Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 180749
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
249 AM CDT SAT MAR 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 29.9 INCHES OVER LAKE SUPERIOR WILL MOVE
SOUTHEAST REACHING THE CAROLINA COAST THIS EVENING. HIGH PRESSURE
OF 30.4 INCHES EXTENDS FROM HUDSON BAY SOUTH ACROSS THE NORTHERN
AND CENTRAL PLAINS. THIS HIGH WILL MOVE EAST INTO THE WESTERN
GREAT LAKES TONIGHT, THEN CONTINUE EAST TO THE EASTERN SEABOARD BY
MONDAY MORNING. MEANWHILE, LOW PRESSURE OF 29.2 INCHES WILL
DEVELOP OVER ALBERTA TODAY, THEN DEEPEN TO 28.9 INCHES AS IT MOVES
TO HUDSON BAY BY SUNDAY NIGHT. A COLD FRONT TRAILING SOUTH FROM
THIS LOW WILL MOVE ACROSS THE LAKE MONDAY MORNING. HIGH PRESSURE
OF 30.6 INCHES OVER THE CANADIAN PRAIRIES MONDAY WILL BUILD
SOUTHEAST WITH RIDGING EXTENDING INTO THE WESTERN GREAT LAKES
REGION BY MONDAY EVENING. THE CENTER OF THE HIGH WILL REACH THE
WESTERN GREAT LAKES BY MIDDAY WEDNESDAY.

LMZ261-362-364-563-181530-
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-
249 AM CDT SAT MAR 18 2017

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.TODAY...VARIABLE WINDS LESS THAN 10 KT BECOMING NORTH WINDS 10
TO 20. AREAS OF FOG THIS MORNING. CHANCE OF SNOW SHOWERS...MAINLY
THIS MORNING. WAVES 2 TO 4 FT.
.TONIGHT...NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST 10 TO 15
KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.
.SUNDAY...EAST WINDS 5 TO 10 KT BECOMING SOUTH LATE IN THE
MORNING...THEN BECOMING 10 TO 20 KT EARLY IN THE AFTERNOON
INCREASING TO 15 TO 25 KT LATE. WAVES 1 TO 2 FT BUILDING TO 2 TO
4 FT.
.SUNDAY NIGHT...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO
25 KT. CHANCE OF RAIN SHOWERS AND FREEZING RAIN IN THE EVENING...
THEN CHANCE OF RAIN SHOWERS AND FREEZING RAIN LIKELY OVERNIGHT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.MONDAY...WEST WINDS 10 TO 20 KT BECOMING NORTHWEST 10 TO 15 KT.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.MONDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. WAVES 1 TO 3 FT.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES
2 TO 4 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 1 TO 3 FT.

$$

LMZ366-565-567-669-671-868-870-872-181530-
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 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 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-
249 AM CDT SAT MAR 18 2017

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO NORTH POINT LIGHT WI
TO GRAND HAVEN MI...

.TODAY...NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT. PATCHY
FOG THIS MORNING. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING
TO 2 TO 4 FT.
.TONIGHT...NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST AND
DIMINISHING TO AROUND 10 KT LATE. WAVES 2 TO 4 FT.
.SUNDAY...VARIABLE WINDS LESS THAN 10 KT BECOMING SOUTH LATE IN
THE MORNING...THEN GRADUALLY INCREASING TO 15 TO 25 KT DURING THE
AFTERNOON. WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.
.SUNDAY NIGHT...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO
25 KT. SHOWERS LIKELY...ESPECIALLY LATE. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.MONDAY...WEST WINDS 10 TO 20 KT BECOMING NORTHWEST 10 TO 15 KT.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.MONDAY NIGHT...NORTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. WAVES 1 TO 3 FT.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KT BECOMING NORTH TO 30 KT.
WAVES 2 TO 4 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.

$$

LMZ080-673-675-777-779-874-876-878-181530-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-
249 AM CDT SAT MAR 18 2017

NORTH POINT LIGHT WI TO GRAND HAVEN MI SOUTH...

.TODAY...NORTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
CHANCE OF RAIN OR SNOW SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9
FT.
.TONIGHT...NORTHWEST WINDS 15 TO 25 KT BECOMING NORTH 10 TO
20 KT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO
4 FT.
.SUNDAY...NORTHEAST WINDS 5 TO 10 KT BECOMING EAST LATE IN THE
MORNING...THEN BECOMING SOUTH 10 TO 15 KT EARLY IN THE AFTERNOON
INCREASING TO 10 TO 20 KT LATE. WAVES 1 TO 3 FT.
.SUNDAY NIGHT...SOUTH WINDS 10 TO 20 KT. CHANCE OF RAIN SHOWERS
OVERNIGHT. WAVES 2 TO 4 FT.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KT VEERING TO NORTH. CHANCE OF
RAIN SHOWERS IN THE MORNING. WAVES 1 TO 3 FT SUBSIDING TO 1 TO
2 FT.
.MONDAY NIGHT...NORTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.

$$

LMZ761-181530-
MAFOR 1809/
MICHIGAN NORTH 11903 15820 11110. WAVES 2 TO 4 FT THROUGH THIS
EVENING SUBSIDING TO 1 TO 2 FT LATE TONIGHT.

MICHIGAN CENTRAL 12840 11830 13820 11120 11110. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT BY EVENING.

MICHIGAN SOUTH 14747 13730 11820. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT TODAY AND 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4
FT TONIGHT.

$$

IZZI

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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