677  
FZUS63 KLOT 191356  
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  
 
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