This Date in Weather History

The 1943 Surprise hurricane was the first hurricane to be entered by a reconnaissance aircraft. The first tracked tropical cyclone of the 1943 Atlantic hurricane season, this system developed as a tropical storm while situated over the northeastern Gulf of Mexico on July 25. The storm gradually strengthened while tracking westward and reached hurricane status late on July 26. Early on July 27, it became a Category 2 hurricane on the modern-day Saffir-Simpson scale and peaked with winds of 105 mph. Because the storm occurred during World War II, information and reports were censored by the US government and news media. Advisories also had to be cleared through the Weather Bureau office in New Orleans, resulting in late releases. This in turn delayed preparations ahead of the storm. In Louisiana, the storm produced gusty winds and heavy rains, though no damage occurred. The storm was considered, at the time, the worst in Texas since the 1915 Galveston Hurricane. Wind gusts reach 132 mph in the Galveston-Houston area, buildings and houses were damaged or destroyed. The storm caused 19 fatalities. Overall, damage reached approximately $17 million. This was the first hurricane to be intentionally flown into by a reconnaissance aircraft. During the morning hours of July 27, British pilots were training at Bryan Field in Bryan, Texas and were alerted about a hurricane approaching the Galveston area. Upon becoming informed that the planes would need to be flown away from the storm, they criticized this policy. Instead, US Colonel Joe Duckworth made a bet with the British pilots that he could fly his AT-6 Texan trainer directly into the storm. Duckworth requested that Lt. Colonel Ralph O'Hair, the only navigator at the field, fly into the hurricane with him. Because neither Duckworth nor O'Hair believed that the headquarters would approve the flight, they decided to proceed without permission. Thus, Duckworth and O'Hair became the first hurricane hunters, on July 27, 1943. Their impact of their flight would pave the way for today’s Hurricane hunters. According to AccuWeather.com "Hurricane hunter pilots risk their lives as they obtain information that is critical in determining the intensity of a tropical system by directly sampling the storm. The data that they collect, including radar information, wind speed, temperature, pressure, etc. are instrumental in the forecasting process.”  

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The Boston Globe reported on July 26, 1890 that "At first the trees swayed a little and the grain bent down on the hills. Then shingles flew off from old roofs and the orchards sent down their unripe fruit. After about 30 seconds of an avalanche of wind broke and came tearing down upon the tenement houses and workshops and stores with the force of a Niagara. Big elms and maples that were planted with care away back in the days of the Salem witches, bowed their graceful tops to the streets, and snapped off near the roots as if they had been of chalk. Fences were lifted from trimly kept gardens and taken away to the estate of neighbors, 200 yards distant, and outhouses fell like grain before the reaper.” On July 26, 1890, what was described as a tornado or cyclone swept down upon South Lawrence, Massachusetts. This event can be described in today's terms as a brief tornado or a powerful microburst, which is a sudden downdraft of air over a small geographic area. The Lawrence tornado, called the “Great Cyclone,” struck South Lawrence at 9:10 to 9:15 AM on Saturday, July 26, 1890. It took about two minutes to pass through any point. Damages were estimated at about $60,000. Eight people were killed and 65 were injured.

