The Repository Hook Echo

Rolling Fork Tornado: What the Radar Saw in the Dark

October 18, 2026 · Runtime 15:12 · Watch on YouTube

On the night of 24 March 2023, a tornado crossed Rolling Fork, Mississippi, at 8:03 PM, 45 minutes after sunset. The final survey estimated its peak wind at 195 mph, and the Storm Prediction Center lists it as the strongest tornado of 2023 in the United States. The Weather Service radar at Brandon, 109 km away, scanned it every six minutes. We measured every scan ourselves: the radar saw debris in four of them. The tornado was on the ground for 71 minutes. FEMA drone footage shows Rolling Fork two days later.

Chapters

  1. 0:00 Rolling Fork, March 2023
  2. 0:41 The question
  3. 0:55 The track
  4. 1:35 A forecast day
  5. 2:14 After sunset
  6. 2:29 The radar 109 km away
  7. 3:24 The warning
  8. 4:19 8:03 PM, Rolling Fork
  9. 5:00 How radar sees debris
  10. 6:00 Our measurement
  11. 6:33 The town in the air
  12. 7:23 The air after dark
  13. 7:45 195 mph
  14. 8:56 Four scans
  15. 9:14 The signature collapses
  16. 9:34 Silver City
  17. 10:37 71 minutes, 24 seen
  18. 11:15 What the signature measures
  19. 11:59 The survey's record
  20. 12:56 The cost
  21. 13:36 The research instruments
  22. 14:13 What the record supports
  23. 14:46 Next: Camille, 1969

Transcript

Rolling Fork, March 2023 0:00

This is Rolling Fork, Mississippi, two days after the night of March 24th, 2023. The white cylinder on its side is the town's water tower. It was in service when the tornado reached it. The tornado reached it at three minutes past eight in the evening, forty-five minutes after sunset.

The final survey put its peak wind at a hundred and ninety-five miles an hour, and the Storm Prediction Center lists it as the strongest tornado of 2023 in the United States. Almost nobody could see it. But a radar sixty-eight miles away was scanning it every six minutes. And in four of those scans, the radar saw the town itself, in the air.

The question 0:41

So this episode asks a narrow question. In the dark, what did the instruments actually see of this tornado, and for how long? The answer turns out to be shorter than the tornado. A lot shorter.

The track 0:55

First, the map. The tornado began over northern Issaquena County, west of Rolling Fork, at seven fifty-seven in the evening, Central Daylight Time. It crossed Sharkey County, where Rolling Fork is, then Humphreys County and Silver City, and ended in the woods of Holmes County at nine oh eight. Fifty-nine miles, in seventy-one minutes.

The Weather Service statements that night tracked it moving northeast at about fifty miles an hour. Fifty-nine miles in seventy-one minutes is the same pace. At that speed, the tornado crossed a small town in a minute or two, and it crossed the open farmland of the Delta between them.

A forecast day 1:35

The day itself was not a surprise. That morning, the Storm Prediction Center put western and northern Mississippi under a moderate risk of severe storms, level four of five. It wrote that the most likely time for strong tornadoes was between five in the evening and midnight.

At five fifteen, the center issued Tornado Watch number seventy-six, until midnight. Sharkey County was inside it. The watch gave a ninety percent chance of two or more tornadoes in the area, and seventy percent of at least one rated EF2 or stronger. That was two hours and forty-eight minutes before the tornado reached Rolling Fork.

After sunset 2:14

Then the light went. The sun set over Rolling Fork at seven eighteen. Civil twilight, the last of the usable daylight, ended at seven forty-two. Fifteen minutes later, in the dark, the tornado touched down.

The radar 109 km away 2:29

This is the radar that watched it: the Weather Service radar at Brandon, near Jackson, call sign K D G X. Rolling Fork is about a hundred and nine kilometers to the northwest, sixty-eight miles. Every six minutes or so, the antenna swept the sky, starting with its lowest beam, half a degree above the horizon.

In a severe storm, that radar runs a scan pattern that goes back to the lowest beam in the middle of each volume, so the bottom of the storm is seen more often than the top. That is why some volumes from that night have two low scans, a few minutes apart. Each volume still takes about six minutes from start to finish.

At that distance, the curve of the Earth matters. The center of that lowest beam passed more than four thousand feet above Rolling Fork, and the beam itself was more than a mile wide. This radar was not looking at the ground. It was looking at whatever had been lifted off it.

The warning 3:24

The Jackson office was reading that radar live. At seven fifty-three, it issued a tornado warning for Sharkey and Humphreys counties. The source line said radar indicated rotation. And the warning projected the storm forward, with a time: Rolling Fork, around eight oh five.

A tornado warning is drawn as a shape on the map, laid along the storm's expected path. This one ran until nine o'clock and covered parts of two counties, Sharkey and Humphreys. Rolling Fork was inside it. So was Silver City, the next town the tornado would reach, about half an hour later.

