Great Lakes Forecast
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339
FZUS63 KLOT 212036
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
236 PM CST Tue Nov 21 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 29.2 inches near James Bay will move
to northern Quebec tonight as broad high pressure of 30.4 inches
builds across the central Great Plains tonight, and then gradually
shifts to the lower Mississippi Valley Wednesday and Wednesday
night. A trough of low pressure averaging 29.8 inches will move
across Ontario and the Great Lakes on Thursday, with a deeper low
pressure system of 28.9 inches quickly moving through Manitoba
and Ontario by early Friday.

LMZ261-362-364-366-563-565-567-868-220430-
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-
236 PM CST Tue Nov 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds to 30 kt. A few gale force gusts to 35
kt through early evening. Slight chance of snow showers. Waves 6
to 9 ft occasionally to 12 ft subsiding to 4 to 7 ft occasionally
to 9 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt backing to southwest.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt increasing to
30 kt. Chance of snow overnight. Waves 3 to 5 ft building to 4 to
7 ft occasionally to 9 ft.
.THURSDAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming southwest to
30 kt overnight. Waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft.
.FRIDAY...Southwest gales to 40 kt. Chance of rain in the
afternoon. Waves 8 to 11 ft occasionally to 14 ft building to
10 to 14 ft occasionally to 18 ft.
.FRIDAY NIGHT...Southwest gales to 40 kt becoming west gales to
35 kt. Chance of rain. Waves 10 to 14 ft occasionally to 18 ft
subsiding to 7 to 10 ft occasionally to 13 ft.
.SATURDAY...Northwest gales to 35 kt diminishing to 30 kt. Chance
of rain and snow. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220430-
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-
236 PM CST Tue Nov 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northwest winds to 30 kt diminishing to 15 to 25 kt. A
few gale force gusts to 35 kt through early evening. Waves 6 to 9
ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt backing to southwest.
Waves subsiding to 2 to 4 ft.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 kt increasing to
30 kt. Waves 1 to 3 ft building to 4 to 6 ft occasionally to
8 ft.
.THURSDAY...West winds to 30 kt diminishing to 10 to 20 kt in the
afternoon. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 2 to 4 ft.
.FRIDAY...South gales to 35 kt increasing to gales to 40 kt.
Waves 5 to 8 ft occasionally to 10 ft building to 7 to 10 ft
occasionally to 13 ft.
.FRIDAY NIGHT...Southwest gales to 40 kt becoming west gales to
35 kt. Chance of rain. Waves 7 to 10 ft occasionally to 13 ft
subsiding to 6 to 9 ft occasionally to 12 ft.
.SATURDAY...West gales to 35 kt becoming northwest to 30 kt.
Chance of rain. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 3 to 5 ft subsiding
to 2 to 4 ft.

$$

LMZ761-220430-
MAFOR 2122/
MICHIGAN NORTH 14740 11730 11720 11620 11520. Chance of snow
showers early this evening. Waves 6 to 9 feet occasionally to 12
feet subsiding to 4 to 7 feet occasionally to 9 feet tonight.
Waves 4 to 6 feet occasionally to 8 feet subsiding to 2 to 4 feet
Wednesday.

MICHIGAN SOUTH 13740 12730 11720 12620. Waves 6 to 9 feet
occasionally to 12 feet tonight. Waves subsiding to 2 to 4 feet
Wednesday.

$$


Rodriguez

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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