Great Lakes Forecast
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FZUS63 KLOT 170755
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
255 AM CDT Thu Aug 17 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 over southeast Minnesota
will move into Lake Superior this evening and into Ontario on
Friday. The low`s cold front will sweep across the lake this
evening. The low will continue across Quebec through the weekend
as weak high pressure of 29.9 inches spreads over the lake. The
next cold front approaches the lake on Monday night.

LMZ261-362-364-366-563-565-171515-
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-
255 AM CDT Thu Aug 17 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.TODAY...Southeast winds to 30 kt becoming south 15 to 25 kt.
Showers likely with a chance of thunderstorms this morning...then
chance of showers and thunderstorms this afternoon. Waves 4 to
7 ft occasionally to 9 ft.
.TONIGHT...South winds 15 to 25 kt veering to west to 30 kt.
Chance of showers and slight chance of thunderstorms in the
evening...then chance of showers overnight. Waves 4 to 7 ft
occasionally to 9 ft.
.FRIDAY...Northwest winds to 30 kt diminishing to 15 to 25 kt.
Chance of showers in the morning. Waves 4 to 6 ft occasionally to
8 ft subsiding to 3 to 5 ft.
.FRIDAY NIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Southwest winds 10 to 20 kt. Waves 1 to 2 ft.
.SUNDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-171515-
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-
255 AM CDT Thu Aug 17 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TODAY...South winds 10 to 20 kt becoming southwest 15 to 25 kt.
Chance of showers and thunderstorms this morning...then chance of
showers and slight chance of thunderstorms this afternoon. Waves
4 to 7 ft occasionally to 9 ft.
.TONIGHT...Southwest winds to 30 kt becoming west. Slight chance
of showers. Waves 4 to 6 ft occasionally to 8 ft building to 5 to
8 ft occasionally to 10 ft.
.FRIDAY...West winds to 30 kt diminishing to 10 to 20 kt. Waves
5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.FRIDAY NIGHT...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...Northwest winds 5 to 10 kt becoming west 10 to 15 kt.
Waves 1 to 2 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 1 to 2 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft building to 1 to 3 ft.
.MONDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ761-171515-
MAFOR 1709/
MICHIGAN NORTH 11336 11346 14430 11540 11640. Chance of showers
and thunderstorms. Waves 4 to 7 feet occasionally to 9 feet
today...building to 5 to 8 feet occasionally to 10 feet tonight.

MICHIGAN SOUTH 11430 12420 13530 12640. Chance of showers and
thunderstorms early this morning. Chance of showers today. Waves
4 to 7 feet occasionally to 9 feet today. Waves 4 to 6 feet
occasionally to 8 feet building to 5 to 8 feet occasionally to 10
feet tonight.

$$

Lenning

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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