A reanalysis of the Atlantic basin tropical storm and hurricane database (''best track'') for the period from 1921 to 1930 has been completed. This reassessment of the main archive for tropical cyclones of the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico was necessary to correct systematic biases and random errors in the data as well as to search for previously unrecognized systems. The methodology for the reanalysis process for revising the track and intensity of tropical cyclone data has been detailed in a previous paper on the reanalysis. The 1921-30 dataset now includes several new tropical cyclones, excludes one system previously considered a tropical storm, makes generally large alterations in the intensity estimates of most tropical cyclones (both toward stronger and weaker intensities), and typically adjusts existing tracks with minor corrections. Average uncertainty in intensity and track values is estimated for both open-ocean conditions as well as landfalling systems. Highlights are given for changes to the more significant hurricanes to impact the United States, Central America, and the Caribbean for this decade.

Routine military aircraft reconnaissance of tropical cyclones in the Atlantic Basin began in 1944.According to the preliminary reanalysis of the 1944-1953 Atlantic hurricane seasons (Hagen et al. 2012), the tropical cyclones of that decade that were sampled one or more times by aircraft reconnaissance are listed below according to revised storm number. Most of the new tropical cyclones and all of the cyclones that stayed completely in the eastern half of the basin were not sampled, and some cyclones in the western half of the basin were not sampled as well. Most of these were short-lived tropical storms or storms that were over water for less than a day.The list of tropical cyclones in this appendix indicates whether each cyclone was sampled one or more times by aircraft. The column on the right lists the number of TC days during the cyclone's lifetime during which there was at least one aircraft reconnaissance flight. TC days for which the cyclone was overland for all 24 hours are not included in the days column. The phrase "excluding E. Atlantic only" means that tropical cyclones who's entire lifetime occurred in the eastern Atlantic and outside the range of aircraft reconnaissance were not tallied in that metric.The phrase "extra E. Atlantic days" adds up the number of days TCs spent over the east Atlantic that eventually reached the western Atlantic. For the ten-year period of 1944-53, there was aircraft reconnaissance on 381/512 (74%) of the days during which there was a TC occurring in the western half of the basin that was listed in the original HURDAT database. Storm (Dates) At least 1 flight?Days with at least 1 flight

A reanalysis of the Atlantic basin tropical storm and hurricane database (''best track'') for the period from 1921 to 1930 has been completed. This reassessment of the main archive for tropical cyclones of the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico was necessary to correct systematic biases and random errors in the data as well as to search for previously unrecognized systems. The methodology for the reanalysis process for revising the track and intensity of tropical cyclone data has been detailed in a previous paper on the reanalysis. The 1921-30 dataset now includes several new tropical cyclones, excludes one system previously considered a tropical storm, makes generally large alterations in the intensity estimates of most tropical cyclones (both toward stronger and weaker intensities), and typically adjusts existing tracks with minor corrections. Average uncertainty in intensity and track values is estimated for both open-ocean conditions as well as landfalling systems. Highlights are given for changes to the more significant hurricanes to impact the United States, Central America, and the Caribbean for this decade.

The main historical archive of all tropical storms, subtropical storms, and hurricanes in the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico from 1851 to the present is known as the Atlantic hurricane database (HURDAT), which is the fundamental database for meteorological, engineering, and financial studies of these cyclones. Previous work has demonstrated that a reanalysis of HURDAT is necessary because it contains many random errors and systematic biases. The Atlantic Hurricane Reanalysis Project is an ongoing effort to correct the errors in HURDAT and to make HURDAT as accurate a database as possible with utilization of all available data. For this study, HURDAT is reanalyzed for the period 1944-53, the first decade of the ''aircraft reconnaissance era.'' The track and intensity of each existing tropical cyclone in HURDAT are reassessed, and previously unrecognized tropical cyclones are discovered, analyzed, and recommended to the HURDAT Best Track Change Committee for inclusion into HURDAT (existing tropical cyclones may be removed from the database as well if analyses indicate evidence that no tropical storm existed). Changes to the number of tropical storms, hurricanes, major hurricanes, accumulated cyclone energy, and U.S. landfalling hurricanes are recommended for most years of the decade. Estimates of uncertainty in the reanalyzed database for the decade are also provided.