Phong — with maximum sustained winds of 88 km/h (55 mph) and gusts reaching 103 to 117 km/h (64 to 73 mph). In the preceding three to six hours, it had moved just 3 km/h (about 1.9 mph).

The storm's violence was not in its winds. It was in its rain, and the reason the rain was so catastrophic comes down to a scientific principle that has become increasingly urgent in the climate era: when a tropical cyclone stops moving forward, it parks its precipitation machine over the same ground for days.

Why a Stalled Storm Is the Deadliest Kind

A tropical cyclone travels by riding large-scale atmospheric steering currents — upper-level winds and synoptic pressure systems that push the storm the way a current pushes a cork. When those steering winds weaken or collapse into a confused balance between competing pressure systems, the storm loses forward propulsion. It can meander, reverse direction, and stall. Research by NOAA's National Centers for Environmental Information confirmed that tropical cyclones globally have slowed by 10 percent since 1949, increasing the frequency and severity of such stalling events.

The consequence is straightforward physics. Total rainfall accumulation over a given location is approximately inversely proportional to the storm's forward speed: a system moving at 3 km/h (1.9 mph) deposits roughly ten times more rain on any spot it passes over than the identical storm moving at 30 km/h (18.6 mph). The longer the stall, the deeper the saturation — and the greater the risk of rivers overflowing, slopes collapsing, and drainage systems failing. Hall and Kossin's research established that stalling storms produce significantly more rainfall than those that keep moving.

Nguyen Van Huong, head of the Weather Forecasting Department at Vietnam's NCHMF, noted that modeling systems struggled to agree on Narra's trajectory throughout the event, describing the storm's behavior as highly abnormal. The repeatedly reversed direction and extended near-stationary position made prediction exceptionally difficult for forecasters.

What makes Narra's behavior scientifically notable — and alarming for Vietnam's future — is that such highly abnormal behavior may be becoming less rare. Research published in Nature in 2018 by James Kossin of NOAA's National Centers for Environmental Information documented a roughly 10% global slowdown in tropical cyclone translation speeds between 1949 and 2016. A follow-up study by Timothy Hall of NASA's Goddard Institute for Space Studies and Kossin, published in npj Climate and Atmospheric Science in 2019, found that North Atlantic tropical cyclones are increasingly likely to stall near coastlines, driven both by slower forward motion and by more frequent abrupt changes of direction — both of which Narra displayed.

The suspected driver is Arctic amplification: as global temperatures rise, the Arctic is warming faster than the tropics, weakening the pole-to-equator temperature gradient that powers the planetary wave patterns responsible for steering tropical cyclones. "There is some evidence that those large-scale wind patterns are slowing down in the tropics," Hall told NASA's research communications team. "The storms are not being pushed as hard by the current that moves them along. That's a climate change signal."

A study published in Nature Communications in March 2026 — the most recent addition to this literature — modeled global stalled tropical cyclones under climate warming scenarios and found that while warming slightly reduces the global probability of TC stalling, it significantly increases the daily rainfall from stalled storms, particularly over land and nearshore regions, heightening flood risk globally. The underlying mechanism applies equally to the western Pacific: the same weakening steering flows affect storm behavior across basins.

Rainfall Records Shattered Across Vietnam's Northeast

The numbers coming out of northern Vietnam's provincial monitoring stations make the stalling mechanism concrete. From 7 p.m. on August 21 through 4 a.m. on August 24 — a roughly 57-hour window — the broader northeastern region and Thanh Hoa province received 100 to 200 mm (3.9 to 7.9 inches) of accumulated rainfall. In the harder-hit provinces of Lang Son, Quang Ninh, Bac Ninh, and Hai Phong, totals reached 180 to 380 mm (7.1 to 15.0 inches), with some sites recording more than 400 mm (15.7 inches) in that span.

Individual station records were historic. Hong Ha in Quang Ninh logged 547 mm (21.5 inches); Mau Son in Lang Son recorded 520 mm (20.5 inches); Cat Ba in Hai Phong registered 413 mm (16.3 inches). To calibrate those numbers: New York City's annual average rainfall is approximately 1,270 mm (50 inches). These stations absorbed more than a third of that total in under three days.

Vietnam's mountainous provinces of Lang Son and Cao Bang received between 236 mm (9.3 inches) and 300 mm (11.8 inches) in the single 24-hour period ending Monday morning. That concentration of rainfall directly triggered cascading floods and landslides that swept through communities across the northeast.

"The main issue is rainfall flooding, which is the number one hurricane hazard in terms of mortality risk," Hall noted in research communications. Narra's death toll — currently one confirmed fatality in Vietnam, with the storm still active as of August 24 — reflects exactly that pattern: it was rain, not wind, that claimed the single confirmed life.

