Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 111355
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
855 AM CDT Wed Oct 11 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 of 30.3 inches over the upper lakes
today will move to Quebec tonight. Weak low pressure of 29.9
inches over northeastern Illinois will move to Ohio this evening.
A broad high pressure ridge averaging 30.1 inches will linger
over the eastern lakes through Friday. A cold front is expected to
move south across the lake Friday night as low pressure develops
over the Central Plains. This low is expected to move across the
lakes region Saturday night into Sunday, with a trailing cold
front sweeping across Lake Michigan.

LMZ261-362-364-366-563-565-567-868-112115-
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-
855 AM CDT Wed Oct 11 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...East winds to 30 kt diminishing to 10 to 20 kt.
Chance of showers this morning. Waves 4 to 7 ft occasionally to
9 ft subsiding to 3 to 5 ft.
.TONIGHT...East winds 10 to 20 kt becoming southeast. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers overnight. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt. Chance of showers in the
afternoon. Waves 2 to 4 ft.
.FRIDAY NIGHT...Southwest winds 15 to 25 kt veering to north.
Showers. Waves 3 to 5 ft.
.SATURDAY...Northeast winds to 30 kt. Chance of showers. Waves
4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northeast gales to 35 kt becoming north. Showers
likely. Waves 7 to 10 ft occasionally to 13 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-112115-
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-
855 AM CDT Wed Oct 11 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Northeast winds to 30 kt diminishing to 15 to 25
kt. Scattered showers this morning...then slight chance of rain
this afternoon. Waves 8 to 11 ft occasionally to 14 ft subsiding
to 6 to 9 ft occasionally to 12 ft.
.TONIGHT...East winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.THURSDAY...East winds 10 to 20 kt becoming southeast 10 to 15
kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south. Waves 2
to 4 ft.
.FRIDAY NIGHT...South winds 15 to 25 kt becoming southwest.
Showers likely. Waves 3 to 5 ft.
.SATURDAY...Southwest winds to 30 kt backing to southeast 15 to
25 kt. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft.
.SUNDAY...West gales to 35 kt becoming northwest. Chance of
showers. Waves 7 to 10 ft occasionally to 13 ft.

$$
LMZ761-112115-
MAFOR 1115/
MICHIGAN NORTH 12230 13220 13320. Scattered showers late this
morning. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3
to 5 feet today. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight. Waves 2 to 4 feet Thursday morning.

MICHIGAN SOUTH 12140 11130 12230 13220. Scattered showers today.
Waves 8 to 11 feet occasionally to 14 feet subsiding to 6 to 9
feet occasionally to 12 feet today. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 3 to 5 feet tonight. Waves 2
to 4 feet Thursday morning.

$$

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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