ZCZC MIATWOEP ALL
TTAA00 KNHC DDHHMM

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Sun Jul 27 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. Western East Pacific:
An area of low pressure well east-southeast of the Hawaiian Islands 
is producing disorganized showers and thunderstorms. Gradual 
development of this system is possible and a tropical depression 
could form during the next couple of days as it moves generally 
westward around 10 mph.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...40 percent.

2. South of Southwestern Mexico:
A disturbance located several hundred miles south-southwest of the 
Gulf of Tehuantepec is producing a large area of disorganized 
showers and thunderstorms.  During the next day or two, an area of 
low pressure is forecast to form from this area of disturbed 
weather, well off the coast of southwestern Mexico.  Thereafter, 
environmental conditions appear conducive for gradual development of 
this system, and a tropical depression is likely to form late this 
week as it moves west-northwestward or northwestward at 10 to 15 
mph.  
* Formation chance through 48 hours...low...20 percent. 
* Formation chance through 7 days...high...70 percent.




Public advisories on Tropical Storm Iona are issued under WMO header 
WTPA31 PHFO and under AWIPS header HFOTCPCP1. 
Forecast/Advisories on Tropical Storm Iona are issued under WMO 
header WTPA21 PHFO and under AWIPS header HFOTCMCP1.


Forecaster Jelsema