Despite remaining safely offshore, Hurricane Simon unleashed its fury on Mexico’s Pacific coast, battering the region with powerful, destructive winds and widespread flooding. Even as coastal communities braced for the impacts of the massive tropical system, NASA satellites stationed high above the planet captured an extraordinary and rarely seen scientific spectacle: enormous, rippling waves propagating through Earth’s upper atmosphere, triggered directly by the violence of the storm below.
Hurricane Simon represents the latest chapter in an exceptionally active 2026 hurricane season that has repeatedly swept across the Eastern Pacific basin. On October 11, 2026, the storm reached Category 4 intensity as it tracked on a dangerous north-northwest trajectory, bringing it perilously close to the Mexican coastline. At its height, the hurricane’s sustained winds whipped around its core at a ferocious 250 kilometers (155 miles) per hour, making it a formidable weather system capable of catastrophic damage should it veer inland.
Hurricane Simon Batters Mexico’s Pacific Coast
As the storm progressed along its path, the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA’s Suomi NPP satellite captured a striking, high-resolution image of the massive cyclone at approximately 2:30 p.m. local time, corresponding to 20:30 Universal Time on October 11. At that exact moment, Simon’s well-defined eye was positioned roughly 50 kilometers (30 miles) offshore, churning menacingly between the bustling coastal cities of Manzanillo and Puerto Vallarta.
Data provided by the National Hurricane Center (NHC) indicated that sustained winds had slightly decreased to approximately 210 kilometers (130 miles) per hour by the time the satellite imagery was acquired. Nevertheless, despite this slight reduction in peak wind speeds, the hurricane’s fierce inner core remained dangerously close to land, posing an immediate and severe threat to coastal municipalities, local infrastructure, and residents living in low-lying areas.
Fortunately, the rugged geography of the region played a significant role in mitigating the storm’s full potential. The towering peaks of the Sierra Madre mountain range interacted with the circulation of the hurricane, helping to limit Simon’s overall strength. This imposing terrain acted as a physical barrier that reduced the storm’s intensity and effectively shrank the geographical radius impacted by its most destructive winds.
Even with the moderating influence of the mountains, the storm delivered a punishing blow. Simon unleashed torrential rainfall that quickly overwhelmed drainage systems, leading to severe coastal flooding in population centers such as the major port city of Manzanillo. Furthermore, according to contemporaneous news reports, the relentless downpours substantially escalated the threat of dangerous, fast-moving mudslides throughout the heavily saturated mountainous regions of western Mexico, prompting local authorities to urge extreme caution and enact emergency preparations.
NASA Captures Strange Waves Above the Hurricane
While the visible surface of the ocean churned in turmoil and coastal communities contended with rising waters, instruments in orbit detected an entirely different phenomenon unfolding far above the cloud tops.
During the early morning hours of October 11, the sheer convective power of the hurricane generated massive rippling disturbances that broke away from the storm system and surged upward into Earth’s upper atmosphere. A specialized nighttime satellite image, acquired by the VIIRS instrument aboard the NOAA-21 satellite, revealed intricate bands of atmospheric gravity waves spreading outward in concentric patterns from the center of the hurricane.
These complex atmospheric waves are born from intense thermodynamic activity deep within the tropical cyclone. In the immediate vicinity of the hurricane’s eyewall, the massive release of latent heat acts as an invisible engine, fueling powerful convection. This process forces vast quantities of warm, moist air to surge upward at incredible speeds, rapidly developing towering cumulonimbus clouds that pierce the troposphere.
The tremendous updrafts functioning inside these towering cloud structures violently disturb the surrounding air masses. This mechanical and thermal disruption generates waves that propagate vertically, traveling upward through the stratosphere and eventually reaching the mesosphere. Unlike traditional ocean waves, which move through liquid water, atmospheric gravity waves are oscillations of air parcels where buoyancy and gravity act as the primary restoring forces, pushing displaced air back toward equilibrium.
Why the Rare Atmospheric Ripples Were Visible
Although intense hurricanes frequently generate atmospheric gravity waves during their peak development phases, capturing them with orbital instruments remains a rare occurrence. Under typical conditions, turbulent winds and shearing forces at high altitudes can disrupt, weaken, or completely disperse these delicate disturbances long before they reach the mesosphere. It is only when these waves penetrate high enough that they can sometimes be rendered visible through a natural optical phenomenon known as airglow.
Airglow is a faint, persistent luminescence produced by chemical reactions among gases high in Earth’s upper atmosphere. When atmospheric gravity waves ascend into this glowing atmospheric layer, they induce subtle, localized variations in atmospheric density and temperature. These variations create visible ripples in the faint light, revealing the hidden wave patterns to sensitive spaceborne sensors.
The day-night band of the VIIRS instrument possesses the extreme sensitivity required to detect this elusive, faint upper-atmospheric light. However, this high sensitivity comes with a scientific challenge: the sensor also collects moonlight reflected off Earth’s surface and scattered through the atmosphere. This ambient lunar illumination can easily wash out or obscure the much weaker signals of airglow, rendering the ripple patterns virtually invisible to observers in space.
Fortunately, environmental and astronomical conditions aligned in a uniquely favorable manner when the satellite passed over Hurricane Simon. With minimal illumination from the Moon casting light across the night side of the planet, the delicate atmospheric ripples stood out with exceptional clarity against the dark backdrop of space, enabling the satellite to record the striking phenomenon in unprecedented detail.
Hurricane Simon’s Unpredictable Path Raises Concerns
By the morning of October 13, meteorological agencies and forecasters found themselves grappling with high levels of uncertainty regarding the future track and intensity of the storm. Predicting Simon’s next move proved exceptionally difficult as the system continued to defy standard forecasting models.
In official statements, the National Hurricane Center characterized its confidence in both the intensity and track forecasts as "very low confidence." This unusual assessment underscored how Simon had consistently behaved in ways that challenged conventional meteorological expectations, leaving forecasters with a wide array of possible scenarios.
At the time, one prominent trajectory model suggested that the storm might eventually make a northward turn, potentially pushing into the confined waters of the Gulf of California before ultimately making landfall on the Mexican mainland.
Regardless of whether the storm struck land directly or maintained an offshore trajectory, its immense size meant that large, powerful ocean swells would continue to radiate outward. These heavy swells were expected to generate hazardous surf conditions, dangerous rip currents, and coastal erosion along substantial portions of Mexico’s southwestern and west-central coastlines over the days following the initial encounter.
NASA Earth Observatory images by Michala Garrison, using VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, the Suomi National Polar-orbiting Partnership, and the Joint Polar Satellite System.
