Great Lakes Forecast
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195
FZUS63 KLOT 152047
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
247 PM CST Fri Dec 15 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...Low pressure of 29.7 inches over Georgian Bay will
move east across the eastern Great Lakes tonight before merging
with a stronger low off Nova Scotia Saturday afternoon. A narrow
ridge of high pressure averaging 30.1 inches will move across the
lake tonight. Meanwhile, low pressure of 29.5 inches over
Saskatchewan will weaken to 29.9 inches as it moves southeast to
Iowa Saturday and dissipates. A weak pressure pattern will persist
over the region this weekend while high pressure of 30.3 inches
sits off the east coast and a strong 29.0 inch low tracks east
across northern Canada.

LMZ261-362-364-366-563-565-567-868-160430-
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-
247 PM CST Fri Dec 15 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds 10 to 20 kt becoming north. Slight
chance of snow. Waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.SATURDAY...Northeast winds 10 to 15 kt becoming east 10 to
20 kt. Chance of snow in the morning...then slight chance of snow
in the afternoon. Waves 2 to 4 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Waves 3 to 5 ft.
.SUNDAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming west 10 to
15 kt. Waves 2 to 4 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 1 to 3 ft building to 3 to 5 ft.
.MONDAY NIGHT...Southwest gales to 35 kt becoming west gales to
40 kt. Chance of snow. Waves 6 to 9 ft occasionally to 12 ft
building to 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West gales to 40 kt. Chance of rain and snow. Waves
8 to 11 ft occasionally to 14 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming west 10 to 20 kt
in the afternoon. Chance of snow. Waves 4 to 7 ft occasionally to
9 ft subsiding to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-160430-
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-
247 PM CST Fri Dec 15 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of snow this evening...then snow likely overnight. Waves
6 to 9 ft occasionally to 12 ft subsiding to 3 to 5 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Chance of snow in the
morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds 15 to 25 kt diminishing to
10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt becoming west. Waves
2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Southwest winds to 30 kt becoming west gales to
35 kt. Waves 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West gales to 40 kt. Waves 8 to 11 ft occasionally to
14 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to
5 ft.

$$

LMZ761-160430-
MAFOR 1522/
MICHIGAN NORTH 11730 13720 11810 11110 12220. Scattered snow
showers early this evening. Chance of snow after midnight. Chance
of snow Saturday morning. Waves 4 to 6 feet occasionally to 8
feet subsiding to 2 to 4 feet tonight. Waves 2 to 4 feet Saturday.


MICHIGAN SOUTH 11640 12630 11627 11520 13320. Scattered snow
this evening. Chance of snow Saturday morning. Waves 6 to 9 feet
occasionally to 12 feet subsiding to 3 to 5 feet tonight. Waves
3 to 5 feet Saturday.

$$

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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