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1878 Atlantic hurricane season

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Of the known 1878 cyclones, both the third and fourth systems were first documented in 1995 by meteorologists José Fernández-Partagás and Henry F. Díaz, who also proposed large changes to the known tracks of the second, seventh, and eighth storms. Further analysis in the early 21st century by the Atlantic hurricane reanalysis project extended the duration of the third system by one day and identified major track changes for the fifth system. However, climate researcher Michael Chenoweth authored a reanalysis study, published in 2014, which concluded that the 1878 season featured a total of seventeen tropical cyclones, with the addition of five undocumented or previously excluded systems from the official hurricane database (HURDAT). Chenoweth also proposed some alterations to the track and intensity of each existing storm. However, these changes have yet to be incorporated into HURDAT.

Seasonal activity began by July 1, when stormy conditions associated with the first system started to impact Florida. All three known cyclones in August intensified into hurricanes and impacted land. Another three systems formed in September and each of them also strengthened into a hurricane. The last of the three, the seventh overall, became the most intense cyclone of the season, peaking as a Category 4 hurricane on the present-day Saffir–Simpson scale. Prior to this, the storm struck Haiti, leading to an unknown number of deaths when a brigantine capsized. Earlier in September, the fifth cyclone inflicted more than $919,000 (1878 USD) throughout its path and killed at least 60 people, with the dead rumored in the hundreds across the Caribbean, particularly in Haiti. In mid-October, the season's eighth storm drowned 27 people offshore New England. Later that month, the eleventh cyclone, the Gale of 1878, rendered substantial storm surge and wind damage throughout the Eastern United States, with 71 deaths and more than $2.46 million in damage. A record-tying five hurricanes existed in the month of October. The twelfth and final known system, which drowned three people in Puerto Rico, was last noted south of Jamaica on December 2.

Season summary

The Atlantic hurricane database (HURDAT) recognizes twelve tropical cyclones for 1878 in the Atlantic basin, the highest number in a single season until 1887 and tied with 1886 and 1893 for the second-highest in the latter half of the 19th century. Ten storms attained hurricane status, with winds of 74 mph (118 km/h) or greater, while two of those intensified into major hurricane. The seventh hurricane peaked as a Category 4 hurricane on the present-day Saffir–Simpson scale with maximum sustained winds up to 140 mph (220 km/h) and a minimum atmospheric pressure of 938 mbar (27.7 inHg), making it a major hurricane. Meteorologists José Fernández-Partagás and Henry F. Diaz first documented the third and fourth cyclones in 1995, while also significantly modifying the tracks of the second, seven, and eighth storms. In the early 21st century, Atlantic hurricane reanalysis project extended the duration of the third system by one day and implemented a major adjustment to the fifth system's track based on a study by Cuban meteorologist Ramón Pérez Suárez. However, a 2014 study by climate researcher Michael Chenoweth recommended the addition of five new cyclones and some alterations to the track and intensity of each existing storm. Chenoweth's study utilizes a more extensive collection of newspapers and ship logs, as well as late 19th century weather maps for the first time, in comparison to previous reanalysis projects. However, Chenoweth's proposals have yet to be incorporated into HURDAT.

Seasonal activity began by July 1, the day when Florida began reporting stormy conditions associated with the season's first cyclone. After this storm was last noted on July 3, more than a month passed before the Lesser Antilles detected the season's second cyclone on August 8. Three systems formed in August, all of which strengthened into hurricanes; each also impacted land. Another three systems formed in September and each of them also strengthened into a hurricane. The first of the three, the fifth cyclone, caused more than $919,000 in losses at least 60 deaths from the Caribbean to the United States and Canada. Some sources suggest that hundreds of fatalities occurred in the Greater and Lesser Antilles, particularly in Haiti. Prior to becoming a Category 4 hurricane, the seventh hurricane struck Haiti as a Category 1 hurricane, compounding the impacts of the fifth storm. With the seventh cyclone existing until at least October 8 and four additional hurricanes forming later that month, this was the most active October on record in terms of number of hurricanes, tied with 1870, 1950, and 2010. The season's eighth storm drowned 27 people offshore New England in mid-October, while the eleventh cyclone, also known as the Gale of 1878, rendered substantial storm surge and wind damage throughout the Eastern United States near the end of the month, with over 71 deaths and more than $2.46 million in damage. After the eleventh storm transitioned into an extratropical cyclone on October 23, the twelfth and final system was first detected east of the Lesser Antilles on November 25. Causing three deaths in Puerto Rico, the cyclone was last noted over the Caribbean Sea south of Jamaica on December 2. Collectively, the storms of the 1878 Atlantic hurricane season caused more than 161 fatalities and over $3.38 million in damage.

The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 181, tied with 1887 for the second highest total of the 19th century and behind only 1893. October alone accounted for a value of 87.8, which remains the all-time highest total in the month of October since HURDAT records began. ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, a storm with a longer duration will have higher values of ACE. It is only calculated at six-hour increments in which specific tropical systems are either at or above sustained wind speeds of 39 mph (63 km/h), which is the threshold for tropical storm intensity. Thus, tropical depressions are not included here.

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