Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 170122
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
822 PM CDT THU MAR 16 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...HIGH PRESSURE OF 30.4 INCHES ACROSS THE CENTRAL GREAT
LAKES TO SOUTHEAST U.S. WILL SHIFT EAST OVERNIGHT. LOW PRESSURE
OF 29.7 INCHES OVER SOUTHERN MANITOBA WILL TRACK TO LAKE SUPERIOR
BY FRIDAY EVENING AND WEAKEN TO 29.8 INCHES AS IT DOES. THE LOW
WILL AVERAGE 29.9 INCHES AS IT DROPS SOUTHEAST OVER THE GREAT
LAKES FRIDAY NIGHT. HIGH PRESSURE OF 30.4 INCHES WILL SPREAD
ACROSS THE WESTERN LAKES AGAIN SATURDAY NIGHT INTO EARLY SUNDAY. A
LARGE SURFACE LOW WILL DEEPEN TO AROUND 28.9 INCHES AS IT REACHES
HUDSON BAY SUNDAY NIGHT AND ITS COLD FRONT WILL PASS OVER THE
LAKE MONDAY.

LMZ261-362-364-366-563-565-567-868-170930-
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-
822 PM CDT THU MAR 16 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

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

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-170930-
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-
822 PM CDT THU MAR 16 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$
LMZ761-170930-
MAFOR 1703/
MICHIGAN NORTH 11520 11430 11440 13347 11437 11427. WAVES 3 TO 5
FT OCCASIONALLY TO 7 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8
FT TONIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT FRIDAY MORNING
SUBSIDING TO 3 TO 6 FT OCCASIONALLY TO 8 FT LATE FRIDAY AFTERNOON.

MICHIGAN SOUTH 11420 11337 11347 12346 11440 11530 11630. CHANCE
OF SNOW FRIDAY MORNING. CHANCE OF RAIN SHOWERS FRIDAY AFTERNOON
AND EVENING. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO 4 TO
6 FT OCCASIONALLY TO 8 FT TONIGHT. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT FRIDAY MORNING SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7
FT FRIDAY AFTERNOON....FURTHER SUBSIDING TO 2 TO 4 FT EARLY FRIDAY
EVENING.

$$

MTF

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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