Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 271918 AAA
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN...UPDATED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
218 PM CDT THU APR 27 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 29.2 INCHES OVER CENTRAL LAKE MICHIGAN
WILL MOVE TO EASTERN LAKE SUPERIOR BY MIDDAY. THIS LOW WILL THEN
BEGIN TO SLOWLY FILL AS IT TRACKS INTO ONTARIO THIS EVENING. WEAK
HIGH PRESSURE OF 29.9 INCHES WILL DEVELOP ACROSS THE LAKE FRIDAY
AS THE LOW CONTINUES TO MOVE AWAY TO THE NORTH. LOW PRESSURE OF
29.5 INCHES WILL DEVELOP OVER THE SOUTHERN PLAINS SATURDAY AND
WILL DEEPEN TO 29.3 INCHES AS IT LIFTS NORTHEAST INTO IOWA SUNDAY
NIGHT...AND TO 29.2 INCHES AS IT MOVES TO THE NORTHERN GREAT LAKES
ON MONDAY.

LMZ261-362-364-366-563-565-567-868-272115-
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-
218 PM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.THIS AFTERNOON...SOUTHWEST GALES TO 40 KT WITH OCCASIONAL GUSTS
TO 45 KT. A CHANCE OF RAIN. WAVES 6 TO 9 FT OCCASIONALLY TO 11
FT.
.TONIGHT...SOUTHWEST WINDS TO 30 KT EARLY DIMINISHING TO 15 TO 25
KT...THEN BECOMING WEST AFTER MIDNIGHT. SLIGHT CHANCE OF RAIN IN
THE EVENING. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4
TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.FRIDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. WAVES 2 TO 4 FT.
.SATURDAY...NORTH WINDS 15 TO 25 KT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT. WAVES 3 TO 6 FT
OCCASIONALLY TO 8 FT.
.SUNDAY...EAST WINDS TO 30 KT BECOMING NORTHEAST GALES TO 35 KT.
RAIN SHOWERS LIKELY. WAVES BUILDING TO 6 TO 9 FT OCCASIONALLY TO
11 FT.
.MONDAY...SOUTHEAST WINDS TO 30 KT BECOMING SOUTHWEST GALES TO
35 KT. CHANCE OF RAIN SHOWERS. WAVES 5 TO 8 FT OCCASIONALLY TO
10 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-272115-
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-
218 PM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.THIS AFTERNOON...SOUTHWEST WINDS TO 30 KT. A CHANCE OF SHOWERS.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KT BACKING TO NORTHEAST.
CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES 1 TO 3 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES BUILDING TO
3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...NORTH WINDS TO 30 KT. CHANCE OF RAIN SHOWERS IN THE
AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT BECOMING EAST. RAIN
SHOWERS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.SUNDAY...EAST WINDS TO 30 KT. RAIN SHOWERS WITH A CHANCE OF
THUNDERSTORMS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.MONDAY...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST GALES TO 35 KT.
CHANCE OF RAIN SHOWERS. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.

$$
LMZ761-272115-
MAFOR 2718 AMD/
MICHIGAN NORTH...GALE WARNING IN EFFECT...12550 19560 11540 11530
12630 11530. CHANCE OF RAIN LATE AFTERNOON. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
TONIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT FRIDAY MORNING.

MICHIGAN SOUTH 12540 14520 11510. CHANCE OF SHOWERS THIS MORNING.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT TODAY. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT THIS EVENING SUBSIDING TO 2 TO 4 FT AFTER
MIDNIGHT...FURTHER SUBSIDING TO 1 TO 3 FT FRIDAY MORNING.

$$

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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