Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 220131
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
831 PM CDT Sat Apr 21 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 30.5 inches over the Great Lakes will
drift very slowly east to southern New England through Monday
morning, while weaker ridging averaging 30.5 inches lingers across
the Lakes. Farther south, low pressure of 29.8 inches will move
from Texas to the lower Mississippi Valley. The ridge across the
Lakes will slowly weaken Monday night into Tuesday, while another
low passes well north of the Lakes across James Bay. A cold front
trailing from this low will eventually move across Lake Michigan
Tuesday night, with strengthening north winds developing behind
it. Winds will diminish later Wednesday, as high pressure
averaging 30.1 inches moves into the western Lakes.

LMZ261-362-364-366-563-565-567-868-220930-
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-
831 PM CDT Sat Apr 21 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Variable winds less than 10 kt. Waves 1 ft or
less.
.SUNDAY...Light and variable becoming northeast 5 to 10 kt. Waves
1 ft or less.
.SUNDAY NIGHT...Northeast winds 5 to 10 kt veering to southeast.
Waves around 1 ft.
.MONDAY...Southeast winds 5 to 10 kt backing to northeast. Waves
1 to 2 ft.
.MONDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 to 2 ft.
.TUESDAY...North winds less than 10 kt becoming northwest 10 to
20 kt in the afternoon. Waves 1 to 2 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt. Waves 3 to 5 ft
building to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of rain showers.
Waves 2 to 4 ft building to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220930-
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-
831 PM CDT Sat Apr 21 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Light and variable winds. Waves nearly calm.
.SUNDAY...Northeast winds 5 to 10 kt increasing to 10 to 20 kt.
Waves building to 1 to 3 ft.
.SUNDAY NIGHT...Northeast winds 10 to 15 kt becoming east. Waves
1 to 3 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north. Waves 1 to
3 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming east. Waves
1 to 3 ft.
.TUESDAY...Northeast winds 5 to 10 kt becoming north. Waves 1 to
3 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt increasing to 30 kt.
Waves 3 to 5 ft building to 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 5 to 8 ft occasionally to 10 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.

$$
LMZ761-220930-
MAFOR 2203/
MICHIGAN NORTH 14900 11900 13100. Waves 1 ft or less.

MICHIGAN SOUTH 13900 11100 11110 12120 11110. Waves nearly calm
tonight building to 1 to 3 ft Sunday.

$$

- Izzi

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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