Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 171515
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
915 AM CST Sun Dec 17 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 over southeast Ontario
will move east off into the northwestern Atlantic by Monday
morning. Meanwhile, low pressure of 29.2 inches over Northwest
Territories will deepen slightly to 29.1 inches as it moves to
Hudson Bay Monday night, then continues east to Quebec Tuesday. A
cold front trailing southwest from this low will move across the
lake Tuesday morning. High pressure of 30.3 inches over the
Northern Plains Tuesday afternoon will move east into the western
Great Lakes Wednesday. New low pressure of 29.6 inches will
develop over the central and southern High Plains Wednesday night
with a warm front developing northeast from that low northeast to
Lake Michigan.

LMZ261-362-364-366-563-565-172215-
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-
915 AM CST Sun Dec 17 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...Southeast winds 10 to 20 kt. Waves 1 to 3 ft.
.TONIGHT...South winds 10 to 15 kt veering to west 10 to 20 kt.
Slight chance of snow showers in the evening. Waves 1 to 3 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest to 30 kt.
Waves 1 to 3 ft building to 5 to 8 ft occasionally to 10 ft.
.MONDAY NIGHT...Southwest gales to 35 kt. Chance of rain and snow
showers in the evening. Waves 8 to 11 ft occasionally to 14 ft.
.TUESDAY...West winds to 30 kt increasing to gales to 35 kt.
Chance of snow showers in the afternoon. Waves 6 to 9 ft
occasionally to 12 ft.
.TUESDAY NIGHT...Northwest gales to 35 kt diminishing to 30 kt.
Chance of snow showers. Waves 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.THURSDAY...Southeast winds 10 to 20 kt becoming east. Snow and
rain. Waves 2 to 4 ft.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-172215-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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 Pentwater to Manistee MI 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-
915 AM CST Sun Dec 17 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.REST OF TODAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft
subsiding to 1 to 3 ft.
.TONIGHT...South winds 10 to 20 kt veering to west 10 to 15 kt.
Occasional drizzle and patchy fog. Waves 1 to 3 ft.
.MONDAY...West winds 10 to 15 kt becoming southwest to 30 kt.
Patchy fog in the morning. Waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft.
.MONDAY NIGHT...Southwest winds to 30 kt with a few gale force
gusts to 35 kt possible. Waves 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West winds to 30 kt increasing to gales to 35 kt.
Waves 6 to 9 ft occasionally to 12 ft.
.TUESDAY NIGHT...Northwest gales to 35 kt diminishing to 30 kt.
Waves 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming north 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.THURSDAY...South winds 10 to 20 kt becoming southeast. Chance of
rain and snow. Waves 2 to 4 ft.

$$
LMZ761-172215-
MAFOR 1716/
MICHIGAN NORTH 13320 11410 11510 12610 11520. Waves 2 to 4 feet
today. Waves 1 to 3 feet tonight. Waves 2 to 4 feet Monday
morning.

MICHIGAN SOUTH 12320 11425 11525 11615 13610. Waves 3 to 5 feet
subsiding to 2 to 4 feet today. Waves 2 to 4 feet tonight. Waves 1
to 3 feet Monday morning.

$$

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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