Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 231359
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
859 AM CDT TUE AUG 23 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 AROUND 30.3 INCHES CENTERED OVER THE MID
ATLANTIC COAST WILL CONTINUE TO VERY SLOWLY SLIDE EAST OFF THE
COAST WHILE RIDGING EXTENDS SOUTHWEST THROUGH THE LOWER
MISSISSIPPI VALLEY. MEANWHILE...LOW PRESSURE OF 29.5 INCHES OVER
THE DAKOTAS WILL GRADUALLY TRACK TO EASTERN ONTARIO BY EARLY
THURSDAY MORNING. AN ASSOCIATED COLD FRONT WILL THEN SWEEP ACROSS
LAKE MICHIGAN BY THURSDAY MORNING. ANOTHER HIGH AROUND 30.2 INCHES
IS THEN FORECAST TO BUILD OVER THE WESTERN LAKES REGION BY FRIDAY
EVENING.

LMZ261-362-364-366-563-565-567-669-671-868-870-872-232115-
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 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 PENTWATER TO MANISTEE MI 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-
859 AM CDT TUE AUG 23 2016

NORTH POINT LIGHT WI TO GRAND HAVEN MI NORTH...

.REST OF TODAY...SOUTHWEST WINDS TO 30 KT BECOMING SOUTH. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTH WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.WEDNESDAY...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO 25 KT.
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE MORNING... THEN
SHOWERS AND THUNDERSTORMS LIKELY IN THE AFTERNOON. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST
10 TO 15 KT. CHANCE OF SHOWERS IN THE EVENING. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.THURSDAY...WEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
.THURSDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. WAVES 2 TO 4 FT.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 10 TO 15 KT.
WAVES 2 TO 4 FT.
.SATURDAY...SOUTHEAST WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.

$$

LMZ080-673-675-777-779-874-876-878-232115-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-
859 AM CDT TUE AUG 23 2016

NORTH POINT LIGHT WI TO GRAND HAVEN MI SOUTH...

.REST OF TODAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH.
WAVES 3 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...SOUTH WINDS 15 TO 25 KT. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS OVERNIGHT. WAVES 3 TO 6 FT OCCASIONALLY TO 8 FT.
.WEDNESDAY...SOUTH WINDS 15 TO 250 KT BECOMING SOUTHWEST. SHOWERS
AND THUNDERSTORMS LIKELY IN THE MORNING...THEN CHANCE OF SHOWERS
AND THUNDERSTORMS IN THE AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO
10 TO 15 KT. SHOWERS AND THUNDERSTORMS LIKELY IN THE EVENING...
THEN CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT. WAVES 2 TO
4 FT.
.THURSDAY...WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
WAVES 1 TO 2 FT.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KT BECOMING NORTHWEST.
WAVES 2 TO 4 FT.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 10 TO 15 KT.
WAVES 2 TO 4 FT.
.SATURDAY...SOUTHEAST WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.

$$

LMZ761-232115-
MAFOR 2315/
MICHIGAN NORTH 12540 15440. CHANCE OF SHOWERS AND THUNDERSTORMS
WEDNESDAY MORNING. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.

MICHIGAN SOUTH 12530 14430 11430 11439. WAVES 3 TO 6 FT
OCCASIONALLY TO 8 FT TODAY AND TONIGHT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT WEDNESDAY MORNING.

$$

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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