TL;DR
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NWS Tiyan issued a Typhoon Warning at 11:12 a.m. ChST Oct. 17 for Guam and Rota coastal waters as Typhoon Champi approached. The agency forecast damaging winds beginning Saturday night, destructive winds Sunday morning and seas potentially reaching 35 feet near the storm’s closest passage. The alert was replaced at 3:37 p.m. ChST, so readers should check the latest NWS bulletin for current conditions and warning status.
The National Weather Service office in Tiyan issued a Typhoon Warning for Guam and Rota coastal waters at 11:12 a.m. ChST on Oct. 17, forecasting damaging winds from Saturday night and destructive winds Sunday morning as Typhoon Champi approached the Marianas. The alert warned that seas could reach 35 feet near the storm’s closest passage and urged vessels to remain in safe harbor.
The warning covered the Guam Coastal Waters and Rota Coastal Waters. NWS said typhoon conditions, including winds of at least 64 knots, were expected. Its forecast called for damaging winds to begin Saturday night, with destructive winds arriving Sunday morning and damaging winds continuing at least through Sunday night, potentially longer depending on conditions.
The alert said Champi was moving quickly toward the Marianas and was expected to strengthen as it approached, then pass through the region as a typhoon Sunday morning. It forecast rapidly rising seas, with significant wave heights possibly reaching 35 feet during closest passage. Dangerous sea conditions could persist into Monday, according to the bulletin.
NWS warned that destructive winds could create seas dangerous enough to damage, capsize or sink vessels, while heavy rain could sharply reduce visibility. It described conditions as catastrophic for small craft and extremely dangerous for larger vessels, and instructed mariners to secure vessels and stay in safe harbor. The alert record carried an Extreme severity designation and an immediate urgency classification.
Dangerous Seas Threaten Marianas Vessels
The warning matters most to people operating or working aboard vessels in waters around Guam and Rota. Forecast winds and seas of the stated magnitude can make travel and routine marine work dangerous, while reduced visibility in heavy rain can add to the risk. NWS explicitly advised vessels to remain in safe harbor rather than attempt to ride out the storm at sea.
The forecast also describes a period of hazardous conditions, not just a brief point of closest approach. Damaging winds were expected to continue at least into Sunday night, and dangerous seas could last into Monday. The warning therefore called for mariners to account for the duration of the threat as well as the storm’s passage. The bulletin did not provide a specific evacuation instruction for residents on land; this alert was for coastal waters.
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Champi’s Forecast Track Remained Uncertain
The warning identified the approaching system as Typhoon Champi, also designated 29W. NWS said forecast guidance supported a passage through Guam coastal waters, while stressing that the storm’s exact path remained subject to change. That distinction is important: the agency described a likely regional passage but did not present the precise track as settled.
The bulletin was issued at 11:12 a.m. ChST on Oct. 17, with the alert initially set to expire at 6 a.m. ChST Oct. 18. Its data also records that the alert was replaced at 3:37 p.m. ChST that day. The available notice does not include the replacement bulletin’s wording, so the original forecast should not be treated as the latest status. The source identifies the warning area as coastal waters, rather than specifying a separate land-area warning.
Track and Current Alert Status
The exact track of Champi remained subject to change, according to NWS. The warning’s forecast of a passage through Guam coastal waters and seas reaching as high as 35 feet referred to expected conditions, not observations confirming that those outcomes occurred. The provided alert does not report later storm impacts or measured wind and wave conditions.
The alert data says this notice was replaced at 3:37 p.m. ChST on Oct. 17, but does not supply the replacement notice’s details. It is therefore unclear from this source whether the warning area, timing, forecast or expiration time changed. Readers should consult the latest official NWS alert rather than rely on the original notice for current status.
Check Updated NWS Marine Alerts
Mariners in and around Guam and Rota should follow current NWS Tiyan marine bulletins and local official guidance, since the Oct. 17 alert was replaced later that afternoon. The original forecast anticipated damaging winds from Saturday night, destructive winds Sunday morning and hazardous seas potentially lasting into Monday, but subsequent forecasts may revise those times and conditions.
Vessel operators should follow the warning’s direction to secure vessels and remain in safe harbor, and should use updated official information when deciding when conditions permit safe movement. The source material does not establish what happened after the warning was issued or give a later all-clear time.
Key Questions
Which areas were covered by the Typhoon Warning?
The notice covered Guam Coastal Waters and Rota Coastal Waters. It was a marine warning and did not, in the supplied text, identify a separate land-area warning.
What conditions did NWS forecast?
NWS forecast typhoon conditions, including winds of at least 64 knots, with damaging winds beginning Saturday night and destructive winds expected Sunday morning. It said significant sea heights could reach 35 feet near closest passage, with dangerous seas possibly continuing into Monday.
What did officials advise vessel operators to do?
The warning instructed mariners to secure vessels and stay in safe harbor. It characterized conditions as catastrophic for small craft and extremely dangerous for larger vessels.
Is the Oct. 17 warning still the latest alert?
Not based on the supplied alert record: it says the notice was replaced at 3:37 p.m. ChST on Oct. 17. The replacement’s contents are not included, so check the latest NWS Tiyan notice for current warning status and forecasts.
Source: hazard
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