Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 211508
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
908 AM CST Wed Feb 21 2018

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 29.9 inches is over northern
Quebec this morning with a cold front trailing across the eastern
Great Lakes to the lower Mississippi Valley. The low will move to
the Canadian Maritimes today while the cold front shifts east to
the Atlantic Coast. Meanwhile, high pressure of 30.7 inches
centered over the Upper Missouri Valley this morning will shift
to Lake Superior late tonight and then move to Maine late
Thursday night. A low of 30.1 inches will move from the mid
Mississippi Valley early Friday to the eastern Great Lakes late
Friday. Another high of 30.3 inches will build across the Dakotas
Friday and lift to Quebec Saturday. Low pressure of 29.7 inches
will develop over the Central Plains Friday night and lift across
Lake Superior Sunday at 29.1 inches.

LMZ261-362-364-366-563-565-567-868-212230-
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-
908 AM CST Wed Feb 21 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.TONIGHT...West winds around 10 kt veering to northeast 10 to 15
kt. Waves 1 to 3 ft.
.THURSDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Chance of snow, light sleet likely with a chance of light
freezing rain overnight. Waves 2 to 4 ft building to 3 to 5 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest. Snow, rain,
light freezing rain and light sleet likely in the morning. Waves
3 to 5 ft subsiding to 1 to 3 ft.
.FRIDAY NIGHT...West winds 10 to 20 kt becoming northwest 10 to
15 kt. Waves 1 to 3 ft.
.SATURDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft building to 2 to 4 ft.
.SUNDAY...West winds to 30 kt. Chance of rain and snow. Waves
6 to 9 ft occasionally to 12 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-212230-
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-
908 AM CST Wed Feb 21 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...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.
.TONIGHT...Northeast winds 10 to 20 kt. Waves subsiding to 3 to 5
ft.
.THURSDAY...East winds 15 to 20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...East winds 15 to 25 kt becoming southeast.
Chance of rain and light freezing rain overnight. Waves 3 to
5 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest 10 to 15 kt.
Rain likely in the morning. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.FRIDAY NIGHT...West winds 10 to 15 kt veering to north. Waves
1 to 2 ft.
.SATURDAY...East winds 10 to 20 kt. Chance of rain and light
freezing rain. Waves 1 to 3 ft building to 2 to 4 ft.
.SUNDAY...West gales to 35 kt. Chance of rain and snow. Waves
6 to 9 ft occasionally to 12 ft.

$$
LMZ761-212230-
MAFOR 2116/
MICHIGAN NORTH 11720 13610 11810 11110 12210. Waves 3 to 5 ft
subsiding to 2 to 4 ft today. Waves 1 to 3 ft tonight and
Thursday morning.

MICHIGAN SOUTH 11730 13820 13120 11220. Waves 4 to 7 ft
occasionally to 9 ft today subsiding to 3 to 5 ft today. Waves 3
to 5 ft tonight and Thursday 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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