Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 281337
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
837 AM CDT FRI APR 28 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 29.3 INCHES OVER JAMES BAY WILL
HOLD STATIONARY TODAY WHILE WEAK HIGH PRESSURE OF 29.9 INCHES
ACROSS SOUTHERN LAKE MICHIGAN INCHES NORTHWARD. LARGER HIGH
PRESSURE WILL THEN DEVELOP AND MOVE ACROSS ONTARIO SATURDAY WHILE
LOW PRESSURE OF 29.5 INCHES DEVELOPS OVER THE SOUTHERN PLAINS.
THIS LOW WILL DEEPEN TO 29.3 INCHES AS IT LIFTS INTO IOWA SUNDAY
NIGHT...AND TO 29.2 INCHES AS IT MOVES TO THE WESTERN GREAT LAKES
ON MONDAY. A TRAILING COLD FRONT WILL MOVE ACROSS THE LAKE MONDAY
NIGHT WHILE THE LOW MOVES TO QUEBEC TUESDAY.

LMZ261-362-364-366-563-565-567-868-282130-
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-
837 AM CDT FRI APR 28 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO
20 KT BY MID AFTERNOON. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...SOUTHWEST WINDS 10 TO 15 KT VEERING TO NORTHWEST 10 TO
20 KT LATE IN THE EVENING...THEN BECOMING NORTH 15 TO 25 KT
OVERNIGHT. SLIGHT CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FT
BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT OVERNIGHT.
.SATURDAY...NORTH WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING TO 4 TO 7 FT OCCASIONALLY
TO 9 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT. CHANCE OF RAIN
SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY...EAST WINDS TO 30 KT BECOMING NORTHEAST GALES TO 35 KT.
RAIN SHOWERS IN THE MORNING...THEN RAIN SHOWERS LIKELY IN THE
AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 6 TO
9 FT OCCASIONALLY TO 11 FT.
.SUNDAY NIGHT...NORTHEAST GALES TO 35 KT BECOMING EAST GALES TO
40 KT. RAIN SHOWERS. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.MONDAY...SOUTHEAST GALES TO 35 KT BECOMING SOUTH TO 30 KT.
CHANCE OF RAIN SHOWERS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT
SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TUESDAY...WEST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-282130-
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-
837 AM CDT FRI APR 28 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...WEST WINDS 10 TO 15 KT BACKING TO NORTHEAST BY
MID AFTERNOON. CHANCE OF RAIN SHOWERS THIS AFTERNOON. WAVES 2 TO
4 FT SUBSIDING TO 1 TO 3 FT.
.TONIGHT...NORTHEAST WINDS 10 TO 15 KT GRADUALLY INCREASING TO 30
KT BY THE PREDAWN HOURS. CHANCE OF RAIN SHOWERS...MAINLY IN THE
EVENING. WAVES BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT. CHANCE OF RAIN SHOWERS.
WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.SATURDAY NIGHT...NORTHEAST WINDS TO 30 KT. OCCASIONAL GALES TO
35 KT. RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN SHOWERS
OVERNIGHT. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.SUNDAY...EAST WINDS TO 30 KT BECOMING NORTHEAST. RAIN SHOWERS
WITH A CHANCE OF THUNDERSTORMS IN THE MORNING...THEN RAIN SHOWERS
IN THE AFTERNOON. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
.SUNDAY NIGHT...EAST WINDS TO 30 KT BECOMING SOUTHEAST 15 TO
25 KT. RAIN SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.MONDAY...SOUTH WINDS TO 30 KT. CHANCE OF RAIN SHOWERS. WAVES
4 TO 6 FT OCCASIONALLY TO 8 FT.
.TUESDAY...WEST GALES TO 35 KT. WAVES 6 TO 9 FT OCCASIONALLY TO
11 FT.

$$
LMZ761-282130-
MAFOR 2815/
MICHIGAN NORTH 12530 11520 11510 11720 13830. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT
THIS AFTERNOON. WAVES 2 TO 4 FT THIS EVENING BUILDING TO 3 TO 5
FT OCCASIONALLY TO 7 FT OVERNIGHT INTO SATURDAY MORNING.

MICHIGAN SOUTH 11610 11310 12110 11120 11130 12140. CHANCE OF
RAIN SHOWERS THIS AFTERNOON AND EVENING. WAVES 2 TO 4 FT
SUBSIDING TO 1 TO 3 FT THIS AFTERNOON. WAVES BUILDING TO 4 TO 6
FT OCCASIONALLY TO 8 FT TONIGHT...FURTHER BUILDING TO 6 TO 9 FT
OCCASIONALLY TO 11 FT SATURDAY MORNING.

$$

MTF

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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