Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 230758
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
258 AM CDT THU MAR 23 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...HIGH PRESSURE OF 30.6 INCHES OVER THE EASTERN GREAT
LAKES REGION WILL MOVE SOUTHEAST TO THE MID ATLANTIC COAST BY
LATE THIS AFTERNOON. LOW PRESSURE OF 29.4 INCHES WILL THEN
DEVELOP OVER THE PLAINS TONIGHT INTO FRIDAY. AS THIS OCCURS...A
COLD FRONT WILL GRADUALLY SHIFT SOUTHWARD DOWN THE LAKE FRIDAY
BEFORE STALLING OUT NEAR THE SOUTHERN END OF THE LAKE SATURDAY
MORNING. THE LOW WILL WEAKEN TO AROUND 29.7 INCHES AS IT MOVES
SLOWLY NORTHEAST OVER NORTHERN ILLINOIS THIS WEEKEND.

LMZ261-362-364-366-563-565-567-868-231515-
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-
258 AM CDT THU MAR 23 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...SOUTH WINDS 10 TO 20 KT INCREASING TO 30 KT THIS
AFTERNOON. WAVES 2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO
10 FT.
.TONIGHT...SOUTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.
CHANCE OF RAIN SHOWERS IN THE EVENING...THEN RAIN SHOWERS
OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KT BECOMING NORTHEAST 10 TO 20
KT. RAIN SHOWERS LIKELY IN THE MORNING...THEN RAIN SHOWERS IN THE
AFTERNOON. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
.FRIDAY NIGHT...NORTHEAST WINDS 15 TO 25 KT INCREASING TO 30 KT.
RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN SHOWERS OVERNIGHT.
WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.SATURDAY...NORTHEAST WINDS TO 30 KT BECOMING EAST. CHANCE OF
RAIN SHOWERS IN THE MORNING...THEN RAIN SHOWERS LIKELY IN THE
AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KT. RAIN SHOWERS LIKELY.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
.SUNDAY...EAST WINDS 10 TO 20 KT BECOMING NORTHEAST. CHANCE OF
RAIN SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.MONDAY...NORTH WINDS 10 TO 20 KT DIMINISHING TO 5 TO 10 KT IN
THE AFTERNOON. WAVES 1 TO 3 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-231515-
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-
258 AM CDT THU MAR 23 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH 15 TO 25 KT
THIS MORNING...THEN INCREASING TO 30 KT THIS AFTERNOON. WAVES 2
TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.TONIGHT...SOUTH WINDS AROUND 25 KT DIMINISHING TO 10 TO 20 KT.
CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS IN THE
EVENING...THEN CHANCE OF RAIN SHOWERS OVERNIGHT. WAVES 3 TO 6 FT
OCCASIONALLY TO 8 FT.
.FRIDAY...SOUTH WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS. WAVES
3 TO 5 FT OCCASIONALLY TO 7 FT.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KT BECOMING NORTHEAST. PATCHY
DENSE FOG. RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN SHOWERS
OVERNIGHT. WAVES 2 TO 4 FT.
.SATURDAY...NORTHEAST WINDS 10 TO 20 KT BECOMING EAST. PATCHY
DENSE FOG. RAIN SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SATURDAY NIGHT...EAST WINDS 10 TO 20 KT. PATCHY DENSE FOG. RAIN
SHOWERS LIKELY. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY...EAST WINDS 10 TO 20 KT BECOMING NORTHEAST 10 TO 15 KT.
PATCHY DENSE FOG. RAIN SHOWERS LIKELY. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 2 TO 4 FT.
.MONDAY...NORTH WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.

$$

LMZ761-231515-
MAFOR 2309/
MICHIGAN NORTH 11420 12430 13440 12436. CHANCE OF RAIN SHOWERS
LATE TONIGHT. WAVES 2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY
TO 10 FT TODAY. WAVES SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT
TONIGHT.

MICHIGAN SOUTH 11320 12430 12440 13430. CHANCE OF RAIN SHOWERS
LATE THIS EVENING. WAVES 2 TO 4 FT BUILDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT TODAY. WAVES 3 TO 6 FT OCCASIONALLY TO 8 FT
TONIGHT.

$$


KJB

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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