It reached its maximum intensity between 12Z on the 15th and 12Z on the 16th as it moved up the GA, SC, NC coast. Here are some images of Floyd at various times during its history, taken from NOAA's Operational Significant Event Imagery Server . Sep 99 Radiosondes Several radiosonde sites along the east coast were effected by Floyd. The table below shows what soundings were taken. M indicates a missing sounding at a synoptic time.
P indicates a partial sounding.
In generating summary statistics, these soundings are associated with the hour of the column in which they appear. However, the hurricane had moved substantially to the north by the 16th, yet JAX still has no soundings on the 16th and 17th. On Fri the 17th, Philadelphia was experiencing bad weather but Atlanta and O'Hare were not. I therefore surmise that the absence of any soundings at JAX on the 17th was due mostly to general backups in the route system more than to specific weather problems in any particular region. GSO was north of Floyd on the 15th, and shows a normal number of soundings that day.