FZUS63 KLOT 191705 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Chicago/Romeoville IL 856 AM CDT Wed Sep 19 2018 FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan. Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered. .SYNOPSIS...High pressure of 30.1 inches over Ontario and the northern Great Lakes will gradually shift northeast tonight. Low pressure of 29.5 inches will develop over the Central Plains tonight and then lift northeast to the Upper Mississippi Valley Thursday evening. The low will track across the Upper Great Lakes Thursday night while dragging a strong cold front across the lake. High pressure of 30.4 inches will spread across the Upper Mississippi Valley and Great Lakes Region Saturday. LMZ261-362-364-366-563-565-567-868-192030- Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and north of a line from Charlevoix MI to South Fox Island 5 NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to Mid Lake- Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid Lake- 856 AM CDT Wed Sep 19 2018 SHEBOYGAN WI TO PENTWATER MI NORTH... ...GALE WATCH IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY EVENING... .REST OF TODAY...Northeast winds 10 to 15 kt. Chance of showers and thunderstorms this afternoon. Waves 1 to 3 ft. .TONIGHT...East winds 10 to 15 kt increasing to 10 to 20 kt. Chance of showers in the evening, then showers likely overnight. Waves 1 to 3 ft. .THURSDAY...Southeast winds 10 to 20 kt increasing to 30 kt. Showers with a chance of thunderstorms in the morning, then chance of showers and thunderstorms in the afternoon. Waves 3 to 5 ft. .THURSDAY NIGHT...South winds to 30 kt increasing to gales to 35 kt during the evening, then becoming southwest gales to 40 kt overnight. Chance of showers and thunderstorms. Waves 5 to 8 ft occasionally to 10 ft building to 10 to 14 ft occasionally to 18 ft. .FRIDAY...West gales to 40 kt becoming northwest gales to 35 kt. Waves 10 to 14 ft occasionally to 18 ft subsiding to 6 to 9 ft occasionally to 12 ft. .FRIDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft. .SATURDAY...Southeast winds 10 to 15 kt veering to southwest 10 to 20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. .SUNDAY...Northeast winds 10 to 15 kt becoming east 10 to 20 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-192030- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 856 AM CDT Wed Sep 19 2018 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TODAY...Northeast winds 10 to 20 kt. Slight chance of showers and thunderstorms this afternoon. Waves 2 to 4 ft. .TONIGHT...East winds 10 to 20 kt becoming southeast. Chance of showers and thunderstorms in the evening, then showers and thunderstorms likely overnight. Waves 2 to 4 ft. .THURSDAY...Southeast winds 10 to 20 kt becoming south. Chance of showers and thunderstorms in the morning. Waves 2 to 4 ft building to 3 to 5 ft. .THURSDAY NIGHT...South winds to 30 kt becoming southwest. A few gale force gusts to 35kt possible. Waves 5 to 8 ft occasionally to 10 ft building to 7 to 10 ft occasionally to 13 ft. .FRIDAY...West winds to 30 kt becoming northwest. Gales to 35 kt possible. Waves 6 to 9 ft occasionally to 12 ft. .FRIDAY NIGHT...North winds to 30 kt becoming northeast 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft. .SATURDAY...East winds 10 to 20 kt becoming southeast 5 to 10 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .SUNDAY...East winds 10 to 15 kt. Waves 1 ft or less. $$ LMZ761-192030- MAFOR 1915/ MICHIGAN NORTH 13110 12210 12219 11329. Chance of showers and thunderstorms this afternoon. Waves 1 to 3 ft today and tonight. Waves 3 to 5 ft Thursday morning. MICHIGAN SOUTH 13120 12220 13329. Chance of showers and thunderstorms this evening. Waves 2 to 4 ft. $$ The gale watch for northern portions of Lake Michigan will be reissued by NWS Milwaukee this morning. This will be the final Open Waters Forecast for Lake Michigan issued by NWS Chicago. Updates to this forecast as well as routine forecasts will be transferred to NWS Milwaukee this morning. For additional information: https://www.weather.gov/media/notification/pdfs/scn18-64lake_michigan_transfer.pdf Or Contact: Tim Halbach at Timothy.j.Halbach@noaa.gov Or Ed Fenelon at Edward.Fenelon@noaa.gov