Hurricane Floyd - September 14-17, 1999

A tropical wave that moved off Africa on September 2nd moved westward with little change in
organization until the 7th, when upper level outflow improved over the system and a curved
band of deep convection persisted around the center.  The system was upgraded to a tropical
depression 1000 miles east of the Lesser Antilles around noon on the 7th, and into a tropical
storm that night.  Floyd moved west-northwest to the north of the Lesser Antilles, lured into a
more poleward course by the presence of an upper trough.  Now a hurricane, it moved on a
more westward course when a mid-level high formed to its north.  It strengthened rapidly,
becoming a strong category four hurricane during the morning of the 13th.  As it peaked in
intensity, the track became more northwesterly through the Bahamas as a trough over the
eastern United States began to steer the storm. Slowly weakening, Floyd struck the coast
of North Carolina near Cape Fear during the night of the 15th, while transitioning into an
extratropical storm.   The graphic below, supplied by Wes Junker but originating by work
done by Math Kelsch and Lance Bosart, shows the frontogenesis occurring north of its center
 as it made landfall and its effect on the rainfall distribution.

Hurricane Floyd Extratropical Transition

The cyclone tracked just inland of the coast, reaching Maine during
the morning of the 17th.  It cleared the maritime provinces of Canada on the 19th and
became absorbed by a large cyclone over the North Atlantic later that day.
  Its track is below.

Hurricane Floyd (1999) Track

The graphics below show the storm total rainfall for provided by the National
Climatic Data Center in Asheville, NC.  Note the maximum in southeast North Carolina,
just to the left of where the center made landfall, and the secondary maxima in southeast
Virginia, and southeast New York. Rain in the Mid-Atlantic and New England occurred
along a coastal front which formed in response to Floyd's circulation and a synoptic scale
cold front that impinged on the system's west side.

Hurricane Floyd (1999) Rainfall Floyd (1999) Filled Contour Rainfall
Floyd (1999) Filled Contour Rainfall on White Background

Below is the calendar for Daily Precipitation Maps.  Note that the 24-hour periods end
at 12z that morning.

Sun Mon Tue Wed Thu Fri Sat

16 17 18