Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 270755
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
255 AM 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...BROAD LOW PRESSURE OF 29.4 INCHES OVER LAKE MICHIGAN
EARLY THIS MORNING WILL CONSOLIDATE AND DEEPEN TO 29.2 INCHES AS
IT REACHES EASTERN LAKE SUPERIOR THIS AFTERNOON. THIS LOW WILL
BEGIN TO SLOWLY FILL AS IT LIFTS NORTHEAST 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.

LMZ261-362-364-366-563-565-567-868-271400-
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-
255 AM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...NORTHEAST WINDS 10 TO 20 KT VEERING TO SOUTHWEST TO
30 KT FROM LATE MORNING ON. AREAS OF FOG THIS MORNING. RAIN
LIKELY THIS MORNING...THEN CHANCE OF RAIN THIS AFTERNOON. WAVES
2 TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST. SLIGHT
CHANCE OF RAIN IN THE EVENING. WAVES 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-271400-
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-
255 AM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTHWEST TO 30
KT THIS MORNING. OCCASIONAL GALE GUSTS TO 35 KT POSSIBLE THIS
MORNING. AREAS OF FOG THIS MORNING. RAIN LIKELY THIS MORNING.
WAVES 2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 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.

$$

LMZ761-271400-
MAFOR 2709/
MICHIGAN NORTH 12126 11546 12540 13530. AREAS OF FOG THIS
MORNING. CHANCE OF RAIN TODAY. WAVES 2 TO 4 FT BUILDING TO 4 TO
7 FT OCCASIONALLY TO 9 FT TODAY. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT TONIGHT.

MICHIGAN SOUTH 11326 12546 19550 12540 13520. AREAS OF FOG THIS
MORNING. WAVES 2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO
10 FT TODAY. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2
TO 4 FT TONIGHT.

$$

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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