Great Lakes Forecast
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000
FZUS63 KLOT 201333
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
833 AM CDT Wed Sep 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 high pressure ridge averaging 30.0 inches will
remain over the eastern U.S. through early next week. The 29.3
inch low over Saskatchewan will deepen to 29.1 inches and then
weaken as it reaches Hudson Bay Friday. High pressure of 29.9
inches will form over the central Plains this afternoon and
pass over Lake Superior tonight. A trough of low pressure
averaging 29.7 inches will stretch from the northern Mississippi
Valley through the southern Plains Friday. The trough will remain
stationary and gradually weaken through early next week.

LMZ261-362-364-366-563-565-567-868-202130-
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-
833 AM CDT Wed Sep 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southeast winds 10 to 20 kt becoming south 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt veering to north 10 to 15 kt.
Chance of showers and thunderstorms in the evening...then chance
of showers and slight chance of thunderstorms overnight. Waves 3
to 5 ft subsiding to 2 to 4 ft.
.THURSDAY...North winds 10 to 20 kt becoming northeast late in
the morning...then diminishing to 10 to 15 kt early in the
afternoon becoming east 5 to 10 kt late. Waves 1 to 3 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south
10 to 20 kt. 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...South winds 10 to 20 kt. Waves 1 to 3 ft.
.SUNDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-202130-
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-
833 AM CDT Wed Sep 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southeast winds 10 to 20 kt increasing to 15 to
25 kt. Waves 1 to 3 ft building to 3 to 5 ft from early afternoon
on.
.TONIGHT...South winds 10 to 20 kt. Chance of showers and
thunderstorms in the evening...then chance of showers and slight
chance of thunderstorms overnight. Waves 3 to 5 ft subsiding to
2 to 4 ft.
.THURSDAY...South winds 10 to 15 kt becoming southeast. Waves
1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...Southeast winds 10 to 20 kt becoming south. Waves
1 to 3 ft.
.SATURDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.SUNDAY...South winds 10 to 20 kt becoming southeast. Waves 1 to
2 ft.

$$
LMZ761-202130-
MAFOR 2015/
MICHIGAN NORTH 11320 12430 12420 11510 12810. Chance of showers
and thunderstorms late. Chance of showers Thursday morning. Waves
2 to 4 ft building to 3 to 5 ft this afternoon, then subsiding to
2 to 4 ft overnight. Waves 1 to 3 ft Thursday morning.

MICHIGAN SOUTH 11320 12330 13420 12410. Chance of showers and
thunderstorms tonight. Chance of showers Thursday morning. Waves 1
to 3 ft building to 3 to 5 ft occasionally to 7 ft this afternoon,
then subsiding to 2 to 4 ft overnight. Waves 1 to 3 ft Thursday
morning.

$$

KMD

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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