Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
120
FZUS63 KLOT 100251
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
851 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 29.8 inches over southern Quebec will
move east and merge with a strong low off the New England coast
tonight. 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.

LMZ261-362-364-366-563-565-567-868-101030-
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-
851 PM CST Sat Dec 9 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Northwest winds 10 to 20 kt becoming west
15 to 25 kt. Chance of snow showers. Waves 4 to 6 ft occasionally
to 8 ft.
.SUNDAY...West winds 15 to 25 kt becoming northwest. Scattered
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 3 to 5 ft.
.MONDAY NIGHT...Northwest gales to 45 kt becoming north. Freezing
spray. Chance of snow showers. Waves 8 to 11 ft occasionally to
14 ft building to 10 to 14 ft occasionally to 18 ft.
.TUESDAY...North gales to 40 kt diminishing to gales to 35 kt.
Freezing spray in the morning. Chance of snow showers. Waves
10 to 14 ft occasionally to 18 ft subsiding to 8 to 11 ft
occasionally to 14 ft.
.TUESDAY NIGHT...North winds to 30 kt. Chance of snow showers.
Waves 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west. Chance of
snow showers. 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-101030-
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-
851 PM CST Sat Dec 9 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northwest winds to 30 kt becoming west 15 to
20 kt overnight. Snow showers ending. Waves v
.SUNDAY...West winds 15 to 25 kt becoming northwest 10 to 20 kt.
Slight chance of snow showers. Waves 4 to 6 ft occasionally to
8 ft subsiding to 3 to 5 ft.
.SUNDAY NIGHT...Northwest 10 to 20 kt Scattered 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.
Freezing spray overnight. 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 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.

$$

LMZ761-101030-
MAFOR 1004/
MICHIGAN NORTH 11720 11620 13630 13730. Scattered snow showers.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft Sunday
afternoon.

MICHIGAN SOUTH 11740 14630 13720. Scattered snow showers. Waves
10 to 14 ft occasionally to 18 ft subsiding to 4 to 7 ft
occasionally to 9 ft.

$$

- Izzi

Experimental modernized open lake forecast is available online at
weather.gov/lot/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.