This Date in Weather History

Natchez, Mississippi was a bustling and booming river town hard against the Mississippi River in 1840, it was 20 years after Mississippi joined the union and 20 years before the Civil War. But on May 7, 1840 the second deadliest tornado in U S history struck the city. A large and powerful tornado went right through the center of town, flattening most of the buildings. But even worse was the damage on the Mississippi River, which was filled with boats, including 120 flatboats and steamboats carrying people and goods along the main transport system in the part of the nation – the Mississippi River. The powerful tornado wrecked many boats at the Natchez Landing in Mississippi as well and then plowed through the city. The tornado killed 317 people and injured 109 others. The only storm on record this destructive to kill more than it injured. Many bodies were never found. The storm is still as of May 7, 2021, the second deadliest tornado on record. The actual death toll could be higher as enslaved persons were not counted.

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The airship Hindenburg, the largest dirigible ever built and the pride of Nazi Germany, bursts into flames upon touching its mooring mast in Lakehurst, New Jersey, killing 36 passengers and crewmembers on May 6, 1937. After opening its 1937 season by completing a single round-trip passage to, Brazil, in late March, the Hindenburg departed from, Germany, on the evening of May 3, on the first of 10 planned round trips between Europe and the United States that were scheduled for its second year of commercial service. Except for strong headwinds that slowed its progress, the Atlantic crossing of the Hindenburg was otherwise uneventful. Although carrying only half its full capacity of passengers and crew for the flight, the Hindenburg was fully booked for its return flight. The airship was hours behind schedule when it passed over Boston on the morning of May 6, and its landing at Lakehurst was expected to be further delayed because of afternoon thunderstorms. Advised of the poor weather conditions at Lakehurst, the Captain charted a course over New York City, causing a public spectacle as people rushed out into the street to catch sight of the airship. After finally being notified at 6:22 p.m. that the storms had passed, the airship headed back to Lakehurst to make its landing almost half a day late. At the time of the disaster, sabotage was commonly put forward as the cause of the fire, but in order to make up for the delay of more than 12 hours in its transatlantic flight, the Hindenburg passed through thunderstorms with high humidity and high electrical charge. Although the mooring lines were not wet when they first hit the ground and ignition took place four minutes after, it was theorized that the lines may have become wet in these four minutes. When the ropes, which were connected to the frame, became wet, they would have grounded the frame but not the skin. This would have caused a sudden potential difference between skin and frame and would have set off an electrical discharge – a spark. Seeking the quickest way to ground, the spark would have jumped from the skin onto the metal framework, igniting the leaking hydrogen, causing the explosion.

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The office of the Town Clerk is the repository for the maintenance and safekeeping of records for the Town of Ashford, Conn. The Town reports that housed in the fire-proof vault in the office of the Town Clerk are all land records, Town Meeting minutes, Town Ordinances, birth/marriage/civil union/death records, land surveys, election records, trade names, liquor permits, contracts, town reports, veterans discharge filings, Town board/commission/agency agendas and minutes, listings of Notaries Public, Justices of the Peace, election records, and other historical documents. Just about everything and anything you can think of. In addition to maintaining records, the Town Clerk’s Office is the place to go for absentee ballots, copies of vital records, dog licenses, marriage licenses, voter registration forms. The Town of Ashford is not unique to New England, for centuries the Town Clerks at these hamlets great and small have dutifully recorded, not just those official papers I reported on, but other significant events. They have told the story of America, it so happens that on May 5, 1761, Ebenser Byles, Town Clerk of Ashford reported that 5" of snow fell and that it was, and I quote from his official record "A very stormy day of snow, an awful sight, the trees green and the ground white. The trees in a blow and the fields covered with snow"

