Tropical Depression 01W has formed northwest of Koror  in the Republic of Palau. This tropical depression is expected to gradually strengthen into a tropical storm during the next 24 hours, as it remains over the open ocean of the west Pacific. 

We’re starting to see an increase in showers east of Guam and Rota. This should work its way into these areas later this morning and into the afternoon. Farther north at Tinian and Saipan look for just isolated showers today to be the most we can hope for.

January 3, 2026 7:00am ChST BUILDING SEAS AND SURF SUNDAY NIGHT A building northerly swell is expected to arrive to the Marianas Sunday night, producing a significant increase in seas and surf through at least the first half of next week.

Flash Flood Warning continues for Santa Rita GU and Inarajan GU until 6:00 AM ChST

Flash Flood Warning including Mangilao GU, Santa Rita GU and Inarajan GU until 6:00 AM ChST

December 22, 2025 Urban and Small Stream Advisory through 12pm ChST. Heavy rain is causing minor flooding in low-lying and poor drainage areas across central and southern Guam until 1200 PM ChST.

December 12, 2025 - No Tsunami Threat to Guam/CNMI from Distant Earthquake An earthquake with preliminary magnitude of 6.7 occurred at 12:44 PM ChST near Honshu, Japan. Additional Info: https://t.co/T2FWdTfePu

No Tsunami Threat for Marianas From Earthquake near Japan - December 9, 2025 An earthquake with preliminary magnitude of 7.6 occurred at 12:15 AM ChST of near Hokkaido, Japan. Additional Info: https://t.co/T2FWdTfePu

Weather Overview - Saturday, November 29, 2025\nWetter Pattern around Marianas. Incoming swell will build surf along north and possibly east facing reefs. High risk of rip currents along east facing reefs of the Marianas starting Sunday. Next King Tide cycle December 4th.

No Tsunami Threat for the region.

November 9, 2025 - An earthquake with preliminary magnitude of 6.7 occurred at 6:04 PM ChST of the east coast of Honshu, Japan. There is NO tsunami threat to region based on all available data. Additional Info: https://t.co/T2FWdTfePu

NOTE: A lightning bolt at 3:47 PM caused our connection to the radar to be lost. Technicians at Andersen AFB have been notified and are en route. A Flood Advisory is in effect through 5:45 PM for all of Guam. Additional rain amounts of 1 to 2 inches are possible through 5:45 PM.

A Flood Advisory is in effect through 3:45 PM as additional heavy showers move northwest over central and southern portions of Guam. Up to 1 inch of rain has fallen this hour, with 2-4 inches since noon having been observed.

The Flood Advisory has been upgraded to a Flash Flood Warning. Automated gauges near Cross Island Road have measured 1.9 inches of rainfall over the past hour. Additional rainfall of 1 to 2 inches remain possible and may prolong any potential flooding.

Flash Flood Warning including Santa Rita GU and Inarajan GU until 2:15 PM ChST

A flood advisory is in effect for areas south of route eight, south of the airport. This advisory is in effect until 1:45 PM. Depending on radar trends, a warning may need to be issued.

Please join us for an update regarding the weather for the Marianas, and the Western Micronesia locations Palau and Yap. https://t.co/X6ilbiTmOY

JTWC has issued a TCFA for Invest 90W, which is expected to consolidate as it moves northwest, near or south of the Marianas, bringing heavy rains and strong winds to Guam, Rota, and the outer islands of Yap and Chuuk State through the latter half of the week. #guwx

Active weather will continue for Western Micronesia and the Marianas this weekend and next week. Heavy rainfall may lead to flash flooding while gusty winds can blow loose objects around. #GUwx

An active weather pattern has taken shape across Micronesia and the Marianas. Invest 98W will impact Palau and Yap this weekend and a Special Weather Statement was issued for heavy rain and windy conditions. #GUwx