Tropical Storm Warning issued October 1 at 9:22PM ChST…

Tropical Storm Warning issued October 1 at 9:22PM ChST by NWS Tiyan GU, United States of America

Event time: Oct 1, 2026 11:22 UTC Last updated: Oct 10, 2026 United States

Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.

...TROPICAL STORM CHOI-WAN MOVING WEST INTO THE NORTHERN
MARIANAS, SOUTHEAST OF ALAMAGAN...

.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 Tropical Storm Warning remains in effect for Tinian, Saipan, and
adjacent coastal waters.

A Tropical Storm Warning remains in effect for Alamagan, Pagan,
and Agrihan in the CNMI.

A Typhoon Watch remains in effect for Alamagan, Pagan, and Agrihan
in the CNMI.

A Typhoon Watch means that typhoon conditions, including winds of 74
mph or more, are possible within 48 hours.
A Tropical Storm Warning means that tropical storm conditions are
expected within 24 hours.

A Flood Watch remains in effect for Tinian and Saipan. Please listen
closely for any Flash 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 7 PM ChST, the center of Tropical Storm Choi-wan (26W) was
located near latitude 17.0N, longitude 146.4E. This was about 55
miles southeast of Alamagan, 90 miles south-southeast of Pagan,
and 260 miles north-northeast of Guam. Storm motion was west, 280
degrees, at 13 mph. Storm intensity was 45 mph.

.SITUATION OVERVIEW...
Tropical Storm Choi-Wan is expected to slow slightly as it
continues westward overnight, with the center passing to the south
of Alamagan early Friday morning. It is then expected to make a
turn toward the northwest, then north with a decrease in forward
speed through Friday. Then, Choi-wan looks to gradually turn to
the north-northeast on Saturday after it emerges west of the
northern islands. Choi-wan is forecast to intensify through
Friday, potentially becoming a typhoon late Friday night or early
Saturday morning.

This forecasted passage moving along the axis of the far northern
Marianas

Measurements

Coordinates	39.9645, -100.8105
Region	Tinian; Saipan
Location Precision	country
Issuing Authority	United States of America — us-noaa-nws-en
Cap Urgency	Immediate
Cap Certainty	Likely
Cap Expires	2026-10-02T05:30:00+10:00

Official source

Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

Severity as published by WMO Alert Hub (national weather services).

View original report

This event as JSON · API and licence

Source updated 18 days ago (Oct 1, 2026 11:23 UTC) · we last heard from WMO Alert Hub (national weather services) 36 seconds ago

On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.

About this location

The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.

Area as the agency stated it: Tinian; Saipan

Official authorities in United States

If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.

More for United States →

What to do

Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.

Preparing for hurricane season, understanding watches vs warnings, storm surge evacuation, and riding out the storm safely.

Open Hurricane Safety Guide →