990  
FZUS63 KMKX 210924  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  
324 AM CST TUE JAN 21 2025  
 
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  
 
ARCTIC HIGH PRESSURE AROUND 30.8 INCHES OVER THE SOUTHERN GREAT PLAINS  
WILL MOVE EAST ACROSS THE OHIO RIVER VALLEY THROUGH TONIGHT.  
THIS WILL MAINTAIN BREEZY WEST WINDS ACROSS LAKE MICHIGAN THROUGH  
TODAY, AND SHIFT TO SOUTHWEST OVERNIGHT INTO WEDNESDAY. BRISK  
WEST WINDS WILL COMBINE WITH ELEVATED WAVE HEIGHTS AND FRIGID AIR  
TEMPERATURES TO SUPPORT HEAVY FREEZING SPRAY. HEAVY FREEZING  
SPRAY WARNINGS ARE IN EFFECT THROUGH THIS MORNING IN THE NORTHERN  
THIRD, AND INTO THIS EVENING FOR THE SOUTHERN TWO THIRDS.  
 
LOW PRESSURE AROUND 29.8 INCHES WILL ACROSS THE NORTHERN GREAT  
LAKES WEDNESDAY INTO WEDNESDAY NIGHT WITH A COLD FRONT TO FOLLOW.  
THE BREEZY SOUTHWEST WINDS LATE TONIGHT INTO EARLY WEDNESDAY  
AFTERNOON MAY REACH GALE FORCE FOR THE SOUTH HALF, HENCE A GALE  
WATCH IS IN EFFECT. THE WINDS WILL THEN SHIFT TO NORTHWESTERLY  
FOR WEDNESDAY NIGHT AND THURSDAY, BUT NOT AS WINDY.  
 
 
LMZ261-362-364-366-563-565-211630-  
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-  
324 AM CST TUE JAN 21 2025  
 
TWO RIVERS WI TO MANISTEE MI NORTH...  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 6 AM CST EARLY  
THIS MORNING...  
   
TODAY  
WEST WINDS 15 TO 25 KT. CHANCE OF SNOW. WAVES 4 TO 6 FT  
OCCASIONALLY TO 8 FT.    
TONIGHT  
WEST WINDS TO 30 KT BECOMING SOUTHWEST. CHANCE OF  
LIGHT FREEZING RAIN AND SLIGHT CHANCE OF SNOW IN THE EVENING,  
THEN CHANCE OF SNOW AND SLIGHT CHANCE OF LIGHT FREEZING RAIN  
OVERNIGHT. FREEZING SPRAY OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY  
TO 8 FT BUILDING TO 8 TO 11 FT OCCASIONALLY TO 14 FT.    
WEDNESDAY  
SOUTHWEST WINDS TO 30 KT. FREEZING SPRAY. SNOW IN  
THE MORNING, THEN CHANCE OF SNOW IN THE AFTERNOON. WAVES 10 TO  
14 FT OCCASIONALLY TO 18 FT SUBSIDING TO 7 TO 10 FT OCCASIONALLY  
TO 13 FT.    
WEDNESDAY NIGHT  
WEST WINDS 15 TO 25 KT BECOMING NORTHWEST  
10 TO 20 KT. CHANCE OF SNOW IN THE EVENING. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO  
8 FT.    
THURSDAY  
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST.  
WAVES 1 TO 3 FT.    
FRIDAY  
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST 15 TO 25 KT.  
WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.    
SATURDAY  
SOUTHWEST WINDS TO 30 KT BECOMING WEST. WAVES 4 TO  
6 FT OCCASIONALLY TO 8 FT.  
 
 
 
LMZ567-868-211630-  
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-  
324 AM CST TUE JAN 21 2025  
 
TWO RIVERS WI TO MANISTEE MI SOUTH TO SHEBOYGAN WI TO PENTWATER  
MI...  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS  
AFTERNOON...  
   