One Death, Thousands Displaced, Crops Gone

The confirmed fatality is a 27-year-old man living in Thai Binh Commune, Lang Son Province, killed when a landslide buried his home, according to the Vietnam Disaster and Dyke Management Authority under the Ministry of Agriculture and Environment.

Across Lang Son, strong winds and rain damaged or tore the roofs off 205 houses while floodwaters inundated 2,506 more homes. In Trang Dinh Commune, photographs released by Lang Son police showed residential streets entirely submerged, with rooftops barely visible above the waterline. Rivers in the province rose above Flood Warning Level 3 — Vietnam's highest flood alert threshold — prompting evacuations of riverside communities.

In Thanh Hoa Province, approximately 50 cubic meters of rock and debris collapsed onto a national highway, cutting traffic and forcing 35 households to relocate. More than 7,900 hectares (19,500 acres) of crops were inundated or damaged across Lang Son, Bac Ninh, and Quang Ninh alone. The cumulative crop figure across all affected areas exceeds 10,000 hectares (24,700 acres), a significant blow to farming communities still recovering from the catastrophic 2025 storm season.

Power connections to nearly 55,000 families were severed across affected provinces. The Department of Irrigation Works Management and Construction reported that northern reservoirs remained structurally sound, with no dam incidents recorded, and that authorities maintained round-the-clock duty arrangements with emergency equipment pre-positioned for rapid response.

Ha Long Bay: UNESCO Heritage Site Disrupted

The storm also reached Quang Ninh province, home to Ha Long Bay — a UNESCO World Heritage Site and one of Vietnam's most economically significant tourism destinations. Flooding inundated Quang Ninh city, disrupting tourism operations, fishing activity, and transport links. The extent of damage to tourism infrastructure had not been fully assessed as of August 24.

Ha Long Bay's vulnerability to typhoon-driven flooding has historically been compounded by the fact that storms affecting Quang Ninh often approach from the Gulf of Tonkin directly — the same body of water where Narra stalled.

What Does a Stalled Storm Look Like to Forecasters?

The Gulf of Tonkin sits in a semi-enclosed basin flanked by Vietnam's northern coastline to the west and China's Guangdong and Guangxi coasts to the north and east. In August, synoptic-scale steering in the northwestern Pacific can fragment when the subtropical ridge — the high-pressure belt that normally drives typhoons in a predictable westward arc — weakens or becomes spatially variable. When that happens, a storm positioned inside the gulf has no strong steering signal to follow.

Narra appears to have been caught in exactly this environment. After forming as a tropical depression that rapidly intensified into a named storm the evening of August 21, the system earned its reputation for confounding forecasters almost immediately. Rather than following a conventional coastal approach or open-ocean arc, Narra repeatedly reversed direction and stalled — a combination the American Meteorological Society's 2024 Journal of Applied Meteorology and Climatology identifies as the defining characteristic of genuinely stalling systems: track contained within a circular area of radius 200 km (124 miles) or less for 72 or more hours.

That confined, oscillating track pattern is also among the hardest behaviors for numerical weather prediction models to capture. Models excel at representing the large-scale steering flow but can fail to resolve the subtle balance between weak, competing pressure systems that determines whether a storm stalls, turns, or resumes normal tracking. The Gulf of Tonkin's enclosed geometry, combined with August's climatologically variable steering environment, made Narra a worst-case scenario for forecast accuracy.

What Is Narra Forecast to Do Next?

According to NCHMF projections, Narra is expected to maintain its position over the eastern Gulf of Tonkin through approximately August 25, sustaining winds near 88 km/h (55 mph) before gradually turning northeast at 3 to 5 km/h (1.9 to 3.1 mph). By August 26, the storm is projected to be roughly 240 km (149 miles) northeast of Bach Long Vi.

Thereafter, forecasters anticipate Narra will turn northwest, accelerate to 5 to 10 km/h (3.1 to 6.2 mph), and make landfall in southern Guangxi, China, before weakening into a tropical depression. Torrential rains are forecast for Guangxi, Guangdong, Hainan, and Fujian provinces through at least midweek.

Rain across northern Vietnam was forecast to begin easing from Monday night Vietnam time as the storm's circulation shifts away from the Gulf, though forecasters warned that with already-saturated ground and rivers still running well above normal levels, even modest additional rainfall could sustain flood conditions for days afterward.

Regional Spillover: 54,000 Relocated in Guangxi

Narra's outer circulation extended far beyond Vietnam's borders. China's Guangxi Zhuang Autonomous Region bore the storm's northern edge, prompting authorities to relocate approximately 54,000 people — including more than 8,000 moved into emergency shelters — according to state broadcaster CCTV.

