Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 260138
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
838 PM CDT Wed Apr 25 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...Weak high pressure of 30.0 inches over Lake Michigan
tonight will move southeast Thursday. Low pressure of 29.7 inches
will cross Ontario Thursday, steering a cold front across the
lake Thursday night. A second low pressure of 29.7 inches will
move across the southern part of the lake Friday evening steering
another cold front down the lake. High pressure of 30.3 inches
will then build over the Great Lakes for 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-
838 PM CDT Wed Apr 25 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Variable winds 5 to 10 kt becoming southwest
10 to 15 kt overnight. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt becoming south. Waves
building to 2 to 4 ft.
.THURSDAY NIGHT...West winds 15 to 25 kt becoming north. Chance
of rain. Waves 3 to 5 ft building to 4 to 6 ft occasionally to
8 ft.
.FRIDAY...Northwest winds 10 to 20 kt diminishing to 10 to 15 kt.
Chance of rain showers in the afternoon. Waves 3 to 5 ft
subsiding to 1 to 3 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt increasing to 15 to 25
kt. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...North winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 15 kt becoming southwest. Waves
1 to 3 ft.
.MONDAY...Southwest winds to 30 kt becoming south. Waves 4 to
6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to
10 ft.

$$

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-
838 PM CDT Wed Apr 25 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 10 to 20 kt diminishing to 5 to 10
kt after midnight then becoming southwest by morning. Waves 4 to
6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY...Southwest winds 10 to 15 kt becoming south 10 to 20
kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt veering to north 15 to
25 kt. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8
ft.
.FRIDAY...North winds 10 to 20 kt becoming northeast 10 to 15 kt.
Chance of rain showers in the afternoon. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.
.FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming north 15 to
25 kt. Chance of rain showers in the evening. Waves 1 to 3 ft
building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...North winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.SATURDAY NIGHT...North winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SUNDAY...North winds 5 to 10 kt backing to south 10 to 15 kt.
Waves 1 to 3 ft.
.MONDAY...South winds 15 to 25 kt increasing to 30 kt. Waves 4 to
6 ft occasionally to 8 ft building to 4 to 7 ft occasionally to
9 ft.

$$

LMZ761-260800-
MAFOR 2603/
MICHIGAN NORTH 11900 11500 11510 12520 12420 11630. Chance of
rain Thursday evening. Waves 2 to 4 ft subsiding to 1 to 2 ft
tonight...building to 2 to 4 ft Thursday. Waves 3 to 5 ft
Thursday evening.

MICHIGAN SOUTH 11820 11800 11500 12510 13420. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft tonight. Waves 1 to
3 ft Thursday. Waves 2 to 4 ft Thursday 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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