![]() Owing to the scarcity of shipping traffic across much of the Caribbean Sea, the storm's intensity and potential track were difficult to assess early in its lifetime. This resulted in the formation of a new low-pressure center and denoted the transition from a tropical to extratropical cyclone at 12:00 UTC on September 30 and these remnants advanced northeastward into the Mid-Atlantic states before they were last noted on October 1 over Pennsylvania. As it entered Mississippi, the storm began to interact with a quasi-stationary front. ![]() ![]() Rapid weakening ensued as the cyclone moved inland, degrading back into a tropical storm within twelve hours of landfall. Although the moist swampland of the Louisianan Acadiana allowed the hurricane to maintain strength longer than what would otherwise be expected, the storm would eventually succumb to land interaction. Analysis of onshore observations also suggested that the storm made landfall with concentric eyewalls. Using this measurement, the Atlantic reanalysis project calculated that the hurricane struck Louisiana with a lower pressure: 944 mbar (hPa 27.88 inHg). At the time, this was the lowest pressure ever recorded in the United States. Near the time of landfall, the hurricane was documented as having a central pressure of 952 mbar (hPa 28.12 inHg) at Tulane University. The hurricane's strongest winds upon landfall were estimated to measure 125 mph (200 km/h), correlating with the upper-end of a Category 3 rating on the modern-day Saffir–Simpson hurricane wind scale. Slight weakening occurred as the storm moved over shallower continental shelf waters, leading up to the hurricane's landfall on the Gulf coast of Louisiana at 18:00 UTC on September 29. As the cyclone neared land, it entered a denser area of shipping traffic, allowing the storm's intensity to be more readily assessed. The hurricane maintained its gradual forward speed and fairly steady intensity as it approached the Louisiana coast. By September 28, the storm had entered the Gulf of Mexico. As the cyclone passed south of Jamaica, it curved towards the northwest, taking it towards the Yucatán Channel. This pressure reading would stand as the lowest taken during the hurricane's lifespan, and also suggested that the storm's initially assessed intensity-equivalent to a modern-day Category 2 hurricane-was significantly underestimated. One ship observation, estimated to have been likely taken late on September 25, documented a barometric pressure of 931 mbar ( hPa 27.50 inHg). At 12:00 UTC the next day, the cyclone's maximum sustained winds crested at 145 mph (230 km/h), making it a powerful Category 4 hurricane if rated using the modern-day Saffir–Simpson hurricane wind scale the storm would maintain winds of this scale for over three days. This steady phase of intensification would continue unhindered as the hurricane progressed across the Caribbean Sea, allowing the storm to reach major hurricane strength on September 24. Tracking slowly towards the west, the nascent tropical cyclone gradually strengthened, reaching hurricane intensity by 00:00 UTC on September 23. ![]() Its tropical cyclogenesis was determined via analysis of atmospheric observations from the surrounding islands, though shipping in the region would confirm the storm's existence the following day. The hurricane killed 275 people and caused $13 million (1915 US dollars) in damage.Įxtratropical cyclone / Remnant low / Tropical disturbance / Monsoon depressionĪccording to the Atlantic hurricane reanalysis project, the 1915 New Orleans hurricane began as a weak tropical storm moving across the southern Windward Islands on September 21, 1915. The storm formed in late September when it moved westward and peaked in intensity of 145 mph (230 km/h) to weaken slightly by time of landfall on September 29 with recorded wind speeds of 126 mph (206 km/h) as a strong category 3 Hurricane. The New Orleans Hurricane of 1915 was an intense Category 4 hurricane that made landfall near Grand Isle, Louisiana, and the most intense tropical cyclone during the 1915 Atlantic hurricane season. Part of the 1915 Atlantic hurricane season Trinidad and Tobago, Windward Islands, Leeward Antilles, Venezuela, Colombia, Jamaica, Honduras, Cayman Islands, Cuba, Yucatán Peninsula, Louisiana, Mississippi, Alabama, Tennessee, Kentucky, West Virginia, Pennsylvania and Mexico
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