Great Lakes Forecast
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643
FZUS63 KLOT 201434
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
834 AM CST Mon Nov 20 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 averaging 30.2 inches is centered
across the southeastern states today. Low pressure of 29.2 inches
will move from southern Saskatchewan this morning to Quebec late
Tuesday. Broad high pressure of 30.4 inches will build across the
central and northern Great Plains Tuesday and gradually shift to
the lower Mississippi Valley Thursday.

LMZ261-362-364-366-563-565-567-868-202230-
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-
834 AM CST Mon Nov 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WARNING IN EFFECT FROM 3 PM CST THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southwest winds 15 to 25 kt becoming south gales
to 35 kt. Waves 4 to 6 ft occasionally to 8 ft building to 5 to
8 ft occasionally to 10 ft.
.TONIGHT...Southwest gales to 40 kt. Waves building to 10 to 14
ft occasionally to 18 ft.
.TUESDAY...West gales to 35 kt becoming northwest winds to 30 kt.
Chance of snow in the afternoon. Waves 8 to 12 ft occasionally to
16 ft subsiding to 6 to 9 ft occasionally to 12 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. 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. Waves 3
to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...West winds 15 to 25 kt increasing to 30 kt.
Waves 3 to 5 ft.
.THURSDAY...West winds 15 to 25 kt. Waves 3 to 5 ft.
.FRIDAY...South gales to 35 kt becoming southwest gales to 40 kt.
Chance of rain. Waves building to 8 to 11 ft occasionally to 14
ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-202230-
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-
834 AM CST Mon Nov 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WARNING IN EFFECT FROM 3 PM CST THIS AFTERNOON THROUGH
TUESDAY AFTERNOON...

.REST OF TODAY...Southwest winds to 30 kt increasing to gales to
40 kt. Waves 7 to 10 ft occasionally to 13 ft.
.TONIGHT...Southwest gales to 40 kt. Waves 10 to 14 ft
occasionally to 18 ft.
.TUESDAY...Southwest gales to 35 kt becoming northwest to 30 kt.
Waves 8 to 12 ft occasionally to 16 ft subsiding to 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 10 to 20 kt becoming west 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...West winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY...Southwest winds 15 to 25 kt becoming west. Waves 3
to 5 ft.
.FRIDAY...Southwest winds to 30 kt increasing to gales to 35
kt. Waves 4 to 6 ft occasionally to 8 ft building to 6 to 9 ft
occasionally to 12 ft.

$$
LMZ761-202230-
MAFOR 2016/
MICHIGAN NORTH...Gale Warning in effect...11530 11540 11450 14550
11650. Waves 4 to 6 feet occasionally to 8 feet building to 5 to
8 feet occasionally to 10 feet today. Waves 10 to 14 feet
occasionally to 18 feet tonight. Waves 8 to 11 feet occasionally
to 14 feet Tuesday morning.

MICHIGAN SOUTH...Gale Warning in effect...11540 15550 11650.
Waves 7 to 10 feet occasionally to 13 feet today. Waves 10 to 14
feet occasionally to 18 feet tonight. Waves 8 to 12 feet
occasionally to 16 feet Tuesday 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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