Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 180152
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
852 PM CDT MON APR 17 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 NORTHERN
GREAT LAKES AND EXTENDING TO JAMES BAY WILL SHIFT TO THE CANADIAN
MARITIMES ON WENDESDAY. LOW PRESSURE OF 29.6 INCHES WILL MOVE OUT
OF THE NORTHERN ROCKIES AND INTO THE DAKOTAS TONIGHT AND TRACK
EAST TO LAKE SUPERIOR BY TUESDAY EVENING. THE LOW WILL CONTINUE
EAST INTO SOUTHERN ONTARIO TUESDAY NIGHT...DRAGGING ANOTHER COLD
FRONT ACROSS THE LAKE. THE COLD FRONT SHOULD PUSH SOUTH OF THE
LAKE BY WEDNESDAY MORNING WHILE HIGH PRESSURE OF 30.4 INCHES
BUILDS ACROSS CENTRAL CANADA AND NEW LOW PRESSURE OF 29.6 INCHES
DEVELOPS OVER THE CENTRAL PLAINS. THIS LOW WILL PASS OVER SOUTHERN
LAKE MICHIGAN THURSDAY MORNING WHILE THE HIGH HOLDS OVER A BROAD
AREA FROM JAMES BAY TO THE CENTRAL PLAINS.

LMZ261-362-364-366-563-565-567-868-180800-
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-
852 PM CDT MON APR 17 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...NORTHEAST WINDS 10 TO 15 KT BECOMING EAST 10
TO 20 KT. WAVES 2 TO 4 FT.
.TUESDAY...SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH 15 TO 25
KT. CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES BUILDING TO 4
TO 6 FT OCCASIONALLY TO 8 FT.
.TUESDAY NIGHT...SOUTHWEST WINDS TO 30 KT BECOMING WEST 10 TO 20
KT LATE. CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO 4 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT. CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. WAVES BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS TO 30 KT. RAIN SHOWERS. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT.
.THURSDAY...NORTHEAST WINDS TO 30 KT. RAIN SHOWERS LIKELY. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.
.THURSDAY NIGHT...NORTH WINDS 15 TO 25 KT. CHANCE OF RAIN
SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...NORTH WINDS 15 TO 25 KT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT.
.SATURDAY...NORTHEAST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180800-
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-
852 PM CDT MON APR 17 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$

LMZ761-180800-
MAFOR 1803/
MICHIGAN NORTH 11110 12220 11320 11330 12430 11440. CHANCE OF
RAIN SHOWERS TUESDAY AND TUESDAY EVENING. WAVES 2 TO 4 FT
TONIGHT...BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT TUESDAY.

MICHIGAN SOUTH 12120 11220 11320 11330 13430. CHANCE OF SHOWERS
TUESDAY EVENING. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING
TO 2 TO 4 FT TONIGHT...BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7
FT TUESDAY.

$$

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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