Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 200759
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
259 AM CDT SAT SEP 20 2014

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 AVERAGING 29.5 INCHES OVER
SOUTHERN ONTARIO...WILL SHIFT NORTHEAST ACROSS WESTERN QUEBEC BY
SUNDAY MORNING. A SECOND AREA OF LOW PRESSURE AROUND 29.6 INCHES
SHOULD DEVELOP ACROSS WISCONSIN LATE SATURDAY NIGHT...THEN SHIFT
EASTWARD ACROSS LOWER MICHIGAN DURING THE DAY SUNDAY. THIS SYSTEM
WILL DRIVE A COLD FRONT SOUTHWARD OVER THE LAKE DURING THE MORNING
ON SUNDAY. MEANWHILE...HIGH PRESSURE OF 30.2 INCHES WILL SPREAD
ACROSS THE CENTRAL PLAINS AND WESTERN GREAT LAKES REGION SUNDAY
AND THEN THE OHIO VALLEY ON MONDAY. THE HIGH WILL SLOWLY SPREAD
EASTWARD THROUGH MID WEEK.

LMZ261-362-364-366-563-565-201545-
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-
259 AM CDT SAT SEP 20 2014

TWO RIVERS WI TO MANISTEE MI NORTH

...GALE WARNING IN EFFECT UNTIL 10 AM CDT THIS MORNING...

.TODAY...SOUTHWEST GALES TO 35 KT EASING TO 30 KT THIS
MORNING...THEN BECOMING WEST 10 TO 20 KT LATE THIS AFTERNOON.
SHOWERS AND THUNDERSTORMS LIKELY THIS MORNING...MAINLY THIS
MORNING. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO
8 FT OCCASIONALLY TO 10 FT LATE.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. CHANCE OF
SHOWERS AND THUNDERSTORMS THROUGH EARLY EVENING...THEN CHANCE OF
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE EVENING.
CHANCE OF SHOWERS OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
SUBSIDING TO 2 TO 4 FT FROM LATE EVENING ON.
.SUNDAY...NORTH WINDS TO 30 KT. CHANCE OF SHOWERS IN THE
MORNING...THEN SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO 6 TO 9 FT OCCASIONALLY
TO 11 FT FROM LATE MORNING ON.
.SUNDAY NIGHT...NORTH WINDS TO 30 KT EASING TO 10 TO 20 KT
OVERNIGHT. WAVES SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
OVERNIGHT.
.MONDAY...NORTHWEST WINDS 10 TO 15 KT BECOMING SOUTHWEST. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT IN THE
AFTERNOON.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT BECOMING WEST. WAVES
2 TO 4 FT.
.TUESDAY...NORTH WINDS 10 TO 15 KT VEERING TO EAST 5 TO 10 KT.
WAVES 1 TO 3 FT.
.WEDNESDAY...SOUTH WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.

$$

LMZ080-671-673-675-777-779-872-874-876-878-201545-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-
259 AM CDT SAT SEP 20 2014

