NHC Tropical Weather Outlook

Tropical Weather Outlook NWS National Hurricane Center Miami FL 500 PM PDT Fri Sep 18 2026 For the eastern and central North Pacific east of 180 longitude: South-Southwest of Southwestern Mexico (EP99): A broad area of low pressure located well 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. • Formation chance through 48 hours...medium...50 percent. • Formation chance through 7 days...high...80 percent. Western East Pacific (EP98): Showers and thunderstorms associated with an area of low pressure located well southwest of the southern tip of the Baja California Peninsula remain disorganized. Environmental conditions are conducive for development, and a tropical depression is likely to form this weekend as it moves westward at 10 to 15 mph across the western East Pacific. • Formation chance through 48 hours...high...70 percent. • Formation chance through 7 days...high...80 percent. Well East-Southeast of t