Great Lakes Forecast
Issued by NWS

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421
FZUS63 KLOT 212030
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
ISSUED BY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
330 PM CDT TUE MAR 21 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 PERCENT OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...STRONG HIGH PRESSURE OF 30.8 INCHES WILL BUILD
SOUTHEAST FROM SOUTHERN MANITOBA CANADA INTO THE WESTERN GREAT
LAKES REGION ON WEDNESDAY. THE HIGH WILL THEN MOVE SOUTHEAST TO
THE MID ATLANTIC COAST BY THURSDAY AFTERNOON. LOW PRESSURE OF 29.4
INCHES WILL THEN DEVELOP OVER THE CENTRAL HIGH PLAINS THURSDAY
INTO FRIDAY. THE LOW WILL WEAKEN A BIT TO 29.7 INCHES AS IT MOVES
SLOWLY NORTHEAST TOWARD AND INTO NORTHERN ILLINOIS OVER THE
WEEKEND.

LMZ261-362-364-366-563-565-567-868-220315-
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-
330 PM CDT TUE MAR 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

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

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220315-
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-
330 PM CDT TUE MAR 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...NORTH WINDS TO 30 KT BECOMING NORTHEAST 15 TO 25 KT.
SLIGHT CHANCE OF SNOW SHOWERS THIS EVENING. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT.
.WEDNESDAY...NORTHEAST WINDS 10 TO 20 KT DIMINISHING TO 5 TO
10 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO
4 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS 10 TO 15 KT VEERING TO
SOUTHEAST 10 TO 20 KT. WAVES 2 TO 4 FT.
.THURSDAY...SOUTHEAST WINDS 15 TO 25 KT BECOMING SOUTH. WAVES
4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY NIGHT...SOUTH WINDS 15 TO 25 KT. RAIN SHOWERS IN THE
EVENING...THEN RAIN SHOWERS LIKELY OVERNIGHT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.FRIDAY...SOUTH WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS. WAVES
2 TO 4 FT.
.FRIDAY NIGHT...SOUTH WINDS 10 TO 20 KT BACKING TO EAST. RAIN
SHOWERS LIKELY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY...EAST WINDS TO 30 KT. RAIN SHOWERS LIKELY. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT.
.SUNDAY...EAST WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT IN THE
AFTERNOON. CHANCE OF RAIN. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.

$$

LMZ761-220315-
MAFOR 2121/
MICHIGAN NORTH 13840 12830 11820 11810 11800. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11 FT
TONIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4
FT WEDNESDAY.

MICHIGAN SOUTH 11830 13840 11130 12120 11110. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 11 FT
TONIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO 4
FT WEDNESDAY.

$$
WOOD

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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