Headline:
Tropical Storm Warning issued October 3 at 3:23PM ChST by NWS Tiyan GU
Event:
Tropical Storm Warning
Urgency:
Immediate
Effective:
October 2, 2026 - 10:23pm
Expires:
October 3, 2026 - 4:00am
Description:
...TYPHOON CHOI-WAN MOVING NORTHEAST AND AWAY FROM AGRIHAN...
.NEW INFORMATION...
None.
.AREAS AFFECTED...
This local statement provides information and recommended actions
for people on Saipan, Tinian, Agrihan, Pagan and Alamagan in the
Commonwealth of the Northern Marianas.
.WATCHES/WARNINGS...
A Typhoon Warning remains in effect for Alamagan, Agrihan and Pagan
in the CNMI.
A Tropical Storm Warning remains in effect for Tinian and Saipan and
their adjacent waters in the CNMI.
A Flood Watch remains in effect for all of Guam and the Northern
Marianas. Please listen closely for any Flood Warnings that might be
in effect for your area.
Please check the latest public and marine forecasts for detailed
information about additional hazards.
.STORM INFORMATION...
At 2 PM ChST, the center of Typhoon Choi-wan (26W) was located near
latitude 19.0N and longitude 145.5E. This was about 20 miles north-
northwest of Agrihan, and about 270 miles north of Saipan. Storm
motion was northeast, 35 degrees, at 7 mph with maximum sustained
winds of 100 mph, becoming a Category 2 typhoon. Choi-wan is expected
to make a slight turn toward the north-northeast with a slight
increase in forward speed through Sunday, moving away from the
Marianas. Choi-wan is forecast to intensify further through tonight,
becoming a Category 3 typhoon tonight.
.SITUATION OVERVIEW...
Typhoon Choi-wan continues to intensify, and is expected to become a
Category 3 typhoon tonight as it continues moving away from the
Marianas and passing near Maug to the northeast. A Typhoon Warning
remains in effect for Alamagan, Pagan and Agrihan. Due to the
enhancement of the monsoon surge along the southern peripheries of
Choi-wan, TS conditions are still expected at Tinian, Saipan and
their adjacent waters in the early evening hours tonight, but then
becoming more likely to fall below TS conditions as the night goes
on.
Instruction:
Stay indoors during heavy rain and tropical storm-force wind
conditions associated with Typhoon Choi-wan (26W). Heed the advice
of your local emergency managers and officials, and continue to
monitor forecasts by the National Weather Service office in Tiyan,
Guam. Remain in sturdy shelter until the all clear is given.
Remain in suitable shelter, such as a cave or sturdy concrete
structure. Shelter in place until the all-clear is given.
.WIND INFORMATION...
Typhoon winds of 74 mph or more will continue for Alamagan, Agrihan
and Pagan into this evening as Choi-wan treks north through the
northern CNMI and strengthens further into a Category 3 typhoon. On
either side of the typhoon-force winds, tropical storm force winds of
39 to 73 mph look to continue through at least Sunday morning.
.COASTAL INUNDATION AND SURF INFORMATION...
Hazardous surf of 10 to 14 feet along north, south, and west facing
reefs are expected to continue, increasing by several feet during
the time of nearest passage. As Choi-wan continues to strengthen,
dangerous surf is likely along all reefs at all three islands through
at least Sunday. Significant coastal erosion and some coastal
inundation is expected during Choi-wan's passage.
.OTHER STORM EFFECTS...
Periods of torrential rain, widespread heavy showers and scattered
thunderstorms are expected through tonight, producing rainfall totals
of 8 to 14 inches by early Monday morning, with up to 20 inches of
rainfall possible near the center of the system.
Area Description:
Tinian; Saipan
Forcast Office:
NWS Tiyan GU
Sender:
w-nws.webmaster@noaa.gov