Great Lakes Forecast
Issued by NWS

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817
FZUS63 KLOT 230140
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
840 PM CDT MON AUG 22 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
UPPER OHIO VALLEY...WITH RIDGING EXTENDING FROM QUEBEC THROUGH
THE LOWER MISSISSIPPI VALLEY. LOW PRESSURE OF 29.5 INCHES IS OVER
THE DAKOTAS WITH AN ASSOCIATED COLD FRONT EXTENDING SOUTH THROUGH
THE FRONT RANGE OF THE ROCKIES. THE CENTER OF THE HIGH IS EXPECTED
TO MOVE OFF THE MID ATLANTIC COAST TUESDAY AFTERNOON WHILE THE LOW
TRACKS TO SOUTHERN MANITOBA WITH THE COLD FRONT EXTENDING THROUGH
THE EASTERN DAKOTAS TO WESTERN KANSAS. THE MAIN LOW WILL SLOWLY
LIFT INTO WESTERN ONTARIO BY WEDNESDAY AND THE COLD FRONT MOVES TO
THE UPPER MISSISSIPPI VALLEY TO NEWLY DEVELOPING LOW PRESSURE OF
29.7 INCHES OVER THE CENTRAL PLAINS. AN AXIS OF HIGH PRESSURE WILL
REMAIN OVER THE SOUTHEASTERN STATES... BLOCKING THE PROGRESSION OF
THE SOUTHERN PORTION OF THE COLD FRONT...BUT THE NORTHERN PORTION
OF THE FRONT SHOULD FINALLY PUSH ACROSS LAKE MICHIGAN BY WEDNESDAY
NIGHT OR THURSDAY.

LMZ261-362-364-366-563-565-567-868-230915-
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-
840 PM CDT MON AUG 22 2016

SHEBOYGAN WI TO PENTWATER MI NORTH...

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

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-230915-
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-
840 PM CDT MON AUG 22 2016

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$
LMZ761-230915-
MAFOR 2303/
MICHIGAN NORTH 14540 11540 12440 11430. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT.

MICHIGAN SOUTH 11430 14530 12430 11420. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT.

$$

BMD

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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