Great Lakes Forecast
Issued by NWS

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002
FZUS63 KLOT 200750
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
250 AM CDT SAT MAY 20 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 29.7 INCHES OVER KANSAS WILL MOVE
NORTH TO LAKE SUPERIOR BY EARLY SUNDAY EVENING WITH A TRAILING
FRONT MOVING ACROSS THE LATE TONIGHT AND SUNDAY MORNING. THE LOW
WILL SLOWLY MOVE NORTHEAST INTO QUEBEC MONDAY NIGHT INTO TUESDAY.
A COLD FRONT EXTENDING WEST FROM THIS LOW WILL DEVELOP MONDAY THEN
PIVOT SOUTHEAST AROUND THE LOW AND MOVE ACROSS THE LAKE TUESDAY.
LOW PRESSURE OF 29.7 INCHES WILL DEVELOP ALONG THE SOUTHEAST
ATLANTIC COAST TUESDAY NIGHT THEN TRACK NORTH UP THE EASTERN
SEABOARD WEDNESDAY INTO WEDNESDAY NIGHT. THE PRESSURE GRADIENT
OVER THE LAKE WILL TIGHTEN BETWEEN THAT LOW AND A RIDGE OF HIGH
PRESSURE AVERAGING 29.9 INCHES WHICH WILL EXTEND FROM THE UPPER
MISSISSIPPI VALLEY SOUTH INTO THE SOUTHERN PLAINS BY WEDNESDAY
AFTERNOON.

LMZ261-362-364-366-563-565-567-868-201545-
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-
250 AM CDT SAT MAY 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 15 TO 25 KT
THIS MORNING...THEN INCREASING TO 30 KT THIS AFTERNOON. SHOWERS
DEVELOPING BY AFTERNOON. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT.
.TONIGHT...EAST WINDS TO 30 KT BECOMING SOUTHEAST. SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS. WAVES 4 TO 6 FT OCCASIONALLY TO 8
FT.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KT BECOMING SOUTHWEST. CHANCE
OF SHOWERS IN THE MORNING. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF RAIN SHOWERS IN
THE MORNING. WAVES 2 TO 4 FT.
.MONDAY NIGHT...WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
WAVES 1 TO 3 FT.
.TUESDAY...NORTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF RAIN SHOWERS. WAVES 1 TO 2 FT BUILDING TO 2 TO 4 FT.
.WEDNESDAY...NORTH WINDS 10 TO 20 KT. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-201545-
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-
250 AM CDT SAT MAY 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...NORTHEAST WINDS 15 TO 25 KT BECOMING EAST THIS
MORNING...THEN SOUTHEAST TO 30 KT LATE THIS AFTERNOON. OCCASIONAL
SHOWERS AND A CHANCE OF A THUNDERSTORM...MAINLY THIS AFTERNOON.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TONIGHT...SOUTHEAST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT
LATE IN THE EVENING...THEN DIMINISHING TO 10 TO 20 KT AFTER
MIDNIGHT BECOMING SOUTH LATE. SHOWERS LIKELY WITH A CHANCE OF
THUNDERSTORMS IN THE EVENING...THEN CHANCE OF SHOWERS OVERNIGHT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.SUNDAY...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST 15 TO 25 KT.
WAVES 2 TO 4 FT.
.SUNDAY NIGHT...WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES
2 TO 4 FT.
.MONDAY...SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 2 TO 4 FT.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. CHANCE OF SHOWERS. WAVES 1 TO 3 FT.
.TUESDAY...SOUTHEAST WINDS 10 TO 15 KT BACKING TO NORTHEAST 10 TO
20 KT. RAIN SHOWERS LIKELY. WAVES 1 TO 2 FT BUILDING TO 2 TO
4 FT.
.WEDNESDAY...NORTH WINDS 15 TO 25 KT. CHANCE OF RAIN SHOWERS.
WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.

$$

LMZ761-201545-
MAFOR 2009/
MICHIGAN NORTH 11120 12230 14246 11346. WAVES 2 TO 4 FT BUILDING
TO 4 TO 6 FT OCCASIONALLY TO 8 FT TODAY AND CONTINUING 4 TO 6 FT
OCCASIONALLY TO 8 FT TONIGHT.

MICHIGAN SOUTH 12136 12236 12346 11336 11320. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT TODAY AND 3 TO 5 OCCASIONALLY TO 7 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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