Great Lakes Forecast
Issued by NWS

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192
FZUS63 KLOT 260755
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
255 AM CDT WED APR 26 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...A TROUGH OF LOW PRESSURE AVERAGING 29.6 INCHES FROM
THE MID MISSOURI VALLEY TO THE SOUTHERN PLAINS WILL CONSOLIDATE
AND DEEPEN TO 29.3 INCHES AS IT MOVES NORTHEAST TO LAKE MICHIGAN
BY TONIGHT. THE LOW WILL THEN SLOWLY LIFT ACROSS SOUTHEAST CANADA
FRIDAY AND FRIDAY NIGHT...WHILE A NEW TROUGH OF LOW PRESSURE
DEVELOPS ACROSS THE CENTRAL PLAINS. THIS TROUGH OF LOW PRESSURE
WILL STRENGTHEN AS IT SLOWLY MOVES NORTHEAST TOWARDS THE GREAT
LAKES REGION THROUGH THE WEEKEND.

LMZ261-362-364-366-563-565-567-868-261400-
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 WED APR 26 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...SOUTHEAST WINDS 20 TO 25 KT BECOMING SOUTH. CHANCE OF
RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS THIS MORNING...
THEN CHANCE OF RAIN SHOWERS AND THUNDERSTORMS THIS AFTERNOON.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO 5 TO 7 FT
OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHEAST. RAIN
SHOWERS. WAVES 5 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO
4 FT.
.THURSDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST 20 TO 25
KT. RAIN SHOWERS LIKELY IN THE MORNING...THEN CHANCE OF RAIN
SHOWERS IN THE AFTERNOON. WAVES 2 TO 4 FT.
.THURSDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KT. WAVES 2 TO 4 FT.
.FRIDAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 2 TO 4 FT.
.FRIDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT.
.SATURDAY...NORTH WINDS 15 TO 25 KT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT.
.SUNDAY...EAST WINDS TO 30 KT BECOMING NORTHEAST GALES TO 35 KT.
RAIN SHOWERS LIKELY. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-261400-
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 WED APR 26 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...SOUTHEAST WINDS TO 30 KT BECOMING SOUTH 15 TO 25 KT.
CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS THIS
MORNING...THEN RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
THIS AFTERNOON. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO
4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTH WINDS 15 TO 25 KT. SHOWERS WITH A CHANCE OF
THUNDERSTORMS IN THE EVENING...THEN SHOWERS LIKELY WITH SLIGHT
CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT SUBSIDING TO 2 TO 4 FT.
.THURSDAY...SOUTHWEST WINDS 15 TO 25 KT. RAIN SHOWERS LIKELY IN
THE MORNING. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.THURSDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST.
WAVES 2 TO 4 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KT BACKING TO EAST. CHANCE OF
RAIN SHOWERS IN THE AFTERNOON. WAVES 1 TO 3 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 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.
.SUNDAY...EAST GALES TO 35 KT DIMINISHING TO 30 KT. RAIN SHOWERS
WITH A CHANCE OF THUNDERSTORMS. WAVES 6 TO 9 FT OCCASIONALLY TO
11 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.

$$

LMZ761-261400-
MAFOR 2609/
MICHIGAN NORTH 13330 12430 11426 12326. CHANCE OF SHOWERS TODAY.
CHANCE OF THUNDERSTORMS THIS AFTERNOON. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT BUILDING TO 5 TO 7 FT OCCASIONALLY TO 9 FT
TODAY...SUBSIDING TO 2 TO 4 FT TONIGHT.

MICHIGAN SOUTH 13330 19340 11436 14436. CHANCE OF THUNDERSTORMS
THIS AFTERNOON AND THIS EVENING. WAVES 3 TO 5 FT OCCASIONALLY TO
7 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT TODAY...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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