Twenty-five years after September 11, 2001, Meteorology Matters looks back at the extraordinary weather story unfolding alongside one of the darkest days in American history.

That morning, New York City sat beneath an unusually clear post-frontal sky while Hurricane Erin churned hundreds of miles offshore. After the World Trade Center attacks, satellite imagery captured something remarkable: the enormous circulation of Erin over the Atlantic and the smoke and dust plume streaming away from lower Manhattan in the same view.

This special episode reconstructs the meteorology of September 11th, Erin’s position and intensity, the atmospheric pattern that helped carry the plume southward, what NASA satellites and astronauts aboard the International Space Station observed, and how the unprecedented shutdown of U.S. airspace created a rare opportunity for scientists to study aircraft contrails and their possible effects on temperature.

We also examine how meteorologists and NOAA supported the response and recovery at Ground Zero through specialized forecasts, plume modeling, remote sensing and atmospheric monitoring.

The weather did not cause the events of September 11, but it shaped what millions of people saw, what satellites recorded, where smoke and debris traveled, and even the scientific questions that emerged in the days that followed.

A special 25th-anniversary episode of Meteorology Matters.

Keywords: September 11 weather, Hurricane Erin, 9/11 meteorology, World Trade Center smoke plume, NASA satellite imagery, Hurricane Erin 2001, 9/11 contrails, Meteorology Matters

Hashtags: #MeteorologyMatters #September11 #September11th #911Anniversary #HurricaneErin #WeatherHistory #Meteorology #Weather #NASA #HurricaneHistory

On Labor Day 1935, one of the most powerful hurricanes ever to strike the United States exploded into a Category 5 storm and slammed into the Florida Keys with estimated sustained winds of 185 mph and a central pressure of 892 mb, the lowest pressure assigned to a U.S. hurricane landfall.

But this disaster is about much more than the storm itself. Hundreds of World War I veterans were living in federal work camps along the Keys, and an evacuation train sent from Miami reached Islamorada just as catastrophic winds and storm surge arrived.

In this episode of Meteorology Matters, we reconstruct the extraordinary meteorology, the primitive forecasting network that struggled to locate the hurricane, Leonard Povey’s historic reconnaissance flight, the desperate rescue-train mission, survivor accounts, and the controversial aftermath that led Ernest Hemingway to ask, “Who Murdered the Vets?”

More than 400 people died, including roughly 250–260 World War I veterans. Nearly a century later, the disaster still raises a difficult question: how much responsibility does government have to protect vulnerable people when the forecast itself remains uncertain?

The seismic signal initially looked like an earthquake. It was the mountain itself collapsing.

On August 26, bedrock and glacier ice tore loose high above the Nepal–China border, transforming into a rock–ice avalanche, debris flow, and devastating flood. Meteorology Matters reconstructs that cascading disaster, explains why the evidence points away from a conventional glacial-lake outburst flood, and examines how retreating glaciers and warming mountain permafrost may have destabilized the slope without pretending science has identified one definitive trigger.

We follow the human toll, rescue and reconstruction efforts, continuing secondary hazards, and the flood of mislabeled, staged, and AI-generated videos that followed. Then we turn to a very different flash flood in the Grand Canyon to show why a locally catastrophic torrent can destroy critical infrastructure while doing almost nothing to relieve the Colorado River’s long-term water shortage. Two floods, two entirely different mechanisms, and one larger lesson: the condition of the landscape can be just as important as the event that sets a disaster in motion.