Saipan, Northern Mariana Islands
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-04-10 @ 4:10 am |
| Onset: | 2026-04-10 @ 4:10 am -> 2026-04-11 @ 5:15 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-04-10 @ 4:10 am |
| Headline: | Special Weather Statement issued April 10 at 7:10PM ChST by NWS Tiyan GU |
| Description: |
Tropical Storm Sinlaku (04W) continues to organize north-northwest of Chuuk. This system is currently moving very slowly in a west to northwest direction, and this trend is expected to continue for another roughly another 24 to 36 hours, before increasing slightly in forward speed. TS Sinlaku is expected to strengthen as it approaches the Marianas, possibly crossing Guam as a category 3 typhoon. Models continue to show a slight spread where TS Sinlaku's track could shift slightly north or south, though these ranges are narrowing and will continue to narrow over the next 12-24 hours. A breezy, but relatively dry trade-wind pattern is in place over the Marianas tonight, but as Tropical Storm Sinlaku closes in, winds are expected to increase with conditions deteriorating sometime late Sunday. The Marianas should make preparations for the potential for Tropical Storm to Typhoon-Force winds, with the most likely time of Tropical Storm-Force winds around Monday. For the far northern Mariana Islands, breezy and choppy sea conditions are expected late this weekend and into early next week, with potential for Tropical Storm-Force winds around Tuesday. This is expected to produce 15 to 20 inches of rainfall between Sunday night and Wednesday for Guam and Rota, with 8 to 15 inches expected for Tinian and Saipan. Widespread showers, torrential rain and scattered thunderstorms are expected as Sinlaku moves through the Marianas Tuesday through Tuesday night. As showers are likely to persist, consistent rainfall is likely to produce flash floods and saturate the soils enough to increase the chance for mudslides over central to southern Guam. |
| Alert: | Rip Current Statement |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-04-10 @ 1:37 am -> 2026-04-12 @ 3:00 am |
| Onset: | 2026-04-10 @ 1:37 am -> 2026-04-10 @ 3:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-04-10 @ 1:37 am |
| Headline: | Rip Current Statement issued April 10 at 4:37PM ChST until April 12 at 6:00PM ChST by NWS Tiyan GU |
| Description: |
* WHAT...Large breaking waves of 8 to 12 feet and dangerous rip currents. * WHERE...North and east facing reefs of the Marianas. * WHEN...Until 6 PM ChST Sunday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water. * ADDITIONAL DETAILS...Strong to near-gale trade winds, enhanced by TS Sinlaku, are producing an east swell near 10 feet. This will produce hazardous surf of 8 to 10 feet along north facing reefs and 10 to 12 feet along east facing reefs. Surf is expected to continue to build through Sunday, with dangerous surf likely by Sunday afternoon. |
| Alert: | High Surf Advisory |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-04-10 @ 1:37 am -> 2026-04-12 @ 3:00 am |
| Onset: | 2026-04-10 @ 1:37 am -> 2026-04-10 @ 3:00 pm |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-04-10 @ 1:37 am |
| Headline: | High Surf Advisory issued April 10 at 4:37PM ChST until April 12 at 6:00PM ChST by NWS Tiyan GU |
| Description: |
* WHAT...Large breaking waves of 8 to 12 feet and dangerous rip currents. * WHERE...North and east facing reefs of the Marianas. * WHEN...Until 6 PM ChST Sunday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water. * ADDITIONAL DETAILS...Strong to near-gale trade winds, enhanced by TS Sinlaku, are producing an east swell near 10 feet. This will produce hazardous surf of 8 to 10 feet along north facing reefs and 10 to 12 feet along east facing reefs. Surf is expected to continue to build through Sunday, with dangerous surf likely by Sunday afternoon. |
| Alert: | Special Weather Statement |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-04-09 @ 8:29 pm |
| Onset: | 2026-04-09 @ 8:29 pm -> 2026-04-10 @ 8:30 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-04-09 @ 8:29 pm |
| Headline: | Special Weather Statement issued April 10 at 11:29AM ChST by NWS Tiyan GU |
| Description: |
Tropical Storm Sinlaku (04W) continues to organize north-northwest of Chuuk. This system will continue to move very slowly in a west to northwest direction for another 24 to 36 hours, before increasing forward speed as it strengthens. The current forecasts have the system strengthening into a typhoon or stronger, and approaching the Marianas. The potential track takes TS Sinlaku into the Marianas, near Guam. However, models continue to show a slight spread where TS Sinlaku's track could shift slightly north or south, though these ranges are narrowing and will continue to narrow over the next 12-24 hours. A breezy, but relatively dry trade-wind pattern is in place over the Marianas, but as Tropical Storm Sinlaku closes in, conditions will deteriorate sometime around late Sunday. The Marianas should make preparations for the potential for Tropical Storm or Typhoon-Force winds, with the most likely time of Tropical Storm-Forced winds around Monday. For the far northern Mariana Islands, breezy and choppy sea conditions are expected late this weekend and inter early next week, with potential for Tropical Storm-Force winds around Tuesday. Locally heavy rainfall is likely with Tropical Storm Sinlaku. Models show the potential 10 to 15 inches near the center of TS Sinlaku, but if any of the islands will see this rainfall will depend on exact track of TS Sinlaku. Ensemble guidance shows broader potential for 5-8 inches across Guam, and 3-5 inches for Rota, Tinian, and Saipan, but higher rainfall totals may shift depending if the track of Tropical Storm Sinlaku shifts southward or northward. of rainfall to develop for Guam early next week |