933  
FZUS63 KLOT 212012  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
312 PM CDT TUE AUG 21 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
 
LOW PRESSURE OF 29.6 INCHES OVER LAKE HURON WILL  
DEEPEN FURTHER TO 29.3 MOVES AS IT MOVES THROUGH QUEBEC. HIGH  
PRESSURE OF 30.3 INCHES OVER THE NORTHERN AND CENTRAL PLAINS WILL  
BUILD EAST INTO THE MIDDLE AND UPPER MISSISSIPPI VALLEY REGION BY  
WEDNESDAY NIGHT AND INTO THE OHIO VALLEY THURSDAY AND FRIDAY.  
MEANWHILE, A 29.6 INCH LOW PRESSURE TROUGH WILL DEVELOP OVER THE  
NORTHERN HIGH PLAINS AND SPREAD TO NORTHERN LAKE MICHIGAN EARLY  
SATURDAY AT 29.8 INCHES.  
 
LMZ261-362-364-563-220330-  
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 ROCK ISLAND PASSAGE TO STURGEON BAY WI-  
312 PM CDT TUE AUG 21 2018  
 
STURGEON BAY WI TO POINT BETSIE MI NORTH...  
   
TONIGHT
 
NORTH WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9  
FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 12 FT.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KT EASING TO 10 TO 20 KT.  
SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 3 TO 5 FT  
SUBSIDING TO 2 TO 4 FT FROM LATE MORNING ON.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT BUILDING  
TO 2 TO 4 FT IN THE AFTERNOON.    
THURSDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.    
FRIDAY
 
SOUTH WINDS TO 30 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS IN THE MORNING, THEN SHOWERS LIKELY WITH A CHANCE  
OF THUNDERSTORMS IN THE AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY  
TO 9 FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 12 FT IN THE  
AFTERNOON.    
FRIDAY NIGHT
 
SOUTH WINDS TO 30 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.    
SATURDAY
 
SOUTHWEST WINDS 15 TO 25 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO  
4 TO 6 FT OCCASIONALLY TO 8 FT.    
SUNDAY
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.  
 

 
 
LMZ366-565-567-669-671-868-870-872-220330-  
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO  
MID LAKE-  
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 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 PENTWATER TO MANISTEE MI 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-  
312 PM CDT TUE AUG 21 2018  
 
STURGEON BAY WI TO POINT BETSIE MI SOUTH TO NORTH POINT LIGHT WI  
TO GRAND HAVEN MI...  
   
TONIGHT
 
NORTH WINDS TO 30 KT. SLIGHT CHANCE OF WATERSPOUTS  
THIS EVENING. CHANCE OF THUNDERSTORMS WITH ISOLATED SHOWERS THIS  
EVENING. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 3 TO 5 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.    
THURSDAY
 
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 10 TO  
20 KT. WAVES 1 TO 3 FT.    
THURSDAY NIGHT
 
SOUTH WINDS 15 TO 25 KT. WAVES 2 TO 4 FT  
BUILDING TO 3 TO 5 FT OVERNIGHT.    
FRIDAY
 
SOUTH WINDS TO 30 KT WITH A FEW GALE FORCE GUSTS TO 35  
KT. CHANCE OF SHOWERS AND THUNDERSTORMS IN THE MORNING, THEN  
SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS IN THE AFTERNOON.  
WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.    
FRIDAY NIGHT
 
SOUTHWEST WINDS TO 30 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.    
SATURDAY
 
SOUTHWEST WINDS 15 TO 25 KT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 3 TO 5 FT.    
SUNDAY
 
SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 1 TO 3 FT.  
 

 
 
LMZ080-673-675-777-779-874-876-878-220330-  
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-  
312 PM CDT TUE AUG 21 2018  
 
NORTH POINT LIGHT WI TO GRAND HAVEN MI SOUTH...  
   
TONIGHT
 
NORTH WINDS TO 30 KT. CHANCE OF WATERSPOUTS THIS  
EVENING. SCATTERED SHOWERS WITH A CHANCE OF THUNDERSTORMS THIS  
EVENING. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KT. WAVES 6 TO 9 FT  
OCCASIONALLY TO 12 FT SUBSIDING TO 3 TO 5 FT.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 10 TO 15 KT. WAVES 2 TO 4 FT  
SUBSIDING TO 1 TO 3 FT OVERNIGHT.    
THURSDAY
 
WEST WINDS 5 TO 10 KT BECOMING SOUTHWEST 10 TO 15 KT.  
WAVES 1 TO 2 FT.    
THURSDAY NIGHT
 
SOUTH WINDS 15 TO 25 KT. WAVES 1 TO 3 FT  
BUILDING TO 3 TO 5 FT OVERNIGHT.    
FRIDAY
 
SOUTH WINDS TO 30 KT. SHOWERS LIKELY WITH A CHANCE OF  
THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO  
6 TO 9 FT OCCASIONALLY TO 12 FT IN THE AFTERNOON.   
FRIDAY NIGHT
 
SOUTHWEST WINDS TO 30 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.    
SATURDAY
 
SOUTHWEST WINDS 15 TO 25 KT. WAVES 4 TO 7 FT  
OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT.    
SUNDAY
 
SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES 1 TO 3 FT.  
 

 
 
LMZ761-220330-  
MAFOR 2121/  
MICHIGAN NORTH 14840 11840 11730 12720. WAVES 4 TO 7 FT BUILDING  
TO 6 TO 9 FT OCCASIONALLY TO 12 FT TONIGHT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 2 TO 4 FT WEDNESDAY.  
 
MICHIGAN SOUTH 14840 11840 12730 11720. CHANCE OF WATERSPOUTS  
EARLY THIS EVENING. SCATTERED SHOWERS AND CHANCE OF THUNDERSTORMS  
EARLY THIS EVENING. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT  
TONIGHT. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT SUBSIDING TO 3 TO 5  
FT LATE WEDNESDAY.  
 

 
 
KMD  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/LOT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 
NOTICE - STARTING WEDNESDAY SEPTEMBER 5TH 2018 THIS PRODUCT WILL  
BE ISSUED BY NWS MILWAUKEE. FOR ADDITIONAL INFORMATION:  
 
HTTPS://WWW.WEATHER.GOV/MEDIA/NOTIFICATION/PDFS/SCN18-64LAKE_MICHIGAN_TRANSFER.PDF  
OR CONTACT: ED FENELON AT EDWARD.FENELON@NOAA.GOV OR BEN SCHOTT  
AT BEN.SCHOTT@NOAA.GOV  
 
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