Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 250156
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
856 PM CDT Tue Apr 24 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...Low pressure of 29.8 inches remains over the
southeastern United States with weak troughing extending into the
Middle Mississippi Valley. High pressure of 30.6 inch over the
northern Great Plains will build into the Upper Midwest tonight
and Wednesday. The ridge will move across Lake Michigan Wednesday
night. Low pressure of 29.4 inches will move across Hudson Bay
Wednesday night and a trailing cold front will push across Lake
Michigan Thursday night. A weak low of 23.7 inches will pass over
the lake Friday night.

LMZ261-362-364-366-563-565-567-868-250915-
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-
856 PM CDT Tue Apr 24 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...North winds to 30 kt. Isolated rain showers
this evening. Waves 5 to 8 ft occasionally to 10 ft building to 8
to 11 ft occasionally to 14 ft.
.WEDNESDAY...North winds 20 to 25 kt diminishing to 10 to 20 kt.
Waves 8 to 11 ft occasionally to 14 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt backing to
southwest. Waves 3 to 5 ft subsiding to 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt becoming south. Waves
1 to 3 ft building to 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt veering to north 15 to
25 kt. Chance of rain and light freezing rain overnight. Waves
3 to 5 ft.
.FRIDAY...North winds 15 to 25 kt becoming west 10 to 20 kt.
Waves 3 to 5 ft.
.FRIDAY NIGHT...Southwest winds 10 to 15 kt becoming northwest 10
to 20 kt. Waves 1 to 3 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft building to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-250915-
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-
856 PM CDT Tue Apr 24 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northeast winds to 30 kt becoming north. Waves
5 to 8 ft occasionally to 10 ft building to 8 to 11 ft
occasionally to 14 ft overnight.
.WEDNESDAY...North winds to 30 kt diminishing to 15 to 25 kt.
Waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to 10 ft
occasionally to 13 ft .
.WEDNESDAY NIGHT...North winds 10 to 20 kt diminishing to 10 to
15 kt late in the evening, then becoming northwest to 5 to 10 kt
after midnight. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 2 to 4 ft.
.THURSDAY...Southwest winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 15 kt veering to northwest
15 to 25 kt overnight. Chance of rain overnight. Waves 1 to 3 ft
building to 3 to 5 ft.
.FRIDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.FRIDAY NIGHT...Southwest winds 10 to 20 kt becoming west. Waves
2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt.
Waves 1 to 2 ft building to 2 to 4 ft.

$$
LMZ761-250915-
MAFOR 2503/
MICHIGAN NORTH 14840 12830 11820 11110. Waves 5 to 8 ft
occasionally to 10 ft building to 8 to 11 ft occasionally to 14
ft overnight. Waves 8 to 11 ft occasionally to 14 ft subsiding to
4 to 7 ft occasionally to 9 ft Wednesday. Waves 3 to 5 ft
subsiding to 1 to 3 ft Wednesday evening.

MICHIGAN SOUTH 14840 11840 12830 11820. Waves 5 to 8 ft
occasionally to 10 ft building to 8 to 11 ft occasionally to 14
ft overnight. Waves 8 to 12 ft occasionally to 16 ft subsiding to
7 to 10 ft occasionally to 13 ft Wednesday. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft
Wednesday evening.

$$

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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