Great Lakes Forecast
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086
FZUS63 KLOT 181948
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
248 PM CDT Fri Aug 18 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 29.5 inches is centered just east of
Lake Superior this afternoon and will lift east of James Bay
Saturday and continue across northern Quebec Sunday. A ridge
averaging 30.0 inches stretches along the Mississippi Valley this
afternoon and will spread across much of the Midwest Saturday. Low
pressure of 29.8 inches will form over the central Great Plains
this weekend and remain there through Tuesday while another low of
29.5 inches moves from northern Manitoba Saturday to Quebec
Tuesday as a trailing cold front sweeps south across Lake
Michigan.

LMZ261-362-364-366-563-565-567-868-190330-
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-
248 PM CDT Fri Aug 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds 15 to 25 kt becoming west 10 to 15 kt.
Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest early in
the afternoon increasing to 10 to 20 kt late. Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SUNDAY NIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of showers and thunderstorms overnight. Waves 2 to
4 ft.
.MONDAY...Southwest winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 2 to 4 ft.
.MONDAY NIGHT...Southwest winds 10 to 20 kt. Chance of showers
and thunderstorms. Waves 2 to 4 ft.
.TUESDAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt.
Showers and thunderstorms likely. Waves 2 to 4 ft building to
3 to 5 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190330-
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-
248 PM CDT Fri Aug 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...West winds 10 to 20 kt becoming northwest 10 to 15 kt.
Slight chance of showers and thunderstorms this evening...then
chance of showers and slight chance of thunderstorms overnight.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SATURDAY...Northwest winds 10 to 15 kt becoming variable 5 to 10
kt. Waves 1 to 3 ft.
.SATURDAY NIGHT...South winds 10 to 15 kt becoming southwest.
Waves 1 to 2 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
2 to 4 ft.
.MONDAY...South winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 2 to 4 ft.
.MONDAY NIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Chance of showers and thunderstorms. Waves 2 to 4 ft.
.TUESDAY...Southwest winds 10 to 20 kt becoming west 15 to 25 kt.
Showers and thunderstorms likely. Waves 3 to 5 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft.

$$

LMZ761-190330-
MAFOR 1821/
MICHIGAN NORTH 11730 12720 14610 11510. Waves 3 to 5 feet
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Saturday.

MICHIGAN SOUTH 11620 12610 14710 11900. Chance of showers
overnight. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.
Waves 1 to 3 feet Saturday.

$$

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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