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As Stockholm and Andrea Doria were approaching each other head-on in the heavily used shipping corridor on the night of July 25, 1956, the westbound Andrea Doria had been traveling in heavy fog for hours. The captain had reduced speed slightly had activated the ship's fog warning whistle and had closed the watertight doors. However, the eastbound Stockholm had yet to enter what was apparently the edge of a fog bank, and was seemingly unaware of it and the movement of the other ship hidden within the fog. The waters of the North Atlantic south off Nantucket Island are frequently the site of intermittent fog, as the cold Labrador Current encounters the Gulf Stream. As the two ships approached each other at a combined speed of 40 knots, in failing light, each was aware of the presence of another ship, but guided only by radar, they apparently misinterpreted each other's course. No radio communication was made between the two ships at first. In the last moments before impact, Stockholm turned hard to starboard and was in the process of reversing her propellers, attempting to stop. Andrea Doria, remaining at her cruising speed of almost 22 knots engaged in a hard turn to port , her captain hoping to outrun the collision. Around 11:10 p.m., the two ships did collide, Stockholm striking the side of Andrea Doria. When Andrea Doria and Stockholm collided at almost a 90° angle, Stockholm's sharply raked ice breaking prow pierced Andrea Doria's starboard side about one-third of her length from the bow. It penetrated the hull to a depth of nearly 40 feet. Below the waterline, five fuel tanks on Andrea Doria's starboard side were torn open, and they filled with thousands of tons of seawater. Meanwhile, air was trapped in the five empty tanks on the port side, causing them to float more readily, contributing to a severe list. On the Andrea Doria, the decision to abandon ship was made within 30 minutes of impact. In the first hours after the collusion, many survivors transported by lifeboats from both ships were taken aboard Stockholm. Unlike the Titanic tragedy 44 years earlier, several other nonpassenger ships that heard Andrea Doria's SOS signal steamed as fast as they could, some eventually making it to the scene. In all, 1,663 passengers and crew had been rescued from Andrea Doria. The great ship sank 12 hours after the collusion; 52 killed by impact or drowned during rescue attempts. The collusion would most likely never have occurred if not for the dense fog back that the Andrea Doria, one of the largest ocean liners of the day had not been steaming through.

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The European continent is not free from tornado events. While in the USA, some 1,200 tornadoes could be observed annually, on the European continent only 300 events every year are recorded. Europe experiences less frequent events than USA, but storms can be really devastating. Storms occur when warm humid air near the surface lay under drier air aloft with temperatures decreasing rapidly with height, providing energy for the storms through the production of instability. Large changes in wind with height or ‘‘wind shear’’ over both shallow and deep layers—combined with the instability and high humidity near the surface—create a situation favorable for tornadoes to form. Midwestern American areas are an incredible basin that in summer fills with hot air and humidity, provided by the Gulf of Mexico; the drier air comes from Canada, providing energy for the storms through the production of instability. In Europe the northeast of Italy is often the place in which cold air coming from the Alps encounter warm and humid air coming from the Adriatic Sea and Africa, and cause widespread severe thunderstorms across the plains of northern Italy. On July 24, 1930 the vicinity of Montello in the Po river valley of northeastern Italy, just south of the southern foot of the Alps was hit by the strongest tornado in Europe on record. The tornado maxed out on the Fujita scale at F5 rating, producing extreme damage – even destroying strong masonry like churches. The area was devastated with more than 20 fatalities and whole villages wiped off the map.

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On July 23, 1788 after causing ship disasters southeast of Bermuda, a hurricane moved northwestward over the tidewater area of Virginia, and right over George Washington's Mt. Vernon Plantation. At Ocracoke Inlet, southwest of Cape Hatteras, 6 ships were wrecked and 11 were driven ashore with 2 dismasted. As the storm center passed just to the east of this point, the wind shifted. This caught ships unaware and added to the disaster. An account from Norfolk stated that: "at 3am the wind suddenly shifted from northeast to south and blew a perfect hurricane - tearing up large trees by the roots, removing houses, throwing down chimney, fences, and laying the greatest part of the corn level." The following day on July 24th, George Washington wrote in his diary: "about noon the wind suddenly shifted from northeast to southwest and blew the remaining part of the day violently from that quarter. The tide this time rose higher than it was ever known to do, driving boats, etc. into fields where no tide had ever been heard of before, and must, it is apprehended, have done infinite damage on their wharves at Alexandria, Norfolk, Baltimore, etc. At home all day." It would take more than a year to repair the damage to those ports.

