Dededo, Guam
Regional Weather Alerts
| Alert: | Rip Current Statement |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-08-23 @ 1:17 pm -> 2026-08-24 @ 1:00 am |
| Onset: | 2026-08-23 @ 1:17 pm -> 2026-08-24 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-08-23 @ 1:17 pm |
| Headline: | Rip Current Statement issued August 24 at 4:17AM ChST until August 24 at 4:00PM ChST by NWS Tiyan GU |
| Description: |
* WHAT...Large breaking waves of 7 to 10 feet and dangerous rip currents. * WHERE...West-facing reefs of the Marianas. * WHEN...Until 4 PM ChST this afternoon. * 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...Significant southwesterly swell driven by the monsoon pattern and Tropical Depression 19W, well north- northwest of Yap, is producing hazardous surf and dangerous rip currents along west-facing reefs through this afternoon. |
| Alert: | High Surf Advisory |
| Area(s): | Guam; Rota; Tinian; Saipan |
| Effective: | 2026-08-23 @ 1:17 pm -> 2026-08-24 @ 1:00 am |
| Onset: | 2026-08-23 @ 1:17 pm -> 2026-08-24 @ 1:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Tiyan GU on 2026-08-23 @ 1:17 pm |
| Headline: | High Surf Advisory issued August 24 at 4:17AM ChST until August 24 at 4:00PM ChST by NWS Tiyan GU |
| Description: |
* WHAT...Large breaking waves of 7 to 10 feet and dangerous rip currents. * WHERE...West-facing reefs of the Marianas. * WHEN...Until 4 PM ChST this afternoon. * 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...Significant southwesterly swell driven by the monsoon pattern and Tropical Depression 19W, well north- northwest of Yap, is producing hazardous surf and dangerous rip currents along west-facing reefs through this afternoon. |
| Alert: | Hydrologic Outlook |
| Area(s): | Guam, GU; Rota, MP; Saipan, MP; Tinian, MP |
| Effective: | 2026-08-23 @ 3:44 am -> 2026-08-24 @ 5:00 am |
| Onset: | 2026-08-23 @ 3:44 am |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Tiyan GU on 2026-08-23 @ 3:44 am |
| Headline: | Hydrologic Outlook issued August 23 at 6:44PM ChST by NWS Tiyan GU |
| Description: |
ESFGUM This Hydrologic Outlook is for Guam, Rota, Tinian, and Saipan. A reinvigorated monsoon trough with a potential embedded tropical disturbance will likely develop in the area and bring periods of heavy rainfall to the Marianas starting midweek. Between Wednesday and Friday, early ensemble guidance suggests 4 to 6 inches with a low probability of up to 10 inches for Guam and Rota, and 3 to 5 inches with a low probability of up to 8 inches for Saipan and Tinian. Heavy showers will moisten soils throughout the event and increase potential for mudslides. Residents of the Marianas need to closely monitor this developing situation as flood watches, advisories and flash flood warnings could be issued later. If living near streams and rivers, prepare to move items away from stream and river banks. Make sure storm drains nearby are not clogged, especially If living at low-lying areas. |