381  
FZUS63 KLOT 220830  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
230 AM CST MON JAN 22 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 29.4 INCHES OVER THE KANSAS CITY AREA  
EARLY THIS MORNING WILL CROSS LAKE MICHIGAN TONIGHT, THEN  
CONTINUE ACROSS SOUTHERN QUEBEC TUESDAY EVENING. A BROAD RIDGE OF  
HIGH PRESSURE OF 30.3 INCHES OVER THE PLAINS TUESDAY NIGHT WILL  
MOVE ACROSS THE WESTERN GREAT LAKES WEDNESDAY AND TO THE NORTHEAST  
U.S. ON FRIDAY, STRENGTHENING TO 30.7 INCHES AS IT DOES SO.  
ANOTHER LOW OF 29.4 INCHES WILL DEVELOP IN LEE OF THE NORTHERN  
ROCKIES THURSDAY NIGHT, MOVING TO NEAR JAMES BAY BY SATURDAY  
MORNING.  
 
LMZ261-362-364-366-563-565-221645-  
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-  
230 AM CST MON JAN 22 2018  
 
TWO RIVERS WI TO MANISTEE MI NORTH...  
 
...GALE WARNING IN EFFECT FROM 9 AM CST THIS MORNING THROUGH  
TUESDAY AFTERNOON...  
   
TODAY
 
NORTHEAST WINDS 15 TO 25 KT INCREASING TO GALES TO 40  
KT. PATCHY FOG. CHANCE OF RAIN SHOWERS EARLY THIS MORNING AND THEN  
RAIN AND SNOW SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT  
BUILDING TO 8 TO 12 FT OCCASIONALLY TO 16 FT.   
TONIGHT
 
NORTHEAST GALES TO 40 KT DIMINISHING TO 35 KT. WINTRY  
MIX. WAVES 8 TO 12 FT OCCASIONALLY TO 16 FT.    
TUESDAY
 
NORTH GALES TO 40 KT DIMINISHING TO GALES TO 35 KT.  
CHANCE OF SNOW IN THE MORNING. WAVES 8 TO 12 FT OCCASIONALLY TO  
16 FT SUBSIDING TO 7 TO 10 FT OCCASIONALLY TO 13 FT.    
TUESDAY NIGHT
 
NORTH WINDS TO 30 KT DIMINISHING TO 15 TO 20 KT.  
WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT SUBSIDING TO 3 TO 5 FT.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.  
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 10 KT BECOMING SOUTHWEST.  
WAVES 1 TO 2 FT.    
THURSDAY
 
SOUTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.    
FRIDAY
 
SOUTH WINDS TO 30 KT. WAVES 6 TO 9 FT OCCASIONALLY TO  
12 FT.  
 

 
 
LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-221645-  
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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 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-  
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-  
230 AM CST MON JAN 22 2018  
 
TWO RIVERS WI TO MANISTEE MI SOUTH...  
   
..DENSE FOG ADVISORY IN EFFECT UNTIL 9 PM CST THIS EVENING
 
 
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY  
AFTERNOON...  
   
TODAY
 
EAST WINDS 15 TO 25 KT INCREASING TO 30 KT AND THEN  
BECOMING SOUTHEAST 15 TO 25 KT. AREAS OF DENSE FOG. RAIN SHOWERS  
WITH A CHANCE OF THUNDERSTORMS THIS MORNING... THEN RAIN SHOWERS  
THIS AFTERNOON. WAVES 3 TO 5 FT BUILDING TO 5 TO 8 FT  
OCCASIONALLY TO 10 FT.   
TONIGHT
 
SOUTHEAST WINDS 15 TO 20 KT BECOMING SOUTHWEST 15 TO 25  
KT LATE IN THE EVENING...THEN BECOMING NORTHWEST GALES TO 35 KT  
LATE. AREAS OF DENSE FOG IN THE EVENING. RAIN SHOWERS LIKELY WITH  
SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING...THEN RAIN AND SNOW  
OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 8 TO  
12 FT OCCASIONALLY TO 16 FT LATE.    
TUESDAY
 
NORTHWEST GALES TO 40 KT DIMINISHING TO GALES TO  
35 KT. CHANCE OF SNOW IN THE MORNING...THEN CHANCE OF SNOW  
SHOWERS IN THE AFTERNOON. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT  
SUBSIDING TO 8 TO 11 FT OCCASIONALLY TO 14 FT.    
TUESDAY NIGHT
 
NORTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO  
20 KT OVERNIGHT. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING  
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT  
SUBSIDING TO 2 TO 4 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST.  
WAVES 1 TO 3 FT.    
THURSDAY
 
SOUTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.    
FRIDAY
 
SOUTH WINDS TO 30 KT. WAVES 5 TO 8 FT OCCASIONALLY TO  
10 FT.  
 

 
 
LMZ761-221645-  
MAFOR 2210/  
MICHIGAN NORTH...GALE WARNING IN EFFECT...10133 11143 12157 19257  
13157 12157. PATCHY FOG TODAY. CHANCE OF RAIN SHOWERS EARLY THIS  
MORNING. WINTRY MIX TONIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT  
BUILDING TO 8 TO 12 FT OCCASIONALLY TO 16 FT TODAY. WAVES 8 TO 12  
FT OCCASIONALLY TO 16 FT TONIGHT.  
 
MICHIGAN SOUTH...GALE WARNING IN EFFECT...11234 11244 11344 11334  
11324 11324 11536 11647 19757. RAIN SHOWERS TODAY THROUGH THIS  
EVENING. CHANCE OF THUNDERSTORMS EARLY THIS MORNING. WAVES 3 TO 5  
FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT TODAY. WAVES 4 TO  
7 FT OCCASIONALLY TO 9 FT BUILDING TO 7 TO 10 FT OCCASIONALLY TO  
13 FT TONIGHT.  
 

 
 
RC  
 
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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