WWPQ82 PGUM 050750

SPSPQ2



SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE TIYAN GU

550 PM ChST Tue May 5 2026



PMZ171-172-060800-

YAP-CHUUK-

550 PM ChST Tue May 5 2026



...INVEST 93W NOW UNDER A TROPICAL CYCLONE FORMATION ALERT WEST OF CHUUK...

...LOCALLY HEAVY SHOWERS, STRONG GUSTS, AND CHOPPY SEAS LIKELY 

THROUGH WEDNESDAY FOR CHUUK STATE AND MID TO LATE WEEK FOR YAP 

STATE...



Invest 93W continues to become better organized this evening near 

8N149E in between Chuuk and Satawal, well southeast of the Marianas. 

The Joint Typhoon Warning Center (JTWC) has upgraded the disturbance 

to High with a Tropical Cyclone Formation Alert, meaning formation 

into a tropical cyclone (tropical depression) is expected within the 

next 24 hours. Current presentation of the system has the strongest 

wind field located to the north, up to 25 knots, with scattered to 

numerous locally heavy showers as convection continues to flare 

around the center. 



Current model trends support gradual strengthening over the coming 

days as the system moves to the west-northwest, expected to pass well

southwest of the Marianas as it moves through Yap State. However, 

guidance continues to support an asymmetric wind field to the north 

of the center, creating variability in conditions across Chuuk and 

Yap States through late week. Numerous to widespread heavy showers 

will accompany the disturbance as it moves through western Chuuk and 

Yap States through the week. Gusty winds, locally heavy showers, and 

choppy seas will be the primary hazards with the disturbance, likely 

making inter-island travel hazardous. If the overall wind field 

becomes more symmetric late this week, potential will increase for a 

westerly swell to develop south of the system and create impacts for 

islands sensitive to westerly swells. 



Residents and mariners should monitor the latest forecasts for the 

region at weather.gov/gum/PublicForecasts and any information shared 

by WSO Yap and WSO Chuuk for the local regions. For more information 

on Invest 93W, see bulletins issued by JTWC under WMO header ABPW10 

PGTW and WTPN21 PGTW.



$$



Schank/Whisnant