Great Lakes Forecast
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575
FZUS63 KLOT 160233
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
833 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 29.6 inches near Georgian Bay will
move into southern Quebec tonight...then merge 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.

LMZ261-362-364-366-563-565-567-868-160900-
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 CST Fri Dec 15 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Northwest winds 15 to 25 kt becoming north
10 to 20 kt. Chance of snow. Waves 4 to 6 ft occasionally to 8
ft subsiding to 3 to 5 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-160900-
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 CST Fri Dec 15 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...West winds to 30 kt diminishing to 15 to 25
kt after midnight...then becoming northwest 10 to 20 kt toward
morning. Snow likely. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to 25
kt in the afternoon. 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.

$$
LMZ761-160900-
MAFOR 1604/
MICHIGAN NORTH 11730 11720 11820 11110 14220. Chance of snow
tonight and Saturday morning. Waves 4 to 6 ft occasionally to
8 ft subsiding to 3 to 5 ft tonight. Waves 2 to 4 ft Saturday.
Waves 3 to 5 ft Saturday evening.

MICHIGAN SOUTH 11647 11637 11727 19520 12220 19420 13330.
Chance of snow Saturday morning. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 3 to 5 ft tonight. Waves 3 to 5 ft Saturday
and Saturday evening.

$$

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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