158
FGMY70 PGUM 240714
ESFGUM
GUC010-MPC100-110-120-242000-

Hydrologic Outlook
National Weather Service Tiyan GU
514 PM ChST Mon Aug 24 2026


...BUILDING COL OVERHEAD AND ASSOCIATED DIFFUSIVE FLOW TO MITIGATE
ANY HEAVY RAINFALL POTENTIAL THE NEXT SEVERAL DAYS...

This Hydrologic Outlook is for Guam, Rota, Tinian, and Saipan.

A reinvigorated monsoon trough with a potential embedded tropical
disturbance that was previously expected to develop and bring periods
of heavy rainfall to the Marianas beginning Wednesday, has continued
to fallen behind. The mid to long-term model guidance continues to
show a downward trend in any potential cyclogenesis, with the
enhanced monsoon pattern now likely to fall apart over the next few
days, pushing back any potential heavy rainfall into the weekend,
potentially even into early next week as the col overhead lingers and
forces diffusive flow. Due to this uncertainty, this will be the last
Hydrologic Outlook issued for this rain event, unless conditions
warrant a new issuance in the coming days.

$$

EM