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On Christopher Columbus' third voyage after leaving the Cape Verde Islands, his 4 ships drifted WSW in the equatorial current. A ship’s account from July 22, 1498 states that "The wind stopped so suddenly the heat was so excessive and immoderate that there was no one who dared to go below after the casks of wine and water which burst, snapping the hoops of the pes; the wheat burned like fire; the bacon and salted meat roasted and putrefied." This calm area known to sailors around the world as the doldrums, is a belt around the Earth extending approximately five degrees north and south of the equator. Here, the prevailing trade winds of the northern hemisphere blow to the southwest and collide with the southern hemisphere’s driving northeast trade winds. Due to intense solar heating near the equator, the warm, moist air is forced up into the atmosphere like a hot air balloon. The rising air mass finally subsides in what is known as the horse latitudes, where the air moves downward toward Earth’s surface and the is often little surface wind in this region. That is why sailors well know that the area can becalm sailing ships for weeks. Columbus was caught in the doldrums or horse latitudes. The term horse latitudes came later, after Columbus, when ships sailing to the western hemisphere were sometimes stranded for weeks and as they baked, sailors reportedly pushed the horses they were transporting overboard to keep from running out of scarce water. Occasionally the ships were stranded and for longer periods and became ghost ships as entire crews perished, from heat and lack of food and water.

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On July 21, 1861, a hot and dry summer Sunday, Union and Confederate troops clashed outside Manassas, Virginia, in the first major engagement of the Civil War, the First Battle of Bull Run. Union General McDowell hoped to march his men across a small stream called Bull Run in the vicinity of Manassas, Va. that was well-guarded by a force of Confederates under General Beauregard. McDowell needed to find a way across the stream and through the Southern line that stretched for over six miles along the banks of Bull Run. McDowell launched a small diversionary attack at the Stone Bridge while marching the bulk of his force north around the Confederates’ left flank. The march was slow, but McDowell’s army crossed the stream easily because the weather leading up the the battle had been dry and the stream was running at a low level. Some of Beauregard’s troops, recognizing that the attack at Stone Bridge was just a diversion, fell back just in time to meet McDowell’s oncoming force. The battle raged for several hours on top of Henry Hill, with each side taking control of the hill more than once. Slowly, more and more Southern men poured onto the field to support the Confederate defense, and Beauregard’s men pushed the Northerners back. At this point in the battle, Confederate General Barnard Bee attempted to rally his weary men by pointing to Brigadier General Thomas Jackson who stood his ground in the face of the Union assault. Bee cried, “There stands Jackson like a stone wall!” From that moment on, Thomas Jackson was known as “Stonewall” Jackson. As the day wore on, the strength of McDowell’s troops was sapped by the continuous arrival of fresh Southern reinforcements and the intense heat of the summer day with temperatures in the 90s and Union troops in heavy wool uniforms. Eventually, the Northerners began to retreat across Bull Run. The Union pullout began as an orderly movement. However, when the bridge over Cub Run was destroyed, cutting off the major route of retreat, it degenerated into a rout. The narrow roads and fords, clogged by the many carts, wagons, and buggies full of people who had driven out from Washington, D.C., to see the spectacle, hampered the withdrawal of the Union Army. The heat had done in the Union tr

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On July 20, 1977 a flash flood devastated Johnstown, Pennsylvania, killing 84 people and causing millions of dollars in damages. This flood happened 88 years after the Horrible Flood of 1889 that was one of the worst weather-related disasters in US history that killed more than 2,000 people. Johnstown sits in a deep valley, hard against the Conemaugh river. In that earlier flood, the dams in the Conemaugh Valley failed, bringing disaster to Johnstown and as fate would have it the combination of the weather and those human made dams would once again bring catastrophe. The flood occurred when an extraordinary amount of rain came down in the Conemaugh Valley in a short period of time. Nearly 12 inches were measured in 10 hours. The National Weather Service later estimated that this amount of rain in that location should happen less than once every 1,000 years. Dams started bursting upstream from Johnstown. The largest dam that burst was at Laurel Run. This 10-year-old earthen dam held back 100 million gallons of water. Despite having a 42-foot-high spillway, the dam failed and the resulting flood devastated the town of Tanneryville. Five other dams in the area also burst, releasing another 30 million gallons of water. The failure of the dams was a shock. Johnstown had constructed an entire system designed to completely eliminate the flood risk after the devasting flood of 1889 and a destructive flood in 1936. Many safely measures were in place along with inspections. Still, the dams were no match for the thunderstorm that stalled over the area on July 20. In addition to the 84 people who lost their lives to the flood, $300 million or more than $1.2 Billion in 2021 dollars in damages were suffered and hundreds of people lost their homes. President Carter declared the region a federal disaster area and the National Guard was sent to assist in the relief efforts. Despite millions spent to rehabilitate the Johnstown area, the economy never recovered. The city’s population decreased nearly 15 percent in the aftermath of the flood, as people moved away.

