Great Lakes Forecast
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000
FZUS63 KLOT 210740
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
240 AM CDT Sat Oct 21 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 30.4 inches is centered along the mid
Atlantic Coast. Low pressure of 29.2 inches is centered over
southern Manitoba. The low will lift to Hudson Bay Sunday as a
trailing cold front moves across Lake Michigan. Another low of
29.4 inches will move across Alberta Sunday to James Bay late
Monday as another cold front moves across Lake Michigan.
Meanwhile, low pressure of 29.6 inches will form over the upper
Ohio Valley Monday night and lift across Quebec Wednesday
deepening to 29.2 inches.

LMZ261-362-364-366-563-565-567-868-211515-
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-
240 AM CDT Sat Oct 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...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.
.TONIGHT...South winds to 30 kt. Slight chance of showers
overnight. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...South winds to 30 kt veering to west 15 to 25 kt.
Occasional gale force gusts to 35 kt possible through midday.
Chance of showers in the morning...then showers in the afternoon.
Waves 7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 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. Waves 3 to 5 ft.
.MONDAY NIGHT...West winds 10 to 20 kt becoming north to 30 kt
overnight. Chance of showers. Waves 2 to 4 ft building to 4 to
6 ft occasionally to 8 ft.
.TUESDAY...North gales to 40 kt. Rain showers likely. Waves 8 to
11 ft occasionally to 14 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. Chance of rain showers. Waves 6 to 9 ft
occasionally to 12 ft subsiding to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211515-
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-
240 AM CDT Sat Oct 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 15 to 25 kt. Waves 3 to 5 ft building to 5
to 8 ft occasionally to 10 ft.
.TONIGHT...South winds 15 to 25 kt increasing to 30 kt. Slight
chance of showers and thunderstorms overnight. Waves 5 to 8 ft
occasionally to 10 ft.
.SUNDAY...South winds to 30 kt veering to northwest 15 to 25 kt.
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 15 kt becoming west. Chance
of showers. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
1 to 3 ft.
.MONDAY NIGHT...Northwest winds 15 to 25 kt increasing to 30 kt.
Chance of showers. Waves 2 to 4 ft building to 4 to 7 ft
occasionally to 9 ft.
.TUESDAY...Northwest gales to 35 kt increasing to gales to 40 kt
in the afternoon. Showers likely. Waves 8 to 11 ft occasionally
to 14 ft building to 10 to 14 ft occasionally to 18 ft.
.WEDNESDAY...West winds to 30 kt. Chance of rain showers. Waves
7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 ft.

$$

LMZ761-211515-
MAFOR 2109/
MICHIGAN NORTH 12430 15440. Waves 4 to 7 feet occasionally to 9
feet building to 6 to 9 feet occasionally to 12 feet today. Waves
6 to 9 feet occasionally to 12 feet tonight.

MICHIGAN SOUTH 15430 12440. Waves 3 to 5 feet building to 5 to 8
feet occasionally to 10 feet today. Waves 5 to 8 feet
occasionally to 10 feet 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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