Great Lakes Forecast
Issued by NWS

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173
FZUS63 KLOT 181340
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
840 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 30.5 INCHES EXTENDING FROM NORTHERN
QUEBEC THROUGH THE OHIO VALLEY WILL STRETCH FROM THE CANADIAN
MARITIMES TO THE MID ATLANTIC REGION WENDESDAY. LOW PRESSURE OF
29.7 INCHES OVER THE DAKOTAS WILL TRACK EAST TO LAKE SUPERIOR BY
THIS EVENING. THE LOW WILL CONTINUE EAST INTO SOUTHERN ONTARIO
TONIGHT...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.

LMZ261-362-364-366-563-565-567-868-182130-
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-
840 AM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF 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 NORTHWEST 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-182130-
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-
840 AM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KT BECOMING SOUTH TO 30
KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...SOUTH WINDS 15 TO 25 KT BECOMING WEST 10 TO 20 KT LATE.
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.

$$
LMZ761-182130-
MAFOR 1815/
MICHIGAN NORTH 11330 14440 11540 11720 11820. CHANCE OF RAIN
SHOWERS TODAY. CHANCE OF SHOWERS TONIGHT. 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. WAVES 3 TO 5 FT OCCASIONALLY TO 7
FT WEDNESDAY MORNING.

MICHIGAN SOUTH 10330 11430 12440 12430 11530 11620 11720. CHANCE
OF SHOWERS LATE...THEN CHANCE OF SHOWERS AND THUNDERSTORMS LATE
THIS EVENING. CHANCE OF SHOWERS AND THUNDERSTORMS WEDNESDAY
MORNING. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT TODAY. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT TONIGHT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT WEDNESDAY MORNING.

$$


JEE

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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