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Invest 99E

South of Southwestern Mexico (EP99): A broad area of low pressure located about 800 miles south-southwest of the southwestern coast of Mexico continues to produce disorganized shower and thunderstorm activity.

Formation chance · 48 hours
40%Medium
Formation chance · 7 days
80%High

What this means

South of Southwestern Mexico (EP99): A broad area of low pressure located about 800 miles south-southwest of the southwestern coast of Mexico continues to produce disorganized shower and thunderstorm activity. Environmental conditions are conducive for development, and a tropical depression is likely to form late this weekend or early next week while it moves generally northward off the coast of southwestern Mexico.

Official resources

Last updated 9/18/2026, 8:00:03 PM · Latest advisory 9/18/2026, 5:43:22 PM