Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 180803
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
303 AM CDT THU MAY 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 29.4 INCHES OVER WESTERN WISCONSIN
TONIGHT WILL WEAKEN TO 29.6 INCHES AS IT PASSES ACROSS THE UPPER
GREAT LAKES ON THURSDAY AFTERNOON. A COLD FRONT TRAILING FROM THE
LOW WILL PUSH SOUTH OF THE LAKE THURSDAY EVENING AS HIGH PRESSURE
OF 30.4 INCHES BUILDS ACROSS THE UPPER GREAT LAKES REGION. THE
HIGH WILL CONTINUE TO SPREAD EAST TO SOUTHERN QUEBEC AND THE
EASTERN LAKES BY SATURDAY MORNING. LOW PRESSURE OF 29.7 INCHES
FROM IOWA ON SATURDAY TO LAKE SUPERIOR ON SUNDAY. THE LOW WILL
DEEPEN TO 29.5 INCHES AS IT MOVES TO NEAR JAMES BAY ON MONDAY.

LMZ261-362-364-366-563-565-181545-
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-
303 AM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH
THIS EVENING...

.TODAY...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST TO 30 KT...THEN
BECOMING NORTHWEST GALES TO 35 KT LATE THIS MORNING. RAIN SHOWERS
LIKELY THIS MORNING...THEN CHANCE OF RAIN SHOWERS THIS AFTERNOON.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...NORTH GALES TO 35 KT BECOMING DIMINISHING TO 15 TO 25
KT AND BECOMING NORTHEAST LATE. WAVES 5 TO 8 FT OCCASIONALLY TO 9
FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT BECOMING EAST 10 TO
20 KT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO
4 FT.
.SATURDAY...EAST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS IN THE
MORNING...THEN RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
IN THE AFTERNOON. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY NIGHT...EAST WINDS TO 30 KT BECOMING SOUTH 10 TO 20 KT
OVERNIGHT. RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 2 TO
4 FT.
.MONDAY...WEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-181545-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 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 PENTWATER TO MANISTEE MI 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-
303 AM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TODAY...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO 25 KT AND
THEN VEERING TO NORTHWEST TO 30 KT LATE. CHANCE OF RAIN SHOWERS.
WAVES 4 TO 7 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.TONIGHT...NORTH WINDS TO 30 KT WITH OCCASIONAL GALE FORCE GUSTS
TO 35 KT THIS EVENING BECOMING NORTHEAST 15 TO 25 KT LATE. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.FRIDAY NIGHT...EAST WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS
OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...EAST WINDS 15 TO 25 KT BECOMING SOUTHEAST 10 TO
20 KT. CHANCE OF RAIN SHOWERS IN THE MORNING...THEN RAIN SHOWERS
LIKELY WITH A CHANCE OF THUNDERSTORMS IN THE AFTERNOON. WAVES
4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH.
CHANCE OF SHOWERS. WAVES 2 TO 4 FT.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.MONDAY...WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 1 TO
3 FT.

$$

LMZ761-181545-
MAFOR 1809/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11430 11536 11540 19750
12750 11850 11840 11830. CHANCE OF SHOWERS AND THUNDERSTORMS EARLY
THIS MORNING...THEN CHANCE OF SHOWERS TODAY. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT TODAY...5 TO 8 FT OCCASIONALLY TO 10 FT THIS
EVENING SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT TONIGHT.

MICHIGAN SOUTH 11440 12530 11630 11740 12840 19850 11840. CHANCE
OF SHOWERS TODAY. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING
TO 3 TO 5 FT OCCASIONALLY TO 7 FT TODAY. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT TONIGHT.

$$

RC

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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