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Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Mon Jul 28 2025

For the eastern and central North Pacific east of 180 longitude:

Active Systems: 
The National Hurricane Center is issuing advisories on Tropical 
Storm Iona, located in the central Pacific basin well southeast of 
the Hawaiian Islands.

1. Eastern portion of the Central Pacific (CP91):
Shower and thunderstorm activity associated with a small low 
pressure area located about 950 miles southeast of the Hawaiian 
Islands is showing signs of organization and have persisted 
overnight.  If current trends continue, a tropical depression or 
storm is likely to develop later this morning or this afternoon. 
* Formation chance through 48 hours...high...80 percent.
* Formation chance through 7 days...high...80 percent.

2. Western East Pacific (EP98):
Showers and thunderstorms associated with an area of low pressure 
located about 1650 miles east-southeast of the Hawaiian Islands 
have become a little better organized overnight.  Additional  
development of this system is possible, and a tropical depression 
could form during the next day or two as it moves generally 
westward around 10 mph.
* Formation chance through 48 hours...medium...60 percent.
* Formation chance through 7 days...medium...60 percent.

3. South of Southwestern Mexico:
A trough of low pressure located several hundred miles 
south-southwest of the Gulf of Tehuantepec is producing a large 
area of disorganized showers and thunderstorms.  Environmental 
conditions are expected to be conducive for gradual development, 
and a tropical depression is likely to form during the middle to 
later part of this week as it moves west-northwestward or 
northwestward at 10 to 15 mph.  
* Formation chance through 48 hours...medium...40 percent. 
* Formation chance through 7 days...high...90 percent.



Forecaster Brown