Great Lakes Forecast
Issued by NWS

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390
FZUS63 KLOT 212000
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
300 PM CDT SUN MAY 21 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...LOW PRESSURE OF 29.7 INCHES OVER THE U P OF MICHIGAN
WILL DEEPEN TO 29.6 INCHES AS IT CROSSES CENTRAL LAKE SUPERIOR
INTO MONDAY MORNING. A COLD FRONT TRAILING FROM THIS LOW WILL
CONTINUE TO CROSS LAKE MICHIGAN INTO THIS EVENING. ANOTHER WEAK
LOW AROUND 29.7 INCHES WILL FORM OVER THE UPPER MISSISSIPPI
VALLEY ON MONDAY EVENING AND MEANDER ACROSS THE WESTERN AND
CENTRAL GREAT LAKES THROUGH MID WEEK WHILE SLOWLY DEEPENING. WEAK
HIGH PRESSURE RIDGING AROUND 29.9 INCHES WILL BE OVER THE GREAT
LAKES ON FRIDAY.

LMZ261-362-364-366-563-565-220330-
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-
300 PM CDT SUN MAY 21 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.TONIGHT...SOUTHWEST WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS
OVERNIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY...SOUTHWEST WINDS 20 TO 25 KT DIMINISHING TO 10 TO 20 KT.
CHANCE OF RAIN SHOWERS IN THE MORNING...THEN SLIGHT CHANCE OF
RAIN SHOWERS IN THE AFTERNOON. WAVES 3 TO 5 FT OCCASIONALLY TO 7
FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH 10 TO
15 KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.TUESDAY...SOUTHEAST WINDS 10 TO 15 KT BECOMING EAST. CHANCE OF
RAIN SHOWERS. WAVES 1 TO 2 FT.
.TUESDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT. CHANCE OF RAIN
SHOWERS. WAVES 1 TO 3 FT.
.WEDNESDAY...NORTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT BECOMING NORTH.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.THURSDAY...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.FRIDAY...NORTHWEST WINDS 5 TO 10 KT BACKING TO SOUTHWEST. WAVES
1 FT OR LESS.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-220330-
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-
300 PM CDT SUN MAY 21 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TONIGHT...SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 20 TO 25 KT
AND BECOMING WEST. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.MONDAY...SOUTHWEST WINDS 20 TO 25 KT BECOMING SOUTH 15 TO 25 KT.
SLIGHT CHANCE OF RAIN SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH.
CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.TUESDAY...SOUTH WINDS 10 TO 15 KT BECOMING SOUTHEAST. CHANCE OF
RAIN SHOWERS IN THE MORNING...THEN RAIN SHOWERS LIKELY IN THE
AFTERNOON. WAVES 1 TO 2 FT.
.TUESDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT. CHANCE OF RAIN
SHOWERS. WAVES 1 TO 3 FT.
.WEDNESDAY...NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT.
.WEDNESDAY NIGHT...NORTH WINDS 15 TO 25 KT. CHANCE OF RAIN
SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...NORTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KT BACKING TO SOUTHEAST 10 TO
20 KT. WAVES 1 TO 2 FT.

$$

LMZ761-220330-
MAFOR 2121/
MICHIGAN NORTH 11530 19320 11530 15530. CHANCE OF SHOWERS
OVERNIGHT AND MONDAY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.

MICHIGAN SOUTH 11520 12530 12630 12530 11430. WAVES 2 TO 4 FT
BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT TONIGHT. WAVES 4 TO 6
FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7
FT MONDAY.

$$

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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