Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 180755
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
255 AM CDT TUE APR 18 2017

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 OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...HIGH PRESSURE OF 30.6 INCHES EXTENDING FROM NORTHERN
QUEBEC THROUGH THE OHIO VALLEY WILL SHIFT TO A POSITION FROM THE
CANADIAN MARITIMES TO THE MID ATLANTIC REGION ON WENDESDAY. LOW
PRESSURE OF 29.6 INCHES OVER THE DAKOTAS WILL TRACK EAST TO LAKE
SUPERIOR BY TUESDAY EVENING. THE LOW WILL CONTINUE EAST INTO
SOUTHERN ONTARIO TUESDAY NIGHT...DRAGGING ANOTHER COLD FRONT
ACROSS THE LAKE. THE COLD FRONT SHOULD PUSH SOUTH OF THE LAKE BY
WEDNESDAY MORNING WHILE HIGH PRESSURE OF 30.4 INCHES BUILDS ACROSS
CENTRAL CANADA AND NEW LOW PRESSURE OF 29.6 INCHES WILL DEVELOP
OVER THE CENTRAL PLAINS. THIS LOW WILL PASS OVER SOUTHERN LAKE
MICHIGAN THURSDAY MORNING WHILE HIGH PRESSURE OF 30.3 INCHES
SPREADS ACROSS THE NORTHERN AND CENTRAL PLAINS.

LMZ261-362-364-366-563-565-567-868-181515-
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-
255 AM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...SOUTHEAST WINDS 15 TO 25 KT BECOMING SOUTH TO 30 KT.
CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS THIS
AFTERNOON. WAVES 2 TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO
9 FT.
.TONIGHT...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST AFTER
MIDNIGHT...THEN BECOMING WEST 10 TO 20 KT LATE. CHANCE OF RAIN
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING...THEN
SLIGHT CHANCE OF RAIN SHOWERS OVERNIGHT. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT BECOMING EAST TO
30 KT. RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN SHOWERS
OVERNIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO 4 TO
7 FT OCCASIONALLY TO 9 FT.
.THURSDAY...NORTHEAST WINDS TO 30 KT BECOMING NORTH. RAIN SHOWERS
LIKELY. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.THURSDAY NIGHT...NORTH WINDS TO 30 KT. CHANCE OF RAIN SHOWERS.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...NORTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...NORTHEAST WINDS 10 TO 15 KT INCREASING TO 10 TO
20 KT. WAVES 1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-181515-
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-
255 AM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...SOUTHEAST WINDS 15 TO 25 KT BECOMING SOUTH TO 30 KT.
WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST 10 TO
20 KT. CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS
IN THE EVENING...THEN CHANCE OF RAIN SHOWERS AND THUNDERSTORMS
OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT VEERING TO
SOUTHEAST 10 TO 20 KT. RAIN SHOWERS AND THUNDERSTORMS LIKELY IN
THE EVENING...THEN RAIN SHOWERS AND THUNDERSTORMS OVERNIGHT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING NORTHWEST 15 TO
25 KT. CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.THURSDAY NIGHT...NORTHWEST WINDS 15 TO 25 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.FRIDAY...NORTH WINDS 15 TO 25 KT. WAVES 4 TO 6 FT OCCASIONALLY
TO 8 FT.
.SATURDAY...NORTHEAST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.

$$

LMZ761-181515-
MAFOR 1809/
MICHIGAN NORTH 11320 12330 11430 13440 11540. CHANCE OF SHOWERS.
WAVES 2 TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT TODAY.
WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT TONIGHT.

MICHIGAN SOUTH 11320 12330 11430 11440 12430 11530. CHANCE OF
SHOWERS AND THUNDERSTORMS TONIGHT. WAVES 2 TO 4 FT BUILDING TO 4
TO 6 FT OCCASIONALLY TO 8 FT TODAY. WAVES 4 TO 7 FT OCCASIONALLY
TO 9 FT TONIGHT.

$$

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/LOT/GLFTABLE

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES



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