1866/01:  No major changes from Partagas and Diaz's (1995a) analysis.  No track available, only one point.  Storm is determined to have reached hurricane status based upon reports from Matagorda, Texas.

1866/02:  No major changes from Partagas and Diaz's (1995a) analysis. Inland winds over Mexico reduced via Kaplan and DeMaria's (1995)  inland decay model with an accelerated rate of decay to account for enhanced topography.  Storm is determined to have reached hurricane status based upon observations from the ship "A. E. Patterson" and
the Fortress Monroe.

1866/03:  No major changes from Partagas and Diaz's (1995a) analysis.  Storm is determined to have reached hurricane status based upon reports from ships "Messina" and "Robert Wing".

1866/04:  Major change from Partagas and Diaz's (1995a) analysis is to not assume that the hurricane was stationary for three days at 15N and 29.5W.  Only one six-hourly position/intensity is provided on 12 UTC of the 18th.  Storm is determined to have reached hurricane status based upon ship reports from the "Iddo Kimball".

1866/05:  No major changes from Partagas and Diaz's (1995a) analysis.

1866/06:  No major changes from Partagas and Diaz's (1995a) analysis. Central pressure observation from Nassau with 938 mb gives 120 kt with the southern wind-pressure relationship, which is used in the best track. Storm is determined to have reached major hurricane status based upon this central pressure measurement as well as several ship reports.

1866/07:  Major change from Partagas and Diaz's (1995a) analysis is to extend track back one day to the 28th based upon discussion in their analysis.  Inland winds over New England reduced via Kaplan and DeMaria's (1995) inland decay model.  Storm is determined to have reached hurricane status based upon observations at Fortune Island, Bahamas.