763
FZUS63 KMKX 210808
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
308 AM CDT THU OCT 21 2021
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 29.7 INCHES WILL CONTINUE EASTWARD TONIGHT OVER
THE MIDDLE SECTION OF LAKE MICHIGAN, SUPPORTING WESTERLY TO
SOUTHWESTERLY WIND OVER THE SOUTHERN HALF OF THE LAKE AND
NORTHEAST WINDS OVER THE NORTHERN HALF OF THE LAKE. AS THIS LOW
EXITS EASTWARD OVER THE STATE OF MICHIGAN, NORTHEASTERLY WINDS
WILL INTENSIFY AND SURGE DOWN THE LAKE FROM NORTH TO SOUTH AS
COLD AIR ADVECTION INCREASES. ABOUT A 2 TO 5 HOUR WINDOW IS
EXPECTED FOR GALE FORCE GUSTS TO 35 KNOTS THIS MORNING INTO THE
AFTERNOON. HENCE A GALE WARNING HAS BEEN POSTED FOR THE LAKE
MICHIGAN OPEN WATERS FROM LATE TONIGHT THROUGH THURSDAY. THE WINDS
WILL GRADUALLY DIMINISH THURSDAY NIGHT AND FRIDAY.
MORE NORTHWESTERLY WINDS WILL TAKE HOLD ON FRIDAY LEADING TO SOME
LAKE EFFECT SHOWER ACTIVITY OVER THE EASTERN HALF OF THE LAKE.
SOME LOW LEVEL INSTABILITY WILL BE PRESENT SUPPORTING SOME
WATERSPOUT THREAT WITH THIS LAKE EFFECT SHOWER ACTIVITY,
ESPECIALLY OVER THE SOUTHERN END OF THE LAKE.
LMZ261-362-364-366-563-565-567-868-211530-
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-
308 AM CDT THU OCT 21 2021
SHEBOYGAN WI TO PENTWATER MI NORTH...
..GALE WARNING IN EFFECT THROUGH THIS AFTERNOON
TODAY
NORTHEAST WINDS TO 30 KT BECOMING NORTH GALES TO 40 KT,
THEN DIMINISHING TO GALES TO 35 KT LATE. CHANCE OF SHOWERS. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 10 TO 14 FT
OCCASIONALLY TO 18 FT.
TONIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.
SLIGHT CHANCE OF RAIN SHOWERS. WAVES 8 TO 12 FT OCCASIONALLY TO
16 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
FRIDAY
NORTHWEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
WAVES 3 TO 5 FT SUBSIDING TO 1 TO 2 FT.
FRIDAY NIGHT
NORTH WINDS 10 TO 15 KT BECOMING NORTHWEST.
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
SUNDAY
NORTH WINDS 10 TO 15 KT BECOMING NORTHEAST 10 TO 20 KT.
WAVES 1 TO 2 FT BUILDING TO 2 TO 4 FT.
MONDAY
EAST WINDS TO 30 KT BECOMING NORTHEAST 15 TO 25 KT.
CHANCE OF RAIN SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-211530-
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-
308 AM CDT THU OCT 21 2021
SHEBOYGAN WI TO PENTWATER MI SOUTH...
...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH
THIS EVENING...
TODAY
WEST WINDS 15 TO 25 KT INCREASING TO GALES TO 40 KT LATE
THIS MORNING, THEN BECOMING NORTHWEST EARLY THIS AFTERNOON
BECOMING NORTH GALES TO 35 KT LATE. CHANCE OF SHOWERS. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT BUILDING TO 10 TO 14 FT OCCASIONALLY TO
18 FT.
TONIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.
SLIGHT CHANCE OF RAIN SHOWERS. WAVES 10 TO 14 FT OCCASIONALLY TO
18 FT SUBSIDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.
FRIDAY
NORTH WINDS 10 TO 15 KT BECOMING NORTHWEST 5 TO 10 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.
FRIDAY NIGHT
NORTHWEST WINDS 5 TO 10 KT INCREASING TO 10 TO
15 KT. WAVES 1 TO 3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTH WINDS 5 TO 10 KT BECOMING EAST 10 TO
15 KT. WAVES 1 TO 3 FT.
SUNDAY
EAST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
CHANCE OF SHOWERS. WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT.
MONDAY
EAST WINDS TO 30 KT BECOMING NORTHEAST. CHANCE OF
SHOWERS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
LMZ761-211530-
MAFOR 2109/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11130 11146 12850 12840
11830 11820. CHANCE OF SHOWERS EARLY THIS MORNING. CHANCE OF
SHOWERS THIS AFTERNOON. WAVES 2 TO 4 FEET BUILDING TO 10 TO 13
FEET TODAY. WAVES 7 TO 11 FEET SUBSIDING TO 3 TO 6 FEET THE REST
OF TONIGHT.
MICHIGAN SOUTH...GALE WARNING IN EFFECT...11530 11630 11650 11750
11850 11840 11830 11820. CHANCE OF SHOWERS TODAY. WAVES 2 TO 4
FEET BUILDING TO 10 TO 14 FEET TODAY. WAVES 10 TO 14 FEET
SUBSIDING TO 4 TO 7 FEET THE REST OF TONIGHT.
CMILLER
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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