5 Record-Breaking Extreme Weather Events in the U.S.
As a rule, bringing weather up in conversation is considered boring. Most of us in the U.S. infrequently experience truly extreme weather: Even when suffering through intense storms, heat waves, or bitter cold, our discomfort isn’t usually offset by bragging rights. That’s because most weather records are made in far-off locations. But there are a few truly astonishing exceptions where records were set closer to home.
1. MARYLAND: THE MOST RAIN EVER RECORDED IN ONE MINUTE
Just about every summer features a thunderstorm with what seems like the heaviest rain you’ve ever seen. Dark skies give way to a downpour that falls so fast that it’s hard to see more than a few feet down the road. But not even the heaviest rain you’ve ever seen can come close to the inundation in Unionville, Maryland, on July 4, 1956.
On that day, a gauge in this western Maryland town recorded 1.23 inches of rain in just one minute. That kind of sudden deluge is almost unimaginable, but scientists studied the gauge and found it to be in fine working order between 3:23 p.m. and 3:24 p.m. on that hot, humid afternoon. It’s even more impressive that the thunderstorm that produced this record rainfall wasn’t part of a tropical storm or hurricane—it appears to have been an everyday summer storm.
2. KANSAS: THE FARTHEST TORNADO-TOSSED DEBRIS
A destructive tornado can tear apart a home in an instant. When extreme winds rip apart a building, the debris scatters, sometimes for miles, usually never to be found by its original owner again. Every once in a while, though, far-flung wreckage can be traced back to where it originated.
Such was the case in Stockton, Kansas, on April 11, 1991, after an F3 tornado tore through the town, damaging and destroying several homes in the rural community. After the storm passed through, someone found a personal check from Stockton all the way in Winnetoon, Nebraska—an astounding 223 miles away.
Lightweight debris—things like leaves, insulation, and personal checks—frequently get lofted high enough into a thunderstorm that they get caught in strong upper-level winds, traveling dozens (if not hundreds) of miles downwind. But we usually don’t see tornado debris travel quite that far—nor are we usually able to pinpoint its origin with such ease.
3. OKLAHOMA: THE LONGEST LIGHTNING BOLT
The World Meteorological Organization recently certified two shocking lightning records for the history books: the longest lightning bolt and longest duration lightning bolt ever recorded. There are hundreds of recording stations all over the globe to measure where lightning strikes, and meteorologists can use the data from these stations to tell how long the lightning flash lasted and how long the bolt itself stretched.
Scientists used data from seven such recording stations to find that a 199.5-mile-long lightning bolt lit up the sky over Oklahoma on June 20, 2007, stretching from east to west across more than half of the large, flat state. That’s officially the longest lightning bolt ever recorded—a brand-new record that’s waiting to be broken by another enterprising storm in the future.
A few years later, the longest-duration lightning bolt ever recorded flickered in the sky over southern France on August 30, 2012. Most lightning only lasts for a fraction of a second, but this particular flash stretched nearly 100 miles across the southern Alps near Marseille, lasting for an astonishing 7.74 seconds.
4. SOUTH DAKOTA (#1): THE FASTEST COLD SNAP
How appropriate: The fastest temperature drop ever officially recorded plummeted the mercury in Rapid City, South Dakota on January 10, 1911. Life on the Plains can be rough during the winter. The flat land allows warm air to surge from the south one day but frigid air to dip from the north the next, resulting in wild temperature swings that happen frequently during the cooler months of the year.
That’s what happened in 1911. Dr. Walter Lyons records in The Handy Weather Answer Book that the official weather station in Rapid City measured a temperature of 55°F at 7:00 a.m. on January 10, just minutes before an intense cold front plowed through the tiny town. Fifteen minutes later, the temperature fell to just 8°F—representing a historic 47°F drop in the outside air temperature in the same time it takes to boil a pot of pasta. More than 30 years later, in 1943, the nearby town of Spearfish would set a related record, for fastest temperature increase: 49°F in just two minutes.
5. SOUTH DAKOTA (#2): THE BIGGEST HAILSTONE
Another winner for the Mount Rushmore State. Any chunk of ice hurtling toward the ground is too large when you’re worried about your car, home, or crops. But some thunderstorms are able to grow so strong they create hailstones larger than baseballs—and a handful of thunderstorms produce chunks of ice large enough to leave craters in the ground.
The largest hailstone ever recorded fell in Vivian, South Dakota, on the afternoon of July 23, 2010. The hailstone was nearly the size of a volleyball, measuring 8 inches in diameter and weighing almost 2 pounds. Meteorologists estimate that updraft winds—the unstable air shooting up into the storm—had to have blown 160–180 mph to sustain the weight of such a massive hailstone.