Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 190140
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
840 PM CDT THU MAY 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...LOW PRESSURE OF 29.5 INCHES IS OVER SOUTHEAST CANADA
AND ITS COLD FRONT HAS PUSHED SOUTH OF LAKE MICHIGAN. HIGH
PRESSURE OF 30.4 INCHES WILL BUILD ACROSS THE UPPER GREAT LAKES
REGION AS THE FRONT PUSHES INTO THE OHIO VALLEY BY FRIDAY MORNING.
THE HIGH WILL CONTINUE TO SPREAD EAST TO SOUTHERN QUEBEC AND THE
EASTERN LAKES BY SATURDAY MORNING. LOW PRESSURE OF 29.7 INCHES
FROM IOWA ON SATURDAY TO LAKE SUPERIOR ON SUNDAY. THE LOW OF 29.5
INCHES WILL DEVELOP OVER THE SOUTH HIGH PLAINS FRIDAY AFTERNOON
AND TRACK NORTHEAST TO THE UPPER MISSOURI VALLEY SATURDAY
AFTERNOON WHILE THE HIGH CONTINUES TO SLIDE EAST INTO QUEBEC. THE
LOW IS EXPECTED TO THEN LIFT NORTH INTO SOUTHERN ONTARIO ON SUNDAY
AS ANOTHER COLD FRONT PUSHES ACROSS THE LAKE.

LMZ261-362-364-366-563-565-190930-
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-
840 PM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.REST OF TONIGHT...NORTH WINDS TO 30 KT BECOMING NORTHEAST 15 TO
25 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.FRIDAY NIGHT...NORTHEAST WINDS TO 30 KT BECOMING EAST 15 TO
25 KT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO
4 FT.
.SATURDAY...EAST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS IN THE
MORNING...THEN RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
IN THE AFTERNOON. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY NIGHT...EAST WINDS TO 30 KT BECOMING SOUTHEAST 15 TO
25 KT. RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS IN THE
EVENING...THEN CHANCE OF RAIN SHOWERS OVERNIGHT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST. CHANCE OF
RAIN SHOWERS IN THE MORNING. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KT. WAVES 2 TO 4 FT.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.TUESDAY...NORTH WINDS 10 TO 20 KT. CHANCE OF RAIN SHOWERS. WAVES
1 TO 3 FT.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-190930-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
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 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 PENTWATER TO MANISTEE MI 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 PM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.REST OF TONIGHT...NORTH WINDS TO 30 KT BECOMING NORTHEAST 15 TO
25 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT BUILDING TO 5 TO 8 FT
OCCASIONALLY TO 10 FT.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY NIGHT...NORTHEAST WINDS TO 30 KT BECOMING EAST. CHANCE OF
SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...EAST WINDS TO 30 KT BECOMING SOUTHEAST. CHANCE OF
RAIN SHOWERS IN THE MORNING...THEN RAIN SHOWERS LIKELY WITH A
CHANCE OF THUNDERSTORMS IN THE AFTERNOON. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY NIGHT...SOUTHEAST WINDS TO 30 KT BECOMING SOUTH 10 TO
20 KT OVERNIGHT. SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS IN
THE EVENING...THEN CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT.
WAVES 2 TO 4 FT.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF RAIN SHOWERS IN
THE MORNING. WAVES 1 TO 3 FT.
.SUNDAY NIGHT...WEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 1 TO 3 FT.
.MONDAY...SOUTHWEST WINDS 15 TO 25 KT. WAVES 1 TO 3 FT.
.TUESDAY...SOUTH WINDS 10 TO 20 KT BACKING TO NORTHEAST 15 TO
25 KT. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FT.


$$
LMZ761-190930-
MAFOR 1903/
MICHIGAN NORTH 11840 11830 14130 11130 11140. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8
FT FRIDAY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT FRIDAY EVENING.

MICHIGAN SOUTH 11840 11830 14130 11130 11140. CHANCE OF SHOWERS
FRIDAY AND FRIDAY EVENING. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT OVERNIGHT. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT FRIDAY. WAVES 4 TO 6 FT OCCASIONALLY TO
8 FT FRIDAY EVENING.


$$


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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