Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 182002
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
302 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 JUST NORTH OF LAKE HURON
WILL MOVE OFF TO THE EAST WITH A TRAILING COLD FRONT PUSHING SOUTH
OF THE LAKE THIS EVENING. 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.

LMZ261-362-364-366-563-565-190330-
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-
302 PM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

...GALE WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING...

.TONIGHT...NORTH GALES TO 35 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.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-190330-
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-
302 PM CDT THU MAY 18 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TONIGHT...NORTH WINDS TO 30 KT BECOMING NORTHEAST 15 TO 25 KT.
WAVES 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.


$$

LMZ761-190330-
MAFOR 1821/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11750 11850 11140 14130
11130. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT TONIGHT. WAVES 4 TO 6
FT OCCASIONALLY TO 8 FT FRIDAY.

MICHIGAN SOUTH 11740 12840 11830 14130. CHANCE OF SHOWERS FRIDAY.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT TONIGHT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT FRIDAY.

$$

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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