At seven fifty-nine, the office updated it. A large and extremely dangerous tornado, eight miles west of Rolling Fork. The update added a phrase the Weather Service reserves for the worst cases: a particularly dangerous situation.

8:03 PM, Rolling Fork 4:19

The tornado was over Rolling Fork at eight oh three, two minutes ahead of the projection. At eight oh four, the office issued a tornado emergency for Rolling Fork and Anguilla, the strongest wording it has. It said the tornado was observed, and the damage threat catastrophic. The first warning had come ten minutes earlier.

Notice the word that changed. At seven fifty-three, the source was radar indicated: rotation the radar could see, with no confirmation that a tornado was on the ground. At eight oh four, the source was observed. Eleven minutes, in the dark, between a rotation on a screen and a confirmed tornado over a town.

How radar sees debris 5:00

Here is how a radar can know, at night, that a tornado has hit something. Since about 2013, every Weather Service radar sends two pulses, one horizontal, one vertical. Raindrops are nearly all the same shape, so the two echoes match, and a number called the correlation stays close to one.

Pieces of houses are every shape at once. Shingles, insulation, branches, sheet metal. The two echoes stop matching, and the correlation falls. When it drops below zero point eight inside a strong echo, right at the rotation, the radar is not looking at rain. It is looking at debris.

The radar also measures motion along its beam. Wind coming toward the radar is drawn in green, wind going away in red. When bright green sits right next to bright red, the air between them is turning. That pair is the rotation. The correlation says whether that rotation has picked anything up.

Our measurement 6:00

We pulled every scan from that night out of NOAA's public archive and measured it ourselves. In the lowest scan of each volume, we counted the points with correlation under zero point eight and an echo of at least forty decibels, within three kilometers of the debris nearest the survey line.

The scan that began at eight o'clock, three minutes after touchdown, shows the storm and the rotation. It shows no debris. The correlation near the tornado stays above zero point nine. In the scan that began at eight oh six, there it is.

The town in the air 6:33

Nineteen points of debris, centered over Rolling Fork. The lowest correlation in them is zero point five two. That is the town, lifted into the radar beam, three minutes after the tornado crossed it.

Forecasters at the Storm Prediction Center were reading the same scans. At eight thirteen they wrote that an intense tornado, EF3 or stronger, was likely ongoing, with rotation above seventy knots, and a well-defined debris signature up to thirteen thousand feet.

At eight oh five, while the emergency was in effect, the center also issued its regular evening update of the day's outlook. That update covers only the rest of the night, and it lowered the category over the region to enhanced, level three of five. By then the storms the morning forecast had described were already on the ground.

The air after dark 7:23

The same message measured the air the storm was feeding on. The radar's own wind profile showed a low-level helicity, a measure of the spin available to a storm, of about four hundred and thirty. Ninety-four minutes earlier, the center had quoted nearly two hundred, from the same radar. The spin in the lowest kilometer had roughly doubled after dark.

195 mph 7:45

On the ground, the strongest damage came as the tornado approached Highway 61, just north of Walnut Street. That is where the survey team found the damage that rated it EF4, a hundred and ninety-five miles an hour. In Sharkey County, the damage path was three quarters of a mile wide.

The water tower is one of the survey's markers. It stood east of Hicks Avenue, in service, and it fell to the southeast, perpendicular to the tornado's path. The roof came off the post office. The courthouse lost its cupola. The hospital was damaged on the outside.

The survey also recorded marks in the ground itself: scarring, and cycloidal marks, the looping scratches a tornado drags across open soil. A school bus was thrown into nearby trees. This is the evidence a survey reads. Not a measured wind, but what the wind did to objects of known strength.

East of Highway 61 there was a mobile home park. The survey says all thirty to thirty-five homes in it were destroyed, and six of the people who lived there died. Fourteen people died in Sharkey County.

Four scans 8:56

The scans kept coming, six minutes apart. Eight twelve: eight points of debris, northeast of town, on the line. Eight eighteen: twelve. Eight twenty-four: thirteen. Four scans in a row, the signature drifting northeast with the storm.

The signature collapses 9:14

Then, in the scan that began at eight thirty, the signature collapses. A speck or two of low correlation remain, and none of them passes our test. The tornado was still on the ground. The survey says so, field by field. It would stay on the ground for another thirty-eight minutes.

Silver City 9:34

At eight thirty-seven, the Jackson office issued a second tornado emergency, for Silver City, in Humphreys County. In the scan that began that same minute, our count shows a single point of debris. Three people died in Humphreys County. The survey rated the tornado there EF3, a hundred and sixty miles an hour.

Look at that scan. The storm is still there, and the tornado is still on the ground. The correlation near it reaches zero point six five at one point. One point is not a signature. By our test, the radar does not see Silver City in the air the way it saw Rolling Fork.

Eight forty-three: zero. Eight forty-eight: one. From eight fifty-four to the end of the track, at nine oh eight, the lowest scans near the survey line show only isolated specks, and none of them passes the test. The tornado crossed Holmes County, rated EF2, a hundred and fifteen miles an hour, and dissipated in the woods north of Randall Road.

