Great Lakes Forecast
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FZUS63 KLOT 210741
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
241 AM CDT Thu Sep 21 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 high pressure ridge averaging 30.1 inches will
remain over the eastern U.S. through early next week. Low pressure
of 29.4 inches over northern Manitoba will move to Hudson Bay
Friday. A weak cold front will move over the central portion of
the lake this morning, and then lift back north as a warm front
tonight. A trough of low pressure averaging 29.6 inches will
stretch from the northern Mississippi Valley through the southern
Plains Friday. This trough will remain stationary and gradually
weaken through early next week.

LMZ261-362-364-366-563-565-567-868-211515-
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-
241 AM CDT Thu Sep 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...North winds 10 to 15 kt becoming east 5 to 10 kt late
this afternoon. Patchy fog this morning. Waves 2 to 4 ft subsiding
to 1 to 3 ft.
.TONIGHT...Southeast winds 5 to 10 kt increasing to 10 to 15 kt
late in the evening...then becoming south 10 to 20 kt overnight.
Slight chance of showers and thunderstorms. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south. Waves
2 to 4 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY...South winds 10 to 20 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211515-
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-
241 AM CDT Thu Sep 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 15 kt becoming southeast. Patchy fog
this morning. Waves 1 to 3 ft.
.TONIGHT...Southeast winds 10 to 20 kt becoming south. Waves 1 to
3 ft.
.FRIDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt. Waves 1 to 3 ft.
.SATURDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.SATURDAY NIGHT...Southeast winds 10 to 20 kt becoming south
10 to 15 kt. Waves 1 to 2 ft.
.SUNDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.MONDAY...South winds 10 to 15 kt becoming southeast. Waves 1 to
2 ft.

$$

LMZ761-211515-
MAFOR 2109/
MICHIGAN NORTH 11810 12110 11100 11200 11300 11310 11420. Waves 2
to 4 feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet
tonight.

MICHIGAN SOUTH 13410 12310 11320 12420. Waves 1 to 3 feet.

$$


JEE

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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