Great Lakes Forecast
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000
FZUS63 KLOT 092027
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
227 PM 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 southern Lower
Michigan will move slowly off to the east, reaching the eastern
Lakes this evening. High pressure ridging averaging 30.1 inches
will move across the Middle 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.

LMZ261-362-364-563-100415-
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-
227 PM CST Sat Dec 9 2017

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.TONIGHT...Northwest winds to 30 kt diminishing to 10 to 20 kt
late this evening...then becoming west 15 to 25 kt overnight.
Slight chance of snow showers this evening...then chance of snow
showers overnight. Waves 4 to 7 ft occasionally to 9 ft subsiding
to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...West winds 15 to 25 kt becoming northwest. Chance of
snow showers. Waves 4 to 6 ft occasionally to 8 ft subsiding to
3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt late in the evening...then diminishing to 10 to 15 kt after
midnight becoming west late. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming west 15 to 25 kt.
Snow showers likely. Waves 1 to 3 ft building to 3 to 5 ft.
.MONDAY NIGHT...Northwest gales to 45 kt becoming north. Freezing
spray. Chance of snow showers. Waves 7 to 10 ft occasionally to
13 ft building to 8 to 12 ft occasionally to 16 ft.
.TUESDAY...North gales to 40 kt diminishing to 30 kt in the
afternoon. Freezing spray in the morning. Chance of snow showers.
Waves 8 to 12 ft occasionally to 16 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.TUESDAY NIGHT...North winds to 30 kt diminishing to 15 to 25 kt.
Chance of snow showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Chance of snow showers. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.THURSDAY...West winds 10 to 20 kt becoming northwest to 30 kt in
the afternoon. Chance of snow showers. Waves 2 to 4 ft building
to 4 to 6 ft occasionally to 8 ft.

$$

LMZ366-565-567-669-868-870-100415-
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-
227 PM CST Sat Dec 9 2017

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

...GALE WARNING IN EFFECT UNTIL 6 PM CST THIS EVENING...

.TONIGHT...Northwest winds to 30 kt becoming west 15 to 25 kt.
Slight chance of snow showers. Waves 8 to 11 ft occasionally to
14 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Slight
chance of snow showers. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt late in the evening...then diminishing to 10 to 15 kt after
midnight becoming west late. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming west. Snow showers
likely in the morning...then chance of snow showers in the
afternoon. Waves 3 to 5 ft.
.MONDAY NIGHT...Northwest gales to 45 kt. Freezing spray. Chance
of snow showers. Waves 8 to 11 ft occasionally to 14 ft building
to 12 to 16 ft occasionally to 21 ft.
.TUESDAY...Northwest gales to 40 kt diminishing to gales to
35 kt. Freezing spray in the morning. Chance of snow showers.
Waves 12 to 16 ft occasionally to 21 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. Chance of snow
showers. Waves 7 to 10 ft occasionally to 13 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west. Waves
4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY...West winds 15 to 25 kt becoming northwest to 30 kt.
Chance of snow showers. Waves 3 to 5 ft building to 4 to 7 ft
occasionally to 9 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-100415-
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-
227 PM CST Sat Dec 9 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

...GALE WARNING IN EFFECT UNTIL 9 PM CST THIS EVENING...

.TONIGHT...Northwest gales to 40 kt diminishing to 15 to 25 kt
late this evening...then becoming west 10 to 20 kt overnight.
Chance of snow showers this evening...then slight chance of snow
showers overnight. Waves 14 to 18 ft occasionally to 23 ft
subsiding to 4 to 7 ft occasionally to 9 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Slight
chance of snow showers in the morning...then 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 15 to 25 kt diminishing to 10 to
20 kt late in the evening...then diminishing to 10 to 15 kt after
midnight becoming west 10 to 20 kt late. Chance of snow showers
overnight. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming west. Snow showers
likely. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Northwest gales to 45 kt. Chance of snow showers.
Waves 8 to 11 ft occasionally to 14 ft building to 12 to 16 ft
occasionally to 21 ft.
.TUESDAY...Northwest gales to 40 kt diminishing to gales to
35 kt. Chance of snow showers. Waves 12 to 16 ft occasionally to
21 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. Chance of snow
showers. Waves 8 to 12 ft occasionally to 16 ft subsiding to 6 to
9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west. Chance of
snow showers. Waves 4 to 7 ft occasionally to 9 ft subsiding to
3 to 5 ft.
.THURSDAY...West winds 15 to 25 kt becoming northwest to 30 kt.
Chance of snow showers. Waves 3 to 5 ft building to 5 to 8 ft
occasionally to 10 ft.

$$

LMZ761-100415-
MAFOR 0922/
MICHIGAN NORTH...Gale Warning in effect...11850 11740 11720 13630
12730. Chance of snow early this evening. Chance of snow showers
after midnight tonight. Chance of snow showers Sunday. Waves 8 to
11 feet occasionally to 14 feet subsiding to 4 to 7 feet
occasionally to 9 feet tonight. Waves 4 to 6 feet occasionally to
8 feet subsiding to 3 to 5 feet Sunday.

MICHIGAN SOUTH...Gale Warning in effect...11760 11750 11740 11630
14620. Chance of snow showers this evening. Waves 14 to 18 feet
occasionally to 23 feet subsiding to 4 to 7 feet occasionally to 9
feet tonight. Waves 4 to 6 feet occasionally to 8 feet subsiding
to 3 to 5 feet Sunday.

$$

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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