Great Lakes Forecast
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FZUS63 KLOT 200736
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
236 AM CDT Fri Apr 20 2018

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 30.6 inches will spread over the
lake this afternoon and inch its way eastward from there by the
end of the weekend, gradually weakening as it does. The high will
move east on Monday. Low pressure is expected to develop south of
the lake and move east sometime Tuesday night into Wednesday.


LMZ261-362-364-366-563-565-567-868-201530-
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-
236 AM CDT Fri Apr 20 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northwest winds 5 to 10 kt backing to southwest by early
afternoon, and increasing to 10 to 15 kt late in the day. Waves 1
to 2 ft.
.TONIGHT...Southwest winds 10 to 15 kt. Waves 1 to 2 ft.
.SATURDAY...Southwest winds 5 to 10 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...South winds less than 10 kt. Waves around 1 ft.
.SUNDAY...Southeast winds less than 10 kt becoming east. Waves
1 ft or less.
.SUNDAY NIGHT...East winds 5 to 10 kt becoming southeast. Waves
1 ft or less.
.MONDAY...South winds 5 to 10 kt becoming southwest. Waves 1 ft
or less.
.TUESDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-201530-
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-
236 AM CDT Fri Apr 20 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...West winds 5 to 10 kt becoming variable in the early
afternoon. Waves 1 to 3 ft.
.TONIGHT...East winds 5 to 10 kt. Waves around 1 ft.
.SATURDAY...East winds less than 10 kt becoming northeast. Waves
around 1 ft.
.SATURDAY NIGHT...East winds 5 to 10 kt. Waves 1 ft or less.
.SUNDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...Northeast winds 10 to 15 kt becoming east. Waves
1 to 3 ft.
.MONDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
3 ft.
.TUESDAY...South winds 5 to 10 kt becoming southeast. Waves 1 to 2
ft.

$$

LMZ761-201530-
MAFOR 2009/
MICHIGAN NORTH 12700 11600 11500 14510. Waves 1 to 2 ft.

MICHIGAN SOUTH 11710 12600 12900 13200. Waves 1 to 3 ft
diminishing to around 1 ft this evening.

$$

MTF

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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