A slow-moving tropical wave crossed
over Central America and eastern Mexico between the 1st and 3rd
of October, spawning Tropical
Depression Eleven over the southwest Gulf of Mexico on the 4th. The
southern
portion of the wave produced an area of disturbed weather over the
Pacific waters in the vicinity of Acapulco,
Mexico
early on the 5th. For the next couple of
days, the system was strongly sheared from the east and lacked
enough organized deep convection to be classified as a tropical
depression.
Early on the 8th, deep convection became
better organized around a
low-level center, and Tropical Depression Fourteen-E
developed that morning 125 miles
south-southwest of
Manzanillo, Mexico.
Initially the cyclone moved slowly north-northwestward
and strengthened
into a tropical storm 100 miles south-
southwest
of Manzanillo later on the 8th. A strong mid-tropospheric
ridge
developed over northern Mexico and
this feature steered Irwin northwest, away from the coast of mainland
Mexico.
However, the center of the storm
came within about 75 miles of the coastline
between Manzanillo and Cabo Corrientes early on the 9th.
Later
that day,
Irwin turned toward the west-northwest and, in the presence of
moderate east-northeasterly shear, the storm
intensified to its peak
strength of 50 knots by late on the morning of the 9th.
Early on the 10th, the ridge to Irwin's north forced it
on a westward
course, and northeasterly shear combined
with more stable air began to take
its toll on the tropical cyclone. Later that day, Irwin turned toward
the
west-
southwest and the center of the weakening cyclone passed over Socorro
Island. By that time, essentially all
deep convection
associated with Irwin was gone, and the system's winds
diminished below storm strength. The
cyclone dissipated early on 11th about 350 miles southwest of
Cabo San Lucas. Below lies its track, supplied
by the
National Hurricane Center.