Tropical Storm Hanna - August
Several days after emerging offshore the coast of Africa, an
area of low pressure formed near a tropical wave,
accompanied by significant thunderstorm activity. On August 28,
the system became well enough organized to
be classified as Tropical Depression Eight by the National Hurricane
Center. Later in the day, the system
continued to develop and became a tropical storm. Experiencing
vertical wind shear throughout much of its
existence, the system moved west into the southeastern Bahamas before
dropping southward towards Haiti
on the 30th. As it did so, Hanna briefly strengthened into a
hurricane. During this time, heavy rains within
its eastern periphery fell across Hispaniola and Puerto Rico.
Below are the storm total rainfall graphics for
Puerto Rico, using data provided by the Southeast River Forecast Center.
By September 3rd, Hanna finally turned to the northwest just shy of
Hispaniola, and moved just east of the
Bahamas before making landfall at Myrtle Beach, South Carolina on the
6th. Its convective pattern took on
a hooked appearance, concentrating on its northwest side well prior to
landfall due to southeast vertical
shear, and this rainfall pattern continued as Hanna moved through the
Carolinas, Mid-Atlantic states,
New England. By early on the 7th, Hanna became an extratropical
cyclone before moving through
Canada. Below are the storm total rainfall graphics
associated with Hanna.
Data was compiled from
the National Weather Service River Forecast Centers, public information
statements from National Weather
Forecast Offices across the East, CoCoRaHS, and Environment Canada.
Below are graphics showing rainfall
associated with Hanna across Atlantic Canada, in millimeters, with data
provided by Environment Canada.