Great Lakes Forecast
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FZUS63 KLOT 230746
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
246 AM CDT Mon Apr 23 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 30.4 inches is centered over New
England with ridging extending west across the Great Lakes. Low
pressure of 29.7 inches is over western Tennessee and will meander
over the area through Tuesday then shift to the mid Atlantic Coast
by early Wednesday. A cold front will move across Lake Michigan
Tuesday night. Another 30.4 inch high will build across the
Central Plains Tuesday night with a ridge extending into the
western Great Lakes, which will shift to the Ohio Valley Thursday.
Low pressure of 29.5 inches will move from Hudson Bay Wednesday
night to northern Quebec Thursday night as a trailing cold front
pushes across Lake Michigan.

LMZ261-362-364-366-563-565-567-868-231530-
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-
246 AM CDT Mon Apr 23 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Variable winds around 10 kt becoming northeast 10 to 15
early this afternoon then 10 to 20 kt late. Waves 1 to 2 ft
building to 1 to 3 ft.
.TONIGHT...Northeast winds 10 to 20 kt diminishing to 5 to 10 kt
and becoming variable. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.TUESDAY...Northeast winds 5 to 10 kt becoming north early in the
afternoon, then becoming 10 to 20 kt late. Waves 1 to 2 ft.
.TUESDAY NIGHT...North winds to 30 kt. Waves 4 to 6 ft
occasionally to 8 ft building to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...North winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...North winds 10 to 15 kt backing to west 5 to
10 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...North winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-231530-
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-
246 AM CDT Mon Apr 23 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.TONIGHT...Northeast winds 10 to 20 kt becoming east 10 to 15 kt.
Slight chance of rain showers overnight. Waves 1 to 3 ft.
.TUESDAY...Northeast winds 5 to 10 kt becoming north 10 to 15 kt.
Chance of rain showers in the morning. Waves 1 to 2 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt increasing to 30 kt.
Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...North winds to 30 kt diminishing to 15 to 25 kt.
Waves 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming northwest
5 to 10 kt overnight. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.THURSDAY...Southwest winds 10 to 20 kt becoming south. Waves
1 to 3 ft.
.FRIDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ761-231530-
MAFOR 2309/
MICHIGAN NORTH 13910 11110 12120 11110 11900. Waves 1 to 3 ft.

MICHIGAN SOUTH 11110 14120 11120 12210. Waves 2 to 4 ft today.
Waves 1 to 3 ft tonight.

$$

BMD

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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