Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 190145
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
845 PM CDT TUE APR 18 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 29.8 INCHES OVER WESTERN LAKE
SUPERIOR...WILL MOVE INTO WESTERN QUEBEC WEDNESDAY AS IT SLOWLY
WEAKENS. A TRAILING COLD FRONT WILL MOVE SOUTH ACROSS THE LAKE
OVERNIGHT INTO WEDNESDAY MORNING. HIGH PRESSURE OF 30.4 INCHES
WILL BUILD ACROSS CENTRAL CANADA AND NEW LOW PRESSURE OF 29.6
INCHES WILL DEVELOP OVER THE CENTRAL PLAINS. THIS LOW WILL PASS
OVER CENTRAL LAKE MICHIGAN THURSDAY MORNING WHILE HIGH PRESSURE
OF 30.3 INCHES SPREADS ACROSS THE NORTHERN AND CENTRAL PLAINS.

LMZ261-362-364-366-563-565-567-868-190800-
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-
845 PM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

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

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190800-
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-
845 PM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$
LMZ761-190800-
MAFOR 1903/
MICHIGAN NORTH 11430 11530 11620 11720 12820 11830 11146.
CHANCE OF RAIN SHOWERS TONIGHT AND WEDNESDAY AFTERNOON. WAVES 4
TO 7 FT OCCASIONALLY TO 9 FT TONIGHT...SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT WEDNESDAY.

MICHIGAN SOUTH 12430 11530 19720 11720 13830 11140. CHANCE OF
RAIN SHOWERS. CHANCE OF THUNDERSTORMS WEDNESDAY AND WEDNESDAY
EVENING. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO
5 FT OCCASIONALLY TO 7 FT TONIGHT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT WEDNESDAY.

$$

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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