Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 181953
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
253 PM CDT TUE APR 18 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 MINNESOTA TUESDAY
AFTERNOON WILL TRACK EAST TO LAKE SUPERIOR AND CONTINUE INTO
SOUTHERN ONTARIO TONIGHT...DRAGGING A COLD FRONT ACROSS THE LAKE.
THE COLD FRONT SHOULD PUSH SOUTH OF THE LAKE BY WEDNESDAY MORNING
WHILE HIGH PRESSURE OF 30.4 INCHES BUILDS ACROSS CENTRAL CANADA
AND A NEW LOW PRESSURE OF 29.6 INCHES DEVELOPS OVER THE CENTRAL
PLAINS. THIS LOW WILL PASS OVER SOUTHERN OR CENTRAL LAKE MICHIGAN
THURSDAY MORNING WHILE HIGH PRESSURE OF 30.3 INCHES SPREADS
ACROSS THE NORTHERN AND CENTRAL PLAINS.

LMZ261-362-364-366-563-565-567-868-190345-
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-
253 PM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...SOUTH WINDS 15 TO 25 KT VEERING TO WEST. SCATTERED
RAIN SHOWERS WITH ISOLATED THUNDERSTORMS THIS EVENING...THEN
ISOLATED RAIN SHOWERS OVERNIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO
9 FT.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 15 TO
25 KT. SCATTERED RAIN SHOWERS IN THE AFTERNOON. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS TO 30 KT BECOMING EAST GALES
TO 35 KT LATE. RAIN SHOWERS LIKELY IN THE EVENING...THEN RAIN
SHOWERS OVERNIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT BUILDING
TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
.THURSDAY...EAST GALES TO 35 KT VEERING TO SOUTH TO 30 KT. RAIN
SHOWERS LIKELY IN THE MORNING...THEN CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. WAVES 6 TO 9 FT OCCASIONALLY TO 11 FT.
.THURSDAY NIGHT...NORTHWEST WINDS 15 TO 25 KT INCREASING TO
30 KT. CHANCE OF RAIN SHOWERS. WAVES 3 TO 5 FT OCCASIONALLY TO
7 FT.
.FRIDAY...NORTHWEST WINDS TO 30 KT BECOMING NORTH 10 TO 20 KT IN
THE AFTERNOON. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT SUBSIDING TO
2 TO 4 FT.
.FRIDAY NIGHT...NORTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.SATURDAY...NORTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
.SUNDAY...NORTH WINDS 15 TO 25 KT. WAVES 1 TO 3 FT BUILDING TO
3 TO 5 FT OCCASIONALLY TO 7 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190345-
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-
253 PM CDT TUE APR 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST. SCATTERED
RAIN SHOWERS WITH ISOLATED THUNDERSTORMS. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.WEDNESDAY...WEST WINDS 10 TO 20 KT BECOMING NORTH LATE IN THE
MORNING...THEN INCREASING TO 15 TO 25 KT EARLY IN THE AFTERNOON
AND TO 30 KT LATE. SCATTERED RAIN SHOWERS AND THUNDERSTORMS.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.WEDNESDAY NIGHT...NORTHEAST WINDS TO 30 KT VEERING TO SOUTHEAST
15 TO 25 KT. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS IN THE
EVENING...THEN RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
OVERNIGHT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
.THURSDAY...SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST. CHANCE OF
RAIN SHOWERS IN THE MORNING. WAVES 3 TO 5 FT OCCASIONALLY TO
7 FT.
.THURSDAY NIGHT...NORTHWEST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT.
.FRIDAY...NORTHWEST WINDS 15 TO 25 KT BECOMING NORTH 10 TO 20 KT.
WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT.
.FRIDAY NIGHT...NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST. WAVES
2 TO 4 FT.
.SATURDAY...NORTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 2 TO 4 FT.
.SUNDAY...NORTH WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES 1 TO
3 FT BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT.

$$

LMZ761-190345-
MAFOR 1821/
MICHIGAN NORTH 12430 11440 11540 11630 11720 11820 11830.
SCATTERED RAIN SHOWERS EARLY THIS EVENING AND WEDNESDAY. WAVES 4
TO 7 FT OCCASIONALLY TO 9 FT TONIGHT. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT WEDNESDAY.

MICHIGAN SOUTH 13430 12530 11620 11820 11830. SCATTERED SHOWERS
LATE THIS EVENING. SCATTERED RAIN SHOWERS AND THUNDERSTORMS
WEDNESDAY. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO
5 FT OCCASIONALLY TO 7 FT TONIGHT. WAVES 3 TO 5 FT OCCASIONALLY
TO 7 FT WEDNESDAY.

$$


JEE/LENNING

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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