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The neighborhood of Germantown in Philadelphia sits at a higher elevation than most of the rest of the city. From 250-300 feet above sea level the temperature can average a degree or two colder than the city below. During weather situations that are borderline between rain and snow, often times much of the City of Philadelphia will have a slushy mixture of rain and snow, while only wet snow falls in Germantown and its adjacent elevated neighborhood of Chestnut Hill; sometimes depositing a couple inches of snow. On May 4, 1774 Germantown was a not part of the City of Philadelphia yet, it was a prosperous town of hundreds living in long established stone houses. Germantown was founded in 1683 and awaited its fate as the location of one of the most important battles of the Revolutionary War in 1777. But on May 4, 1774 as a strong storm surged up the Atlantic seaboard, temperatures held just near freezing, and while rain fell in the City of Philadelphia below 4” of heavy wet snow blanketed Germantown in one of the latest snowfalls on record in the region, before or since.

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Most of New Orleans, Louisiana is below the flowing water level of the Mississippi River, that also means that the city is below sea level and so both the Gulf of Mexico and Lake Pontchartrain surfaces are also above the ground level of the city. Because of that, the city does not have a natural drainage for rainwater, so pumps are required to remove rainwater from the region. On May 3, 1979 the pumping drainage system had been in operation since 1900. That system was designed to handle one inch of rain per hour for the first three hours, and one-half inch per hour thereafter. Any rainfall in excess of this limit resulted in drainage slowdown and flooding, often times during extensive thunderstorm cloudbursts or tropical systems and Hurricanes the capacity to pump out the water simply was not effective. May 3, 1978 was proclaimed 'Sun Day.' All across the United States, celebrations were planned to pay tribute to the power and potential of solar energy. No celebration occurred in New Orleans, the sun was not visible all day, in fact heavy rains fell most of the day. Almost 11” of rain fell, more and 8” of that from 8am until noon. It was more than the drainage system could handle, actually more than twice its capacity. There was severe property damage, as much of the city sat in more than 5 feet of water as a result of the heavy rains and the failure of the pumping system.

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Twelve people were hospitalized Saturday May 2, 2009 after the roof of the Dallas Cowboys' indoor practice facility in Frisco, Texas collapsed during a thunderstorm. The giant blue star atop the building lay crumpled on the ground. The storm knocked out power at team headquarters and splintered trees across the property. The roof was a large air- and tension-supported canopy with aluminum frames covering a regulation 100-yard football field. Approximately 70 players, coaches, staff and media were reported inside. Some of the injuries were serious, but none were considered life-threatening. Based on the national standards for determining loads and for designing structural steel buildings, the Commerce Department's National Institute of Standards and Technology researchers studying the Cowboys facility found that the May 2 wind load demands on the building's framework—a series of identical, rib-like steel frames supporting a tensioned fabric covering—were greater than the capacity of the frame to resist those loads. The researchers determined that, at the time of collapse, the wind was blowing predominantly from west to east, perpendicular to the long side of the building. Maximum wind speed gusts at the time of collapse were estimated to be in the range of 55 to 65 miles per hour—well below the design wind speed of 90 miles per hour in the national standard for wind loads. The NIST report recommended building owners, operators and designers inspect all fabric-covered, steel-frame structures, evaluating them to ensure they are designed to handle appropriate wind loads.

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The winter of 1853-1854 had been a particularly snowy one across the mountains of Vermont and New Hampshire. Not record breaking, but it was a cold winter and the snows that fell during the winter months didn’t melt much. The cold lingered into April and so did the snow on the ground. The weather pattern broke as the month ended, winds in the high atmosphere turned from the northwest to out of the south and ushered in warm air that had been building across the Gulf states in the early spring. At the same time copious volumes of moisture were carried along in the current of air from the Gulf of Mexico and the result was an unceasing rain that developed all across New England. Along with a soaking rain and soaring temperatures cloudbursts imbedded in thunderstorms brought hour after hour of rain. By the time the rain ended on May 1, 1854 it had been raining for 90 consecutive hours. Rainfall totaled more than 5” in Worchester, Mass and more than 7 ½ inches in Southwick, Mass, a general 3-5” rainfall fell from Philadelphia all the way to Maine. The rain coupled with the warm snow melting temperatures produced record flooding all across New England. The greatest crest on the Connecticut River was at Hartford where the river reached almost 29’ above flood stage.

