Great Lakes Forecast
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FZUS63 KLOT 120745
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
245 AM CDT Sat Aug 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...Low pressure of 29.8 inches east of Lake Huron will
continue to move east into Quebec today. Meanwhile high pressure of
30.1 inches over the upper Mississippi Valley will build east into
the western Great Lakes tonight and Sunday. A ridge of high pressure
will linger across Great Lakes into Tuesday... as low pressure at
29.6 inches then moves east across the northern Plains Wednesday and
reaches western Lake Superior by Thursday.

LMZ261-362-364-366-563-565-121515-
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-
245 AM CDT Sat Aug 12 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.TODAY...North winds 15 to 25 kt becoming northwest 10 to 15 kt.
Waves 4 to 6 ft occasionally to 8 ft... subsiding to 2 to 4 ft.
.TONIGHT...Northwest winds 10 to 15 kt becoming west. Waves
subsiding to 1 to 3 ft.
.SUNDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 2 ft.
.MONDAY...Southwest winds 5 to 15 kt. Waves 1 ft or less.
.MONDAY NIGHT...Southwest winds 5 to 10 kt. Waves 1 ft or less.
.TUESDAY...Southwest winds 5 to 10 kt. Waves 1 ft or less.
.WEDNESDAY...Southeast winds 10 to 20 kt. Waves 1 to 3 ft
building to 2 to 4 ft.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-121515-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 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 Pentwater to Manistee MI 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-
245 AM CDT Sat Aug 12 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TODAY...North winds 10 to 20 kt. Isolated showers this morning.
Waves 4 to 6 ft occasionally to 8 ft.
.TONIGHT...North winds 10 to 20 kt becoming northwest 5 to 10 kt.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SUNDAY...Southeast winds 5 to 10 kt becoming southwest. Waves
1 to 2 ft.
.SUNDAY NIGHT...South winds 5 to 10 kt. Waves 1 ft or less.
.MONDAY...South winds 5 to 10 kt. Waves nearly calm.
.MONDAY NIGHT...Southeast winds 5 to 10 kt. Waves nearly calm.
.TUESDAY...Southeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.
.WEDNESDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers. Waves 2 to 4 ft building to 3 to 5 ft.

$$

LMZ761-121515-
MAFOR 1209/
MICHIGAN NORTH 12830 11820 11720 12710 11700 11600. Waves 4 to 6
feet occasionally to 8 feet subsiding to 3 to 5 feet today. Waves
2 to 4 feet subsiding to 1 foot or less tonight.

MICHIGAN SOUTH 15820 11810 11710. Waves 4 to 6 feet occasionally
to 8 feet today. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight.

$$


Ed F

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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