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::1858 Atlantic hurricane season

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The 1858 Atlantic hurricane season was one of four seasons on record in which every tropical cyclone intensified into a hurricane.<ref name="ACE"/> The first hurricane was first observed over the northwestern Caribbean Sea on June 12. The sixth and final storm was last noted on October 26. These dates fall within the period with the most tropical cyclone activity in the Atlantic. Three tropical cyclones during the season existed simultaneously. Two of the cyclones have only a single known point in its track due to a sparsity of data. Operationally, another tropical cyclone was believed to have existed over the eastern Atlantic between September 17 and September 18, but HURDAT – the official Atlantic hurricane database – excludes this system. However, in the absence of modern satellite and other remote-sensing technologies, only cyclones that affected populated land areas or encountered ships at sea are currently known, so the actual total could be higher. An undercount bias of zero to four tropical cyclones per year between 1886 and 1910 has been estimated.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> Of the six known 1858 Atlantic cyclones, five were first documented in 1995 by Jose Fernandez-Partagas and Henry Diaz.<ref name="partagas-1">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

The first system was spotted over the western Caribbean Sea on June 12. It had a single-point track. Another tropical cyclone was first observed over the northern Atlantic Ocean on August 5 and also had a single-point track. On September 14, the next system was observed over the southeastern Gulf of Mexico. Several hours later, the storm struck Florida, causing severe damage to crops. Strong winds and rough seas were reported by ships and on land, particularly in Maine. The storm dissipated on September 17. That same day, another tropical cyclone developed over the central Atlantic. The storm capsized the bark Phantom, though no one drowned. The next hurricane developed over the Bahamas on September 22, but caused little damage, despite its proximity to land. On October 21, the sixth and final system of the season was first observed over the Bahamas. The storm brought coastal flooding to Nassau and Bermuda later in its duration, before dissipating on October 26.

The season's activity was reflected with a low accumulated cyclone energy (ACE) rating of 45.<ref name="ACE">{{#invoke:citation/CS1|citation |CitationClass=report }}</ref> ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. It is only calculated for full advisories on tropical systems at or exceeding 39 mph (63 km/h), which is tropical storm intensity.<ref>{{#invoke:citation/CS1|citation |CitationClass=report

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1858 Atlantic hurricane season sections
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