Issued by the National Weather Service and archived by Claims Pages
EXPIRED7/20/2025 4:05:00 PM (UTC)Urgency: FutureSeverity: UnknownCertainty: Possible
7/20/2025 4:05:00 PM until 7/21/2025 6:45:00 PM
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
ESFGUM
This Hydrologic Outlook is for the Guam, Rota, Tinian and Saipan.
A tropical disturbance could bring heavy rain to the Marianas from
Thursday evening through Sunday. Latest model guidance shows a
surface trough within Pohnpei State that is expected to move
northwest over the next couple of days. This trough is expected to
develop into a weak circulation Thursday or Friday near the
Marianas. Models differ on location and strength of this
circulation, however, they do agree that heavy rainfall is likely as
early as Thursday, continuing through the Weekend.
There is a potential for Guam and the CNMI to see rainfall amounts
of 5 to 10 inches by Sunday, though locally heavier amounts are
possible. This rainfall is expected to produce minor flooding across
the islands, with flash flooding possible in the areas of heavier
rainfall, especially over southern Guam.
Residents on the Marianas need to closely monitor this developing
situation as watches, advisories and warnings could be issued later.
If living near streams and rivers, prepare to move items away from
stream and river banks. Make sure storm drains nearby are not
clogged, especially if living in low-lying areas.