Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 210751
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
251 AM 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 NORTHWESTERN IOWA
WILL MOVE TO NORTHWEST WISCONSIN BY LATE SUNDAY MORNING THEN
DEEPEN TO 29.6 INCHES AS IT CROSSES CENTRAL LAKE SUPERIOR INTO
MONDAY MORNING. A COLD FRONT WILL CROSS LAKE MICHIGAN TONIGHT
TURNING WINDS FROM EAST AND SOUTHEAST TO SOUTHWESTERLY. ANOTHER
LOW PRESSURE SYSTEM WILL DEVELOP ACROSS LAKE MICHIGAN LATER
TUESDAY TRANSITIONING WINDS TO VARIABLE AND THEN NORTH AND
NORTHEAST BY WEDNESDAY.

LMZ261-362-211530-
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-
251 AM CDT SUN MAY 21 2017

ROCK ISLAND PASSAGE TO CHARLEVOIX MI NORTH...

.TODAY...EAST WINDS 20 TO 25 KT DIMINISHING TO 10 TO 15 KT EARLY
IN THE AFTERNOON...THEN VEERING TO SOUTH TOWARD EVENING. AREAS OF
FOG. CHANCE OF SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT LATE.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 30 KT.
CHANCE OF SHOWERS OVERNIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7
FT.
.MONDAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 15 KT BECOMING SOUTHEAST
LESS THAN 10 KT OVERNIGHT. WAVES SUBSIDING TO 1 TO 2 FT.
.TUESDAY...NORTHEAST WINDS 10 TO 15 KT. CHANCE OF SHOWERS. WAVES
1 TO 2 FT.
.TUESDAY NIGHT THROUGH THURSDAY...NORTH WINDS 10 TO 20 KT
BECOMING NORTHEAST. CHANCE OF RAIN SHOWERS TUESDAY NIGHT. WAVES 1
TO 3 FT.

$$

LMZ364-366-563-565-567-669-868-870-211530-
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-
251 AM CDT SUN MAY 21 2017

ROCK ISLAND PASSAGE TO CHARLEVOIX MI SOUTH TO PORT WASHINGTON WI
TO WHITEHALL MI...

.TODAY...EAST WINDS 10 TO 20 KT BECOMING SOUTH THIS AFTERNOON.
CHANCE OF SHOWERS THIS MORNING. AREAS OF FOG THIS MORNING. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 30 KT LATE
IN THE EVENING...DIMINISHING TO 15 TO 25 KT LATE. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.MONDAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH. CHANCE OF
RAIN SHOWERS IN THE MORNING. WAVES 3 TO 5 FT OCCASIONALLY TO
7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH 10 TO
15 KT. CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT SUBSIDING TO 1 TO
3 FT.
.TUESDAY...NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH. CHANCE OF
RAIN SHOWERS. WAVES 1 TO 2 FT.
.TUESDAY NIGHT THROUGH THURSDAY...NORTH WINDS 10 TO 20 KT. CHANCE
OF RAIN SHOWERS TUESDAY NIGHT. WAVES 2 TO 4 FT.

$$

LMZ080-671-673-675-777-779-872-874-876-878-211530-
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-
251 AM CDT SUN MAY 21 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.TODAY...SOUTHEAST WINDS 10 TO 20 KT SHIFTING TO SOUTHWEST EARLY
THIS MORNING. AREAS OF FOG AND CHANCE OF SHOWERS THIS MORNING.
WAVES 1 TO 3 FT.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 30 KT. WAVES
2 TO 4 FT BUILDING TO 3 TO 6 FT OCCASIONALLY TO 8 FT.
.MONDAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF SHOWERS.
WAVES 2 TO 4 FT.
.TUESDAY...SOUTHWEST WINDS 10 TO 15 KT BECOMING WEST. CHANCE OF
RAIN SHOWERS. WAVES 1 TO 2 FT.
.TUESDAY NIGHT THROUGH THURSDAY...NORTH WINDS 10 TO 20 KT. CHANCE
OF RAIN SHOWERS TUESDAY NIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7
FT.

$$

LMZ761-211530-
MAFOR 2109/
MICHIGAN FAR NORTH 13230 11210 11410 12520 11530. CHANCE OF
SHOWERS. AREAS OF FOG. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT LATE AFTERNOON AND
CONTINUING TONIGHT.

MICHIGAN CENTRAL 12220 11320 12420 11520 11530 11540. AREAS OF
FOG WITH A CHANCE OF SHOWERS THIS MORNING. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.

MICHIGAN SOUTH 11323 15520 11530. AREAS OF FOG AND CHANCE OF
SHOWERS THIS MORNING. WAVES 1 TO 3 FT TODAY AND 2 TO 4 FT BUILDING
TO 3 TO 6 FT OCCASIONALLY TO 8 FT TONIGHT.

$$

- IZZI

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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