369
FZUS63 KMKX 191401
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
ISSUED BY NATIONAL WEATHER SERVICE GREEN BAY WI
901 AM CDT TUE AUG 19 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
WEAK LOW PRESSURE AROUND 29.9 INCHES WILL CROSS SOUTHERN LOWER
MICHIGAN TODAY. HIGH PRESSURE AROUND 30.1 INCHES SITTING OVER
ONTARIO WILL REMAIN IN PLACE THROUGH MUCH OF THE WEEK. A PERIOD OF
ELEVATED NORTHERLY WINDS IS EXPECTED TODAY, THEN LIGHT AND
VARIABLE WINDS WILL DEVELOP AS THE HIGH PRESSURE STRENGTHENS TO
30.2 INCHES AS IT GLIDES OVER LAKE MICHIGAN LATER IN THE WEEK.
LMZ261-362-364-366-563-565-567-868-192130-
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-
901 AM CDT TUE AUG 19 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TODAY
NORTHEAST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
TONIGHT
NORTHEAST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. PATCHY FOG OVERNIGHT. SLIGHT CHANCE OF SHOWERS OVERNIGHT.
WAVES 1 TO 3 FT.
WEDNESDAY
NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. CHANCE OF SHOWERS IN THE MORNING. WAVES 1 TO 3 FT BUILDING
TO 3 TO 5 FT.
WEDNESDAY NIGHT
NORTHEAST WINDS 15 TO 25 KT DIMINISHING TO
10 TO 15 KT OVERNIGHT. WAVES 3 TO 5 FT SUBSIDING TO 2 TO 4 FT.
THURSDAY
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH 10 TO
15 KT. WAVES 1 TO 2 FT.
THURSDAY NIGHT
EAST WINDS 10 TO 15 KT VEERING TO SOUTH 5 TO
10 KT. WAVES 1 TO 2 FT.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 2 FT.
SATURDAY
WEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-192130-
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-
901 AM CDT TUE AUG 19 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TODAY
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH.
ISOLATED SHOWERS THROUGH MID MORNING. WAVES 3 TO 5 FT.
TONIGHT
NORTH WINDS 10 TO 20 KT. SLIGHT CHANCE OF SHOWERS
OVERNIGHT. WAVES 3 TO 5 FT.
WEDNESDAY
NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. WAVES 3 TO 5 FT.
WEDNESDAY NIGHT
NORTH WINDS 15 TO 25 KT BECOMING EAST 10 TO
20 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
THURSDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH 10 TO
20 KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 5 TO
10 KT. WAVES 1 TO 3 FT.
FRIDAY
SOUTH WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT. WAVES
1 TO 2 FT.
SATURDAY
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST. WAVES 2 TO
4 FT.
LMZ761-192130-
MAFOR 1916/
MICHIGAN NORTH 11120 11110 12120 12110 11120 11110. A CHANCE OF
SHOWERS WEDNESDAY MORNING. WAVES 1 TO 3 FEET.
MICHIGAN SOUTH 15820 11820 11120. WAVES 2 TO 4 FEET.
WFO MKX
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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