778  
FZUS63 KLOT 240822  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
222 AM CST SAT FEB 24 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 30.3 INCHES OVER THE UPPER  
MISSISSIPPI VALLEY WILL QUICKLY MOVE TO QUEBEC BY EVENING.  
MEANWHILE, LOW PRESSURE OF 29.7 INCHES ORGANIZING OVER THE TEXAS  
PANHANDLE WILL DEEPEN TO 29.3 INCHES AS IT QUICKLY MOVES TO NEAR  
MILWAUKEE BY MIDNIGHT TONIGHT, THEN CONTINUE TO DEEPEN TO NEAR  
29.0 INCHES AS IT REACHES JAMES BAY BY EARLY SUNDAY EVENING. WEAK  
HIGH PRESSURE OF 30.2 INCHES WILL MOVE FROM THE SOUTHERN PLAINS  
THIS EVENING TO THE OHIO VALLEY AND LOWER GREAT LAKES REGION BY  
MONDAY MORNING IS THE WAKE OF THE DEEP LOW.  
 
LMZ261-362-364-366-563-565-567-868-241630-  
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-  
222 AM CST SAT FEB 24 2018  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
 
...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH SUNDAY  
EVENING...  
   
TODAY
 
NORTHWEST WINDS 10 TO 15 KT BECOMING LIGHT AND VARIABLE  
THIS MORNING, THEN BECOMING EAST AND INCREASING TO 10 TO 20 KT BY  
LATE AFTERNOON. WAVES 1 TO 3 FT.   
TONIGHT
 
EAST WINDS TO 30 KT BECOMING SOUTHEAST GALES TO  
40 KT DURING THE EVENING, THEN SHIFTING TO SOUTHWEST GALES TO 456  
KT LATE. RAIN WITH POSSIBLE SNOW AND SLEET. WAVES 4 TO 6 FT  
OCCASIONALLY TO 8 FT BUILDING TO 7 TO 10 FT OCCASIONALLY TO 13 FT.   
SUNDAY
 
SOUTHWEST GALES TO 45 KT IN THE MORNING WITH OCCASIONAL  
STORM FORCE GUSTS TO AROUND 50 KT, ESPECIALLY TOWARD THE STRAITS.  
WINDS EASING SLIGHTS TO SOUTHWEST GALES TO 40 KT IN THE AFTERNOON.  
CHANCE OF RAIN IN THE MORNING. WAVES 12 TO 16 FT OCCASIONALLY TO  
21 FT.    
SUNDAY NIGHT
 
SOUTHWEST GALES TO 35 KT BECOMING WEST TO 30 KT.  
WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO 8 FT  
OCCASIONALLY TO 10 FT.    
MONDAY
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.    
MONDAY NIGHT
 
SOUTHWEST WINDS TO 30 KT. WAVES 4 TO 7 FT  
OCCASIONALLY TO 9 FT.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO  
15 KT. WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.    
WEDNESDAY
 
EAST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-241630-  
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-  
222 AM CST SAT FEB 24 2018  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
 
...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH SUNDAY  
AFTERNOON...  
   
TODAY
 
NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 15 TO 25 KT.  
WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT.    
TONIGHT
 
EAST WINDS TO 30 KT INCREASING TO GALES TO 35 KT EARLY  
IN THE EVENING, BECOMING SOUTHEAST GALES TO 40 KT LATE IN THE  
EVENING...THEN SHIFTING TO SOUTHWEST GALES TO 45 KT LATE. RAIN AND  
SLIGHT CHANCE OF THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY TO 9  
FT BUILDING TO 8 TO 11 FT OCCASIONALLY TO 14 FT.   
SUNDAY
 
WEST GALES TO 45 KT BECOMING SOUTHWEST TO 30 KT. WAVES  
8 TO 12 FT OCCASIONALLY TO 16 FT SUBSIDING TO 7 TO 10 FT  
OCCASIONALLY TO 13 FT.    
SUNDAY NIGHT
 
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO  
25 KT. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO  
7 FT OCCASIONALLY TO 9 FT.    
MONDAY
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
MONDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES 2 TO  
4 FT.    
WEDNESDAY
 
SOUTHEAST WINDS 10 TO 20 KT DIMINISHING TO 10 TO  
15 KT. WAVES 1 TO 3 FT.  
 

 
 
LMZ761-241630-  
MAFOR 2410/  
MICHIGAN NORTH...GALE WARNING IN EFFECT...11710 11900 11200 11210  
11220 11246 12356. WAVES 1 TO 3 FT TODAY AND 4 TO 6 FT  
OCCASIONALLY TO 8 FT BUILDING TO 7 TO 10 FT OCCASIONALLY TO 13 FT  
TONIGHT.  
 
MICHIGAN SOUTH...GALE WARNING IN EFFECT...10810 13120 12230 11246  
19256 11356 11566. WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT TODAY  
AND 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 8 TO 11 FT  
OCCASIONALLY TO 14 FT TONIGHT.  
 

 
 
- IZZI  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/LOT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 
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