TODAY  
WEST WINDS 10 TO 20 KT. HEAVY FREEZING SPRAY THIS  
MORNING. CHANCE OF SNOW. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.    
TONIGHT  
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 30 KT.  
FREEZING SPRAY. SLIGHT CHANCE OF SNOW IN THE EVENING, THEN CHANCE  
OF SNOW OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT BUILDING  
TO 8 TO 11 FT OCCASIONALLY TO 14 FT.    
WEDNESDAY  
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.  
FREEZING SPRAY. SNOW IN THE MORNING, THEN CHANCE OF SNOW IN THE  
AFTERNOON. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO  
8 TO 11 FT OCCASIONALLY TO 14 FT.    
WEDNESDAY NIGHT  
WEST WINDS 15 TO 25 KT BECOMING NORTHWEST  
10 TO 20 KT. CHANCE OF SNOW IN THE EVENING. WAVES 6 TO 9 FT  
OCCASIONALLY TO 12 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO  
8 FT.    
THURSDAY  
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.    
FRIDAY  
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 1 TO  
3 FT BUILDING TO 2 TO 4 FT.    
SATURDAY  
SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST. WAVES 4 TO  
7 FT OCCASIONALLY TO 9 FT.  
 
 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-211630-  
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-  
324 AM CST TUE JAN 21 2025  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS  
AFTERNOON...  
...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY  
AFTERNOON...  
   
TODAY  
WEST WINDS 10 TO 20 KT. HEAVY FREEZING SPRAY. SNOW  
LIKELY THIS MORNING, THEN CHANCE OF SNOW THIS AFTERNOON. WAVES  
4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 4 TO 6 FT  
OCCASIONALLY TO 8 FT.    
TONIGHT  
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH GALES TO  
35 KT LATE. HEAVY FREEZING SPRAY POSSIBLE. CHANCE OF LIGHT  
FREEZING RAIN IN THE EVENING, THEN CHANCE OF SNOW AND SLIGHT  
CHANCE OF LIGHT FREEZING RAIN OVERNIGHT. WAVES 4 TO 6 FT  
OCCASIONALLY TO 8 FT BUILDING TO 8 TO 11 FT OCCASIONALLY TO 14 FT.   
WEDNESDAY  
SOUTHWEST GALES TO 35 KT DIMINISHING TO 30 KT.  
FREEZING SPRAY. SNOW IN THE MORNING, THEN CHANCE OF SNOW IN THE  
AFTERNOON. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO  
8 TO 11 FT OCCASIONALLY TO 14 FT.    
WEDNESDAY NIGHT  
SOUTHWEST WINDS TO 30 KT BECOMING WEST 10 TO  
20 KT OVERNIGHT. SNOW LIKELY IN THE EVENING, THEN CHANCE OF SNOW  
OVERNIGHT. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO  
5 TO 8 FT OCCASIONALLY TO 10 FT.    
THURSDAY  
NORTHWEST WINDS 10 TO 20 KT. CHANCE OF SNOW. WAVES  
3 TO 5 FT.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 15 KT. WAVES 3 TO 5 FT.    
FRIDAY  
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 2 TO  
4 FT BUILDING TO 3 TO 5 FT.    
SATURDAY  
SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST. WAVES 4 TO  
7 FT OCCASIONALLY TO 9 FT.  
 
 
 
LMZ761-211630-  
MAFOR 2111/  
MICHIGAN NORTH 11630 11620 13630 13540. A CHANCE OF SNOW TODAY. A  
CHANCE OF LIGHT FREEZING RAIN THIS EVENING, THEN A CHANCE OF SNOW  
OVERNIGHT. WAVES 3 TO 6 FEET TODAY. WAVES 3 TO 6 FEET BUILDING TO  
5 TO 9 FEET TONIGHT.  
 
MICHIGAN SOUTH 12627 12622 11520 11530 11542 11552. A CHANCE OF  
LIGHT FREEZING RAIN THIS EVENING. WAVES 4 TO 7 FEET SUBSIDING TO  
3 TO 6 FEET TODAY. WAVES 3 TO 6 FEET BUILDING TO 5 TO 9 FEET  
TONIGHT.  
 
 
 
GEHRING  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MKX/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
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