Hurricane Greg - September 1-10, 1999

The southern extension of the tropical wave that triggered Tropical Storm Emily in the Atlantic moved westward through
 the Caribbean Sea for several days and crossed Central America between 31 August and 1 September.  Satellite imagery
 revealed a middle-level circulation with a large area of thunderstorms associated with the wave moving westward partially
 inland over southern Mexico. A large area of disturbed weather associated with a cyclonic monsoon-type flow had prevailed
 over the eastern Pacific for several days. However, it was not until the tropical wave arrived in the area that tropical cyclone
 formation began. The thunderstorm activity became concentrated while cloud banding features were developing.  Satellite
 imagery suggested the formation of a 30-knot tropical depression very near Manzanillo, Mexico early on the morning of
 the 5th.  It appears that the same tropical wave combined with the strong southwest monsoonal-type flow which extended
 northward into the Bay of Campeche, led the formation of the Atlantic Tropical Depression Seven in the Gulf of
Mexico during that period.

The eastern Pacific depression continued to become better organized, and both satellite images and ship reports indicated
 that the tropical cyclone reached tropical storm strength by the afternoon of the 5th.  Greg was then moving on a general
 northwest track very close to the southwestern coast of Mexico.  A large area of very deep convection formed near the
 center of circulation and radar from Los Cabos, Mexico suggested the formation of an ragged eye during the morning of
the 6th. Greg was upgraded to hurricane status that afternoon while approaching the southern portion of Baja California.
No significant change in strength occurred for the next 24 hours, and thereafter, Greg weakened to tropical storm status as
 its center moved over the area of Cabo San Lucas around 2100 UTC 7 September. Greg turned toward the west-northwest
and west over cooler waters and weakening began.  Below is its track, supplied by the National Hurricane Center.

Track of Hurricane Greg (1999)

The graphics below show the storm total rainfall for Greg, which used information from the Comision del
Agua, which is the parent agency of Mexico's National Weather Service. 

Greg (1999) Storm Total Rainfall
Greg (1999) Storm Total Rainfall Greg (1999) Storm Total Rainfall