Great Lakes Forecast
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FZUS63 KMKX 241347
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
847 AM CDT Sat Oct 24 2020

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 continues to build eastward into the
Great Lake region today, keeping winds light and from the west
and north. As high pressure of 30.7 inches drops along the front
range of the central Rockies late this weekend into early next
week, Lake Michigan will remain on the eastern fringe of surface
ridging. Tuesday into Wednesday, a surface low tracks east across
central Canada towards the Hudson Bay and brings an enhanced
pressure gradient across the western Great Lakes, and especially
northern parts of Lake Michigan.

&&

LMZ261-362-364-366-563-565-567-669-868-870-242130-
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 Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
847 AM CDT Sat Oct 24 2020

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

.REST OF TODAY...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TONIGHT...Northwest winds 5 to 10 kt becoming north 10 to 15 kt.
Slight chance of rain. Waves 1 to 2 ft.
.SUNDAY...North winds 10 to 15 kt becoming northeast. Rain
showers likely in the afternoon. Waves 1 to 2 ft.
.SUNDAY NIGHT...North winds 10 to 15 kt increasing to 10 to
20 kt. Rain showers likely in the evening, then chance of rain
showers overnight. Waves 1 to 3 ft.
.MONDAY...North winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.
.MONDAY NIGHT...North winds 10 to 15 kt. Waves 2 to 4 ft.
.TUESDAY...West winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.WEDNESDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-242130-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
847 AM CDT Sat Oct 24 2020

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TODAY...North winds 10 to 20 kt diminishing to 5 to
10 kt. Chance of rain through mid morning. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.
.TONIGHT...North winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 to 3 ft.
.SUNDAY...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...Northeast winds 10 to 20 kt becoming north.
Chance of rain showers. Waves 2 to 4 ft.
.MONDAY...North winds 10 to 20 kt. Chance of rain showers. Waves
2 to 4 ft.
.MONDAY NIGHT...North winds 10 to 15 kt. Chance of rain showers.
Waves 2 to 4 ft.
.TUESDAY...Northwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 3 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt. Waves 3 to 5 ft.

$$

LMZ761-242130-
MAFOR 2415/

MICHIGAN NORTH 12610 11710 11700 11810 11800 12810. Chance of
rain late this morning. Waves 1 to 3 feet this afternoon. Waves 2
feet or less tonight and Sunday morning.

MICHIGAN SOUTH 11710 11810 11800 12810 12110 11210. Chance of
rain late this morning. Waves 2 to 4 feet subsiding to 1 to 3
feet this afternoon. Waves 1 to 2 feet tonight and Sunday
morning.

$$


Ritzman

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes



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