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Over the course of a three-month period in the summer of 1993, a slow-moving and historic flooding disaster unfolded across the midwestern United States, leaving economic ramifications that would be felt for years to come. Over 17 million acres were flooded across nine states across the Midwest during the summer of 1993, starting in June and lasting through August. This is an area larger than the entire state of West Virginia. “The magnitude and severity of this flood event was simply overwhelming, and it ranks as one of the greatest natural disasters ever to hit the United States,” said Lee Larson, chief at the Hydrologic Research Laboratory. This long-duration river flooding caused hundreds of levees failures, 50 fatalities and an estimated $15 billion in damages. While the worst of the flooding occurred in the summer of 1993, impacts across the region lasted for years. Of the 17 million acres that were flooded, a majority was being used as farmland. This had a long-term impact on the industry as some of the land was not able to be used again for farming for several years after flood waters had receded. Shipping and transportation industries were also severely impacted during the height of the flooding. Barge traffic on the Missouri and Mississippi rivers was stopped for nearly two months. The inability for ships and barges to navigate the waters of these major waterways resulted in an economic loss of $2 million per day, according to the National Weather Service. High water also rendered some bridges that spanned across the Mississippi River unusable for weeks, disrupting travel across the region. In some cases, this meant taking a detour of over 100 miles just to make it to the other side of a flooded river. The historic flooding was not caused by one single rainfall event, but rather an extended period of above-normal rainfall across the same region. The stage was set in 1992 with a wet fall which resulted in above-normal soil moisture and reservoir levels in the Missouri and Upper Mississippi river basins. The wet autumn was followed by above-average snowfall during the winter. When all of this snow melted in the spring, it left the ground across the region saturated and prone to flooding. The focus of the flooding on July 19, 1993 was St Louis Mo, where the Mississippi river rose to 46.8 feet at were flood stage is only 30'. It was the high-water mark in St Louis and flooding extended from the Gateway Arch to the suburbs.

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Late in the evening of Friday, July 17, 1942 heavy rain began falling in southern New York. The weather system producing the heavy rain and thunderstorms intensified and moved into Pennsylvania. The storm stalled out over Smethport and Port Allegany PA, on Saturday, July 18th. Most of the rain, incredibly feel in just a 5-hour period. People living in the region reported in the local press after the storm that the electrical storm was the worst they had ever witnessed. Water quickly began to accumulate and rise rapidly, many thought that they would drown. In the Austin, PA, many people were quoted as saying that “the rain did not come down in drops, it came down in streams.” The dam at the Williamson Pulp and Paper Company at Austin was breached and immediately flooded the town of Austin. There were reports of massive quantities of gravel and rock being washed down small gullies and even reports of bedrock being ripped out and carried downstream as the relentless rain continued. In Emporium, Pennsylvania, the estimated rainfall rate was more than 10 inches per hour. There was massive flooding over a short period of time. There were many accounts of an “almost instantaneous rise” in the water from 5 to 8 or 10 feet. Buildings in Austin were being knocked off their foundations and the water was 4 to 5 feet deep on the main street. The heaviest rain fell in Smethport, Pennsylvania. Some locations received an incredible 34.50 inches of rain from the event. A rainfall total of 30.7 inches of rain in a 4 1/2-hour period set a world record at Smethport.

Monday, July 19 

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