Great Lakes Forecast
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FZUS63 KLOT 220139
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
839 PM 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...High pressure averaging 30.1 inches will persist
across the eastern U.S. through early next week. Low pressure of
29.5 inches is approaching Hudson Bay. A weak cold front over the
central portion of the lake this afternoon will lift north as a
warm front overnight. 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.

LMZ261-362-364-366-563-565-567-868-220930-
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-
839 PM CDT Thu Sep 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Southeast winds 10 to 15 kt becoming south.
Areas of fog. Slight chance of showers overnight. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Areas of fog in the morning.
Waves 2 to 4 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 3 to 5 ft.
.SATURDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY NIGHT THROUGH MONDAY...South winds 10 to 20 kt. Waves
2 to 4 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220930-
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-
839 PM CDT Thu Sep 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt. Waves 1 to 3 ft.
.SATURDAY AND SATURDAY NIGHT...South winds 10 to 15 kt. Waves
1 to 3 ft.
.SUNDAY THROUGH MONDAY...Southeast winds 10 to 15 kt. Waves 1
to 3 ft.
.TUESDAY...South winds 10 to 15 kt. Waves 1 to 3 ft.

$$
LMZ761-220930-
MAFOR 2203/
MICHIGAN NORTH 11303 13413 14420. Waves 1 to 2 feet overnight.
Waves 2 to 4 feet Friday. Waves 3 to 5 feet Friday evening.

MICHIGAN SOUTH 11310 14410 13420. Waves 1 to 2 feet overnight.
Waves 1 to 3 feet Friday and Friday evening.

$$

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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