Great Lakes Forecast
Issued by NWS

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824
FZUS63 KLOT 201445
GLFLM

OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
845 AM CST MON FEB 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...A 30.3 INCH HIGH IS OVER THE UPPER OHIO VALLEY WHILE
A 29.6 INCH LOW IS OVER THE DAKOTAS. THE HIGH WILL REACH THE EAST
COAST THIS AFTERNOON WHILE THE LOW WILL MOVE OVER MANITOBA. THE
LOW DEEPENS TO 29.2 INCHES AS IT REACHES JAMES BAY AND ITS COLD
FRONT WILL PASS OVER THE LAKE EARLY TUESDAY MORNING. A WEAK HIGH
PRESSURE RIDGE AVERAGING 29.9 BUILDS OVER THE SOUTHERN MISSISSIPPI
VALLEY TUESDAY THEN A 29.6 INCH LOW MOVES OVER THE NORTHERN
PLAINS. THE LOW DEEPENS TO AROUND 29.4 INCHES AS IT PASSES OVER
THE WESTERN GREAT LAKES WEDNESDAY EVENING.

LMZ261-362-364-366-563-565-567-868-202215-
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-
845 AM CST MON FEB 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...SOUTHEAST WINDS 10 TO 20 KT INCREASING TO 20 TO
25 KT. WAVES 2 TO 4 FT BUILDING TO 3 TO 6 FT OCCASIONALLY TO 8
FT.
.TONIGHT...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST AFTER MIDNIGHT.
OCCASIONAL GALES TO 35 KT ARE POSSIBLE DURING THE EVENING. RAIN
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS. WAVES 6 TO 9 FT
OCCASIONALLY TO 11 FT.
.TUESDAY...WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT OCCASIONALLY TO 7
FT.
.TUESDAY NIGHT...SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST.
WAVES 2 TO 4 FT.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. CHANCE
OF RAIN IN THE AFTERNOON. WAVES 2 TO 4 FT.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KT VEERING TO NORTHWEST
15 TO 25 KT. CHANCE OF RAIN AND LIGHT FREEZING RAIN. WAVES 2 TO 4
FT.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KT BECOMING NORTH 10 TO
20 KT. WAVES 2 TO 4 FT.
.FRIDAY...EAST GALES TO 35 KT. RAIN AND SNOW. WAVES 7 TO 10 FT
OCCASIONALLY TO 13 FT.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-202215-
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-
845 AM CST MON FEB 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...SOUTHEAST WINDS 10 TO 20 KT INCREASING TO 20 TO
25 KT. AREAS OF FOG THROUGH MID MORNING. WAVES 2 TO 4 FT BUILDING
TO 3 TO 5 FT OCCASIONALLY TO 7 FT.
.TONIGHT...SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO 25 KT
AFTER MIDNIGHT. CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS IN THE EVENING...THEN RAIN SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 5 TO 8 FT OCCASIONALLY TO
10 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
.TUESDAY...SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 3 TO 5 FT
OCCASIONALLY TO 7 FT SUBSIDING TO 1 TO 3 FT.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST.
WAVES 1 TO 3 FT.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH 15 TO
25 KT. WAVES 2 TO 4 FT.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KT BECOMING NORTHWEST
10 TO 20 KT LATE. WAVES 2 TO 4 FT.
.THURSDAY...NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
.FRIDAY...EAST GALES TO 40 KT BECOMING SOUTHEAST. RAIN WITH
POSSIBLE RAIN SHOWERS AND THUNDERSTORMS LIKELY. WAVES 7 TO 10 FT
OCCASIONALLY TO 13 FT.

$$
LMZ761-202215-
MAFOR 2016/
MICHIGAN NORTH 12320 11330 12446 19456 12546 11620. WAVES 2 TO 4
FT BUILDING TO 3 TO 6 FT OCCASIONALLY TO 8 FT TODAY THEN TO 6 TO
9 FT OCCASIONALLY TO 11 FT TONIGHT. WAVES 4 TO 6 FT OCCASIONALLY
TO 8 FT TUESDAY MORNING.

MICHIGAN SOUTH 11323 12330 11440 11446 12536 11520. CHANCE OF
SHOWERS THIS EVENING AND TUESDAY MORNING. WAVES 2 TO 4 FT
BUILDING TO 3 TO 5 FT OCCASIONALLY TO 7 FT TODAY. WAVES 5 TO 8 FT
OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT
TONIGHT. WAVES 3 TO 5 FT OCCASIONALLY TO 7 FT TUESDAY MORNING.

$$

BMD

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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