Great Lakes Forecast
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FZUS63 KLOT 210133
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
833 PM 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 to the New England coast Saturday. Meanwhile low
pressure of 29.2 inches over Montana will move to Manitoba
Saturday, and then near Hudson Bay 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.

LMZ261-362-364-366-563-565-567-868-211030-
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-
833 PM CDT Fri Oct 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 15 to 25 kt. A few gusts to 30 kt
late. Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.SATURDAY...South winds to 30 kt. Occasional gales to 35 kt late.
Waves building to 7 to 10 ft occasionally to 13 ft.
.SATURDAY NIGHT...South winds to 30 kt. Occasional gales to 35
kt. Waves 8 to 11 ft occasionally to 14 ft.
.SUNDAY...South winds to 30 kt becoming west. Chance of showers
in the morning...then showers in the afternoon. Waves 8 to 11 ft
occasionally to 14 ft subsiding to 7 to 10 ft occasionally to
13 ft.
.SUNDAY NIGHT...West winds 10 to 20 kt becoming southwest. Chance
of showers in the evening. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY NIGHT...West winds 15 to 25 kt becoming north to 30 kt.
Chance of showers. Waves 2 to 4 ft building to 4 to 6 ft
occasionally to 8 ft.
.TUESDAY...North gales to 40 kt. Showers likely. Waves 7 to 10 ft
occasionally to 13 ft building to 8 to 12 ft occasionally to
16 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming west 10 to 20 kt
in the afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211030-
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-
833 PM CDT Fri Oct 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY...South winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally
to 12 ft.
.SATURDAY NIGHT...South winds to 30 kt. Occasional gales to 35
kt. Waves 7 to 10 ft occasionally to 13 ft.
.SUNDAY...South winds to 30 kt veering to west. Chance of showers
in the morning...then showers in the afternoon. Waves 7 to 10 ft
occasionally to 13 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of showers. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.
.MONDAY NIGHT...Northwest winds to 30 kt becoming north. Chance
of showers. Waves 2 to 4 ft building to 4 to 7 ft occasionally to
9 ft.
.TUESDAY...Northwest gales to 40 kt. Showers likely. Waves 7 to
10 ft occasionally to 13 ft building to 10 to 14 ft occasionally
to 18 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming west 10 to 20 kt
in the afternoon. Waves 7 to 10 ft occasionally to 13 ft
subsiding to 4 to 6 ft occasionally to 8 ft.

$$
LMZ761-211030-
MAFOR 2103/
MICHIGAN NORTH 12430 14440 12440 19450. Waves 4 to 7 feet
occasionally to 9 feet building to 5 to 8 ft occasionally to 10 ft
overnight. Waves building to 7 to 10 feet occasionally to 13 feet
Saturday. Waves 8 to 11 feet occasionally to 14 feet Saturday
evening.

MICHIGAN SOUTH 12420 12430 13440 11440 19450. Waves 4 to 6 feet
occasionally to 8 feet overnight. Waves 4 to 7 feet occasionally
to 9 feet building to 6 to 9 feet occasionally to 12 feet
Saturday. Waves 7 to 10 feet occasionally to 13 feet Saturday
evening.

$$


JEE

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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