Eastern North Pacific 2-Day GTWO
Expand 2-Day GTWO

Eastern North Pacific 5-Day GTWO
Expand 5-Day GTWO

ABPZ20 KNHC 231140

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Sat Sep 23 2017

For the eastern North Pacific...east of 140 degrees west longitude:

A low pressure system located about 100 miles southwest of Manzanillo, Mexico, has become better defined overnight. Although associated shower and thunderstorm activity has changed little, environmental conditions are expected to remain favorable for a tropical depression to form later today or on Sunday. Interests in Colima and Jalisco should monitor the progress of this system for any potential watches or warnings issued this weekend. Regardless of development, very heavy rains are expected over portions of southwestern Mexico during the next several days. * Formation chance through 48 hours...high...90 percent. * Formation chance through 5 days...high...90 percent.

A large area of disorganized showers and thunderstorms is associated with a broad area of low pressure located south of Guatemala over the far eastern Pacific. Some gradual development of this system is possible over the next few days before the system moves over Central America early next week. * Formation chance through 48 hours...low...10 percent. * Formation chance through 5 days...low...30 percent.

$$ Forecaster Stewart