Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 210140
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
840 PM CDT SAT AUG 20 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...AN AREA OF LOW PRESSURE OF 29.4 INCHES OVER THE UPPER
PENINSULA OF MICHIGAN WILL LIFT NORTHEAST AND DEEPEN TO 29.3
INCHES AS IT MOVES NORTHEAST TOWARD JAMES BAY. A STRONG COLD FRONT
HAS SWEPT ACROSS LAKE MICHIGAN WITH HIGH PRESSURE THEN BUILDING
IN FROM THE WEST AVERAGING 30.1 INCHES AND BECOMING CENTERED OVER
THE UPPER MIDWEST AND PLAINS SUNDAY MORNING. THE HIGH WILL DRIFT
EAST TO THE ATLANTIC SEABOARD BY LATE TUESDAY. LOW PRESSURE OF
29.7 INCHES WILL CROSS NORTHERN LAKE MICHIGAN LATER IN THE WEEK.

LMZ261-362-364-563-210930-
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 ROCK ISLAND PASSAGE TO STURGEON BAY WI-
840 PM CDT SAT AUG 20 2016

STURGEON BAY WI TO POINT BETSIE MI NORTH...

...GALE WARNING IN EFFECT THROUGH SUNDAY MORNING...

.REST OF TONIGHT...WEST WINDS TO 30 KT BECOMING NORTHWEST GALES
TO 35 KT. CHANCE OF SHOWERS. WAVES 6 TO 9 FT OCCASIONALLY TO 11
FT.
.SUNDAY...NORTHWEST GALES TO 35 KT DIMINISHING TO 15 TO 20 KT.
CHANCE OF WATERSPOUTS. CHANCE OF SHOWERS. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO
7 FT.
.SUNDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 10 TO
15 KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.MONDAY...WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST TO 30 KT IN
THE AFTERNOON. WAVES 1 TO 2 FT BUILDING TO 3 TO 5 FT OCCASIONALLY
TO 7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS TO 30 KT. CHANCE OF SHOWERS
OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TUESDAY...SOUTHWEST WINDS TO 30 KT. WAVES 5 TO 8 FT OCCASIONALLY
TO 10 FT.
.TUESDAY NIGHT...SOUTHWEST WINDS TO 30 KT BECOMING SOUTH 15 TO
25 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 4 TO
6 FT OCCASIONALLY TO 8 FT.
.WEDNESDAY...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST. CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES 3 TO 5 FT OCCASIONALLY TO
7 FT.
.THURSDAY...WEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.

$$

LMZ366-565-567-868-210930-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
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 SAT AUG 20 2016

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO SHEBOYGAN WI TO
PENTWATER MI...

.REST OF TONIGHT...WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.
.SUNDAY...NORTHWEST WINDS 20 TO 25 KT DIMINISHING TO 15 TO 20 KT.
CHANCE OF WATERSPOUTS. CHANCE OF SHOWERS. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 5 TO
10 KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.
.MONDAY...WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 15 TO 25 KT
IN THE AFTERNOON. WAVES 1 TO 2 FT BUILDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KT. CHANCE OF SHOWERS
OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TUESDAY...SOUTHWEST WINDS TO 30 KT BECOMING SOUTH. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT.
.TUESDAY NIGHT...SOUTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.WEDNESDAY...SOUTH WINDS 15 TO 25 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...WEST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210930-
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 SAT AUG 20 2016

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$
LMZ761-210930-
MAFOR 2103/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11640 13750 11740
11730 12720. CHANCE OF SHOWERS OVERNIGHT AND SUNDAY. CHANCE OF
WATERSPOUTS SUNDAY. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT
OVERNIGHT. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT SUBSIDING TO 3 TO
5 FT OCCASIONALLY TO 7 FT SUNDAY. WAVES 2 TO 4 FT SUNDAY EVENING.

MICHIGAN SOUTH 13640 12730 13720. CHANCE OF SHOWERS SUNDAY. CHANCE
OF WATERSPOUTS SUNDAY. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT
OVERNIGHT. WAVES SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
SUNDAY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUNDAY EVENING.

$$

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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