Great Lakes Forecast
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000
FZUS63 KLOT 180237
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
837 PM 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...Weak low pressure of 29.9 inches will cross the lake
tonight. Strong low pressure of 29.2 inches over the Northwest
Territories will deepen slightly to 29.0 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 toward Lake
Michigan. This low will cross lake Michigan Friday as a deepening
29.3 inch low.

LMZ261-362-364-366-563-565-180900-
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-
837 PM 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 TONIGHT...South winds 10 to 15 kt veering to west.
Slight chance of snow. Waves 1 to 3 ft.
.MONDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
2 to 4 ft building to 5 to 8 ft occasionally to 10 ft.
.MONDAY NIGHT...Southwest winds to 30 kt. A few gale force gusts
to 35 kt. Chance of rain and snow. Waves 7 to 10 ft occasionally
to 13 ft.
.TUESDAY...West winds to 30 kt. Waves 6 to 9 ft occasionally to
12 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. Waves 6 to 9 ft
occasionally to 12 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to 15
kt in the afternoon. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 1 to 3 ft in the afternoon.
.WEDNESDAY NIGHT...North winds 10 to 15 kt becoming east 10 to
20 kt. Chance of snow. Waves 1 to 3 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Chance of snow and rain
likely. Waves 2 to 4 ft.
.FRIDAY...East winds 15 to 25 kt. Snow and rain. Waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft in the afternoon.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-180900-
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-
837 PM CST Sun Dec 17 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 20 kt becoming west.
Areas of fog. Chance of rain and slight chance of snow. Waves 1
to 3 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest to 30 kt
from late morning on. Areas of fog in the morning. Slight
chance of rain 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. Waves 7 to 10 ft
occasionally to 13 ft.
.TUESDAY...West winds to 30 kt. Waves 6 to 9 ft occasionally to
12 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. Waves 6 to 9 ft
occasionally to 12 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 15 kt
in the afternoon. Waves 4 to 7 ft occasionally to 9 ft subsiding
to 3 to 5 ft in the afternoon.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
10 to 20 kt. Chance of snow. Waves 2 to 4 ft.
.THURSDAY...Southeast winds 15 to 25 kt. Chance of rain and snow.
Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest 15 to 25 kt.
Rain and snow likely. Waves 3 to 5 ft building to 4 to 7 ft
occasionally to 9 ft in the afternoon.

$$
LMZ761-180900-
MAFOR 1804/
MICHIGAN NORTH 11410 19510 12610 11520 11530 12540 11540 19550.
Chance of rain and snow Monday evening. Waves 1 to 3 ft tonight.
Waves 2 to 4 ft building to 5 to 8 ft occasionally to 10 ft
Monday. Waves 7 to 10 ft occasionally to 13 ft Monday evening.

MICHIGAN SOUTH 12520 19900 12620 12530 12540. Areas of fog
tonight and Monday morning. Chance of rain tonight. Waves 1 to
3 ft tonight. Waves 1 to 3 ft building to 4 to 6 ft occasionally
to 8 ft Monday. Waves 7 to 10 ft occasionally to 13 ft Monday
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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