71 minutes, 24 seen 10:37

So here is the measurement in one line. The tornado was on the ground for seventy-one minutes. The radar's debris signature, by our test, appeared in four scans, about twenty-four minutes of the night, from Rolling Fork to about fifteen miles northeast of it.

And the distance did not change. From touchdown to dissipation, the tornado stayed between about a hundred and a hundred and fourteen kilometers from the radar. The lowest beam was at nearly the same height over Silver City as over Rolling Fork. The geometry is the same. What changed was the tornado's strength, and what stood in its path.

What the signature measures 11:15

That does not mean the radar failed. It means the signature measures something else. It does not measure wind. It measures what the wind has thrown high enough to reach the beam, which at that distance ran thousands of feet above the ground. Over a town, that is a great deal. Over open fields and woods, at lower intensity, it can be almost nothing.

Compare Mayfield, Kentucky, in 2021, from an earlier episode. There, three radars saw debris in nearly every scan for almost three hours. That tornado crossed town after town, and the Paducah radar was about forty kilometers from Mayfield. Rolling Fork was more than a hundred.

The survey's record 11:59

Which is why the record of this tornado is not the radar's. It is the survey's. Weather Service teams surveyed the path in the days after, and rated each county by the damage they found. Ninety-five in Issaquena. A hundred and ninety-five in Sharkey. A hundred and sixty in Humphreys. A hundred and fifteen in Holmes.

Even that number moved. The preliminary statement, three days after the tornado, said a hundred and seventy miles an hour. The final record says a hundred and ninety-five. Both are EF4. The rating did not change. The estimate of the wind inside it did.

That is how the scale works. An EF rating is not a measured wind. It is an estimate read from damage, using the strongest buildings the tornado happened to hit. The upper bound depends on what was standing in the way.

The cost 12:56

Seventeen people died in this tornado: fourteen in Sharkey County and three in Humphreys. About a hundred and sixty-five were injured. One of the seventeen died nearly four weeks later. The Jackson office calls it the deadliest tornado since the Mississippi Delta outbreak of February 1971.

It was not the only tornado of that night. An EF3 tornado near Black Hawk, in Carroll County, killed three, and later another EF3 crossed Amory, in Monroe County, and killed two. Twenty-two people died in Mississippi that night. Seventeen of them in this one tornado.

The research instruments 13:36

There is one more set of instruments in this story. A research field project called PERiLS was in the field that day, with a mobile radar, instrumented cars, a lightning mapping array and weather balloons. Their storm was the Rolling Fork supercell. Their early analyses have been presented at scientific conferences.

As of now, we have not found a peer-reviewed paper on what those instruments measured inside this tornado. So this episode does not use their numbers. When it is published, it will add the one thing the Weather Service radar could not give. A look much closer to the ground.

What the record supports 14:13

Here is what the record supports. The forecast had the day. The watch came almost three hours ahead. The warning named the town and came ten minutes before the tornado. And the radar, a hundred kilometers away, saw the town itself in the air, for about twenty minutes.

But the line of the tornado, its length, its width and its strength, county by county, did not come from the radar. It came from people surveying the path afterward, in daylight, reading what the wind left behind.

Next: Camille, 1969 14:46

Next, a hurricane that the record books measured twice. In August 1969, Hurricane Camille hit the Mississippi coast. For forty-five years, the official record said a hundred and ninety miles an hour. A reanalysis in 2014 changed that number. That is the next episode. Camille, 1969: the hurricane measured twice.

Description and sources

The tornado began in Issaquena County at 7:57 PM CDT and ended in Holmes County at 9:08 PM, 59.35 miles, rated EF1, EF4, EF3 and EF2 county by county (95, 195, 160 and 115 mph). The Jackson office warned at 7:53 PM, naming Rolling Fork 'around 805 PM'; the tornado was over the town at 8:03 and a tornado emergency followed at 8:04. Our measurement of the KDGX radar (correlation below 0.8 inside echoes of 40 dBZ or more, within 3 km of the survey line) finds debris in the lowest scans of 8:06, 8:12, 8:18 and 8:24 PM (19, 8, 12 and 13 points), and almost nothing before or after, though the distance to the radar stayed between 100 and 114 km. The debris signature measures what is thrown into the beam, not the wind. Seventeen people died; NWS Jackson calls it the deadliest tornado since the Mississippi Delta outbreak of 21 February 1971.

PRIMARY SOURCES

Hook Echo reads a disaster through the instruments that recorded it: radar, sensor, survey and report, with the primary sources above.

About the material. Video: FEMA drone footage of Rolling Fork, Mississippi, 26 March 2023 (Joshua DuFrane, FEMA), released through DVIDS. Radar: NOAA NEXRAD Level II from KDGX, rendered by Hook Echo from the raw data. The debris counts are our own measurement of that public data. Every diagram is drawn in code from the sources listed. Nothing in this video is AI-generated imagery.

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