A tropical disturbance formed south of Guatemala on September 26th. The system moved briskly to the west, forming
a closed circulation south of the Mexican Riviera by the 29th. The tropical depression contined to develop, becoming
a tropical storm by the 30th. Moving at a more modest pace to the west-northwest, Joanne became a hurricane on
October 1st well west of Mazatlan. Turning more to the north due to the influence of an upper trough, the system passed
the subtropical ridge axis on the 4th and turned to the northeast towards northern Baja California. Moving over increasingly
cooler water, Joanne weakened into a tropical storm west of Point Eugenia, crossing northern Baja California on the night
of the 5th before moving into Sonora. The graphics below show the storm total rainfall from Joanne using data provided
by the National Climatic Data Center in Asheville, North Carolina and the Comision Nacional del Agua, parent
agency of Mexico's national weather service..
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