Great Lakes Forecast
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000
FZUS63 KLOT 260146
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
846 PM CDT Tue Jul 25 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 30.2 inches over New England will
slowly move off the east coast Wednesday night. Meanwhile, low
pressure of 29.5 inches over northwest Ontario will move east to
James Bay by Wednesday evening. A trailing surface trough will
slowly move south over the northern part of the lake Wednesday
evening. Another low pressure around 29.8 inches will develop
along this trough, just south of Lake Michigan Wednesday night,
and move east to the Mid Atlantic by Thursday night. High
pressure of 30.1 inches will build over the lake by Friday night
and hold through the weekend.

LMZ261-362-364-366-563-565-567-868-260800-
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-
846 PM CDT Tue Jul 25 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 15 to 25 kt increasing to 30 kt.
Chance of showers and slight chance of thunderstorms. Waves 3 to
5 ft building to 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY...South winds to 30 kt becoming southwest 10 to 20 kt.
Chance of showers and thunderstorms. Waves 5 to 8 ft occasionally
to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 kt veering to
northeast. Chance of showers and thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 1 to 3 ft.
.THURSDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Waves 2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.
.THURSDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt overnight. Waves 4 to 7 ft occasionally to 9 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north to 30 kt in
the afternoon. Waves 3 to 5 ft.
.FRIDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
15 kt overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.SUNDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-260800-
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-
846 PM CDT Tue Jul 25 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 2 to 4 ft building to 3 to 5 ft.
.WEDNESDAY...South winds 10 to 20 kt. Slight chance of showers
in the morning...then chance of showers and thunderstorms in the
afternoon. Waves 3 to 5 ft.
.WEDNESDAY NIGHT...South winds 10 to 20 kt backing to north.
Chance of showers and thunderstorms in the evening...then showers
and thunderstorms likely overnight. Waves 2 to 4 ft subsiding to
1 to 2 ft.
.THURSDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Chance of showers and thunderstorms in the morning. Waves 2 to
4 ft building to 4 to 7 ft occasionally to 9 ft.
.THURSDAY NIGHT...Northeast winds to 30 kt diminishing to 15 to
25 kt. Waves 5 to 8 ft occasionally to 10 ft.
.FRIDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.FRIDAY NIGHT...Northeast winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 1 to 3 ft.
.SUNDAY...Southeast winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 ft or less.

$$
LMZ761-260800-
MAFOR 2603/
MICHIGAN NORTH 11430 13440 11540 11530 12520. Chance of
showers and thunderstorms. Waves 3 to 5 ft building to 5 to 8
ft occasionally to 10 ft tonight...then subsiding to 4 to 6 ft
occasionally to 8 ft Wednesday.

MICHIGAN SOUTH 11320 11420 15420. Chance of showers and
thunderstorms Wednesday afternoon and Wednesday evening. Waves 2
to 4 ft building to 3 to 5 ft tonight. Waves 3 to 5 ft Wednesday.

$$

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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