Hurricane Humberto - September 11-15, 2007
A broad low pressure area formed along a surface trough in the western
Gulf of Mexico. An area of thunderstorms
formed on the northern end of the trough, which forced the development
of a new, well-defined low pressure area.
The system organized into a tropical depression on the morning of the
12th. Rapid development ensued, and within
18 hours of becoming a tropical depression Humberto became a tropical
storm and then a hurricane as it headed
north-northeast into the Golden Triangle of Southeast Texas during the
early morning hours of the 13th, becoming
the most rapidly developing tropical cyclone known to develop close to
land in the Atlantic Basin. Weakening
slowly after landfall, Humberto regained tropical storm and then
tropical depression status as it moved through
Louisiana into Mississippi. Its surface circulation was left
behind across Louisiana as west-southwest vertical
wind shear carried its mid-level center northeastward.
According to surface analyses and satellite imagery, as Humberto's
mid-level circulation continued progressing
northeast, it spawned a new low pressure area in Georgia which forced
the original circulation southeast towards
northern Florida before dissipation. As the mid-level center
continued progressing, a third cyclone in southeast
Virginia developed and moved northeast into the western Atlantic,
absorbing the second low.
Below are the storm total
graphics, prepared with data from the NWS River Forecast Centers.
As it approached
the Texas coast, warm advection ahead of the cyclone overran a frontal
boundary to its east-northeast, leading
to an area of moderate to heavy rain which spread out well ahead of the
cyclone into the Carolinas.