Great Lakes Forecast
Issued by NWS

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487
FZUS63 KLOT 280008 AAA
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN...UPDATED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
708 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 29.3 INCHES OVER EASTERN LAKE SUPERIOR
WILL CONTINUE 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 INTO IOWA
SUNDAY NIGHT...AND TO 29.2 INCHES AS IT MOVES TO THE NORTHERN
GREAT LAKES ON MONDAY. A TRAILING COLD FRONT WILL MOVE ACROSS THE
LAKE MONDAY NIGHT WHILE THE LOW MOVES TO QUEBEC TUESDAY.

LMZ261-362-364-366-563-565-567-868-280315-
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-
708 PM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT SUBSIDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT.
.FRIDAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.FRIDAY NIGHT...WEST WINDS 10 TO 15 KT VEERING TO NORTH 10 TO
20 KT LATE IN THE EVENING...THEN INCREASING TO 30 KT AFTER
MIDNIGHT BECOMING NORTH TO 30 KT LATE. CHANCE OF RAIN SHOWERS IN
THE EVENING. WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.
.SATURDAY...NORTH WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT. CHANCE OF RAIN
SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY...EAST GALES TO 35 KT BECOMING NORTHEAST. RAIN SHOWERS IN
THE MORNING...THEN RAIN SHOWERS LIKELY IN THE AFTERNOON. WAVES
BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11 FT.
.SUNDAY NIGHT...NORTHEAST GALES TO 35 KT BECOMING EAST TO 30 KT.
RAIN SHOWERS. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.MONDAY...SOUTHEAST WINDS TO 30 KT BECOMING SOUTH. CHANCE OF RAIN
SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 5 TO
8 FT OCCASIONALLY TO 10 FT.
.TUESDAY...WEST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS. WAVES
6 TO 9 FT OCCASIONALLY TO 11 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-280315-
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-
708 PM CDT THU APR 27 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 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 IN THE AFTERNOON. WAVES 1 TO 3 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH TO
30 KT. CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES 1 TO 3 FT
BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT BECOMING EAST GALES TO
35 KT. RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN SHOWERS
OVERNIGHT. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.SUNDAY...EAST WINDS TO 30 KT. RAIN SHOWERS WITH A CHANCE OF
THUNDERSTORMS IN THE MORNING...THEN RAIN SHOWERS IN THE
AFTERNOON. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO
4 TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY NIGHT...EAST WINDS TO 30 KT BECOMING SOUTHEAST. RAIN
SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 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.
.TUESDAY...WEST GALES TO 35 KT DIMINISHING TO 30 KT. WAVES 6 TO
9 FT OCCASIONALLY TO 11 FT.

$$
LMZ761-280315-
MAFOR 2800 AMD/
MICHIGAN NORTH 11540 14530 11530 11520. 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 SUBSIDING TO 2 TO 4
FT FRIDAY.

MICHIGAN SOUTH 10530 14520 11510 11310 11210. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT TONIGHT. WAVES 1 TO 3
FT FRIDAY.

$$

IZZI

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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