Great Lakes Forecast
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FZUS63 KLOT 121340
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
840 AM CDT Thu Oct 12 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 ridge of high pressure of 30.2 inches will move
across the lake today. Low pressure will move across Hudson Bay
Friday...with a trailing cold front moving down the lake Friday
night. This front will become stationary over the southern tip of
the lake Saturday...as low pressure of 29.6 inches develops over
the Central Plains. This low will lift across the middle
Mississippi Valley Saturday night causing the front to surge back
north as a warm front. The low will continue northeast across the
lake Saturday night while dragging another cold front across the
lake by Sunday morning.

LMZ261-362-364-366-563-565-567-868-122115-
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-
840 AM CDT Thu Oct 12 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 15 to 25
kt. Chance of showers overnight. Waves 3 to 5 ft.
.FRIDAY...Southwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers in the afternoon. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 2 to 4 ft.
.FRIDAY NIGHT...West winds 10 to 15 kt veering to northeast 15 to
25 kt overnight. Chance of showers. Waves 3 to 5 ft.
.SATURDAY...Northeast winds 15 to 25 kt becoming east. Chance of
showers. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds to 30 kt. Showers. Waves
building to 4 to 7 ft occasionally to 9 ft.
.SUNDAY...Northwest gales to 35 kt diminishing to 30 kt. Waves 6
to 9 ft occasionally to 12 ft.
.MONDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-122115-
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-
840 AM CDT Thu Oct 12 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southeast winds 10 to 20 kt becoming south.
Waves 2 to 4 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest. Slight
chance of showers overnight. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south 10 to 15 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...South winds 10 to 15 kt becoming southeast 10 to
20 kt. Showers likely in the evening...then showers with
thunderstorms likely overnight. Waves 1 to 3 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Showers. Chance of
thunderstorms in the afternoon. Waves 2 to 4 ft.
.SATURDAY NIGHT...South winds to 30 kt becoming southwest.
Showers. Waves building to 4 to 7 ft occasionally to 9 ft.
.SUNDAY...Northwest gales to 35 kt diminishing to 30 kt. Chance
of showers. Waves 6 to 9 ft occasionally to 12 ft.
.MONDAY...West winds 10 to 20 kt. Waves 3 to 5 ft.

$$
LMZ761-122115-
MAFOR 1215/
MICHIGAN NORTH 13320 11420 11430 13530. Chance of showers
overnight. Chance of showers Friday morning. Waves 2 to 4 feet
today. Waves 3 to 5 feet tonight. Waves 4 to 6 feet occasionally
to 8 feet Friday morning.

MICHIGAN SOUTH 12320 13420 13520. Waves 2 to 4 feet.

$$

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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