Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 221954
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
254 PM CDT SAT AUG 22 2015

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...EXPANSIVE HIGH PRESSURE OF 30.1 INCHES FROM THE EASTERN
OHIO VALLEY TO SOUTHERN QUEBEC WILL CONTINUE TO SLOWLY MOVE EAST
TONIGHT. LOW PRESSURE OF 29.4 INCHES OVER THE NORTHERN PLAINS WILL
MOVE TO WESTERN ONTARIO THIS EVENING AS IT DEEPENS TO 29.2 INCHES.
THIS LOW WILL THEN GRADUALLY WEAKEN TO 29.6 INCHES AS IT SLOWLY
MOVES ACROSS CENTRAL ONTARIO THROUGH MONDAY NIGHT. A TRAILING COLD
FRONT FROM THE LOW WILL MOVE ACROSS THE LAKE DURING THE DAY ON
SUNDAY. HIGH PRESSURE OF 30.1 INCHES WILL BUILD ACROSS THE PLAINS
SUNDAY AND ACROSS THE MIDDLE MISSISSIPPI AND UPPER OHIO VALLEYS
MONDAY AND TUESDAY.

LMZ261-362-364-366-563-565-567-868-230330-
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 PM CDT SAT AUG 22 2015

SHEBOYGAN WI TO PENTWATER MI NORTH

.TONIGHT...SOUTH WINDS 15 TO 25 KT WITH A FEW GUSTS TO 30 KT EARLY
INCREASING TO 30 KT. CHANCE OF SHOWERS OVERNIGHT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST. OCCASIONAL GALE
FORCE GUSTS TO 35 KT IN THE MORNING. SHOWERS WITH A CHANCE OF
THUNDERSTORMS IN THE MORNING...THEN CHANCE OF SHOWERS IN THE
AFTERNOON. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.SUNDAY NIGHT...WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.
.MONDAY...WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT.
.MONDAY NIGHT...WEST WINDS 15 TO 25 KT BECOMING NORTHWEST.
SHOWERS LIKELY IN THE EVENING...THEN CHANCE OF SHOWERS OVERNIGHT.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO
20 KT. CHANCE OF SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TUESDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 1 TO 3 FT.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. WAVES 1 TO 3 FT.
.THURSDAY...NORTHWEST WINDS 5 TO 10 KT BECOMING SOUTHWEST. WAVES
1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-230330-
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 PM CDT SAT AUG 22 2015

SHEBOYGAN WI TO PENTWATER MI SOUTH

.TONIGHT...SOUTHEAST WINDS 10 TO 20 KT WITH OCCASIONAL GUSTS TO 25
KT EARLY BECOMING SOUTH AND INCREASING TO 30 KT LATE. CHANCE OF
SHOWERS OVERNIGHT. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.SUNDAY...SOUTH WINDS TO 30 KT VEERING TO WEST 20 TO 25 KT.
SHOWERS LIKELY WITH SLIGHT CHANCE OF THUNDERSTORMS IN THE
MORNING...THEN SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 4
TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY NIGHT...WEST WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT.
.MONDAY...WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT.
.MONDAY NIGHT...NORTHWEST WINDS 20 TO 25 KT. CHANCE OF SHOWERS.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO
20 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.TUESDAY NIGHT...NORTHWEST WINDS 10 TO 15 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 1 TO 2 FT.
.WEDNESDAY...NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH. WAVES
1 TO 2 FT.
.THURSDAY...NORTH WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.

$$

LMZ761-230330-
MAFOR 2221/
MICHIGAN NORTH 14430 11440 12446 19456 11546. CHANCE OF SHOWERS
OVERNIGHT ON SUNDAY AND CHANCE OF THUNDERSTORMS SUNDAY MORNING.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT BUILDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT TONIGHT AND TO 6 TO 9 FT OCCASIONALLY TO 11
FT SUNDAY.

MICHIGAN SOUTH 11320 19330 11320 11420 11430 11440 11446 11546
11630. CHANCE OF SHOWERS OVERNIGHT AND CHANCE OF THUNDERSTORMS
THROUGH MID DAY SUNDAY. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT TONIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUNDAY.

$$

RC



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