PORT WASHINGTON WI TO WHITEHALL MI SOUTH

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.TODAY...SOUTHWEST WINDS TO 30 KT EASING TO 15 TO 20 KT LATE.
CHANCE OF SHOWERS AND THUNDERSTORMS THIS MORNING...THEN SHOWERS
AND THUNDERSTORMS LIKELY EARLY THIS AFTERNOON. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
LATE.
.TONIGHT...WEST WINDS 10 TO 15 KT INCREASING TO 15 TO 25 KT LATE.
CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH EARLY EVENING...THEN
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS LATE IN THE EVENING.
SLIGHT CHANCE OF SHOWERS OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY
TO 8 FT SUBSIDING TO 2 TO 4 FT OVERNIGHT.
.SUNDAY...NORTHWEST WINDS TO 30 KT BECOMING NORTH GALES TO
35 KT BY LATE MORNING...THEN DIMINISHING TO 30 KT BY EVENING.
CHANCE OF SHOWERS IN THE MORNING...THEN SLIGHT CHANCE OF SHOWERS
IN THE AFTERNOON. WAVES BUILDING TO 7 TO 10 FT OCCASIONALLY TO 13
FT.
.SUNDAY NIGHT...NORTH WINDS TO 30 KT EASING TO 10 TO 20 KT OVERNIGHT.
WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT OVERNIGHT.
.MONDAY...NORTH WINDS 10 TO 20 KT BECOMING NORTHWEST 10 TO 15 KT.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT IN THE AFTERNOON.
.MONDAY NIGHT...WEST WINDS 10 TO 15 KT. WAVES 2 TO 4 FT.
.TUESDAY...WEST WINDS 10 TO 15 KT BECOMING NORTHWEST 5 TO 10 KT.
WAVES 1 TO 3 FT.
.WEDNESDAY...SOUTHEAST WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.

$$

LMZ567-669-868-870-201545-
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 PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
259 AM CDT SAT SEP 20 2014

TWO RIVERS WI TO MANISTEE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI

...GALE WARNING IN EFFECT UNTIL 10 AM CDT THIS MORNING...
...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.TODAY...SOUTHWEST GALES TO 35 KT EASING TO 30 KT THIS
MORNING...THEN BECOMING WEST 10 TO 20 KT LATE THIS AFTERNOON.
CHANCE OF SHOWERS AND THUNDERSTORMS THIS MORNING...THEN SHOWERS
AND THUNDERSTORMS LIKELY EARLY THIS AFTERNOON. WAVES 8 TO 11 FT
OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT
LATE.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KT. SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS THROUGH EARLY EVENING...THEN CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS. WAVES 4 TO 6 FT OCCASIONALLY
TO 8 FT SUBSIDING TO 2 TO 4 FT FROM LATE EVENING ON.
.SUNDAY...NORTHWEST WINDS 15 TO 25 KT BECOMING NORTH TO 30 KT
LATE IN THE MORNING. OCCASIONAL GALES TO 35 KT POSSIBLE LATE IN
THE MORNING AND IN THE AFTERNOON. CHANCE OF SHOWERS IN THE
MORNING...THEN SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 6
TO 9 FT OCCASIONALLY TO 11 FT BUILDING TO 7 TO 10 FT OCCASIONALLY
TO 13 FT LATE.
.SUNDAY NIGHT...NORTH WINDS TO 30 KT EASING TO 15 TO 20 KT OVERNIGHT.
WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT.
.MONDAY...NORTHWEST WINDS 10 TO 15 KT BECOMING WEST. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO
7 FT IN THE AFTERNOON.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 15 KT BECOMING WEST. WAVES
1 TO 3 FT.
.TUESDAY...NORTHWEST WINDS 10 TO 15 KT VEERING TO NORTHEAST 5 TO
10 KT. WAVES 1 TO 3 FT.
.WEDNESDAY...SOUTH WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.

$$

LMZ761-201545-
MAFOR 2009/
MICHIGAN NORTH...GALE WARNING IN EFFECT...
11559 11540 19559 11549 11630 11620 11720 12820. SHOWERS AND
THUNDERSTORMS LIKELY EARLY THIS MORNING THEN CHANCE OF SHOWERS AND
THUNDERSTORMS THIS AFTERNOON. CHANCE OF SHOWERS TONIGHT. WAVES 8
TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO 8 FT OCCASIONALLY
TO 10 FT TODAY...THEN SUBSIDING TO 2 TO 4 FT TONIGHT.

MICHIGAN SOUTH...12540 12539 11520 12610 11620. CHANCE OF SHOWERS
AND THUNDERSTORMS TODAY. CHANCE OF SHOWERS TONIGHT. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
TODAY...THEN SUBSIDING TO 2 TO 4 FT TONIGHT.

$$

KJB






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