Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 221348
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
848 AM 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 CENTERED OVER
THE EASTERN LAKES WILL SLOWLY MOVE EAST TODAY. LOW PRESSURE OF
29.5 INCHES OVER THE DAKOTAS WILL MOVE TO WESTERN ONTARIO
THIS EVENING AS IT DEEPENS TO 29.2 INCHES. THIS LOW WILL THEN
BEGIN TO WEAKEN AS IT SLOWLY MOVES ACROSS CENTRAL ONTARIO SUNDAY
AND SUNDAY NIGHT. A TRAILING COLD FRONT WILL MOVE ACROSS THE LAKE
SUNDAY. HIGH PRESSURE OF 30.1 INCHES WILL BUILD ACROSS THE PLAINS
SUNDAY AND ACROSS THE MIDDLE MISSISSIPPI AND UPPER OHIO VALLEYS
MONDAY.

LMZ261-362-364-366-563-565-567-868-222130-
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-
848 AM CDT SAT AUG 22 2015

SHEBOYGAN WI TO PENTWATER MI NORTH

.REST OF TODAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH 15 TO
25 KT. A FEW GUSTS TO 30 KT THIS AFTERNOON. WAVES 2 TO 4 FT
BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...SOUTH WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES 4
TO 6 FT OCCASIONALLY TO 8 FT BUILDING TO 5 TO 8 FT OCCASIONALLY
TO 10 FT.
.SUNDAY...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST EARLY IN THE
AFTERNOON...THEN WEST LATE. GALE FORCE GUSTS TO 35 KT POSSIBLE IN
THE MORNING. SHOWERS IN THE MORNING...THEN CHANCE OF SHOWERS IN
THE AFTERNOON. SLIGHT CHANCE OF THUNDERSTORMS. WAVES 7 TO 10 FT
OCCASIONALLY TO 13 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY NIGHT...WEST WINDS TO 30 KT. CHANCE OF SHOWERS OVERNIGHT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.MONDAY...WEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT. CHANCE
OF SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.MONDAY NIGHT...NORTHWEST WINDS 15 TO 25 KT. CHANCE OF SHOWERS.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TUESDAY...NORTHWEST WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES
2 TO 4 FT.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. WAVES 1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-222130-
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-
848 AM CDT SAT AUG 22 2015

SHEBOYGAN WI TO PENTWATER MI SOUTH

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

$$
LMZ761-222130-
MAFOR 2215/
MICHIGAN NORTH 11520 14430 11430 11440 11446 19456. WAVES 2 TO 4
FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT THIS AFTERNOON...TO
5 TO 8 FT OCCASIONALLY TO 10 FT TONIGHT AND TO 7 TO 10 FT
OCCASIONALLY TO 13 FT SUNDAY MORNING.

MICHIGAN SOUTH 11420 11420 19430 11320 19330 11320 11420 11430
11440 11446. WAVES 2 TO 4 FT THIS AFTERNOON AND EVENING BUILDING
TO 4 TO 7 FT TO OCCASIONALLY 9 FT TONIGHT AND TO 5 TO 8 FT
OCCASIONALLY TO 10 FT SUNDAY MORNING.

$$

RC



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