Great Lakes Forecast
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FZUS63 KLOT 090854
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
254 AM CST Sat Dec 9 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 central Lake
Michigan early this morning will move slowly off to the east
today, reaching the eastern Lakes by evening. High pressure
ridging averaging 30.1 inches will move across the mid-Mississippi
Valley tonight, before another trough of low pressure of 30.0
inches reaches the western Lakes Sunday afternoon. Deeper low
pressure of 29.7 inches will dig southeast across the upper
Midwest and western Lakes Monday, and will deepen to 29.5 inches
as it continues to the eastern Lakes Monday night into early
Tuesday. High pressure of 30.1 inches will spread across the
western Lakes by early Wednesday.

LMZ261-362-364-563-091645-
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 Rock Island Passage to Sturgeon Bay WI-
254 AM CST Sat Dec 9 2017

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.TODAY...Northeast winds 15 to 25 kt increasing to 30 kt early
this morning and becoming north. Chance of snow this
morning...then slight chance of snow this afternoon. Waves 3 to
5 ft early building to 6 to 9 ft occasionally to 12 ft.
.TONIGHT...Northwest winds to 30 kt diminishing to 10 to 20 kt
late in the evening...then becoming west 15 to 25 kt after
midnight. Chance of snow overnight. Waves 4 to 7 ft occasionally
to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of snow showers. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt veering to northwest 15 to
25 kt. Snow showers likely. Waves 1 to 3 ft building to 2 to
4 ft.
.MONDAY NIGHT...North gales to 35 kt increasing to gales to
40 kt. Chance of snow showers. Waves 6 to 9 ft occasionally to
12 ft building to 8 to 11 ft occasionally to 14 ft.
.TUESDAY...North gales to 35 kt diminishing to 30 kt. Freezing
spray. Chance of snow showers. Waves 7 to 10 ft occasionally to
13 ft subsiding to 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west 5 to 10 kt
in the afternoon. Chance of snow showers. Waves 2 to 4 ft
subsiding to 1 to 2 ft.

$$

LMZ366-565-567-669-868-870-091645-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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 Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
254 AM CST Sat Dec 9 2017

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI...

...GALE WARNING IN EFFECT FROM 6 AM CST THIS MORNING THROUGH THIS
AFTERNOON...

.TODAY...North winds 15 to 25 kt increasing to north gales to 45
kt this morning...then easing to gales to 40 kt late. Snow likely
this morning...then chance of snow this afternoon. Waves 3 to 5
ft early building to 10 to 14 ft occasionally to 18 ft.
.TONIGHT...Northwest winds to 30 kt becoming west 15 to 25 kt.
Chance of snow in the evening...then slight chance of snow
overnight. Waves 8 to 11 ft occasionally to 14 ft subsiding to
4 to 7 ft occasionally to 9 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Chance of snow showers overnight. Waves 2 to 4 ft
subsiding to 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming west 15 to 25 kt...
then becoming northwest to 30 kt late. Snow showers likely. Waves
3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.MONDAY NIGHT...Northwest gales to 40 kt. Chance of snow showers.
Waves 7 to 10 ft occasionally to 13 ft building to 10 to 14 ft
occasionally to 18 ft.
.TUESDAY...Northwest gales to 40 kt diminishing to 30 kt in the
afternoon. Freezing spray. Chance of snow showers. Waves 10 to
14 ft occasionally to 18 ft subsiding to 7 to 10 ft occasionally
to 13 ft.
.WEDNESDAY...West winds 10 to 20 kt becoming southwest 10 to
15 kt. Chance of snow showers. Waves 2 to 4 ft subsiding to 1 to
3 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-091645-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
254 AM CST Sat Dec 9 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

...GALE WARNING IN EFFECT FROM 6 AM CST THIS MORNING THROUGH THIS
EVENING...

.TODAY...Southwest winds 15 to 25 kt early...veering northwest and
increasing to gales to 35 kt this morning...then becoming north
gales to 45 kt by midday. Snow likely this morning...then chance
of snow this afternoon. Waves 3 to 5 ft early building to 14 to
18 ft occasionally to 23 ft.
.TONIGHT...Northwest gales to 35 kt diminishing to 15 to 25 kt
late in the evening...then becoming west 10 to 20 kt overnight.
Chance of snow in the evening...then slight chance of snow
overnight. Waves 12 to 16 ft occasionally to 21 ft subsiding to
4 to 7 ft occasionally to 9 ft.
.SUNDAY...West winds 15 to 25 kt becoming northwest 10 to 20 kt.
Chance of snow showers in the afternoon. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west. Chance
of snow showers overnight. Waves 2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming west 15 to 25 kt.
Chance of snow showers in the morning...then chance of snow and
rain showers in the afternoon. Waves 3 to 5 ft.
.MONDAY NIGHT...Northwest gales to 40 kt. Chance of snow showers.
Waves 7 to 10 ft occasionally to 13 ft building to 10 to 14 ft
occasionally to 18 ft.
.TUESDAY...Northwest gales to 40 kt diminishing to 30 kt in the
afternoon. Chance of snow showers. Waves 10 to 14 ft occasionally
to 18 ft subsiding to 8 to 12 ft occasionally to 16 ft.
.WEDNESDAY...West winds 10 to 20 kt becoming southwest. Chance of
snow showers. Waves 3 to 5 ft subsiding to 2 to 4 ft.

$$

LMZ761-091645-
MAFOR 0910/
MICHIGAN NORTH...Gale Warning in effect...10137 11147 11857 12850
11840 11730 11720 11630. Chance of snow and snow showers. Waves
3 to 5 feet building to 10 to 14 feet occasionally to 18 feet
today. Waves 8 to 11 feet occasionally to 14 feet subsiding to 4
to 7 feet occasionally to 9 feet tonight.

MICHIGAN SOUTH...Gale Warning in effect...10537 11647 11757 12860
11760 11740 11730 11620. Chance of snow this afternoon and
evening. Waves 3 to 5 feet building to 14 to 18 feet occasionally
to 23 feet today. Waves 12 to 16 feet occasionally to 21 feet
subsiding to 4 to 7 feet occasionally to 9 feet tonight.

$$

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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