Water levels at monitoring stations along 15 rivers across Guangxi exceeded official warning thresholds. Video distributed by CCTV showed brown floodwaters engulfing road networks and low-rise residential buildings in Chongzuo, with rescue workers wading through knee-deep flows and evacuating stranded residents by boat. The combined displacement figure across both Vietnam and China — more than 58,000 people relocated or displaced — underscores how a single stationary system in an enclosed sea can generate disaster on a binational scale.

Vietnam's Storm Season in Context — and a Warning About What Comes Next

The 2025 Pacific typhoon season left deep scars on Vietnam's north and center: multiple storms struck in rapid succession between September and December, producing what Vietnamese media called the Great Flood of 2025, a catastrophe that killed or left missing more than 300 people and caused billions of dollars in damage. Narra arriving as the fourth named storm of 2026 by August 21 — and causing this scale of destruction while stalling offshore rather than making landfall — has renewed attention on the adequacy of early-warning dissemination and rural mountainous infrastructure in an era of increasingly erratic storm behavior.

The science points in an uncomfortable direction. If tropical cyclone translation speeds continue the downward trend documented by Kossin and Hall, and if rainfall from stalling events intensifies as Arctic amplification weakens steering winds, Vietnam's exposure to the specific type of destruction Narra delivered — extended heavy rainfall, saturated slopes, riverine flooding, agricultural devastation, all from a storm that never crossed the coast — will increase. The wind-speed metrics and landfall counts that traditionally anchor storm severity assessments tell only part of the story. The stall is the story.

Vietnamese authorities have urged coastal and maritime operators to track the storm's movements, restrict vessels from venturing into dangerous waters, and keep search-and-rescue teams on standby. For the tens of thousands of families whose homes, crops, and livelihoods sit in Narra's wake, recovery is the immediate priority — from a storm that never arrived, and couldn't leave.

Frequently Asked Questions

What caused Narra to stall over the Gulf of Tonkin rather than making landfall?

Tropical cyclones move by riding large-scale atmospheric steering currents — high- and low-pressure systems that push the storm the way wind pushes a cork in a stream. When those steering winds weaken or become disorganized across competing pressure cells, a storm loses forward propulsion and can drift, reverse direction, or stop almost entirely. The Gulf of Tonkin's semi-enclosed geography and August's variable steering environment appear to have combined to produce exactly that condition for Narra, leaving it nearly stationary over open water for days. Research by NOAA's National Centers for Environmental Information confirms this is the established mechanism for tropical cyclone stalling.

Why did a storm that never hit land cause worse flooding than one that makes landfall?

Landfall matters for wind damage, storm surge, and the structural destruction typically associated with a hurricane or typhoon. But rainfall flooding — the deadliest hazard in terms of mortality — is primarily a function of how long a storm's precipitation-generating circulation sits above a given location. A fast-moving system passes and its rainfall moves with it; a stalled system dumps rain onto the same terrain continuously for days. Research by NOAA's James Kossin and NASA's Timothy Hall, published by NASA's GISS, has established that rainfall flooding is the number one mortality hazard from tropical cyclones, and stalling storms deliver it in concentrated, extended doses that overwhelm drainage and saturate slopes long before wind damage begins.

Are stalling tropical cyclones becoming more common, and is climate change responsible?

The evidence is growing that both are true. Kossin's 2018 Nature study found a roughly 10% global slowdown in tropical cyclone translation speeds over the second half of the 20th century. Hall and Kossin's 2019 npj Climate and Atmospheric Science research documented an increasing tendency for North Atlantic storms to stall near coastlines, tied both to slower forward motion and to more frequent abrupt direction changes. The suspected mechanism is Arctic amplification — the Arctic is warming faster than the tropics, weakening the temperature gradient that powers the planetary wave patterns that steer tropical cyclones. A 2026 Nature Communications study found that climate warming increases rainfall from stalled storms significantly, particularly over land and nearshore regions globally. Whether that signal is equally strong in the western Pacific specifically remains an active area of research.

Is Ha Long Bay, a UNESCO World Heritage Site, at heightened risk from this type of storm behavior?

Ha Long Bay sits in Quang Ninh province in northeastern Vietnam — directly on the Gulf of Tonkin, the same body of water where Narra stalled. The bay's geography makes it structurally exposed to storms that form or linger offshore: heavy rain falls on and around the limestone karst seascape without the usual dissipation that comes when a storm moves inland. Narra's outer circulation flooded parts of Quang Ninh city, disrupting tourism, fishing, and transport, though the full extent of damage to the bay area remained under assessment as of August 24. Stalling events that park precipitation over the Gulf are likely to remain a recurring threat as long as the atmospheric conditions that produce them persist.

Originally published on Tech Times