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 FRI APR 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 NEAR LAKE HURON EARLY
THIS MORNING...WILL MOVE NORTHEAST INTO QUEBEC TODAY. HIGH
PRESSURE AVERAGING 30.2 INCHES WILL BUILD ACROSS THE UPPER
MIDWEST TODAY AND THE CENTRAL PLAINS THIS WEEKEND. MEANWHILE...
LOW PRESSURE OF 30.0 INCHES WILL MOVE FROM MANITOBA TODAY TO
JAMES BAY SATURDAY...WITH A TRAILING COLD FRONT MOVING ACROSS
LAKE MICHIGAN SATURDAY NIGHT INTO SUNDAY. ANOTHER LOW OF 29.5
INCHES WILL MOVE FROM THE NORTHERN PLAINS MONDAY TO LAKE
MICHIGAN WEDNESDAY.

LMZ261-362-364-366-563-565-567-868-211400-
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-
251 AM CDT FRI APR 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...NORTHWEST WINDS TO 30 KT BECOMING NORTH 10 TO 20 KT.
SLIGHT CHANCE OF RAIN SHOWERS THIS MORNING. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 2 TO 4 FT.
.SATURDAY...NORTH WINDS 10 TO 15 KT BACKING TO SOUTHWEST. WAVES
1 TO 3 FT.
.SATURDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST.
WAVES 1 TO 3 FT.
.SUNDAY...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT BECOMING EAST. WAVES
2 TO 4 FT.
.MONDAY...SOUTHEAST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.TUESDAY...SOUTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211400-
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-
251 AM CDT FRI APR 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...NORTHWEST WINDS TO 30 KT BECOMING NORTH 15 TO 25 KT.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST. WAVES 3
TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH. WAVES
2 TO 4 FT.
.SATURDAY NIGHT...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SUNDAY...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 10 TO
15 KT. WAVES 2 TO 4 FT.
.MONDAY...SOUTHEAST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.TUESDAY...SOUTH WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.

$$

LMZ761-211400-
MAFOR 2109/
MICHIGAN NORTH 12740 11730 11830 13820 11810. CHANCE OF RAIN
SHOWERS THIS MORNING. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT TODAY. WAVES 2 TO 4
FT TONIGHT.

MICHIGAN SOUTH 11740 12730 12830 12820 11120. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT TODAY...SUBSIDING TO 3 TO 5 FT OCCASIONALLY
TO 7 FT TONIGHT.

$$

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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