Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 260100
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
800 PM CDT TUE APR 25 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...A TROUGH OF LOW PRESSURE AVERAGING 29.6 INCHES FROM
THE MID MISSOURI VALLEY TO THE SOUTHERN PLAINS WILL CONSOLIDATE
AND DEEPEN TO 29.3 INCHES AS IT MOVES NORTHEAST TO LAKE MICHIGAN
BY WEDNESDAY NIGHT. THE LOW WILL THEN SLOWLY LIFT ACROSS SOUTHEAST
CANADA FRIDAY AND FRIDAY NIGHT...WHILE A NEW TROUGH OF LOW
PRESSURE DEVELOPS ACROSS THE CENTRAL PLAINS. THIS TROUGH OF LOW
PRESSURE WILL STRENGTHEN AS IT SLOWLY MOVES NORTHEAST TOWARDS THE
GREAT LAKES REGION THROUGH THE WEEKEND.

LMZ261-362-364-366-563-565-567-868-260915-
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-
800 PM CDT TUE APR 25 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...EAST WINDS 10 TO 20 KT BECOMING SOUTHEAST AND
INCREASING TO 15 TO 25 KT. CHANCE OF RAIN SHOWERS OVERNIGHT.
WAVES 2 TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.WEDNESDAY...SOUTH WINDS TO 30 KT. SHOWERS LIKELY WITH A CHANCE
OF THUNDERSTORMS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.WEDNESDAY NIGHT...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST
10 TO 20 KT. RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
IN THE EVENING...THEN RAIN SHOWERS OVERNIGHT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO 4 FT.
.THURSDAY...WEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
RAIN SHOWERS LIKELY IN THE MORNING...THEN CHANCE OF RAIN SHOWERS
IN THE AFTERNOON. WAVES 1 TO 3 FT.
.THURSDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST.
WAVES 1 TO 3 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KT BECOMING NORTHEAST 15 TO
25 KT. WAVES 1 TO 2 FT BUILDING TO 1 TO 3 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.SUNDAY...EAST GALES TO 35 KT. RAIN SHOWERS LIKELY. WAVES 6 TO
9 FT OCCASIONALLY TO 11 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-260915-
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-
800 PM CDT TUE APR 25 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...SOUTHEAST WINDS 10 TO 20 KT INCREASING TO
15 TO 25 KT. SLIGHT CHANCE OF SHOWERS OVERNIGHT. WAVES 2 TO 4 FT
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.WEDNESDAY...SOUTH WINDS TO 30 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS IN THE MORNING...THEN SHOWERS LIKELY WITH A CHANCE
OF THUNDERSTORMS IN THE AFTERNOON. WAVES 5 TO 8 FT OCCASIONALLY
TO 10 FT.
.WEDNESDAY NIGHT...SOUTH WINDS 10 TO 20 KT. RAIN SHOWERS WITH
THUNDERSTORMS LIKELY IN THE EVENING...THEN RAIN SHOWERS LIKELY
OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO
4 FT.
.THURSDAY...WEST WINDS 10 TO 20 KT. RAIN SHOWERS LIKELY IN THE
MORNING...THEN CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES
2 TO 4 FT.
.THURSDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.
.FRIDAY...SOUTH WINDS 5 TO 10 KT BACKING TO EAST 10 TO 15 KT.
CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES 1 TO 2 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT BUILDING TO 3 TO
5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SUNDAY...EAST GALES TO 35 KT BECOMING SOUTHEAST TO 30 KT. RAIN
SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO
9 FT.

$$
LMZ761-260915-
MAFOR 2603/
MICHIGAN NORTH 11220 11320 11330 11346 13446 11436. CHANCE OF
SHOWERS LATE THIS EVENING. CHANCE OF THUNDERSTORMS WEDNESDAY AND
WEDNESDAY EVENING. WAVES 2 TO 4 FT OCCASIONALLY TO 7 FT BUILDING
TO 4 TO 7 FT OCCASIONALLY TO 9 FT OVERNIGHT. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT WEDNESDAY SUBSIDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT WEDNESDAY EVENING.

MICHIGAN SOUTH 12320 11330 11430 11440 12446 11429. CHANCE OF
SHOWERS AND THUNDERSTORMS TOWARD MORNING...THEN CHANCE OF
THUNDERSTORMS WEDNESDAY. WAVES 2 TO 4 FT OCCASIONALLY TO 7 FT
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT OVERNIGHT. WAVES 5 TO 8
FT OCCASIONALLY TO 10 FT WEDNESDAY. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT WEDNESDAY EVENING.

$$

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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