Great Lakes Forecast
Issued by NWS

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474
FZUS63 KLOT 211402
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
902 AM CDT SUN AUG 21 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 29.2 INCHES NEAR JAMES BAY
WILL CONTINUE TO LIFT NORTHEAST AND REACH NORTHERN QUEBEC LATE
TONIGHT. HIGH PRESSURE OF 30.1 INCHES CENTERED OVER THE UPPER
MISSOURI VALLEY CONTINUES TO BUILD TO THE EAST AND WILL BECOME
CENTERED OVER THE OHIO VALLEY BY MONDAY MORNING. THE HIGH WILL
CONTINUE TO DRIFT EAST TO THE ATLANTIC SEABOARD BY LATE TUESDAY.
LOW PRESSURE OF 29.7 INCHES WILL CROSS NORTHERN LAKE MICHIGAN
LATER IN THE WEEK.

LMZ261-362-364-563-212130-
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-
902 AM CDT SUN AUG 21 2016

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.REST OF TODAY...NORTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO
20 KT BY LATE AFTERNOON. SLIGHT CHANCE OF WATERSPOUTS. SCATTERED
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS THIS MORNING...THEN
SLIGHT CHANCE OF THUNDERSTORMS WITH ISOLATED SHOWERS THIS
AFTERNOON. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 3 TO
5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 10 TO 15 KT.
SLIGHT CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FT.
.MONDAY...WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST 15 TO 25 KT.
WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS TO 30 KT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT.
.TUESDAY...SOUTHWEST WINDS TO 30 KT. WAVES BUILDING TO 5 TO 8 FT
OCCASIONALLY TO 10 FT.
.TUESDAY NIGHT...SOUTHWEST WINDS TO 30 KT DIMINISHING TO 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. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...WEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.

$$

LMZ366-565-567-868-212130-
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-
902 AM CDT SUN AUG 21 2016

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

.REST OF TODAY...NORTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO 20
KT. SLIGHT CHANCE OF WATERSPOUTS. SCATTERED SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 10 TO 15 KT.
SLIGHT CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FT.
.MONDAY...WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST 15 TO 25 KT.
WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY NIGHT...SOUTHWEST WINDS TO 30 KT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT.
.TUESDAY...SOUTHWEST WINDS TO 30 KT. WAVES BUILDING TO 5 TO 8 FT
OCCASIONALLY TO 10 FT.
.TUESDAY NIGHT...SOUTHWEST WINDS TO 30 KT DIMINISHING TO 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. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...WEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-212130-
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-
902 AM CDT SUN AUG 21 2016

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...NORTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO 20
KT. SLIGHT CHANCE OF WATERSPOUTS. SCATTERED SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT
SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. SLIGHT CHANCE OF SHOWERS IN THE EVENING. WAVES SUBSIDING TO
3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY...WEST WINDS 10 TO 15 KT BACKING TO SOUTH 10 TO 20 KT.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TUESDAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT.
.TUESDAY NIGHT...SOUTH WINDS 15 TO 25 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 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 20 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 2 TO 4 FT.

$$
LMZ761-212130-
MAFOR 2115/
MICHIGAN NORTH 11740 11730 12720 12710 11610 11620. SLIGHT CHANCE
OF WATERSPOUTS. SCATTERED SHOWERS AND A SLIGHT CHANCE FOR
THUNDERSTORMS TODAY. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT TODAY. WAVES 2 TO 4 FT
TONIGHT. WAVES 1 TO 3 FT MONDAY MORNING.

MICHIGAN SOUTH 11740 11730 13720 12710 11610. SCATTERED SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS TODAY. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT
TODAY. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT
TONIGHT. WAVES 2 TO 4 FT MONDAY MORNING.

$$

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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