Great Lakes Forecast
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138
FZUS63 KLOT 201345
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
845 AM CDT Fri Oct 20 2017

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 30.3 inches over the Ohio Valley
will shift east to the New England coast Saturday. Low pressure
of 29.2 inches over Montana will move to Manitoba Saturday then
lift to Nunavut Sunday deepening to 28.6 inches. A cold front will
sweep across Lake Michigan Sunday. A trough averaging 29.6 inches
will then move across the lake on Monday.

LMZ261-362-364-366-563-565-567-868-202115-
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-
845 AM CDT Fri Oct 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 20 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.TONIGHT...South winds 20 to 25 kt increasing to 30 kt late.
Waves building to 5 to 8 ft occasionally to 10 ft.
.SATURDAY...South winds to 30 kt. Waves building to 6 to 9 ft
occasionally to 12 ft.
.SATURDAY NIGHT...South winds to 30 kt. Chance of showers
overnight. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...South winds to 30 kt becoming southwest 15 to 25 kt.
Chance of showers in the morning...then showers in the afternoon.
Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY NIGHT...West winds 10 to 20 kt. Chance of showers. Waves
4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.TUESDAY...North winds 15 to 25 kt becoming northwest to 30 kt.
Showers likely. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-202115-
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-
845 AM CDT Fri Oct 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 15 to 20 kt. Waves 3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt increasing to 15 to 25 kt by
late evening. Waves building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...South winds to 30 kt. Waves 5 to 8 ft occasionally to
10 ft.
.SATURDAY NIGHT...South winds to 30 kt. Chance of showers
overnight. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...South winds to 30 kt becoming southwest. Chance of
showers in the morning...then showers in the afternoon. Waves
6 to 9 ft occasionally to 12 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west. Chance
of showers. Waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.TUESDAY...Northwest winds to 30 kt diminishing to 15 to 25 kt.
Chance of showers. Waves 3 to 5 ft.

$$
LMZ761-202115-
MAFOR 2015/
MICHIGAN NORTH 15430 12440. Waves 4 to 7 ft occasionally to 9 ft
today building to 5 to 8 ft occasionally to 10 ft this evening,
further building to 6 to 9 ft occasionally to 12 ft Saturday
morning.

MICHIGAN SOUTH 14420 13430 11440. Waves 3 to 5 ft today building
to 4 to 6 ft occasionally to 8 ft tonight, further building to 5
to 8 ft occasionally to 10 ft Saturday morning.

$$

MTF

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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