860
WWMY80 PGUM 240005
SPSGUM

Special Weather Statement
National Weather Service Tiyan GU
1005 AM ChST Thu Jul 24 2025

GUZ001-MPZ001>003-240400-
Guam-Rota-Tinian-Saipan-
1005 AM ChST Thu Jul 24 2025

...TROPICAL DEPRESSION AND TRAILING MONSOON SURGE TO IMPACT THE
MARIANAS OVER THE COMING DAYS...
...HEAVY RAIN, STRONG WINDS, AND CHOPPY SEAS AND SURF POSSIBLE...

Invest 98W has intensified into Tropical Depression (TD) 12W to
the west of Guam. TD 12W will make a turn to the north northwest
today, likely passing to the west of the CNMI through Saturday. A
strong southwest monsoon surge is expected to develop across the
Marianas in its wake. Heavy rainfall and breezy to windy
conditions are expected across the Marianas through Saturday with
the passage TD 12W and the ensuing monsoon surge.

Heavy rains will spread northward through today and tonight and
will likely continue even as 12W later moves away from the islands
due to the onset of a very wet southwest monsoon flow. Currently,
6 to 12 inches of rain is possible through Saturday night, and
periods of very heavy rainfall may result in localized flooding.
Additionally, the the risk of mudslides could increase with a
prolonged multi-day heavy rain pattern.

TD 12W will bring winds and seas hazardous to small craft. There
is a potential for gale force gusts to develop beginning tonight
as 12W lifts slowly north-northwest while strengthening. As this
occurs, a southwesterly wind will strengthen, especially across
the western waters of the CNMI.

TD 12W will bring hazardous surf conditions across the Marianas.
A high risk of rip currents along east facing reefs will shift to
west and south facing reefs tonight into Friday and will likely
continue through Saturday night.

For more information on TD 12W, see bulletins issued by JTWC
under WMO header WTPN33 PGTW.

Residents across the Marianas should continue monitoring local
weather forecasts from the National Weather Service in Guam, and
for additional information from your local emergency management
office. Visit weather.gov/gum for the latest weather information
from the National Weather Service.

$$

Slagle