Great Lakes Forecast
Issued by NWS

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114
FZUS63 KLOT 230155
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
855 PM CDT SAT APR 22 2017

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 AVERAGING 30.2 INCHES FROM THE CENTRAL
PLAINS TO THE SOUTHWEST GREAT LAKES WILL WEAKEN INTO SUNDAY...
WHILE AN AREA OF LOW PRESSURE OF 29.4 INCHES MOVES NORTHEASTERN
ONTARIO INTO QUEBEC. A WEAK COLD FRONT TRAILING FROM THIS LOW WILL
SAG ACROSS LAKE MICHIGAN SUNDAY. ANOTHER LOW OF 29.4 INCHES WILL
MOVE FROM THE NORTHERN PLAINS MONDAY TO LAKE SUPERIOR TUESDAY AND
FILL. LOW PRESSURE OF 29.4 INCHES OVER THE CENTRAL PLAINS TUESDAY
WILL MOVE NORTHEAST TO LAKE MICHIGAN WEDNESDAY.

LMZ261-362-364-366-563-565-567-669-868-870-230915-
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 SHEBOYGAN TO PORT WASHINGTON WI 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-
855 PM CDT SAT APR 22 2017

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

.REST OF TONIGHT...SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SUNDAY...NORTH WINDS 10 TO 20 KT VEERING TO NORTHEAST 15 TO 25
KT. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT BECOMING EAST. WAVES
2 TO 4 FT.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES
2 TO 4 FT BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.TUESDAY...SOUTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TUESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KT BECOMING EAST 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT.
.WEDNESDAY...EAST WINDS 15 TO 25 KT BACKING TO NORTH TO 30 KT.
RAIN SHOWERS LIKELY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.THURSDAY...NORTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.

$$

LMZ080-671-673-675-777-779-872-874-876-878-230915-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-
855 PM CDT SAT APR 22 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TONIGHT...VARIABLE WINDS 5 TO 10 KT BECOMING SOUTHWEST.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.SUNDAY...SOUTHWEST WINDS AROUND 10 KT BACKING TO SOUTH. WAVES 1
TO 3 FT.
.SUNDAY NIGHT...EAST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
.MONDAY...SOUTHEAST WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 1 TO 3 FT.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KT. WAVES 1 TO 3 FT
BUILDING TO 2 TO 4 FT.
.TUESDAY...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHEAST 10 TO
20 KT. WAVES 2 TO 4 FT.
.TUESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT BUILDING TO 2 TO
4 FT.
.WEDNESDAY...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST. CHANCE
OF RAIN SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO
20 KT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO
4 FT.

$$
LMZ761-230915-
MAFOR 2303/
MICHIGAN NORTH 13520 11620 11820 11830 11130 11120. WAVES 2 TO 4
FT.

MICHIGAN SOUTH 12910 13510 11520 11320 11220. WAVES 2 TO 4 FT
SUBSIDING TO 1 TO 3 FT OVERNIGHT AND CONTINUING SUNDAY.

$$

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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