Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 212349 AAA
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN...UPDATED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
649 PM CDT THU JUL 21 2016

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 HEIGHT OF THE HIGHEST 1/3 OF THE WAVES...ALONG
WITH THE AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES
WHICH WILL OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...LOW PRESSURE OF 29.4 INCHES OVER WESTERN QUEBEC WILL
MOVE EAST TONIGHT WITH A TRAILING WEAK COLD FRONT SINKING
SOUTHWARD OVER NORTHERN LAKE MICHIGAN. THIS FRONT WILL MOVE SOUTH
OVER THE REMAINDER OF THE LAKE DURING THE DAY FRIDAY. A WEAK HIGH
PRESSURE RIDGE AVERAGING 29.9 INCHES WILL MOVE OVER THE LAKE
FRIDAY NIGHT. ANOTHER LOW OF 29.5 INCHES OVER THE NORTHERN PLAINS
AND CANADIAN PRAIRIES SATURDAY WILL LIFT ACROSS THE UPPER
MISSISSIPPI VALLEY TO THE WESTERN GREAT LAKES SUNDAY AND SUNDAY
NIGHT WHILE ANOTHER COLD FRONT PUSHES ACROSS LAKE MICHIGAN. HIGH
PRESSURE OF 30.1 INCHES WILL BUILD OVER THE WESTERN GREAT LAKES
TUESDAY AND EASTERN LAKES WEDNESDAY.


LMZ261-362-364-366-563-565-567-868-220330-
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-
649 PM CDT THU JUL 21 2016

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT
LATE THIS EVENING...THEN BECOMING WEST AFTER MIDNIGHT AND DIMINISHING
TO 10 TO 15 KT LATE. CHANCE OF SHOWERS AND THUNDERSTORMS THIS
EVENING. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO 4
FT.
.FRIDAY...WEST WINDS SUBSIDING TO 5 TO 10 KT. WAVES 1 TO 3 FT.
.FRIDAY NIGHT...WEST WINDS 5 TO 10 KT VEERING TO NORTH. WAVES
1 TO 2 FT.
.SATURDAY...NORTH WINDS LESS THAN 10 KT BECOMING NORTHEAST. WAVES
1 FT OR LESS.
.SATURDAY NIGHT...EAST WINDS 5 TO 10 KT BECOMING SOUTHEAST.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 2 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT. SHOWERS LIKELY WITH A CHANCE
OF THUNDERSTORMS. WAVES 1 TO 3 FT.
.SUNDAY NIGHT...WEST WINDS 10 TO 15 KT. CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES 1 TO 3 FT.
.MONDAY...WEST WINDS 10 TO 15 KT BECOMING NORTHWEST. WAVES 1 TO
2 FT.
.TUESDAY...NORTH WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.

$$

LMZ080-669-671-673-675-870-872-874-876-878-220330-
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 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-
649 PM CDT THU JUL 21 2016

SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...

.TONIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST LATE THIS
EVENING...AND THEN DIMINISHING TO 10 TO 15 KT LATE. CHANCE OF
SHOWERS AND THUNDERSTORMS...SOME OF WHICH MAY BE GUSTY. WAVES 3
TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT. HIGHER WINDS
AND WAVES NEAR STORMS.
.FRIDAY...WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE MORNING...THEN SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO
2 FT.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 10 KT BECOMING NORTH LATE IN
THE EVENING...THEN BECOMING NORTHWEST AFTER MIDNIGHT BECOMING
NORTH LATE. WAVES 1 FT OR LESS.
.SATURDAY...NORTHEAST WINDS LESS THAN 10 KT BECOMING NORTH. WAVES
1 FT OR LESS.
.SATURDAY NIGHT...EAST WINDS 5 TO 10 KT VEERING TO SOUTHEAST.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 2 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST. CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...WEST WINDS 10 TO 20 KT BECOMING NORTHWEST. CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FT.
.MONDAY...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.

$$

LMZ777-779-220330-
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-
649 PM CDT THU JUL 21 2016

WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...

...SEVERE THUNDERSTORM WATCH 407 IN EFFECT UNTIL MIDNIGHT CDT
TONIGHT...

.TONIGHT...SOUTH WINDS 10 TO 20 KT BECOMING NORTHWEST BY MID
EVENING AND THEN BECOMING SOUTHWEST 10 TO 15 KT AFTER MIDNIGHT.
SHOWERS AND THUNDERSTORMS...MAINLY THIS EVENING...SOME OF WHICH
WILL BE GUSTY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO 2
TO 4 FT. WINDS AND WAVES HIGHER NEAR STORMS.
.FRIDAY...WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 2 FT.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 10 KT BECOMING NORTH LATE IN
THE EVENING...THEN BECOMING NORTHWEST AFTER MIDNIGHT BECOMING
NORTH LATE. WAVES 1 FT OR LESS.
.SATURDAY...NORTHEAST WINDS LESS THAN 10 KT BECOMING NORTH. WAVES
1 FT OR LESS.
.SATURDAY NIGHT...EAST WINDS 5 TO 10 KT VEERING TO SOUTHEAST.
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 2 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST. CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FT.
.SUNDAY NIGHT...WEST WINDS 10 TO 20 KT BECOMING NORTHWEST. CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FT.
.MONDAY...NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.

$$
LMZ761-220330-
MAFOR 2200 AMD/
MICHIGAN NORTH 11530 11520 11620 11610 13600. CHANCE OF SHOWERS
AND THUNDERSTORMS THIS EVENING. WAVES 4 TO 7 FT OCCASIONALLY TO 9
FT SUBSIDING TO 2 TO 4 FT TONIGHT...FURTHER SUBSIDING TO 1 TO 3
FT FRIDAY.

MICHIGAN SOUTH...SEVERE THUNDERSTORM WATCH IN EFFECT...11429 11729
19739 12510 11610 12600. CHANCE OF SHOWERS AND THUNDERSTORMS
OVERNIGHT AND FRIDAY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT
SUBSIDING TO 2 TO 4 FT OVERNIGHT...THEN TO 1 TO 2 FT FRIDAY
MORNING.

$$

MTF


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