Great Lakes Forecast
Issued by NWS

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585
FZUS63 KLOT 210754
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
254 AM CDT WED SEP 21 2016

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 HEIGHT OF THE HIGHEST 1/3 OF THE WAVES...ALONG
WITH THE AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES
WHICH WILL OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...HIGH PRESSURE OF 30.2 INCHES IS CENTERED OVER THE
EASTERN GREAT LAKES WITH A RIDGE AXIS EXTENDING SOUTHWEST INTO THE
LOWER MISSISSIPPI VALLEY. LOW PRESSURE OF 29.7 INCHES IS
DEVELOPING OVER THE WESTERN PLAINS WITH A TROUGH AND ASSOCIATED
WARM FRONT EXTENDING EAST ACROSS THE UPPER MIDWEST TO CENTRAL LAKE
MICHIGAN. THE SURFACE PRESSURE PATTERN WILL CHANGE LITTLE INTO
THURSDAY NIGHT...WITH THE EXCEPTION OF A LARGE AREA OF HIGH
PRESSURE OF 30.3 INCHES SPREADING ACROSS SOUTHERN CANADA. BY
THURSDAY NIGHT AND INTO FRIDAY...THE CANADIAN HIGH WILL STRENGTHEN
TO 30.5 INCHES AND SPREAD SOUTH ACROSS THE UPPER GREAT LAKES...
FORCING THE FRONT TO PUSH SOUTH AS A COLD FRONT. THE COLD FRONT
WILL PUSH SOUTH OF THE GREAT LAKES FRIDAY AFTERNOON WHILE WEAK
HIGH PRESSURE OF 30.0 INCHES REMAINS OVER THE SOUTHEASTERN STATES
AND A NEW LOW OF 29.4 INCHES DEVELOPS OVER THE WESTERN PLAINS.

LMZ261-362-364-366-563-565-567-868-211530-
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-
254 AM CDT WED SEP 21 2016

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...SOUTH WINDS 10 TO 15 KT BECOMING EAST. CHANCE OF SHOWERS
AND THUNDERSTORMS. WAVES 2 TO 4 FT.
.TONIGHT...EAST WINDS 10 TO 15 KT BECOMING SOUTHEAST. CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN SHOWERS AND
THUNDERSTORMS OVERNIGHT. WAVES 1 TO 3 FT.
.THURSDAY...SOUTHEAST WINDS 10 TO 15 KT BACKING TO NORTHEAST
10 TO 20 KT. SHOWERS AND THUNDERSTORMS LIKELY IN THE MORNING...
THEN CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES
1 TO 2 FT.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. SHOWERS LIKELY. WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KT. CHANCE OF SHOWERS. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SATURDAY...EAST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211530-
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-
254 AM CDT WED SEP 21 2016

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...SOUTHEAST WINDS 10 TO 15 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 2 TO 4 FT.
.TONIGHT...SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO 15 KT.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FT.
.THURSDAY...SOUTH WINDS 10 TO 15 KT BECOMING SOUTHEAST. CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE MORNING. WAVES 1 TO 2 FT.
.THURSDAY NIGHT...EAST WINDS 10 TO 20 KT BECOMING NORTHEAST.
CHANCE OF SHOWERS. WAVES 1 TO 3 FT.
.FRIDAY...NORTHEAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 2 TO 4 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT BECOMING EAST. CHANCE
OF SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...EAST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.

$$

LMZ761-211530-
MAFOR 2109/
MICHIGAN NORTH 12410 11310 12210 12219 11319. CHANCE OF SHOWERS
AND THUNDERSTORMS TODAY. WAVES 2 TO 4 FT TODAY. WAVES 1 TO 3 FT
TONIGHT.

MICHIGAN SOUTH 14310 12300 12410. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 2 TO 4 FT TODAY. WAVES 1 TO 3 FT TONIGHT.

$$

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/LOT/GLFTABLE (ALL LOWER CASE)

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT
WEATHER.GOV/GREATLAKES (ALL LOWER CASE)



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