Lexington, Massachusetts, USA
Issued by the National Weather Service - Tiyan, GU
Areas Affected: Guam; Rota; Tinian; Saipan
Urgency: Expected
Severity: Moderate
Certainty: Observed
Alert Sent: Friday 7:10pm ChST
Alert Effective: Friday 7:10pm ChST
Alert Expires: Saturday 8:15pm ChST
Event Onset: Friday 7:10pm ChST
Issued by: NWS Tiyan GU
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.
ID: urn:oid:2.49.0.1.840.0.9b21cf6191a6bf267be7d1413bc00a7d7c2badf5.001.1 Codes: GUZ001, MPZ001, MPZ002, MPZ003 Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9b21cf6191a6bf267be7d1413bc00a7d7c2badf5.001.1