Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 240139
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
839 PM CDT THU MAR 23 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 29.4 INCHES WILL DEVELOP OVER THE
PLAINS OVERNIGHT INTO FRIDAY. AS THIS OCCURS...A COLD FRONT WILL
GRADUALLY SHIFT SOUTHWARD DOWN THE LAKE FRIDAY BEFORE STALLING OUT
NEAR THE SOUTHERN END OF THE LAKE EARLY SATURDAY MORNING. THE LOW
WILL WEAKEN TO AROUND 29.7 INCHES AS IT MOVES SLOWLY NORTHEAST
OVER NORTHERN ILLINOIS THROUGH SUNDAY. A SECOND AREA OF LOW
PRESSURE AT 29.8 INCHES THEN QUICKLY MOVES NORTHEAST INTO MISSOURI
BY MONDAY MORNING AND THEN TO NORTHERN INDIANA TUESDAY MORNING.

LMZ261-362-364-366-563-565-567-868-240915-
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-
839 PM CDT THU MAR 23 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...SOUTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO
20 KT. SHOWERS LIKELY OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KT BECOMING WEST LATE IN THE
MORNING...THEN BECOMING NORTH 10 TO 20 KT EARLY IN THE AFTERNOON
INCREASING TO 15 TO 25 KT LATE. RAIN SHOWERS LIKELY IN THE
MORNING...THEN RAIN SHOWERS IN THE AFTERNOON. WAVES 2 TO 4 FT.
.FRIDAY NIGHT...NORTHEAST WINDS TO 30 KT. RAIN SHOWERS AND SNOW
SHOWERS LIKELY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO
4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT BECOMING EAST. CHANCE OF
RAIN SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SATURDAY NIGHT...EAST WINDS TO 30 KT. RAIN SHOWERS LIKELY. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.SUNDAY...EAST WINDS 15 TO 25 KT BECOMING NORTHEAST. RAIN LIKELY
IN THE MORNING...THEN CHANCE OF RAIN IN THE AFTERNOON. WAVES 3 TO
5 FT OCCASIONALLY TO 7 FT.
.SUNDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT. CHANCE OF RAIN AND
SNOW. WAVES 1 TO 3 FT.
.MONDAY...NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-240915-
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-
839 PM CDT THU MAR 23 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...SOUTH WINDS 15 TO 25 KT. CHANCE OF RAIN
SHOWERS AND THUNDERSTORMS THIS EVENING...THEN SLIGHT CHANCE OF
RAIN SHOWERS OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.FRIDAY...SOUTH WINDS TO 30 KT BECOMING WEST. CHANCE OF RAIN
SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.FRIDAY NIGHT...NORTH WINDS 15 TO 25 KT VEERING TO EAST TO 30 KT.
AREAS OF DENSE FOG. RAIN SHOWERS LIKELY IN THE EVENING...THEN
RAIN SHOWERS OVERNIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT
BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...EAST WINDS TO 30 KT. AREAS OF DENSE FOG. RAIN
SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY NIGHT...EAST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
AREAS OF DENSE FOG. RAIN SHOWERS LIKELY. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH 10 TO 15 KT.
AREAS OF DENSE FOG. RAIN LIKELY IN THE MORNING...THEN CHANCE OF
DRIZZLE AND RAIN IN THE AFTERNOON. WAVES 2 TO 4 FT SUBSIDING TO
1 TO 3 FT.
.SUNDAY NIGHT...NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH. AREAS
OF DENSE FOG. WAVES 1 TO 3 FT.
.MONDAY...NORTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF RAIN. WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT.

$$
LMZ761-240915-
MAFOR 2403/
MICHIGAN NORTH 12436 11426 11516 11616 11826 11836 11136.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT OVERNIGHT AND TO 2 TO 4 FT FRIDAY. WAVES 3
TO 5 FT OCCASIONALLY TO 7 FT FRIDAY EVENING.

MICHIGAN SOUTH 14430 12540 11640 11836 19834. CHANCE OF RAIN
SHOWERS OVERNIGHT AND FRIDAY. WAVES 4 TO 6 FT OCCASIONALLY TO 8
FT OVERNIGHT AND FRIDAY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT
FRIDAY 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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