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The Huang He (Wang He) or Yellow River is one of the longest rivers in China, at 3,398 miles, it loops northward from the mountains in western China, then flows east, each year bringing 1.6 billion tons of fine-grained silt from the mountains to the huge flat basin of the north China plains. That rich laden dirt and silt makes the region one of the most fertile in the world, it is China’s breadbasket. The silt nourishes and replenishes the land. The Yellow River gets its name from its rich, fine-ground, golden mud. Unfortunately for the farmers, the only way the river can spread its fertilization is by flooding the fields; and the Yellow River has flooded a recorded 1,593 times in the last four thousand years, with catastrophic effects. The worst flooding occurred in 1887. For decades leading up to 1887 dikes and embankments had been built along the river to control its flooding and provide irrigation for crops. In some places, because of those levees, the river was flowing more than 20 feet higher than the surrounding countryside – a breech in the system was all that was needed for disaster. An usually snowy winter and a wet mild spring led to massive snowmelt in the mountains and heavy rains contributed more water. On April 30, 1887 the first of several massive floods erupted as the river could no longer be contained. Flooding continued off and on all summer. The flooding led to the greatest weather disaster in human history. More than 900,000 perished in the initial rounds of flooding close to the river with another estimated 1.3 million drowned from flooding away from the river as the floodwaters spread out all across northern China. A further estimated three to four million died from flood-related, waterborne diseases, with a thick deposit of muddy silt 8 ft deep, the most fertile fields in China were a desert which had to be cleared by bare hands and wheelbarrows.

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On April 22, 1991 an area of tropical thunderstorms began to organize in the Bay of Bengal it would grow to become one of the deadliest tropical cyclones ever recorded. The storm hit, one of the most populated areas in Bangladesh. An estimated 200,000 people were killed by the storm, as many as 10 million people lost their homes, and overall property damage was in the billions of dollars. Once the weather system organized it began moving north. By April 24 the storm was designated Tropical Storm 02B, and by April 28 it was a tropical cyclone, or as they are known in the western hemisphere, a hurricane. One day later on April 29 the storm hit, with winds of up to 150 miles per hour. The damage was immediate, as a storm surge as high as 15 feet engulfed the flat, coastal plans of southeastern Bangladesh. The surge washed away entire villages and swamped farms, destroying crops and spreading fears of widespread hunger as well as economic woes. As a result of a storm in 1970, a few storm shelters had been built, but they were not enough. Though in 1991 some were saved by the shelters, many people had doubted warnings of the storm. Since the 1991 storm, the Bangladesh government has built thousands of elevated shelters in coastal areas.

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1992: A hailstone begins as a water droplet that is swept up by an updraft inside of a thundercloud. Inside the cloud, there are a large number of other supercooled water droplets already present. These supercooled particles will adhere to the water droplet’s surface, forming layers of ice around it. The size the hailstone reaches depends on the amount of time it spends surrounded by supercooled water droplets, but eventually gravity causes the stone to fall to the Earth. As gravity takes over, they will fall to Earth at approximately 106 miles per hour. The exact velocity each stone falls at will vary depending on several conditions, such as weight, air friction and collisions with other suspended objects. The evening of April 28, 1992, brought with it one of the most devastating hailstorms of all time, pummeling two areas approximately 100 miles apart. For nearly five hours, residents between Waco to Fort Worth braced as hailstones the size of grapefruits 4.5 in. diameter smashed windows and decimated roofs. The worst damage was reported across Ellis, Dallas, and Tarrant counties. More than 600 pets and wild animals were killed. Damage was estimated at $750Million or almost $1.5Billion in 2020 dollars.

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