736 WHGM70 PGUM 170112 MWWGUM URGENT - MARINE WEATHER MESSAGE National Weather Service Tiyan GU 1112 AM ChST Sat Oct 17 2026 PMZ151-152-172000- /O.CON.PGUM.TY.W.4029.000000T0000Z-000000T0000Z/ Guam Coastal Waters-Rota Coastal Waters- 1112 AM ChST Sat Oct 17 2026 ...TYPHOON WARNING REMAINS IN EFFECT... * WHAT....Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Onset of damaging winds beginning Saturday night. Onset of destructive winds Sunday morning. Damaging winds will continue into at least Sunday night, possibly longer if conditions warrant. * IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon Champi (29W) continues to move quickly toward the Marianas. The exact path of 29W remains subject to change. However, guidance supports a passage through Guam coastal waters, with damaging winds moving in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further today as it approaches, then move through the region as a typhoon Sunday morning. Seas will quickly rise, with significant sea heights reaching as high as 35 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS...Prepare for the passage of a typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Tropical Storm Champi approaches, stay in safe harbor. && $$ PMZ153-154-172000- /O.CON.PGUM.TR.W.4029.000000T0000Z-000000T0000Z/ /O.CON.PGUM.TY.A.4029.000000T0000Z-000000T0000Z/ Tinian Coastal Waters-Saipan Coastal Waters- 1112 AM ChST Sat Oct 17 2026 ...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... * WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected. Typhoon conditions, including winds of 64 knots or more are possible within the next 48 hours. * WHERE...Tinian and Saipan Coastal Waters. * WHEN...Onset of damaging winds beginning late tonight, continuing into at least Sunday night, possibly longer if conditions warrant. * IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon Champi (29W) continues to move quickly toward the Marianas. The exact path of 29W remains subject to change. However, guidance supports a passage through Guam coastal waters, with damaging winds moving into Tinian and Saipan tonight and lasting into at least Sunday night. Champi is expected to strengthen further today as it approaches, then move through the region as a typhoon Sunday morning. Seas will quickly rise, with significant sea heights reaching as high as 25 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS...Prepare for tropical storm force conditions Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Tropical Storm Champi approaches the Marianas, stay in safe harbor. && $$ Montvila  987 WHUS73 KDTX 170149 MWWDTX URGENT - MARINE WEATHER MESSAGE National Weather Service Detroit/Pontiac MI 949 PM EDT Fri Oct 16 2026 LHZ361-362-170800- /O.CON.KDTX.GL.W.0016.000000T0000Z-261017T0800Z/ Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore- 949 PM EDT Fri Oct 16 2026 ...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EDT SATURDAY... * WHAT...Expect sustained winds up to 28 knots from the north with gusts up to 34 knots. The largest significant waves will be 10 feet with a potential maximum wave height of 14 feet. * WHERE...Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore and Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore. * WHEN...The maximum winds are expected around 10 PM EDT Friday with the largest waves expected around 10 PM EDT Friday. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. && $$ LHZ363-441>443-462>464-170800- /O.CON.KDTX.GL.W.0016.000000T0000Z-261017T0800Z/ Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore-Port Austin to Harbor Beach MI- Harbor Beach to Port Sanilac MI-Port Sanilac to Port Huron MI- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 949 PM EDT Fri Oct 16 2026 ...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EDT SATURDAY... * WHAT...Expect sustained winds up to 32 knots from the north with gusts up to 37 knots. The largest significant waves will be 14 feet with a potential maximum wave height of 20 feet. * WHERE...Portions of Lake Huron. * WHEN...The maximum winds are expected around 10 PM EDT Friday with the largest waves expected around 10 PM EDT Friday. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. && $$ LHZ421-422-170800- /O.CON.KDTX.GL.W.0016.000000T0000Z-261017T0800Z/ Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- 949 PM EDT Fri Oct 16 2026 ...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EDT SATURDAY... * WHAT...Expect sustained winds up to 31 knots from the north with gusts up to 37 knots. The largest significant waves will be 8 feet with a potential maximum wave height of 11 feet. * WHERE...Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay and Inner Saginaw Bay SW of Point Au Gres to Bay Port MI. * WHEN...The maximum winds are expected around 10 PM EDT Friday with the largest waves expected around 10 PM EDT Friday. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. && $$ LCZ460-170800- /O.CON.KDTX.GL.W.0016.000000T0000Z-261017T0800Z/ Lake St Clair- 949 PM EDT Fri Oct 16 2026 ...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EDT SATURDAY... * WHAT...Expect sustained windsup to 30 knots from the north with gusts up to 37 knots. The largest significant waves will be 4 feet with a potential maximum wave height of 5 feet. * WHERE...Lake St Clair. * WHEN...The maximum winds are expected around 10 PM EDT Friday with the largest waves expected around 10 PM EDT Friday. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. && $$ LEZ444-171400- /O.CON.KDTX.SC.Y.0063.000000T0000Z-261017T1400Z/ Michigan Waters of Lake Erie from Detroit River to North Cape MI- 949 PM EDT Fri Oct 16 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT SATURDAY... * WHAT...Expect sustained winds up to 24 knots from the north with gusts up to 30 knots. The largest significant waves will be 4 feet with a potential maximum wave height of 5 feet. * WHERE...Michigan Waters of Lake Erie from Detroit River to North Cape MI. * WHEN...The maximum winds are expected around 10 PM EDT Friday with the largest waves expected around 10 PM EDT Friday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$  255 WHUS73 KGRR 170157 MWWGRR URGENT - MARINE WEATHER MESSAGE National Weather Service Grand Rapids MI 957 PM EDT Fri Oct 16 2026 LMZ844>849-170600- /O.CON.KGRR.GL.W.0014.000000T0000Z-261017T0600Z/ St Joseph to South Haven MI-South Haven to Holland MI- Holland to Grand Haven MI-Grand Haven to Whitehall MI- Whitehall to Pentwater MI-Pentwater to Manistee MI- 957 PM EDT Fri Oct 16 2026 ...GALE WARNING REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY... * WHAT...North winds 20 to 30 knots with gusts up to 35 knots and waves 7 to 10 feet. * WHERE...St Joseph to Manistee. * WHEN...Until 2 AM EDT Saturday. * IMPACTS...Strong winds will cause hazardous waves which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. && $$